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  Subjects -> ENGINEERING (Total: 2284 journals)
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ENGINEERING (1208 journals)                  1 2 3 4 5 6 7 | Last

Showing 1 - 200 of 1205 Journals sorted alphabetically
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at - Automatisierungstechnik     Hybrid Journal   (Followers: 1)
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CFD Letters     Open Access   (Followers: 6)
Chaos : An Interdisciplinary Journal of Nonlinear Science     Hybrid Journal   (Followers: 2)
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        1 2 3 4 5 6 7 | Last

Journal Cover Corrosion Science
  [SJR: 1.931]   [H-I: 130]   [25 followers]  Follow
    
   Hybrid Journal Hybrid journal (It can contain Open Access articles)
   ISSN (Print) 0010-938X
   Published by Elsevier Homepage  [3042 journals]
  • IFC - Editorial Board
    • Abstract: Publication date: 15 August 2017
      Source:Corrosion Science, Volume 125


      PubDate: 2017-07-23T13:44:54Z
       
  • Applicability of ToF-SIMS and stable oxygen isotopes in KCl-induced
           corrosion studies at high temperatures
    • Abstract: Publication date: 15 August 2017
      Source:Corrosion Science, Volume 125
      Author(s): Juho Lehmusto, Mikael Bergelin, Jingxin Sui, Jyrki Juhanoja, Bengt-Johan Skrifvars, Patrik Yrjas
      The applicability of Time-of-Flight Secondary Ion Mass Spectrometry (ToF-SIMS) in combination with the use of stable oxygen isotopes (16O and 18O) in high-temperature corrosion research was addressed in this study. In terms of the corrosion reaction timescale, the focus was on the initiation of KCl-induced high-temperature corrosion and on the behaviour of three commercial alloys under conditions where multiple oxygen sources (air and water vapour) were present. ToF-SIMS proved to be an applicable tool in high-temperature corrosion studies, in this case, providing detailed information about the distribution of the two oxygen isotopes at the sample surfaces. Oxygen from air prefers to form a solid intermediate, potassium chromate (K2CrO4), when reacting with a chromia-forming alloy, whereas oxygen from both sources was found in the oxide formed at the alloy surface. Regardless of the prevailing conditions, the nickel-based austenitic alloy withstood corrosion the best, then the iron-based high alloy austenitic steel, whereas the low alloy ferritic steel had the poorest corrosion resistance ability.

      PubDate: 2017-07-23T13:44:54Z
       
  • Strain-induced reactivation of corrosion pits in austenitic stainless
           steel
    • Abstract: Publication date: 15 August 2017
      Source:Corrosion Science, Volume 125
      Author(s): F.A. Almuaili, S.A. McDonald, P.J. Withers, A.B. Cook, D.L. Engelberg
      The reactivation of a corrosion pit under the synergetic effect of strain and electro-chemical polarisation has been observed in a type 304L stainless steel using X-ray computed tomography. The pit reactivation process was associated with the formation of a new pit, directly adjacent to a pre-existing pit. Pit growth kinetics were estimated, revealing an increase of the diffusivity parameter (D eff ΔC) from 3.0×10−8 molcm−1 s−1 to 4.5×10−8 molcm−1 s−1 with the application of strain, indicating higher metal dissolution rates. Applied strain resulted in fractured lacy metal covers, and its effect on pit growth kinetics is discussed.
      Graphical abstract image

      PubDate: 2017-07-23T13:44:54Z
       
  • Corrosion resistance and interfacial morphologies of novel Fe-Cr-Mo-B cast
           steels in molten aluminum
    • Abstract: Publication date: 15 August 2017
      Source:Corrosion Science, Volume 125
      Author(s): Xianman Zhang, Weiping Chen, Hongfeng Luo, Shuang Li, Teng Zhou, Liuyong Shi
      The corrosion resistance and interfacial morphologies of novel Fe-Cr-Mo-B cast steels in molten aluminum have been studied. The result indicates that borides, especial the primary Cr-rich Fe2B, play a key role in improving the corrosion resistance of Fe-Cr-Mo-B cast steels. They are embedded in the intermetallics (corrosion products of the Fe substrate) and act as root to prevent the intermetallics from falling off effectively. The corrosion resistance of Fe-Cr-Mo-B cast steel in molten aluminum is 5 times higher than that of H13.

      PubDate: 2017-07-23T13:44:54Z
       
  • The mechanism of aqueous stress-corrosion cracking of α + β
           titanium alloys
    • Abstract: Publication date: 15 August 2017
      Source:Corrosion Science, Volume 125
      Author(s): Sheng Cao, Suming Zhu, Chao Voon Samuel Lim, Xigen Zhou, Xiaobo Chen, Bruce R.W. Hinton, Rodney R. Boyer, James C. Williams, Xinhua Wu
      In a previous paper (Cao et al., 2017) [1], a transition in fracture mode in aqueous NaCl Stress-Corrosion Cracking (SCC) of Ti-8Al-1Mo–1V was reported. This paper attempts to unravel the operating mechanism for SCC by dislocation analysis on the Focus Ion Beam (FIB) lift-out foils from pre-crack and the SCC regions. It is shown that both basal <a> and <c + a> slips are operative in the SCC region while the basal <a> is the only activated system in the pre-crack region. Moreover, there is an increase in dislocation density in the SCC region compared to the pre-crack region. Based on these observations, combined Absorption Induced Dislocation Emission (AIDE) and Hydrogen Enhanced Localized Plasticity (HELP) is proposed to be the operating mechanisms for SCC in α+β titanium alloys.

      PubDate: 2017-07-23T13:44:54Z
       
  • Impurity and temperature enhanced growth behaviour of anodic aluminium
           oxide from AA5052 Al-Mg alloy using hybrid pulse anodization at room
           temperature
    • Abstract: Publication date: 15 August 2017
      Source:Corrosion Science, Volume 125
      Author(s): C.K. Chung, C.H. Tsai, C.R. Hsu, E.H. Kuo, Y. Chen, I.C. Chung
      Conventional anodic aluminium oxide (AAO) was formed using direct-current anodization from high-purity (99.99%–99.999%) Al foils at low 0–5°C with a growth rate about 2–3μm/h. Here, we investigate the greatly enhanced growth behaviour of AAO from AA5052 Al-Mg alloy (96.6%Al-2.6%Mg) at high 25°C using hybrid-pulse anodization. The Mg-impurity and high-temperature enhanced growth rate of AAO at 25°C is over three-fold to 9.7μm/h; it also reduces the average pore size to 32.2nm from 42.8nm due to high-activity Mg hydrolysis releasing high Mg(OH)2-formation heat and H2 gas. The unique property of AAO from AA5052 is discussed.

      PubDate: 2017-07-23T13:44:54Z
       
  • Microstructure and diffusion coefficient of an old corrosion product layer
           and impact on steel rebar corrosion in carbonated concrete
    • Abstract: Publication date: 15 August 2017
      Source:Corrosion Science, Volume 125
      Author(s): Stéphane Poyet, Wissem Dridi, Valérie L’Hostis, Dietmar Meinel
      Corrosion is the major degradation pathway affecting reinforced concrete structures. In the long-term, the rust layer might become thick and slow down the diffusion of oxygen from the atmosphere to the steel. With this in mind, the mineralogy, microstructure and diffusion properties of an old and thick corrosion product layer were investigated. Despite the presence of macropores, the gas diffusion coefficient was found to be low. The impact of the layer on the oxygen diffusion was evaluated using Fick’s law. The results showed that the layer could reduce the flux of oxygen only in a specific configuration.

      PubDate: 2017-07-23T13:44:54Z
       
  • Bi2S3 modified single crystalline rutile TiO2 nanorod array films for
           photoelectrochemical cathodic protection
    • Abstract: Publication date: 15 August 2017
      Source:Corrosion Science, Volume 125
      Author(s): Juan Hu, Zi-Chao Guan, Yan Liang, Jian-Zhang Zhou, Qing Liu, Hai-Peng Wang, Hui Zhang, Rong-Gui Du
      A combined hydrothermal reaction and sequential chemical bath deposition method is developed for fabricating a Bi2S3 modified single crystalline rutile TiO2 nanorod array film on transparent conductive glass. The results indicate that the modification of Bi2S3 nanoparticles extends the photoresponse of the Bi2S3/TiO2 composite film into the visible light region, and enhances its photoactivity. The Bi2S3/TiO2 film can serve as a photoanode in a photoelectrochemical cell and provide more effective photogenerated cathodic protection for 403 stainless steel in a corrosion cell with a 0.5M NaCl solution under white or visible light illumination compared with the pure TiO2 film.
      Graphical abstract image

      PubDate: 2017-07-23T13:44:54Z
       
  • Influence of biomacromolecule DNA corrosion inhibitor on carbon steel
    • Abstract: Publication date: 15 August 2017
      Source:Corrosion Science, Volume 125
      Author(s): Ke Hu, Jia Zhuang, Jiating Ding, Zhu Ma, Fang Wang, Xianguang Zeng
      The biological macromolecule DNA was used as green corrosion inhibitor to protect X80 carbon steel against 1M HCl solution, and the corrosion behavior was systematically investigated by weight loss, electrochemical measurements, FTIR, and quantum chemistry calculation et al. The results showed that the maximum inhibition efficiency of compound DNA reached 91.9%. It was found that the chemisorption of DNA inhibitor on carbon steel surface resulted from single-molecular-layer self-assembly. The theoretical calculation verified the relationship between the DNA molecular structure and the corrosion inhibition efficiency. The results further demonstrated that the DNA was a promising environment-friend inhibitor with effective inhibition efficiency.

      PubDate: 2017-07-23T13:44:54Z
       
  • Mechanistic insights into the oxidation behavior of Ni alloys in
           high-temperature CO2
    • Abstract: Publication date: 15 August 2017
      Source:Corrosion Science, Volume 125
      Author(s): Richard P. Oleksak, John P. Baltrus, Jinichiro Nakano, Anna Nakano, Gordon R. Holcomb, Ömer N. Doğan
      We present results of a Ni superalloy oxidized for short times in high purity CO2 and similarly in Ar containing≤1ppb O2. A detailed analysis of the oxidized surfaces reveals striking similarities for the two exposure environments, suggesting O2 impurities control the oxidation process in high-temperature CO2. Selective oxidation results in Cr-rich oxide layers grown by outward diffusion, while Cr vacancies left in the metal contribute to significant void formation at the oxide/metal interface. Unlike for most of the alloy surface, the oxidation behavior of secondary phase metal carbides is considerably different in the two environments.

      PubDate: 2017-07-23T13:44:54Z
       
  • A phase field model for simulating the stress corrosion cracking initiated
           from pits
    • Abstract: Publication date: 15 August 2017
      Source:Corrosion Science, Volume 125
      Author(s): Weijie Mai, Soheil Soghrati
      This manuscript presents a new phase field model for simulating the stress corrosion cracking (SCC) phenomenon in metallic materials. To derive the phase field governing equations, the film rupture-dissolution-repassivation model is adopted as the operating mechanism for SCC. The effect of mechanical stresses is incorporated by relating the interface kinetics parameter to the stress intensity factor and stress field near the crack tip. Several numerical examples are presented to verify the accuracy of the proposed model. We also employ this model to investigate the effects of pit morphology, mechanical loading, and the metal microstructure on the SCC evolution.

      PubDate: 2017-07-23T13:44:54Z
       
  • Corrosion resistance of composite oxide film prepared on Ca-added
           flame-resistant magnesium alloy AZCa612 by micro-arc oxidation
    • Abstract: Publication date: 15 August 2017
      Source:Corrosion Science, Volume 125
      Author(s): Oi Lun Li, Mika Tsunakawa, Yuta Shimada, Kae Nakamura, Kazuhito Nishinaka, Takahiro Ishizaki
      A composite oxide film was prepared on a flame-resistant magnesium alloy AZCa612 by micro-arc oxidation (MAO). The thickness of the film was approximately 30μm, where the film was composed of mainly of MgO and Mg-Mn-Al oxide. Potentiodynamic polarization curve measurements demonstrated that the corrosion current density of the composite oxide film coated AZCa612 decreased by 6 orders of magnitude compared to bare substrate. Immersion tests in 5wt.% NaCl solution after 42day indicated the coating phase did not change significantly, which proved that the MAO coating have superior corrosion resistance in 5wt.% NaCl aqueous solution.

      PubDate: 2017-07-23T13:44:54Z
       
  • Oxidation behavior of a new wrought Ni-30Fe-20Cr based alloy at 750°C in
           pure steam and the effects of alloyed yttrium
    • Abstract: Publication date: 15 August 2017
      Source:Corrosion Science, Volume 125
      Author(s): Zhen Yang, Jin-tao Lu, Zheng Yang, Yan Li, Yong Yuan, Yue-feng Gu
      The oxidation behavior of a Ni-30Fe-20Cr base alloy with/without yttrium was studied in pure steam at 750°C. Results showed that the oxide scale formed was equiaxed Cr2O3 and grew parabolically with time. Underneath the scale, Si, Ti and Al was internally oxidized into SiO2, TiO2 and Al2O3, respectively. Alloying 0.05–0.10wt.% yttrium reduced the oxidation rate of the alloy by about 2 factors and improved the oxide adherence and also suppressed the internal oxidation. The reason for it probably lies in the decrease of the outward diffusion of chroumium along grain boundaries.
      Graphical abstract image

      PubDate: 2017-07-23T13:44:54Z
       
  • Hydrogen influence on some advanced high-strength steels
    • Abstract: Publication date: 15 August 2017
      Source:Corrosion Science, Volume 125
      Author(s): Qinglong Liu, Qingjun Zhou, Jeffrey Venezuela, Mingxing Zhang, Andrej Atrens
      This paper studied the influence of hydrogen on some dual-phase (DP), quenching and partitioning (Q&P), and twinning-induced plasticity (TWIP) advanced high-strength steels (AHSS). All steels exhibited hydrogen sensitivity, manifested by (i) decreased yield strength (by a maximum of 13%) attributed to solid-solution softening by hydrogen, and (ii) reduced ductility (maximum decrease of reduction of area was from 65% to 9%), caused by hydrogen assisted fracture processes after the onset of necking. There was no sub-critical crack growth below the ultimate tensile strength. The hydrogen influence increased with increasing strength, more negative charging potential, and decreasing stress rate.

      PubDate: 2017-07-23T13:44:54Z
       
  • Corrosion inhibition of mild steel in simulated seawater solution by a
           green eco-friendly mixture of glucomannan (GL) and bisquaternary ammonium
           salt (BQAS)
    • Abstract: Publication date: 15 August 2017
      Source:Corrosion Science, Volume 125
      Author(s): Xiaohu Luo, Xinyu Pan, Song Yuan, Shuo Du, Caixia Zhang, Yali Liu
      The corrosion inhibition effect of a green eco-friendly mixture comprised of glucomannan (GL) and bisquaternary ammonium salt (BQAS) on the corrosion protection of mild steel in simulated seawater is investigated by electrochemical measurements and surface characterization. It is found that the mixture of GL and BQAS is a mixed-type inhibitor and can provide effective corrosion inhibition for mild steel. The corrosion inhibition is achieved by the chemical as well as physical adsorption of the mixture on the surface of the steel. It is also found that the adsorption fairly obeys Langmuir isotherm.
      Graphical abstract image

      PubDate: 2017-07-23T13:44:54Z
       
  • Interacting sensitivities of alloy 600 PWSCC to stress intensity factor,
           yield stress, temperature, carbon concentration, and crack growth
           orientation Alloy 600
    • Abstract: Publication date: 15 August 2017
      Source:Corrosion Science, Volume 125
      Author(s): M.M. Hall
      Analyses of Alloy 600 primary water stress corrosion cracking data show there are interacting sensitivities of crack growth rate to applied stress intensity factor, yield stress, temperature, carbon concentration and crack growth orientation. The effects of these variables are expressed quantitatively using a crack advance model that is rate-limited by crack-tip-strain rate. Crystallographic texture and dynamic strain aging are considered to account for contrasting behavior observed for ST and LT orientation crack growth. Crack growth is conjectured to be rate-limited by “junction” pinning of mobile dislocations strengthened by interstitial carbon (ST) and “lineal” pinning by substitutional Cr and Fe (LT).

      PubDate: 2017-07-23T13:44:54Z
       
  • Adjustment of temperature coefficient of electrical resistivity in
           Cu66Zr34 metallic glass through surface oxidation induced phase
           decomposition
    • Abstract: Publication date: 15 August 2017
      Source:Corrosion Science, Volume 125
      Author(s): Binbin Liu, Chaoyu Han, Feng Ye
      Amorphous Cu66Zr34 alloy decomposes into Cu, ZrO2, and residual amorphous phase after oxidation, mainly due to differences between the oxygen affinity to Cu and Zr. A four-layer structure formed near the surface consisting of two oxidized layers, a transition region, and the matrix. The crystalline phases exhibited a gradient distribution along the thickness. The oxidized ribbons showed an adjustable temperature coefficient of electrical resistivity as a function of thickness. Near constant electrical resistivity (TCR≈0) could be obtained with a thickness of 20μm. Such transformation can be utilized for producing precision wires or thin-film chip resistors through oxidation.

      PubDate: 2017-07-23T13:44:54Z
       
  • Intergranular oxidation of 316L stainless steel in the PWR primary water
           environment
    • Abstract: Publication date: 15 August 2017
      Source:Corrosion Science, Volume 125
      Author(s): R.P. Matthews, R.D. Knusten, J.E. Westraadt, T. Couvant
      After exposing AISI 316L stainless steel to the primary water environment across a range of temperatures (290°C–360°C) for 1000h, the oxidation growth of the Cr-rich inner layer was measured. Samples exposed at 290°C proved to have significantly greater oxide penetration than samples exposed at the higher temperatures. Furthermore, the annealed samples exhibit strong dependence of oxide growth on microtexture. The results suggest that an epitaxial relationship exists between the metal and the Cr-rich oxide, and that this relationship degrades above 290°C as a result of differential thermal expansion between the oxide and the metal matrix.

      PubDate: 2017-07-23T13:44:54Z
       
  • Effects of bubbles on high-temperature corrosion of helium ion-irradiated
           Ni-based alloy in fluoride molten salt
    • Abstract: Publication date: 15 August 2017
      Source:Corrosion Science, Volume 125
      Author(s): Hanliang Zhu, Rohan Holmes, Tracey Hanley, Joel Davis, Ken Short, Lyndon Edwards, Zhijun Li
      Samples of a Ni-Mo-Cr-Fe-Si alloy subject to helium ion irradiation damage were corroded in a eutectic mixture of FLiNaK at 750°C. It was found that the helium bubbles that formed increased the number of surface defects so greatly increasing the physical contact area between the alloy and the molten salt, resulting in acceleration of corrosion damage. Segregation and depletion of chemical elements at bubble surfaces were also identified, and became more severe with increasing bubble size. Significant segregation of Si resulted in the formation of Ni-Si precipitates at large bubbles. This segregation enhanced the chemical corrosion damage to the alloy.

      PubDate: 2017-07-23T13:44:54Z
       
  • Effect of irradiation damage on corrosion of 4H-SiC in FLiNaK molten salt
    • Abstract: Publication date: 15 August 2017
      Source:Corrosion Science, Volume 125
      Author(s): Jianjian Li, Hefei Huang, Qing Huang, Ming Tang, Bin Zhao, Gengwu Ji, Wei Zhang, Ruobing Xie, Long Yan
      The corrosion behavior of 4H-SiC in the FLiNaK molten salt (650°C), pre-irradiated with 70-keV Si ions to 2.5dpa at 650°C, was investigated in order to clarify the effect of irradiation on corrosion. The irradiated region of 4H-SiC is peeled off by the molten salt, and the corrosion depth is nearly consistent with the irradiation damage depth. Molten salt corrosion leads to the loss of Si element and the formation of carbon-rich phase in irradiated 4H-SiC surface. The broken of Si-C bonds induced by irradiation plays a key role in the irradiation-assisted corrosion of SiC.

      PubDate: 2017-07-23T13:44:54Z
       
  • Three indazole derivatives as corrosion inhibitors of copper in a neutral
           chloride solution
    • Abstract: Publication date: Available online 22 July 2017
      Source:Corrosion Science
      Author(s): Yujie Qiang, Shengtao Zhang, Song Yan, Xuefeng Zou, Shijin Chen
      In this work, three halogeno-indazole compounds were investigated for corrosion inhibition of copper in 3.0wt% NaCl solution using potentiodynamic polarization measurement, electrochemical impedance spectroscopy, and X-ray diffraction (XRD) analysis. The electrochemical results revealed that all of these organics are mixed-type inhibitors with an inhibitive ability order: 4-CIA >4-BIA >4-FIA, which was further confirmed by observations with field emission scanning electron microscope (FE-SEM) and atomic force microscope (AFM). Their favourable performance is ascribed to the formation of inhibitors-adsorption films on copper. Furthermore, theoretical calculations showed the electronic structure of studied compounds and their optimized adsorption configurations on the copper surface.

      PubDate: 2017-07-23T13:44:54Z
       
  • The effect of reversion heat treatment on the degree of sensitisation for
           aluminium alloy AA5083
    • Abstract: Publication date: Available online 22 July 2017
      Source:Corrosion Science
      Author(s): R. Zhang, Y. Zhang, Y. Yan, S. Thomas, C.H.J. Davies, N. Birbilis
      A detailed study of reversion heat treatment on a naturally sensitised field retrieved AA5083 (Al-Mg-Mn) sample was carried out. The reversion temperatures studied were between 150 and 240°C, which span the β-phase (Mg2Al3) transformation temperature. The degree of sensitisation (DoS) prior to and after reversion was investigated via the nitric acid mass loss test (NAMLT); revealing the effect of reversion heat treatment was principally dictated by reversion temperature. The DoS of reversion treated samples was correlated to the grain boundary β-phase continuity, as assessed by quantitative electron microscopy herein.

      PubDate: 2017-07-23T13:44:54Z
       
  • High-temperature corrosion mechanism of YSZ coatings subject to
           calcium–magnesium–aluminosilicate (CMAS) deposits: First-principles
           calculations
    • Abstract: Publication date: Available online 20 July 2017
      Source:Corrosion Science
      Author(s): Haizhong Zheng, Zheng Chen, Guifa Li, Xiaoyong Shu, Ping Peng
      To study the degradation mechanism of yttria-stabilized zirconia (YSZ) coatings by CMAS glass attack at high temperature, density functional theory is used to calculate the energy of CMAS/YSZ(111) system. Over 1513K, the diffusion coefficients of atoms in CMAS are larger than those in YSZ (111) and the diffusion process of (Ca ↔Y) and (Si ↔Y) occurs, which induced to the formation of a sandwich structure and YSZ depleting in yttrium, allowing tetragonal to monoclinic phase transition of zirconia. The cracking and peeling off of the coating is attributed to the change of YSZ volume and the thermal stress.
      Graphical abstract image

      PubDate: 2017-07-23T13:44:54Z
       
  • Corrosion inhibition of copper, mild steel and galvanically coupled
           copper-mild steel in artificial sea water in presence of 1H-benzotriazole,
           sodium molybdate and sodium phosphate
    • Abstract: Publication date: Available online 20 July 2017
      Source:Corrosion Science
      Author(s): Kazem Sabet Bokati, Changiz Dehghanian, Saeed Yari
      In this study, the corrosion inhibition of 1H-benzotriazole (BTA) alone and in combination with Na2MoO4.2H2O and Na3PO4.12H2O on single and coupled copper and mild steel in artificial sea water is evaluated. EIS and polarization results in stagnant and laminar flow conditions in different immersion times indicated that persistence of protective layer formed on single mild steel in presence of BTA is lower than that of copper, though formation of a stable protective layer on coupled copper reduced galvanic corrosion. Multicomponent inhibitor showed a better efficiency compared to BTA alone through protection of both single and coupled copper and mild steel.
      Graphical abstract image

      PubDate: 2017-07-23T13:44:54Z
       
  • The corrosion behaviour of machined AA7150-T651 aluminium alloy
    • Abstract: Publication date: Available online 18 July 2017
      Source:Corrosion Science
      Author(s): Bing Liu, Xinxin Zhang, Xiaorong Zhou, Teruo Hashimoto, Junjie Wang
      The present work investigates the corrosion behaviour of machined AA7150-T651 aluminium alloy. It is found that machining operation introduces a near-surface deformed layer, characterized by ultrafine grains and segregation of Mg and Zn at grain boundaries, to the alloy. The near-surface deformed layer is electrochemically more active compared with the bulk alloy, therefore, is preferentially corroded during immersion in an 3.5wt.% sodium chloride solution acidified to pH 3.2. The open circuit potential of the machined alloy shows a transient at the beginning of immersion in the solution, due to the preferential dissolution of the near-surface deformed layer.

      PubDate: 2017-07-23T13:44:54Z
       
  • Effect of high temperature oxidation on the radiative properties of
           HfC-based ceramics
    • Abstract: Publication date: Available online 17 July 2017
      Source:Corrosion Science
      Author(s): Ludovic Charpentier, Marianne Balat-Pichelin, Jean-Louis Sans, Diletta Sciti, Laura Silvestroni
      Hafnium carbide (HfC) is a promising material for high-temperature heat exchangers due to its high melting point (4170K). Nevertheless, its fast oxidation into fragile hafnia prevents it from being used for open-air solar receivers. The incorporation of silicon-based compounds would reduce its oxidation kinetics and extend the lifetime of HfC-based elements. The oxidation behavior of HfC sintered with the addition of 10vol% TaSi2 or ZrSi2 is here investigated. The optical properties on the as-received surfaces and on the oxidized ones were measured, especially the ratio of the 0.6–2.8μm emissivity (close to the solar absorptivity α) to the total hemispherical emissivity ε. These optical properties are important parameters for applications using concentrated solar radiation.

      PubDate: 2017-07-23T13:44:54Z
       
  • IFC - Editorial Board
    • Abstract: Publication date: 1 August 2017
      Source:Corrosion Science, Volume 124


      PubDate: 2017-07-11T21:10:11Z
       
  • Influence of environment on the development of corrosion product-filled
           paste and a corrosion layer at the steel/concrete interface
    • Abstract: Publication date: 1 August 2017
      Source:Corrosion Science, Volume 124
      Author(s): Yuxi Zhao, Xiaowen Zhang, Weiliang Jin
      Corrosion products at the steel/concrete interface of specimens subjected to different environments were examined. The process of generation of the corrosion product-filled paste (CP), including the corrosion products filling in air voids, was observed. The tiny cracks caused by the artificially accelerated corrosion process were observed to favour CP growth. The thicknesses of CP and the corrosion layer (CL), T CP and T CL were measured, and the T CP − T CL models are established. The T CP − T CL models obtained from this experiment and previous ones are compared, and the influence of environment on the T CP − T CL models is also discussed.

      PubDate: 2017-07-11T21:10:11Z
       
  • Electrochemical corrosion of a noble metal-bearing alloy-oxide composite
    • Abstract: Publication date: 1 August 2017
      Source:Corrosion Science, Volume 124
      Author(s): X. Chen, W.L. Ebert, J.E. Indacochea
      The effects of added Ru and Pd on the microstructure and electrochemical behaviour of a composite material made by melting those metals with AISI 410 stainless steel, Zr, Mo, and lanthanide oxides were assessed using electrochemical and microscopic methods The lanthanide oxides reacted with Zr to form durable lanthanide zirconates and Mo alloyed with steel to form FeMoCr intermetallics. The noble metals alloyed with the steel to provide solid solution strengthening and inhibit carbide/nitride formation. A passive film formed during electrochemical tests in acidic NaCl solution, but became less effective as corrosion progressed and regions over the intermetallics eventually failed.
      Graphical abstract image

      PubDate: 2017-07-11T21:10:11Z
       
  • How relevant is the adsorption bonding of imidazoles and triazoles for
           their corrosion inhibition of copper'
    • Abstract: Publication date: 1 August 2017
      Source:Corrosion Science, Volume 124
      Author(s): Nataša Kovačević, Ingrid Milošev, Anton Kokalj
      Imidazole, 1,2,4-triazole and their 1-methyl derivatives were evaluated as copper corrosion inhibitors in NaCl solution by corrosion experiments and their bonding to Cu(111) was characterised by DFT calculations. Deprotonated triazole adsorbs considerably stronger than 1-methyl-triazole, whereas deprotonated imidazole displays only slightly more exothermic aqueous-phase adsorption free energy than 1-methyl and neutral imidazole. This suggests that triazole should be a more efficient inhibitor than 1-methyl-triazole, whereas the efficiency of imidazole and 1-methyl-imidazole should be similar. The experimental measurements only partly support this inference, because 1-methyl-imidazole accelerates corrosion at higher concentrations.
      Graphical abstract image

      PubDate: 2017-07-11T21:10:11Z
       
  • Nanoscale reactivity of ZnxMg20−x investigated by structural and
           electronic indicators
    • Abstract: Publication date: 1 August 2017
      Source:Corrosion Science, Volume 124
      Author(s): A. Lebon, A. Aguado, A. Vega
      First-principles calculations are reported for a small ZnMg nanoalloy, to get insight into fundamental physico-chemical properties that can be at the roots of the improved efficiency of ZnMg coatings against corrosion. We identify and rationalize composition-dependent features which modulate the noticeable charge transfer from Zn to Mg atoms. Local reactivity indicators demonstrate that Mg sites are, on average, the most reactive ones. Global reactivity indicators show that oxidation of the doped surface is a faster and more exothermic process as compared to a pure zinc surface.

      PubDate: 2017-07-11T21:10:11Z
       
  • Growth kinetics of metastable pits on sputtered nanocrystalline stainless
           steel
    • Abstract: Publication date: 1 August 2017
      Source:Corrosion Science, Volume 124
      Author(s): Tianshu Li, Li Liu, Bin Zhang, Ying Li, Fuhui Wang
      The development of metastable pit on sputtered nanocrystalline stainless steel was investigated in 3.5wt.% NaCl solution. Its current transient is distinct from that of conventional coarse-grained stainless steel. The remnant thin membrane passive film over the pit mouth was found to act as a diffusion barrier, however, it do not undergo continuous rupture during the metastable growth, which restricted the diffusion rate of metal cations away from the pit and kept the current constant. The effect of remnant thin membrane passive film on the growth of metastable pit and its transition to stability has been discussed.

      PubDate: 2017-07-11T21:10:11Z
       
  • Studies on atomic oxygen erosion resistance of deposited Mg-alloy coating
           on Kapton
    • Abstract: Publication date: 1 August 2017
      Source:Corrosion Science, Volume 124
      Author(s): Hong Qi, Yuhai Qian, Jingjun Xu, Meishuan Li
      In this paper, a continuous and uniform Mg-alloy coating was deposited by magnetron sputtering to protect flexible polyimide substrate from atomic oxygen (AO) erosion in the low earth orbit. AO exposure experiments indicated that the erosion yield of the as-deposited Mg-alloy coating was 8.897×10−26 cm3 atom−1, about two orders of magnitude lower than that of blank polyimide. During AO exposure, a relatively compact and continuous thin MgO scale formed on the surface of the Mg-alloy coating, resulting in the enhanced AO erosion resistance of the polyimide with Mg-alloy coating.
      Graphical abstract image

      PubDate: 2017-07-11T21:10:11Z
       
  • The effect of carbon on hydrogen embrittlement in stable Cr-Ni-Mn-N
           austenitic stainless steels
    • Abstract: Publication date: 1 August 2017
      Source:Corrosion Science, Volume 124
      Author(s): Han-Seop Noh, Jee-Hyun Kang, Kwang-Min Kim, Sung-Joon Kim
      The effect of carbon on hydrogen embrittlement in stable austenitic stainless steels is investigated by adding either 0.02 or 0.1wt.% C. During deformation, planar slip is pronounced and fine dislocation structures develop, which is followed by mechanical twinning in both steels. After hydrogen pre-charging, the alloy with higher carbon is more susceptible to hydrogen embrittlement. Based on strain hardening behaviour, it is proposed that C enhances planar slip and refines mechanical twins. Therefore, a higher C concentration results in more sites available for stress concentration and hydrogen trapping, and accelerates the embrittlement.

      PubDate: 2017-07-11T21:10:11Z
       
  • In-situ growth of SiC nanostructures and their influence on anti-oxidation
           capability of C/SiC composites
    • Abstract: Publication date: 1 August 2017
      Source:Corrosion Science, Volume 124
      Author(s): Jixiang Dai, Jianjun Sha, Junqi Shao, Yufei Zu, Mingkai Lei, Stefan Flauder, Nico Langhof, Walter Krenkel
      High purity SiC nanostructures were grown in situ on the surfaces of C/SiC composites by the chemical vapor reaction route to improve the anti-oxidation capability of C/SiC composites. It was found that the SiC nanostructures formed a dense cluster with a thickness of about 20μm. The nanostructures mainly included nanoparticles and nanorods. The oxidation tests found that the SiC nanostructures could significantly improve the anti-oxidation capability of C/SiC composites, particularly, at the temperature beyond 900°C. The improvement of the anti-oxidation capability of the C/SiC composites was attributed to the formation of a silica layer.
      Graphical abstract image

      PubDate: 2017-07-11T21:10:11Z
       
  • Corrosion and radiation resistant nanoceramic coatings for lead fast
           reactors
    • Abstract: Publication date: 1 August 2017
      Source:Corrosion Science, Volume 124
      Author(s): F. García Ferré, A. Mairov, D. Iadicicco, M. Vanazzi, S. Bassini, M. Utili, M. Tarantino, M. Bragaglia, F.R. Lamastra, F. Nanni, L. Ceseracciu, Y. Serruys, P. Trocellier, L. Beck, K. Sridharan, M.G. Beghi, F. Di Fonzo
      Bare and Al2O3-coated austenitic steel samples are exposed to lead-fast-reactor relevant corrosive conditions. Selective leaching of Ni, Mn and Cr is observed in bare samples exposed to high temperature stagnant lead (550°C, 10−8 wt.% oxygen, 1000 and 4000h). By contrast, corrosion is not observed in either pristine (4000h) or irradiated (1000h) coated samples. Further characterization and testing methods include SEM, TEM, STEM, EDS, cyclic nanoimpact, microindentation, scratch, and thermal cycling. Overall, the results show that the coatings retain structural integrity under the conditions investigated, which is a crucial prerogative for corrosion protection with ceramic coatings.
      Graphical abstract image

      PubDate: 2017-07-11T21:10:11Z
       
  • Recurrence plot-based dynamic analysis on electrochemical noise of the
           evolutive corrosion process
    • Abstract: Publication date: 1 August 2017
      Source:Corrosion Science, Volume 124
      Author(s): Wei Liu, Dongzhe Wang, Xiaohua Chen, Chunguang Wang, Haiding Liu
      The cross recurrence plot (CRP) method was applied on the simultaneous current and voltage fluctuation time records in consideration of their possible nonlinear kinetics. Sequential cross recurrence quantification analysis (CRQA), CRP pattern recognition and synchronization analysis were used to screen the paralleled running from the uncorrelated oscillations, to recognize the impedance component, and to identify the synchronization type and degree in the dynamical view point. With the aid of the proposed approach, the sulfur-induced localized corrosion of the alloy 718 in the high temperature brine was detected and evaluated during the evolutive corrosion process.

      PubDate: 2017-07-11T21:10:11Z
       
  • High-temperature oxidation behavior of dense SiBCN monoliths:
           Carbon-content dependent oxidation structure, kinetics and mechanisms
    • Abstract: Publication date: 1 August 2017
      Source:Corrosion Science, Volume 124
      Author(s): Daxin Li, Zhihua Yang, Dechang Jia, Shengjin Wang, Xiaoming Duan, Qishuai Zhu, Yang Miao, Jiancun Rao, Yu Zhou
      The high temperature oxidation behavior of three SiBCN monoliths: carbon-lean SiBCN with substantial Si metal, carbon-moderate SiBCN and carbon-rich SiBCN with excessive carbon, was investigated at 1500°C for times up to15h. Scale growth for carbon-lean and −moderate monoliths at 1500°C cannot be described by a linear or parabolic rate law, while the carbon-rich monoliths oxidize according to a approximately linear weight loss equation. The microstructures of the oxide scale compose of three distinct layers. The passivating layer of carbon and boron containing amorphous SiO2 and increased oxidation resistance of BN(C) both benefit the oxidation resistance.

      PubDate: 2017-07-11T21:10:11Z
       
  • On the role of the electronic states of corrosion inhibitors: Quantum
           chemical-electrochemical correlation study on urea derivatives
    • Abstract: Publication date: 1 August 2017
      Source:Corrosion Science, Volume 124
      Author(s): Mohamed E. Elshakre, Hafsa H. Alalawy, Mohamed I. Awad, Bahgat E. El-Anadouli
      A correlation study is addressed between quantum chemical parameters of five electronic states using Density Functional Theory (DFT) of Urea (U), Thiourea (TU), Selenourea (SU) and Guandine (GU) with the experimentally measured protection efficiency (%P) for the corrosion of low carbon steel in sulphuric acid medium. The best correlation is found for the ground electronic state (S0) of SU followed by TU, U and GU. The results indicate that the chemical model based on bonding between inhibitor and metal is more consistent than the physical model based on electrostatic attraction between heteroatoms and metal.

      PubDate: 2017-07-11T21:10:11Z
       
  • Microstructure evolution and high-temperature mechanical properties of
           SiCf/SiC composites in liquid fluoride salt environment
    • Abstract: Publication date: 1 August 2017
      Source:Corrosion Science, Volume 124
      Author(s): Hongda Wang, Qian Feng, Zhen Wang, Haijun Zhou, Yanmei Kan, Jianbao Hu, Shaoming Dong
      High temperature mechanical properties and microstructure evolution of chemical-vapor-infiltrated SiC fiber reinforced SiC ceramic matrix composites (SiCf/SiC) in 46.5LiF-11.5NaF-42.0KF (mol.%, FLiNaK) eutectic salt were investigated. The results indicate that the corrosion of SiCf/SiC composites was accelerated with increase of corrosion temperature. Interlayer boundaries in SiC matrix with higher oxygen content were corroded preferentially. The F− formed SiF coordinate bond with SiC and replaced carbon, followed by the corrosion of SiC matrix. While single SiC fiber tensile strength suffered no depravation after corrosion, corrosion and damage of SiC matrix led to deteriorated high temperature mechanical properties of SiCf/SiC composites.

      PubDate: 2017-07-11T21:10:11Z
       
  • External α-Al2O3 scale on Ni-base alloy 602 CA. – Part I: Formation and
           long-term stability
    • Abstract: Publication date: 1 August 2017
      Source:Corrosion Science, Volume 124
      Author(s): A. Chyrkin, R. Pillai, T. Galiullin, E. Wessel, D. Grüner, W.J. Quadakkers
      A multi-step oxidation treatment was developed for the NiCrAl-base alloy 602 CA to promote the growth of protective α-Al2O3 scales during exposure at 1100–1200°C in air. Above 1000°C, the alloy forms external chromia scales accompanied by internal alumina precipitation. On the other hand, external alumina grows on alloy 602 CA surface at 800–900°C. The alloy specimens were pre-oxidized at 800°C to form the external α-Al2O3 scale and further exposed at 1100 and 1200°C. The resulting oxide scales were characterized with SEM/EDX, EBSD, and TEM. The pre-grown alumina scale demonstrated good adherence, long-term stability and healing capability.

      PubDate: 2017-07-11T21:10:11Z
       
  • The corrosion inhibition efficiency of aluminum tripolyphosphate on carbon
           steel in carbonated concrete pore solution
    • Abstract: Publication date: 1 August 2017
      Source:Corrosion Science, Volume 124
      Author(s): Xingguo Feng, Ruilong Shi, Xiangyu Lu, Yiwen Xu, Xiufeng Huang, Da Chen
      The efficiency of aluminum tripolyphosphate (ATP) as inhibiting agents for carbon steel was studied in a carbonated concrete pore solution and mortars, respectively. The polarization resistance of the steel and the resistance of the concrete cover layer significantly increased when the content of ATP in mortars increasing. The electrochemical and surface analysis suggests that the stability of the passive film on carbon steel was enhanced by ATP; a tripolyphosphate adsorbed layer also formed on the surface of the steel. Consequently, the pitting corrosion of the steel was effective hindered by ATP both in the pore solution and mortars.

      PubDate: 2017-07-11T21:10:11Z
       
  • Effect of carbo-nitride-rich and oxide-rich inclusions on the pitting
           susceptibility of depleted uranium
    • Abstract: Publication date: 1 August 2017
      Source:Corrosion Science, Volume 124
      Author(s): Zhen Pu, Xianglin Chen, Xiandong Meng, Yanping Wu, Liang Shen, Qingfu Wang, Tianwei Liu, Maobing Shuai
      The effects of carbo-nitride-rich and oxide-rich inclusions on the pitting susceptibility of depleted uranium were investigated by electrochemical corrosion measurements, optical microscopy, scanning Kelvin probe force microscopy (SKPFM), and SEM. The results of the potentiodynamic polarization tests suggest that oxide-rich inclusions are more likely to induce pitting corrosion than carbo-nitride-rich inclusions. This enhanced corrosion may be explained by the strong local galvanic coupling between the oxide-rich inclusion and the surrounding matrix, which, from the sight of SKPFM analysis, exhibits a 115V higher Volta potential than the coupling between the carbo-nitride-rich inclusions and the matrix, respectively.

      PubDate: 2017-07-11T21:10:11Z
       
  • Relationship between inhibition performance of melamine derivatives and
           molecular structure for mild steel in acid solution
    • Abstract: Publication date: 1 August 2017
      Source:Corrosion Science, Volume 124
      Author(s): Liu Li Liao, Shi Mo, Hong Qun Luo, Yu Jun Feng, Hong Yao Yin, Nian Bing Li
      The influence of substituent groups on the inhibition performance of the heterocyclic ring is attractive in the field of corrosion inhibitor. The modification of various polar functional groups including dimethylamino ethyl and dimethylamino propyl groups on melamine ring can endow these compounds with good water solubility and even high corrosion inhibition efficiency. The inhibition properties of five functional melamine compounds with methyl and different numbers of tertiary amino groups were investigated electrochemically and theoretically. The inhibition mechanisms of these inhibitors for mild steel in acid solution and the relationship between their inhibition performances and molecular structures are also discussed.

      PubDate: 2017-07-11T21:10:11Z
       
  • Effect of cold deformation on the corrosion behaviour of UNS S31803 duplex
           stainless steel in simulated concrete pore solution
    • Abstract: Publication date: 1 August 2017
      Source:Corrosion Science, Volume 124
      Author(s): Hong Luo, Xianzong Wang, Chaofang Dong, Kui Xiao, Xiaogang Li
      The effect of cold deformation on the corrosion and passivation behaviour of UNS S31803 duplex stainless steel in saturated Ca(OH)2 solution containing 3.5wt.% NaCl was investigated. The results demonstrated that cold deformation changes the internal microstructure of two phases. Cold deformation was detrimental to the pitting corrosion resistance of duplex stainless steel. Metastable pitting events were enhanced by cold deformation. It also revealed that metastable pit initiation sites transfer from austenite phase to ferrite phase at cold deformation level higher than 70%. Moreover, compositions change and dehydration effect in the passive film were also related to cold deformation.

      PubDate: 2017-07-11T21:10:11Z
       
  • Coaxial anodic oxidation under dynamic electrolyte conditions for inner
           surface patterning of high-aspect-ratio and slim Ti tubes
    • Abstract: Publication date: 1 August 2017
      Source:Corrosion Science, Volume 124
      Author(s): Ye Wang, Lidong Sun, Chengjie Xiang, Xiaoli Zhao, Sujuan Wu, Sam Zhang
      We report a feasible and facile approach of coaxial anodic oxidation under dynamic electrolyte conditions for patterning Ti tubes. Uniform TiO2 nanotube arrays are prepared at the inner surface of Ti tubes with 930mm in length and 3mm in diameter, being the largest aspect ratio ever reported. Interestingly, a resulting structure of nanowire bundles standing upright the nanotubes, anodized at 20V for 4h with an electrolyte flow rate of 12.2μL/s, exhibits superhydrophobic feature with a water contact angle of 165° and sliding angle of <2°. Its potential application in drag reduction is also demonstrated.
      Graphical abstract image

      PubDate: 2017-07-11T21:10:11Z
       
  • IFC - Editorial Board
    • Abstract: Publication date: 15 July 2017
      Source:Corrosion Science, Volume 123


      PubDate: 2017-06-22T10:15:52Z
       
  • The rotating cylinder electrode for studies of corrosion engineering and
           protection of metals—An illustrated review
    • Abstract: Publication date: 15 July 2017
      Source:Corrosion Science, Volume 123
      Author(s): F.C. Walsh, G. Kear, A.H. Nahlé, J.A. Wharton, L.F. Arenas
      The uniform flow generated at moderate rotation speeds, controlled mass transport rate and uniform current distribution make the RCE attractive for turbulent flow studies of corrosion and protection. Controlled flow and mass transport are characterised by peripheral velocity and mass transport coefficient. Important aspects in corrosion include metal dissolution, oxygen reduction, stability of surface oxide films and porosity of protective coatings. Computational studies allow fluid flow, current distribution and mass transport to be simulated; multiphase electrolytes and nanofluids have been experimentally studied over the last decade. Diverse uses of the RCE include cathodic protection, corrosion inhibitors and protective coatings.
      Graphical abstract image

      PubDate: 2017-06-22T10:15:52Z
       
  • Transition from superhydrophilic to superhydrophobic state of laser
           textured stainless steel surface and its effect on corrosion resistance
    • Abstract: Publication date: 15 July 2017
      Source:Corrosion Science, Volume 123
      Author(s): Uroš Trdan, Matej Hočevar, Peter Gregorčič
      This work investigates the evolution from superhydrophilic to superhydrophobic surface state on corrosion behaviour of SS316L produced by Nd:YAG nanosecond direct laser texturing (DLT). Results confirm perfect correlation among wettability and corrosion, hence superhydrophobic surface with a contact angle of 168±3.0° reflects in enhanced passivity, lower anodic dissolution and corrosion current reduction. Characterization of the corrosion attack by 3D microscopy reveals high sensitivity of superhydrophilic surfaces on corrosion propagation direction in regard to the laser beam passage (90°/0°). However, this trend completely diminishes with superhydrophobic development. Further, DLT also completely prohibits intergranular corrosion detected with the non-processed sample.
      Graphical abstract image

      PubDate: 2017-06-22T10:15:52Z
       
  • Hot corrosion of arc ion plating NiCrAlY and sputtered nanocrystalline
           coatings on a nickel-based single-crystal superalloy
    • Abstract: Publication date: 15 July 2017
      Source:Corrosion Science, Volume 123
      Author(s): Jinlong Wang, Minghui Chen, Yuxian Cheng, Lanlan Yang, Zebin Bao, Li Liu, Shenglong Zhu, Fuhui Wang
      Hot corrosion in sulfate salt at 850°C of three metallic coatings is investigated comparatively. The NiCrAlY coating loses its protectiveness after 200h corrosion. Its oxide scale spalls off partly and becomes porous as a consequence of basic fluxing. The nanocrystalline coating (SN) performs better than the NiCrAlY one, but its scale is porous as well. Oxidation and/or sulfidation of Ta account for the formation of pores. The yttrium modified nanocrystalline coating (SNY) provides the highest corrosion resistance. Yttrium completely inhibits oxidation and sulfidation of Ta. Its scale is intact and adherent, and exclusively composted of alumina.

      PubDate: 2017-06-22T10:15:52Z
       
 
 
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