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  • Enhanced High-Temperature Oxidation Resistance of a Zirconium Alloy Cladding by High-Temperature Preformed Oxide on the Cladding
    Corros. Sci. (IF 5.245) Pub Date : 2017-11-16
    Cheol Min Lee, Dong-Seong Sohn

    Using a zirconium alloy, pre-oxidation was conducted at 1200 °C in a steam environment, and the pre-oxidised specimens were oxidised at 1012, 1100, and 1200 °C. The preformed oxide enhanced the oxidation resistance significantly during the subsequent oxidation at 1012 and 1100 °C. In addition, the preformed oxide enhanced the breakaway oxidation resistance greatly at 1012 °C. The microstructures of the preformed oxide were analysed using TEM and EPMA. The oxidation resistance enhancement may be related to the large columnar grain width of the preformed oxide and Zr-Sn type precipitates formed at the grain boundaries.

    更新日期:2017-11-17
  • Desulfurized flue gas corrosion coupled with deposits in a heating boiler
    Corros. Sci. (IF 5.245) Pub Date : 2017-11-14
    Peiyuan Pan, Heng Chen, Zhiyuan Liang, Qinxin Zhao

    In-plant corrosion tests of five steels were conducted in a heating boiler in China to study the desulfurized flue gas corrosion coupled with deposits after the FGD (flue gas desulfurization) unit. The surface temperature of the steel was the key factor in the deposition and corrosion process. As the surface temperature increased, the corrosion of the steels was first exacerbated due to the increase in the Cl− concentration in the deposits and then mitigated due to the lack of the electrolyte. The stainless steels in this work showed much better performance than did the low alloy steel.

    更新日期:2017-11-16
  • The effect of work-hardening and thermal annealing on the early stages of the uranium-hydrogen corrosion reaction
    Corros. Sci. (IF 5.245) Pub Date : 2017-11-14
    A. Banos, C.P. Jones, T.B. Scott

    The characteristics of hydride formation on metallic U at the early stages were investigated for three differently treated samples. The first sample reacted in its as-received state, the second was thermally annealed and the third sample underwent cold work-hardening prior to reaction with deuterium. From the analysis, the vacuum heat-treated sample was found to be more resilient to hydriding at the nucleation and growth stage, exhibiting a reduced number of nucleation points when compared to the as-cast uranium. The work-hardened sample was observed to be more susceptible to H2 corrosion, displaying very dissimilar hydriding behaviour when compared to the other.

    更新日期:2017-11-16
  • Study of dynamic degradation behaviour of porous magnesium under physiological environment of human cancellous bone
    Corros. Sci. (IF 5.245) Pub Date : 2017-11-14
    Amir Putra Md Saad, Ardiyansyah Syahrom

    This study analyse the effect of integrating of physiological environment of human cancellous bone as shown by different level of cyclic compressive on the degradation behaviour of porous magnesium under dynamic immersion for bone scaffold applications. The porous magnesium (30%, 41% and 55% of porosity) were immersed in simulated body fluid (SBF) with flowrate 0.0025 ml/min while having dynamic loading (1000 με, 2000 με and 3500 με) for 24, 48 and 72 h. The influenced integrating both boundaries have increased the relative weight loss and degradation rate as high as 61.56% and 93.67%, respectively as compared to dynamic immersion test only.

    更新日期:2017-11-14
  • Effects of metal cations on mild steel corrosion in 10 mM Cl aqueous solution
    Corros. Sci. (IF 5.245) Pub Date : 2017-11-13
    Md. Saiful Islam, Kyohei Otani, Masatoshi Sakairi

    The influences of metal cations on the corrosion of mild steel in 10 mM Cl− aqueous solutions were investigated by electrochemical techniques and immersion tests. Immersion tests and electrochemical impedance spectroscopy (EIS) results showed that Zn2+ has a significant effect on corrosion inhibition. Surface morphological inspection also showed the smooth surface of specimen immersed in Zn2+ containing solution. Analysis of X-ray photoelectron spectroscopy showed that Zn2+ was incorporated in the oxide films by making a strong bond. It is supposed that Zn2+ forms a very effective shielding film which can inhibit the electrochemical reactions, and consequently lowers the corrosion rate.

    更新日期:2017-11-14
  • Effect of Anodic Potential on the Electrochemical Response of Passive Layers Formed on the Surface of Coarse- and Fine-Grained Pure Nickel in Borate Buffer Solutions
    Corros. Sci. (IF 5.245) Pub Date : 2017-11-13
    Arash Fattah-alhosseini, Majid Naseri, Seyed Omid Gashti, Saeed Vafaeian, Mohsen K. Keshavarz

    In the present work, the role of cold deformation and anodic potential on the electrochemical response of pure nickel in borate buffer solutions were investigated. The application of cold deformation gave rise to a more localized microstructure that contained a greater number of fine grains. In order to investigation of the electrochemical response of specimens, potentiodynamic polarization (PDP), electrochemical impedance spectroscopy (EIS), and Mott–Schottky (M–S) analysis were performed. As a result, with increasing of applied potential, the polarization resistance and passive film thickness decreased. Also, density of electron acceptor at passive layer decreased by increasing of applied potential.

    更新日期:2017-11-14
  • The golden alloy Cu-5Zn-5Al-1Sn: a multi-analytical surface characterization
    Corros. Sci. (IF 5.245) Pub Date : 2017-11-13
    Tingru Chang, Inger Odnevall Wallinder, Ying Jin, Christofer Leygraf

    The golden alloy Cu-5Zn-5Al-1Sn has found many applications because of its appearance and resistance to tarnishing. The microstructure and multi-component surface oxide of Cu-5Zn-5Al-1Sn have been investigated through a multi-analytical approach. Compared to commercial Cu metal, Cu-5Zn-5Al-1Sn has significantly smaller grains and higher fraction of coherent twin boundaries. The 5–10 nm thick oxide formed after diamond polishing has four identified sub-oxides all contributing to the overall corrosion resistance. Cu2O is mainly located in the outer part, followed by ZnO, SnO2 and Al2O3 closer to the alloy substrate. The latter three possess barrier properties, while Cu2O exhibits a more complex structure.

    更新日期:2017-11-14
  • Comparison of hydrogen embrittlement susceptibility of three cathodic protected subsea pipeline steels from a point of view of hydrogen permeation
    Corros. Sci. (IF 5.245) Pub Date : 2017-11-12
    Timing Zhang, Weimin Zhao, Tingting Li, Yujiao Zhao, Qiushi Deng, Yong Wang, Wenchun Jiang

    Revealing the hydrogen permeation behavior in steel is the foundation to analyze hydrogen induced fracture. Herein, slow strain rate tension tests were used to investigate the susceptibility of X70, X80 and X100 steel to hydrogen embrittlement induced by cathodic polarization, and the subsurface hydrogen concentration (C0) of three steels was accurately determined by two kinds of hydrogen permeation tests. Results showed that the HE index range of ductile-to-brittle transition should be determined by fracture analysis. The C0 increased in turn from X70, X80 to X100 at any given applied potential, that’s why X100 presented the highest hydrogen embrittlement susceptibility.

    更新日期:2017-11-13
  • 1 Preparation of Super-hydrophobic Micro-needle CuO Surface as a Barrier against Marine Atmospheric Corrosion
    Corros. Sci. (IF 5.245) Pub Date : 2017-11-12
    Wenwen Dou, Jiajia Wu, Tingyue Gu, Peng Wang, Dun Zhang

    A super-hydrophobic (SH) CuO surface was prepared on copper using chemical etching followed by fluorination treatment. The relationship between surface morphology and hydrophobicity was investigated. When the etching time varied from 5 to 120 min, morphology changed from sparse sharp needles to dense sharp needles, and then to a stamen-like structure with flower-like clusters. All these surfaces were SH with the dense micro-needle surface (10 min etching) the best. This SH surface made salt (NaCl) particles deliquesce and roll away. Electrochemical tests showed that it reduced corrosion in a 3.5% (w/w) NaCl solution by more than 102 times.

    更新日期:2017-11-13
  • Controlled delivery of multi-substituted triazole by metal-organic framework for efficient inhibition of mild steel corrosion in neutral chloride solution
    Corros. Sci. (IF 5.245) Pub Date : 2017-11-11
    Huiwen Tian, Weihua Li, Ang Liu, Xiang Gao, Peng Han, Rui Ding, Cuizhen Yang, Dapeng Wang

    A triazole-based compound containing multiple active groups and promising strategy of controlled delivery by metal-organic framework were developed for corrosion inhibition of mild steel in 0.5 M NaCl solution. Electrochemical analysis showed the inhibitor effectively suppressed both the anodic and cathodic reactions by forming an protective film, achieving the efficiency around 98% at an optimal concentration of 5.5 × 10−4 M. Impressively, the inhibitor loading onto MOF particles leads to a reduction of optimal dosage by a factor of 4. The equivalent concentration of the loaded inhibitor is less than 1.3 × 10−4 M. The results of electrochemical quartz crystal microbalance measurement and surface characterization indicated the controlled delivery largely enhances the inhibition ability by giving rise to densification of protective film. Combined spectroscopic analysis provided direct evidences for the inhibitor-MOF interaction and film formation mechanism.

    更新日期:2017-11-13
  • Electrochemical Profiling of Multi-Clad Aluminium Sheets used in Automotive Heat Exchangers
    Corros. Sci. (IF 5.245) Pub Date : 2017-11-11
    Kirill Bordo, Visweswara C. Gudla, Lionel Peguet, Andreas Afseth, Rajan Ambat

    A combination of glow discharge optical emission spectroscopy sputtering and local electrochemical measurements was used to determine electrochemical changes upon brazing in a multi-layered Aluminium sheet (AA4343/AA3xxx/AA4343) with an additional low-Cu (AA3xxx) interlayer. Ecorr values from potentiodynamic polarization, galvanic corrosion behaviour by ZRA, microstructure and composition by SEM and TEM were investigated and compared to those obtained for sheet without the interlayer. Inward diffusion of Si from clad, and outward diffusion of Cu from core are found to degrade the corrosion properties of conventional sheet, whereas presence of interlayer reduced outward diffusion of Cu and hence improved corrosion protection.

    更新日期:2017-11-13
  • Factors affecting isothermal oxidation of pure chromium in air
    Corros. Sci. (IF 5.245) Pub Date : 2017-11-10
    Ali S. Dorcheh, Michael Schütze, Mathias C. Galetz

    Isothermal oxidation kinetics of pure chromium at 950–1200 °C in purely oxidizing (Ar-20%O2), purely nitriding (N2-5%H2), and oxidizing-nitriding (synthetic air, N2-20%O2) atmospheres were studied. Effects of factors such as oxide volatilization, multiple mass-gains, and nitridation on oxidation kinetics of chromium were investigated using thermal analysis, acoustic emission analysis, and electron microscopy. Results obtained in single oxidant atmospheres compared to those obtained in air clearly showed the transparency of chromia against nitrogen in air. The abrupt mass gain steps observed during isothermal oxidation were appeared due to the local oxide scale failure resulting from growth stresses in the thermally grown chromia scale.

    更新日期:2017-11-11
  • High temperature oxidation behaviour of Ag–36.35 wt.% Zn and Ag–38.50 wt.% Zn–0.60 wt.% Al
    Corros. Sci. (IF 5.245) Pub Date : 2017-11-10
    S. Chandra-ambhorn, P. Chumpanya

    Ag–36.35 wt.% Zn and Ag–38.50 wt.% Zn–0.60 wt.% Al were oxidised in air at 450–650 °C up to 48 hours. The oxidation kinetics of both alloys were parabolic with the lower rate constant for the latter alloy. After oxidation for 48 hours, thermal oxide scale on Ag–36.35 wt.% Zn was ZnO at all studied temperatures. When 0.60 wt.% Al was added to Ag–38.50 wt.% Zn, ZnO and ZnAl2O4 were formed at all studied temperatures. Al2O3 was evidently observed at 550 and 650 °C. The formation of Al-containing oxides helped reduce the oxidation rate of Ag–38.50 wt.% Zn–0.60 wt.% Al.

    更新日期:2017-11-11
  • Effects of Si, Al and Ti on corrosion of Ni-20Cr and Ni-30Cr alloys in Ar-20CO2 at 700 °C
    Corros. Sci. (IF 5.245) Pub Date : 2017-11-10
    Thuan Dinh Nguyen, Jianqiang Zhang, David J. Young

    Model alloys Ni-(20, 30)Cr (wt.%) with (0.1, 1)% Si, 1.5% Al or (1, 2)% Ti were exposed to Ar-20CO2 at 700 °C. Samples were electropolished before reaction to avoid cold working effects on alloy diffusion. The Ni-20Cr alloy formed a thick NiO scale and an internal oxidation zone, whereas Ni-30Cr formed a duplex scale of NiO and Cr2O3 layers. The Si and Al additions increased the oxidation resistance by forming additional protective layers of SiO2 or Al2O3. Titanium accelerated chromia growth, promoting alloy surface coverage with protective oxide. All alloys formed intergranular Cr-rich carbide precipitates beneath their scales.

    更新日期:2017-11-10
  • Role of inclusions in the pitting initiation of pipeline steel and the effect of electron irradiation in SEM
    Corros. Sci. (IF 5.245) Pub Date : 2017-11-10
    Yafei Wang, Guangxu Cheng, Wei Wu, Yun Li

    The role of inclusions in the initiation of corrosion pits for a high strength pipeline steel in NaCl solution was investigated. The inclusions with typical compositions of Al-Mg-Ca-S-O were found typically spherical and responsible for the initiation of circular corrosion pits. The possible formation mechanism of the spherical inclusions and their role in the initiation of pitting corrosion are discussed. The electron irradiation in scanning electron microscopy, including the morphology observation and energy-dispersive X-ray spectroscopy test, was found to have significant influence on the pitting susceptibility around the inclusions.

    更新日期:2017-11-10
  • Benzotriazole and cerium chloride as corrosion inhibitors for AA2024-T3: an EIS investigation supported by SVET and ToF-SIMS analysis
    Corros. Sci. (IF 5.245) Pub Date : 2017-11-10
    L.B. Coelho, D. Cossement, M.-G. Olivier

    The inhibitive effects provided by benzotriazole (BTA) and cerium chloride (CeCl3) on 2024-T3 aluminium alloy were assessed, individually and combined, in 0.05 M NaCl electrolytes, by means of Electrochemical Impedance Spectroscopy (EIS). From the analysis of impedance fitted parameters, a synergistic effect appears to exist between both inhibitors until 14 days of immersion. The Scanning Vibrating Electrode Technique (SVET) was applied to an Al/Cu galvanic coupling model in order to better comprehend the observed inhibitive actions. Additionally, Time of Flight Secondary Ion Mass Spectrometry (ToF-SIMS) was employed to evaluate the in-depth distribution of species related to the inhibitive film/alloy interface.

    更新日期:2017-11-10
  • Localized corrosion behaviour of AA7150 after ultrasonic shot peening: corrosion depth vs. impact energy
    Corros. Sci. (IF 5.245) Pub Date : 2017-11-10
    Qingqing Sun, Qingyou Han, Rong Xu, Kejie Zhao, Jie Li

    The effect of impact energy on localized corrosion behaviour of ultrasonic shot peened AA 7150 was systematically studied by manipulating peening parameters such as peening duration, peening amplitude, peening distance and peening media size. Needle-like pits with depths deeper than that of the untreated alloy were observed on low energy peened samples. However, localized corrosion was eliminated for high energy peened alloys. The formation of equiaxed nanograins on surface layer significantly enhanced pit initiation resistance but accelerated propagation kinetics. Galvanic interaction between surface layer and substrate alloy caused by surface segregation was also discussed.

    更新日期:2017-11-10
  • Fabrication of surface-porous Mg–Al alloys with different microstructures in a neutral aqueous solution
    Corros. Sci. (IF 5.245) Pub Date : 2017-11-09
    Feng Yang, Ze-ying Yan, Ying-hui Wei, Yong-gang Li, Huan Wei, Li-feng Hou

    Surface-porous Mg–Al alloys with different microstructures were fabricated via a new method of electrochemical dealloying in a neutral 0.6M NaCl solution. A bimodal porous structure with 47.57 ± 11.43 μm large pores and 265.60 ± 78.68nm honeycomb-like fine pores was obtained by direct electrochemical dealloying of as-cast Mg80Al20 alloy. Following annealing, the eutectic structure disappeared and a bicontinuous, single-sized, porous structure with 7.10 ± 1.96 μm ligaments was created by an annealing-electrochemical dealloying approach. The porous formation mechanism is governed by selective dissolution of the α-Mg phase, which leaves the Mg17Al12 phase as the porous layer framework.

    更新日期:2017-11-10
  • Investigating the effect of Cu-rich phase on the corrosion behavior of Super 304H austenitic stainless steel by TEM
    Corros. Sci. (IF 5.245) Pub Date : 2017-11-09
    X.Y. San, B. Zhang, B. Wu, X.X. Wei, E.E. Oguzie, X.L. Ma

    The precipitation of a fine Cu-rich phase dispersedly distributed in the austenitic matrix can impart the novel properties of Super 304H SS. However, the contributions have not been well understood due to the difficulty encountered in obtaining precise experimental information on the corrosion events introduced by the nano-sized Cu-rich precipitates. In this work, we have applied TEM and clarified the dissolution occurred in Cu-rich phase and the dissolution-induced evolution in structure and chemistry on the surface. This work enabled us glean atomic scale insights on the effect of the Cu-rich phase on the corrosion behavior of the Super 304H SS.

    更新日期:2017-11-10
  • Electrochemical behaviour of martensitic stainless steel after immersion in a H2S-saturated solution
    Corros. Sci. (IF 5.245) Pub Date : 2017-11-08
    Xiaowei Lei, Hongyan Wang, Feixiong Mao, Junping Zhang, Anqing Fu, Yaorong Feng, Digby D. Macdonald

    Time dependent experiments were carried out to study the corrosion behaviour of Super 13Cr martensitic stainless steel after immersion in a H2S-saturated solution. The Point Defect Model was employed to obtain key parameters. With increasing immersion time, the corrosion product layer thickened, but displayed a defective structure. The thickness of the barrier layer decreased with extending the H2S-exposure time, which notably lowered the corrosion resistance. The presence of the corrosion scale resulted in a thinner barrier layer in contrast to that without the scale. With/without the corrosion scale, no semi-conductivity and no passive region was observed for Super 13Cr after 96 h-immersion. The hydrogen ingress during H2S-exposure lowered the passivity of the bare alloy substrate.

    更新日期:2017-11-10
  • Galvanic effect of magnetite on the corrosion behavior of carbon steel in deaerated alkaline solutions under flowing conditions
    Corros. Sci. (IF 5.245) Pub Date : 2017-11-08
    Geun Dong Song, Soon-Hyeok Jeon, Yeong-Ho Son, Jung Gu Kim, Do Haeng Hur

    The effect of magnetite on the corrosion of carbon steel was investigated in simulated secondary water of pressurized water reactors at 60 °C by using the immersion and electrochemical tests. The corrosion rate of carbon steel was increased by the galvanic coupling with magnetite, and was more accelerated with increasing the area ratio of magnetite to carbon steel. From the electrochemical behavior of carbon steel and magnetite, it was verified that the corrosion of carbon steel is accelerated by a galvanic corrosion mechanism. This phenomenon is expected to be an acceleration factor on the corrosion of carbon steel piping.

    更新日期:2017-11-10
  • Coupling of electrochemical, electrogravimetric and surface analysis techniques to study dithiocarbamate/bronze interactions in chloride media
    Corros. Sci. (IF 5.245) Pub Date : 2017-11-08
    W. Qafsaoui, A. Et Taouil, M.W. Kendig, H. Cachet, S. Joiret, H. Perrot, H. Takenouti

    Interaction between ammonium pyrrolidinedithiocarbamate (PDTC) and bronze in 30 g L−1 NaCl was investigated at several concentrations between 0.1 and 10 mM by means of various electrochemical and spectroscopic techniques. Electrochemical measurements revealed a fast adsorption process of PDTC on Cu and Pb and the formation of a thick insulating and protective film with a high surface coverage. At high concentrations, PDTC prevents oxides formation. Surface analyses confirm PDTC adsorption on bronze mainly via interaction between sulphur atoms and Cu sites to form CuI-PDTC complex.

    更新日期:2017-11-10
  • Failure mechanism transition of hydrogen embrittlement in AISI 304 K-TIG weld metal under tensile loading
    Corros. Sci. (IF 5.245) Pub Date : 2017-11-08
    Xiaogang Li, Baoming Gong, Caiyan Deng, Yizhe Li

    The effect of hydrogen on the tensile properties of AISI 304 K-TIG weld metal is investigated in this study. Fractographic analysis demonstrates a transition from quasi-cleavage/cleavage fracture to intergranular fracture in the brittle zone as the hydrogen-charging current density increases, which is attributed to the interplay of crystalline defect, hydrogen atoms, and α′ martensite transformation sites. It is believed that at low current density, α′ martensite nucleates and grows homogeneously in the interior of the grain. At high current density, the stress-induced α′ martensite forms preferentially at the grain boundary, which undergoes severe strain localisation and hydrogen atom segregation.

    更新日期:2017-11-10
  • Synergistic effects of fluoride and chloride on general corrosion behavior of AISI 316 stainless steel and pure titanium in H2SO4 solutions
    Corros. Sci. (IF 5.245) Pub Date : 2017-11-08
    Z.B. Wang, H.X. Hu, Y.G. Zheng

    The general corrosion behavior of AISI 316 stainless steel (316 SS) and pure titanium (pure Ti) in H2SO4 solutions containing fluoride (F−) and chloride (Cl−) ions was evaluated quantitatively using potentiodynamic polarization tests. The general corrosion resistance of these two materials to F− and Cl− is compared and explained by the proposed mechanisms based on XPS analyses. Furthermore, F− and Cl− are found to have synergistic effects on the general corrosion behavior of these two materials, which are attributed to the effects of F− and Cl− on the penetration of each other into the film.

    更新日期:2017-11-10
  • The effect of cold rolling on grain boundary structure and stress corrosion cracking susceptibility of twins in alloy 690 in simulated PWR primary water environment
    Corros. Sci. (IF 5.245) Pub Date : 2017-11-07
    Wenjun Kuang, Gary S. Was, Cody Miller, Mike Kaufman, Talukder Alam, Bharat Gwalani, Rajarshi Banerjee

    The effects of cold rolling on the structure and stress corrosion cracking (SCC) susceptibility of twin boundaries in alloy 690 were studied. Most of the twin boundaries were transformed into random high angle boundaries (RHABs) following cold rolling. The transformed twin boundaries (TTBs) showed increased susceptibility to carbide precipitation during subsequent aging at 475 °C. The SCC initiation test in 360 °C hydrogenated water indicated that the prior RHABs exhibited increased SCC susceptibility after cold rolling. Moreover, TTBs become susceptible to SCC due to the promoted outward diffusion of Cr and can enhance the connectivity of susceptible grain boundaries.

    更新日期:2017-11-10
  • Fabrication and Corrosion Resistance of a Graphene-Tin Oxide Composite Film on Aluminium Alloy 6061
    Corros. Sci. (IF 5.245) Pub Date : 2017-10-31
    Linghui Yang, Yunxiao Wan, Zhenlan Qin, Qunjie Xu, Yulin Min

    The synthesis of a graphene-tin oxide composite film prepared on aluminium alloy 6061 by self-assembly and hydrothermal methods is reported. The surface morphology of the film was investigated using field-emission scanning electron microscopy. The composition and microstructure were investigated using X-ray diffraction, Raman spectroscopy and X-ray photoelectron spectroscopy. The corrosion behaviour of the film was studied using an electrochemical method in a mixed acidic solution of 0.5 M H2SO4 and 2 ppm HF. The resulting protection efficiency was up to 99.7%, illustrating that the film can immensely improve the corrosion of this alloy in a heavily acidic environment.

    更新日期:2017-11-01
  • Corrosion Behaviour of a Quenched and Partitioned Medium Carbon Steel in 3.5 wt.% NaCl Solution
    Corros. Sci. (IF 5.245) Pub Date : 2017-10-31
    Jilan Yang, Yufei Lu, Zhenghong Guo, Jianfeng Gu, Caixiang Gu

    In this work, the corrosion characteristics of a quenched and partitioned (Q&P) medium carbon steel in a 3.5 wt.% NaCl solution were investigated by various surface analysis techniques and then compared with those of the quenched and tempered steel with the same composition. Both steels exhibited nearly identical corrosion variation trends. However, the Q&P specimen demonstrated a lower corrosion rate. The formation of retained austenite in the carbon-enriched state increases the corrosion potential of the carbon-depleted martensitic matrix and decreases the residual tensile stress on the Q&P surface, thus enhancing its corrosion resistance.

    更新日期:2017-11-01
  • Durability improving and corrosion-resistance mechanism of graphene oxide modified ultra-thin carbon paper used in PEM fuel cell
    Corros. Sci. (IF 5.245) Pub Date : 2017-10-31
    Piaopiao Yang, Xiaobo Wu, Zhiyong Xie, Pan Wang, Chunbo Liu, Qizhong Huang

    The corrosion-resistance properties of modified ultra-thin carbon paper (CP) different graphene oxide (GO) content used in proton exchange membrane fuel cells (PEMFC) are studied for the first time.Resultsshow that CP with 1 wt% GO has distinguished corrosion-resistance property (corrosion current: 5.539E-8A.cm−2, minimum weight loss and contact angle variation). And mechanism analysis was found that the CP-1GO-P had uniform florine coating on some area of carbon fiber while T-CP-P has little. Moreover, the addition of GO could introduce more C<img border="0" alt="double bond; length as m-dash" src="https://cdn.els-cdn.com/sd/entities/dbnd" class="glyphImg">O and C-O groups which interact with the florine atom, thus can strengthen the bonding of PTFE and matrix carbon effectively.

    更新日期:2017-11-01
  • Oxidation of TbFe2: Microstructure of oxide-film by both theory and experiment
    Corros. Sci. (IF 5.245) Pub Date : 2017-10-31
    Krishna Manwani, Arout J. Chelvane, Emila Panda
    更新日期:2017-11-01
  • Saltwater Corrosion Behavior of Cold Sprayed AA7075 Aluminum Alloy Coatings
    Corros. Sci. (IF 5.245) Pub Date : 2017-10-31
    Sieglind Ngai, Tungwai Ngai, Florian Vogel, William Story, Gregory B. Thompson, Luke N. Brewer

    Salt water corrosion behavior of cold sprayed AA7075 is examined. Coatings on AA7075-T651 substrates were prepared by cold spraying AA7075 powder using He and N2 as carrier gases. Severe plastic deformation is only observed in the helium sprayed samples. Electrochemical experiments performed on the coatings reveal inferior corrosion resistance of the N2 sprayed samples, although both coatings exhibit lesser corrosion resistance than the AA7075-T651 substrate. The localized corrosion response is qualitatively different between the three materials with large scale pitting in the plate material, limited pitting in the helium sprayed material, and microscale crevice corrosion in the nitrogen sprayed material.

    更新日期:2017-11-01
  • 更新日期:2017-10-30
  • Corrosion of mild steel at the seawater/sediments interface: mechanisms and kinetics
    Corros. Sci. (IF 5.245) Pub Date : 2017-10-28
    Ph. Refait, A.-M. Grolleau, M. Jeannin, E. François, R. Sabot

    Corrosion product layers formed on mild steel coupons after 6 years of permanent immersion at shallow depth in marine sediments were characterized by X-ray diffraction and μ-Raman spectroscopy. They proved mainly composed of FeS which testifies for an intense sulfate-reducing bacteria activity. Other identified compounds were siderite FeCO3 and four varieties of green rust associated with local variations of composition of the environment. The corrosion rates determined by residual thickness measurements were higher on the lower half of the coupons (average 40 μm/yr, local maximum 140 μm/yr) and smaller on the upper half, suggesting that differential aeration effects took place.

    更新日期:2017-10-28
  • Corrosion behaviour of electrodeposited nanocrystalline nickel-iron (NiFe) alloys in dilute H2SO4
    Corros. Sci. (IF 5.245) Pub Date : 2017-10-28
    Leo Monaco, Gordana Avramovic-Cingara, Gino Palumbo, Uwe Erb
    更新日期:2017-10-28
  • 更新日期:2017-10-28
  • Effect of brief thermal aging on stress corrosion cracking susceptibility of LDSS 2101 in the presence of chloride and thiosulphate ions
    Corros. Sci. (IF 5.245) Pub Date : 2017-10-27
    F. Zanotto, V. Grassi, A. Balbo, C. Monticelli, C. Melandri, F. Zucchi

    In this paper, the effect of brief aging within the 650–850 °C temperature range on the resistance of lean duplex stainless steel (LDSS) 2101 to stress corrosion cracking (SCC) was discussed. The thermal aging induced a decrease in Vickers microhardness and an increase in alloy ductility. This behaviour was connected to depletion of interstitial nitrogen in austenite. LDSS 2101 was found to suffer SCC in NACE TM-0177 solution, particularly under specific thermal aging and in the presence of thiosulphate ions (S2O32−) at 10−4 and 10−3 M. Crack nucleation and propagation were linked to microstructural variations connected to thermal aging.

    更新日期:2017-10-28
  • Development of growth and thermal stresses in NiO scale on pure Ni: The metal nanocrystallization effect
    Corros. Sci. (IF 5.245) Pub Date : 2017-10-27
    X. Wei, X. Peng, X. Wang, Z. Dong

    Ni sheet samples with one side normally coarse-grained and the other side nano-grained have been prepared for two-sided oxidation deflection testing. The sample is sharply deflected during heating up to 800 °C in air, because of a significant nano-grain growth. Deflection also occurs during the subsequent isothermal oxidation and cooling, due to the difference in the development of the growth and thermal stresses in the thermally-grown NiO on the nanocrystalline Ni. The latter is interpreted based on the investigation of the Ni nanocrystallization effect on the evolution of the microstructure of the NiO scale with time.

    更新日期:2017-10-27
  • Effects of biogenic H2S on the microbiologically influenced corrosion of C1018 carbon steel by sulfate reducing Desulfovibrio vulgaris biofilm
    Corros. Sci. (IF 5.245) Pub Date : 2017-10-26
    Ru Jia, Jie Long Tan, Peng Jin, Daniel John Blackwood, Dake Xu, Tingyue Gu

    The role of biogenic H2S in the microbiologically influenced corrosion (MIC) of carbon steel was investigated. Desulfovibrio vulgaris (ATCC 7757), a sulfate reducing bacterium, was tested against C1018 carbon steel in anaerobic vials with three different sizes, each filled with 40 mL of ATCC 1249 culture medium, providing headspace volumes of 10 mL, 85 mL and 160 mL, respectively for H2S to escape. Results showed that a larger headspace led to a lower H2S concentration in the culture medium, and this increased the sessile cell count and made the iron sulfide film thinner, resulting in increased MIC.

    更新日期:2017-10-27
  • Corrosion Fatigue and Microstructural Characterisation of Type 316 Austenitic Stainless Steels Tested in PWR Primary Water
    Corros. Sci. (IF 5.245) Pub Date : 2017-10-26
    K. Mukahiwa, F. Scenini, M.G. Burke, N. Platts, D.R. Tice, J.W. Stairmand
    更新日期:2017-10-27
  • Formation of a phosphate conversion coating on bioresorbable Mg-based metallic glasses and its effect on corrosion performance
    Corros. Sci. (IF 5.245) Pub Date : 2017-10-24
    David Miskovic, Katharina Pohl, Nick Birbilis, Kevin J. Laws, Michael Ferry

    Ternary Mg-Zn-Ca metallic glasses show promise as a bioresorbable implant material. Their susceptibility to relatively rapid corrosion rates, however, requires new ways to reduce their initial rate of corrosion post-implantation. To this end, the application of a simple phosphate conversion coating was studied on Mg66Zn30Ca4 to determine the metallic glasses impact on coating development. A model for coating growth is proposed. The results demonstrate corrosion resistance can be improved by an order of magnitude in simulated body fluid, with a significant reduction in anodic kinetics. Furthermore, the mechanical reliability under a compressive load is improved two-fold, despite substrate relaxation due to coating.

    更新日期:2017-10-25
  • Study of stainless steels corrosion in a strong acid mixture. Part 2: Anodic selective dissolution, weight loss and electrochemical impedance spectroscopy tests
    Corros. Sci. (IF 5.245) Pub Date : 2017-10-20
    Tiziano Bellezze, Giampaolo Giuliani, Annamaria Viceré, Gabriella Roventi

    The corrosion resistance of austenitic stainless steels AISI 316L, AISI 904L and Sanicro 28 and duplex stainless steels SAF 2205, SAF 2507 and SAF 2707, was studied at 40 and 60 °C in a strong acid mixture containing tartaric acid saturated solution, H2SO4 and HCl. Anodic selective dissolution, weight loss and electrochemical impedance tests were performed. The results show that all stainless steels corrode actively and the micro-galvanic coupling, present on duplex stainless steels and 316L, determines severe selective corrosion and impairs their tendency to passivate. 904L and Sanicro 28 showed this tendency and the lowest corrosion rates.

    更新日期:2017-10-20
  • Role of previously formed corrosion product layers on sulfide-assisted corrosion of iron archaeological artefacts in soil
    Corros. Sci. (IF 5.245) Pub Date : 2017-10-20
    C. Rémazeilles, D. Neff, J.A. Bourdoiseau, R. Sabot, M. Jeannin, Ph. Refait

    Iron archeological nails (16th century) were used as representative of the mild steel structures envisaged for the storage of nuclear waste. The influence of sulfide species on the corrosion behavior of the nails was investigated via the thorough description of the modifications undergone by the corrosion products surrounding the metal after re-immersion in deaerated sulfide solution. The only observed modification was the formation of FeS at the corrosion product layer/soil interface. The corrosion product layer, mainly composed of FeCO3, acts as protective barrier, the reactivity of FeCO3 preventing sulfide species to reach the metal and influence the corrosion process.

    更新日期:2017-10-20
  • Crystallographic study of hydrogen-induced twin boundary separation in type 304 stainless steel under cyclic loading
    Corros. Sci. (IF 5.245) Pub Date : 2017-10-20
    Shohei Ueki, Yoji Mine, Kazuki Takashima

    This study focused on the martensitic transformation during fatigue crack growth in twinned crystals using small compact-tension specimens to elucidate the hydrogen-induced twin boundary separation in type 304 stainless steel. In the uncharged specimen, martensite variants were formed with their habit planes parallel to the most highly shear-stressed slip plane. The crack extended in martensite that was earlier formed ahead of the crack tip and deflected from the twin boundary. Hydrogen-induced twin boundary separation occurred predominantly at the interface between martensite and austenite in a medium stress intensity range. As the stress intensity range increased, martensite variants symmetrically arranged with respect to the twin plane dominated, suggesting that a slip-off crack growth mechanism was facilitated by hydrogen.

    更新日期:2017-10-20
  • Study of stainless steels corrosion in a strong acid mixture. Part 1: Cyclic potentiodynamic polarization curves examined by means of an analytical method
    Corros. Sci. (IF 5.245) Pub Date : 2017-10-20
    Tiziano Bellezze, Giampaolo Giuliani, Gabriella Roventi

    The corrosion resistance of AISI 316L, AISI 904L, Sanicro 28, SAF 2205, SAF 2507 and SAF 2707 was studied in an acid mixture containing tartaric acid saturated solution, H2SO4 and HCl, as a function of temperature (22–60 °C) and alloys composition. The stainless steels were examined through anodic polarization curves; an analytical method is proposed to obtain the characteristic parameters from these curves. The results indicate that Cr and Mo play the most important role on the active-passive transition of the tested alloys. AISI 904L, Sanicro 28 and SAF 2707 showed the best anodic characteristics among the examined stainless steels.

    更新日期:2017-10-20
  • Smart coating based on double stimuli-responsive microcapsules containing linseed oil and benzotriazole for active corrosion protection
    Corros. Sci. (IF 5.245) Pub Date : 2017-10-20
    Débora Abrantes Leal, Izabel Cristina Riegel-Vidotti, Mário Guerreiro Silva Ferreira, Cláudia Eliana Bruno Marino
    更新日期:2017-10-20
  • A magnetic field induced undulated surface and the shift of the active/passivation transition threshold of iron in a sulfuric acid solution
    Corros. Sci. (IF 5.245) Pub Date : 2017-10-18
    Hongjuan Li, Qi Xiong, Zhanpeng Lu, Junjie Chen, Qian Xiao, Xiangkun Ru, Sichun Lin, Jiarong Ma, Zhen Chen

    An unevenly distributed magnetic field caused irreversible electrochemical states of iron in a sulfuric acid solution due to the undulated surface generated by anodic dissolution. The magnetic field affected the activation-passivation transition threshold by modifying the interface reaction rate and surface morphology. The passivation onset potential was increased by decreasing the scan rate under 0.4 T, and was insensitive to the scan rate at 0 T.

    更新日期:2017-10-19
  • 更新日期:2017-10-18
  • Macrofouling Induced Localized Corrosion of Stainless Steel in Singapore Seawater
    Corros. Sci. (IF 5.245) Pub Date : 2017-10-18
    Daniel J. Blackwood, Chin Sing Lim, Serena L.M. Teo, Hu Xiaoping, Pang Jianjun

    Biofouling induced corrosion of stainless steels grades UNS S31603 and UNS S31254 was investigated at three sites off Singapore for 30 months. No corrosion was observed on grade UNS S31254, while the propensity for corrosion by shellfish of UNS S31603 is ranked as oyster >> barnacles >> green mussels. Oysters caused extensive localised corrosion, penetrating 2 mm thick plates with 12 months with tracks of corrosion several centimetres long.Shallow crevice corrosion was observed under dead barnacles, with an explanation presented for why corrosion is more severe under dead barnacles than live ones. Green mussels did not cause any corrosion.

    更新日期:2017-10-18
  • An experimental and theoretical approach towards understanding the inhibitive behavior of a nitrile substituted coumarin compound as an effective acidic media inhibitor
    Corros. Sci. (IF 5.245) Pub Date : 2017-10-18
    Alper Fitoz, Hasan Nazır, Mehtap Özgür (nee Yakut), Emel Emregül, Kaan C. Emregül
    更新日期:2017-10-18
  • Electrochemistry of CO2 Corrosion of Mild Steel: Effect of CO2 on Iron Dissolution Reaction
    Corros. Sci. (IF 5.245) Pub Date : 2017-10-16
    Aria Kahyarian, Bruce Brown, Srdjan Nesic

    The kinetics of the iron dissolution reaction was investigated in CO2-saturated acidic sodium chloride solutions. While, the effect of CO2 on the iron dissolution reaction during corrosion process has received little attention in the existing literature, the experimental polarization curves obtained in the present study on X65 mild steel suggest that CO2 and/or its related carbonate species are directly involved in the metal dissolution reaction. The presence of CO2 was found to significantly influence the kinetics and the mechanism of the iron dissolution reaction at partial pressures as low as 1 bar. The higher corrosion rates observed in CO2-saurated brines as compared to strong acid solutions at the same pH could possibly be explained by the effect of CO2 on the kinetics of the anodic reaction.

    更新日期:2017-10-17
  • Improved potentiometric SECM imaging of galvanic corrosion reactions
    Corros. Sci. (IF 5.245) Pub Date : 2017-10-16
    D. Filotás, B.M. Fernández-Pérez, J. Izquierdo, A. Kiss, L. Nagy, G. Nagy, R.M. Souto
    更新日期:2017-10-17
  • Phase evolution of EBPVD coated ceria-zirconia nanostructure and its impact on high temperature oxidation of AISI 304
    Corros. Sci. (IF 5.245) Pub Date : 2017-10-13
    Aadhavan R., Parthasarathi Bera, C. Anandan, S. Kannan, K. Suresh Babu
    更新日期:2017-10-13
  • High temperature isothermal oxidation behavior of NbSi2 coating at 1000–1450 °C
    Corros. Sci. (IF 5.245) Pub Date : 2017-10-10
    Young-Jun Choi, Jin-Kook Yoon, Gyeung-Ho Kim, Woo-Young Yoon, Jung-Man Doh, Kyung-Tae Hong

    Isothermal oxidation behavior of NbSi2 coating grown on Nb substrate was investigated in air at 1000–1450 °C. Oxidation rate of NbSi2 coating increased with temperature at 1000–1300 °C but opposite trend was observed at 1300–1450 °C. Maximum oxidation rate was obtained at 1300 °C due to the highest porosity of oxide scale. Lowest oxidation rate was observed at 1450 °C due to formation of dense oxide scale by combined effect of volatilization of Nb oxide phase, viscous flow and densification of c-SiO2. Oxidation resistance of NbSi2 coating at these temperatures was governed by some inter-related factors.

    更新日期:2017-10-10
  • Effect of inclusions modified by rare earth elements (Ce, La) on localized marine corrosion in Q460NH weathering steel
    Corros. Sci. (IF 5.245) Pub Date : 2017-10-05
    Chao Liu, Reynier I. Revilla, Zhiyong Liu, Dawei Zhang, Xiaogang Li, Herman Terryn

    In this work the initial stages of the pitting corrosion in Q460NH weathering steel in a marine environment was studied. To elucidate the effects of inclusions modified by rare earth (RE) elements on pitting corrosion, field emission-scanning electron microscopy-energy dispersive spectrometry (FE-SEM-EDS) analyses, scanning Kelvin probe force microscopy (SKPFM) tests, and a series of immersion tests were conducted. Two main types of inclusions were formed in the steel, and different pit morphologies were observed. The pitting corrosion was initiated by the dissolution of (RE)2O2S-(RE)xSy in both types of inclusions due to the lower potential of this phase compared to the matrix, which indicated that the inclusions in the Q460NH weathering steel had a lower pitting corrosion resistance than the matrix.

    更新日期:2017-10-05
  • Eco Friendly Green Inhibitor Gum Arabic (GA) for the Corrosion Control of Mild Steel in Hydrochloric Acid Medium
    Corros. Sci. (IF 5.245) Pub Date : 2017-10-05
    Khalil Azzaoui, Emiloud Mejdoubi, Shehdeh Jodeh, Abdellatif Lamhamdi, Enrique Rodriguez-Castellón, Manuel Algarra, Abdelkader Zarrouk, Abderrazak Errich, Rachid Salghi, Hassane Lgaz

    Gum Acacia (GA) was evaluated for steel inhibition in acidic medium. Weight loss, EIS, and by polarization potentiodynamic curves were used to test it. GA showed a high efficiency in protecting steel from acid, and found as dependent on its concentration (1.0 g/L). AFM allowed comparing the morphology of steel with GA, which was complemented with XPS spectroscopy, which confirmed the complete adsorption of GA by evaluating the surface film composition. Polarization resistance increases when GA concentration does, based on EIS characterization, indicating the formation of a protective layer whereas PDP results showed that, GA behaves as a mixed-type inhibitor.

    更新日期:2017-10-05
  • 1,2,3-Triazole derivatives as corrosion inhibitors for mild steel in acidic medium: Experimental and computational chemistry studies
    Corros. Sci. (IF 5.245) Pub Date : 2017-10-04
    Qi Ma, Sijun Qi, Xiaohong He, Yongming Tang, Gang Lu

    (1-Benzyl-1H-1,2,3-triazole-4-yl)methanol (BTM) and (1-(pyridin-4-ylmethyl)-1H-1,2,3- triazole-4-yl)methanol (PTM) were prepared and investigated as corrosion inhibitors for mild steel in 1.0 M HCl. It is found that PTM functions as more effective inhibitor than BTM in the concentration range of 0.2 −1.0 mM. Computational chemistry studies show that the triazole derivatives can adsorb on the mild steel surface by sharing the lone pair electrons of N atoms with iron atoms or by accepting electrons from iron surfaces. Due to its strong interaction with the mild steel surface in aqueous system, the pyridine segment should be responsible for the higher inhibition efficiency of PTM.

    更新日期:2017-10-04
  • Fabricating an epoxy composite coating with enhanced corrosion resistance through impregnation of functionalized graphene oxide-co-montmorillonite Nanoplatelet
    Corros. Sci. (IF 5.245) Pub Date : 2017-09-28
    Morteza Ganjaee Sari, Mohammad Shamshiri, Bahram Ramezanzadeh

    This study aims at developing an epoxy-based nanocomposite coating with enhanced corrosion protection properties employing different mixtures of graphene oxide (GO) and Cloisite 20A montmorillonite (MMT) nanoclay (NC) particles functionalized with aminosilane and 1,4-butanediol diglycidyl ether (BDDE) molecules. The effects of modified NC (MNC), modified GO (MGO) and various mixtures of MNC-MGO on the corrosion resistance of epoxy coating were studied. Results revealed the enhancement of surface modified GO and NC particles stability in the epoxy matrix. It was also revealed that the mixture of MNC-MGO (30:70%w/%w) resulted in the highest improvement of the epoxy coating corrosion resistance.

    更新日期:2017-09-29
  • Simultaneous oxidation and carburization of a Fe-9Cr alloy under different oxygen pressures at 800 °C
    Corros. Sci. (IF 5.245) Pub Date : 2017-09-27
    J. Shen, S. Liu, X.H. Guo, Y. Niu

    A model Fe-9Cr alloy was exposed to various H2 single bond CO2 single bond CH4 mixtures providing different oxygen pressures and carbon activities at 800 °C. Three oxidation modes and three oxygen pressure ranges have been observed. At low pressures (Range I) only thin external Cr2O3 scales formed. An intermediate range (Range II) produced an internal precipitation of Cr2O3 and Cr carbide without an external scale. Higher pressures (Range III) produced external FeOx scales plus an internal oxidation of Cr. Two critical oxygen pressures for the transitions between the three oxidation modes were observed and also calculated in reasonable agreement with the experimental results.

    更新日期:2017-09-29
  • Early oxidation mechanism of austenitic stainless steel TP347H in supercritical water
    Corros. Sci. (IF 5.245) Pub Date : 2017-09-23
    Yanhui Li, Shuzhong Wang, Panpan Sun, Donghai Xu, Mengmeng Ren, Yang Guo, Guike Lin
    更新日期:2017-09-29
  • Microstructure of localized corrosion front on Mg alloys and the relationship with hydrogen evolution
    Corros. Sci. (IF 5.245) Pub Date : 2017-09-21
    Peng-Wei Chu, Etienne Le Mire, Emmanuelle A. Marquis

    Actively propagating localized corrosion fronts on pure Mg, Mg-Zn-Ca-Mn, and Mg-Y alloys in NaCl aqueous solutions were investigated by site-specific characterization techniques. Regardless of alloy microstructure and polarization conditions, rising streams of hydrogen bubbles were observed predominantly at the propagating corrosion fronts. Localized corrosion propagated inside the alloys, underneath a surface corrosion film, and exhibited a finger-like morphology at the corrosion region/alloy interface. Hydrogen evolution was found to be related to the formation of corrosion products and followed local anodic dissolution of Mg. Localized corrosion morphology strongly varied with the underlying Mg alloy microstructure and chemistry.

    更新日期:2017-09-21
  • The mechanism of stress corrosion cracking of Alloy 690TT in a caustic solution containing lead
    Corros. Sci. (IF 5.245) Pub Date : 2017-09-20
    Qiang Hou, Zhiyong Liu, Chengtao Li, Xiaogang Li

    This study investigated the PbSCC of Alloy 690TT exposed to a caustic solution at 320 °C. Characterization of the resulting films indicates that lead is involved in the formation of oxides and evenly distributed in the films. TEM analysis was carried out to elucidate the role of lead in IGSCC by investigating the oxides at the crack tip. Lead penetrates into the crack tip and disperses in the intergranular oxides, enhancing the oxidation of grain boundaries. Thus, microcracks initiate within oxides under stress and connect with the main SCC crack stemming from the pit, resulting in propagation of the IGSCC.

    更新日期:2017-09-20
Some contents have been Reproduced with permission of the American Chemical Society.
Some contents have been Reproduced by permission of The Royal Society of Chemistry.
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