Passivation Behavior and Surface Chemistry of 2507 Super Duplex Stainless Steel in Acidified Artificial Seawater Containing Thiosulfate

Cui, Zhongyu; Chen, Shuangshuai; Wang, Liwei; Cheng, Ming; Li, Yong; Wu, Junsheng; Wang, Xin; Chen, Shougang; Liu, Xiaogang

doi:10.1149/2.1901713jes

Cited by 53 publications

(21 citation statements)

References 77 publications

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“…The use of a CPE instead of an ideal capacitor is owing to the distribution of the relaxation times associated with heterogeneities (including surface defects and roughness) at the surface of the electrodes. 29,33 The Nyquist plots of 304 SS (Figure 6a,b) and Zr 2 N 2 O/SS (Figure 6c,d) display similar trends. At 0.9 V, both samples exhibit a large capacitance.…”

Section: Effect Of Ctps On Impedancementioning

confidence: 73%

Zr₂N₂O Coating-Improved Corrosion Resistance for the Anodic Dissolution Induced by Cathodic Transient Potential

Wang

Luo

Muneshwar

et al. 2018

ACS Appl. Mater. Interfaces

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Developing a corrosion-resistant and electrically conductive coating on metallic bipolar plates is essential to mitigate the performance degradation induced by the high cathodic transient potentials (CTPs) in the start-up/shut-down (SU/SD) processes of polymer electrolyte membrane fuel cells (PEMFCs). Herein, a zirconium oxynitride (Zr2N2O) coating prepared by atomic layer deposition was used to improve the corrosion resistance of 304 stainless steel (304 SS) toward anodic dissolution at various CTPs. Triangular potential pulses were applied to the specimens to simulate potential variations at the cathode side of the PEMFCs at SU/SD stages. Results show that the Zr2N2O coating can provide effective protection at a CTP as positive as 1.1 V versus Ag/AgCl. At all CTPs examined, the peak current density (i peak) extracted from the pulse test of the coated specimen (Zr2N2O/SS) is 2 orders of magnitude lower than that of uncoated 304 SS, indicating that the presence of the Zr2N2O coating remarkably increases the corrosion resistance for the anodic dissolution induced by CTPs. More importantly, upon increasing the CTPs, 304 SS experiences severe intergranular corrosion after 4050 pulses, whereas Zr2N2O/SS shows slight pitting corrosion. The quite low i peak and the mitigated corrosion morphologies of Zr2N2O/SS confirm that incorporating oxygen into the protective coating for achieving a high oxidation resistance is a feasible way to restrain the anodic dissolution caused by high CTPs. Analysis of the electron energy level diagrams of the passive film suggests a protective coating with a wider valence band contributing to the improved corrosion resistance toward the transpassive dissolution.

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Section: Effect Of Ctps On Impedancementioning

confidence: 73%

Zr₂N₂O Coating-Improved Corrosion Resistance for the Anodic Dissolution Induced by Cathodic Transient Potential

Wang

Luo

Muneshwar

et al. 2018

ACS Appl. Mater. Interfaces

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“…It can be seen from the positive slope that the passive film on the surface of TA2 exhibits n-type semiconductor characteristics, and the structure of the passive film has oxygen vacancies or metal cation defects [37,38]. The relationship between the space-charge capacitance and applied potential can be expressed by the following equation [37,39]:…”

Section: Electrochemical Characteristicsmentioning

confidence: 99%

Effect of pH on the Corrosion and Repassivation Behavior of TA2 in Simulated Seawater

et al. 2021

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The effect of pH on the corrosion and repassivation behavior of TA2 in simulated seawater was studied using electrochemical tests, immersion experiments, and surface morphology topology analysis. The results show that Ecorr and Rf increased while ipass and weight loss rate decreased as the pH of simulated seawater increased. The TA2 passive film was determined to be mainly composed of a large amount of TiO2 and a small amount of TiO. The repassivation function of TA2 can be expressed as E = −0.1375 + 0.0532ln(t − 1.241) for a simulated seawater pH of 8.2. The parameter b, which represents the slope of the potential–time curve during the friction electrode test, was used to evaluate the repassivation behavior of TA2. The increase in pH value was observed to promote the repassivation speed of the passive film, which is beneficial to the corrosion resistance of TA2.

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“…It means that the higher the seawater depth is, the more defects the film has. Cui et al [25] indicated that the defects had high energy and high activity, which facilitated the anodic dissolution. Consequently, the stability and corrosion resistance of the preformed passive film decrease.…”

Section: Mott-schottky Analysismentioning

confidence: 99%

Electrochemical Performance of Passive Film Formed on Ti–Al–Nb–Zr Alloy in Simulated Deep Sea Environments

Dong

Fan

Zhang

et al. 2019

Acta Metall. Sin. (Engl. Lett.)

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Titanium alloy Ti-Al-Nb-Zr has high specific strength and becomes a promising structural material used in the deep sea. The excellent corrosion resistance of the alloy is derived from the protective passive film formed on its surface. By now, full agreement on interpretation of the anti-corrosion performance of the film in marine environment, especially in the deep sea, has not been reached. In this work, the electrochemical performance of two-surface-state Ti-Al-Nb-Zr alloys which are treated by mechanical polishing and anodizing pre-passivation in the simulated shallow sea, 1000 m and 3000 m deep sea environments, is investigated. By interpreting the electrochemical kinetic parameters, it is found that the dominant cathodic process becomes hydrogen evolution in simulated deep sea environments, but the reduction rate is restrained by high hydrostatic pressure, which arrests the passivation of the alloy. Assisted by X-ray photoelectron spectroscopy analysis, it is found that the passive film mainly consists of titanium oxides. There are intermediate oxides with non-stoichiometric ratio involved in the film formation due to the low dissolved oxygen concentration and low temperature. The results of Mott-Schottky and electrochemical impedance show that the film has n-type semiconducting property with oxygen vacancies as the main point defects. The anti-corrosion performance in simulated deep sea environments is one order of magnitude lower than that in the simulated shallow sea environment. However, from 1000 to 3000 m, the corrosion resistance is reduced very slightly. In the inner layers of the passive film and the passive film formed in simulated deep sea environments, the proportion of lowvalence titanium oxides is relatively high. The doping of low-valence titanium (Ti(II) or Ti(III)) results in a porous structure and ion permeability of the passive film, as well as relatively low corrosion resistance.

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Passivation Behavior and Surface Chemistry of 2507 Super Duplex Stainless Steel in Acidified Artificial Seawater Containing Thiosulfate

Cited by 53 publications

References 77 publications

Zr₂N₂O Coating-Improved Corrosion Resistance for the Anodic Dissolution Induced by Cathodic Transient Potential

Zr₂N₂O Coating-Improved Corrosion Resistance for the Anodic Dissolution Induced by Cathodic Transient Potential

Effect of pH on the Corrosion and Repassivation Behavior of TA2 in Simulated Seawater

Electrochemical Performance of Passive Film Formed on Ti–Al–Nb–Zr Alloy in Simulated Deep Sea Environments

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Passivation Behavior and Surface Chemistry of 2507 Super Duplex Stainless Steel in Acidified Artificial Seawater Containing Thiosulfate

Cited by 53 publications

References 77 publications

Zr2N2O Coating-Improved Corrosion Resistance for the Anodic Dissolution Induced by Cathodic Transient Potential

Zr2N2O Coating-Improved Corrosion Resistance for the Anodic Dissolution Induced by Cathodic Transient Potential

Effect of pH on the Corrosion and Repassivation Behavior of TA2 in Simulated Seawater

Electrochemical Performance of Passive Film Formed on Ti–Al–Nb–Zr Alloy in Simulated Deep Sea Environments

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Zr₂N₂O Coating-Improved Corrosion Resistance for the Anodic Dissolution Induced by Cathodic Transient Potential

Zr₂N₂O Coating-Improved Corrosion Resistance for the Anodic Dissolution Induced by Cathodic Transient Potential