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Electrochemical Hydrogen Charging on Corrosion Behavior of Ti-6Al-4V Alloy in Artificial Seawater

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Chinese Journal of Mechanical Engineering 2024年第1期37卷 296-308页

作者： Yanxin Qiao Yue Qin Huiling Zhou Lanlan Yang Xiaojing Wang Zhengbin Wang Zhenguang Liu Jiasheng Zou School of Materials Science and Engineering Jiangsu University of Science and TechnologyZhenjiang 212003China Yangzhou Changelight Co. LtdYangzhou 225012China CAS Key Laboratory of Nuclear Materials and Safety Assessment Institute of Metal ResearchChinese Academy of SciencesShenyang 110016China

This study employs advanced electrochemical and surface characterization techniques to investigate the impact of electrochemical hydrogen charging on the corrosion behavior and surface film of the Ti-6Al-4V alloy.The findings revealed the formation ofγ-TiH andδ-TiH_(2) hydrides in the alloy after hydrogen charging.Prolonging hydrogen charging resulted in more significant degradation of the alloy microstructure,leading to deteriorated protectiveness of the surface film.This trend was further confirmed by the electrochemical measurements,which showed that the corrosion resistance of the alloy progressively worsened as the hydrogen charging time was increased.Consequently,this work provides valuable insights into the mechanisms underlying the corrosion of Ti-6Al-4V alloy under hydrogen charging conditions.

关键词： Ti-6Al-4V alloy Hydrogen charging Electrochemical corrosion passive film

Unveiling the Contribution of Lactic Acid to the Passivation Behavior of Ti-6Al-4V Fabricated by Laser Powder Bed Fusion in Hank’s Solution

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Acta Metallurgica Sinica(English Letters) 2024年第1期37卷 102-118页

作者： Yu-Hang Chu Liang-Yu Chen Bo-Yuan Qin Wenbin Gao Fanmin Shang Hong-Yu Yang Lina Zhang Peng Qin Lai-Chang Zhang School of Materials Science and Engineering Jiangsu University of Science and TechnologyZhenjiang212100China Foshan(Southern China)Institute for New Materials Foshan528200China Key Laboratory of Automobile Materials Ministry of Education and Department of Materials Science and EngineeringJilin UniversityChangchun130025China Centre for Advanced Materials and Manufacturing School of EngineeringEdith Cowan University270 Joondalup DriveJoondalupPerthWA6027Australia

In actual physiological environments,bacteria can activate the immune system and release lactic acid.However,the detailed contribution of lactic acid to the passivation behavior of titanium(Ti)alloys is still unclear.The current work investigated the in vitro passivation behavior of Ti-6Al-4V(TC4)alloys fabricated by laser powder bed fusion in Hank's solution with and without adding lactic acid.Electrochemical methods,inductively coupled plasma atomic emission spectrometer,and X-ray photoelectron spectroscopy were jointly used.Adding lactic acid decreases the corrosion resistance of samples by degrading the formed passive film.The film formed in the(lactic acid)-containing solution exhibits a higher level of oxygen vacancies and a lower thickness,attributed to the suppressed formation of Ti^(4+)transformed from Ti^(3+)and Ti^(2+).Moreover,the presence of lactic acid would increase the open circuit potential,relieve the ions release,and hinder the deposition of calcium phosphates within 24 h immersion.

关键词： Titanium alloy Corrosion behavior passive film Lactic acid Laser powder bed fusion

Dissolution and repair of passive film on Cu-bearing 304L stainless steels immersed in H_2SO_4 solution

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Journal of Materials Science & Technology 2018年第11期34卷 2149-2159页

作者： Xinrui Zhang Jinlong Zhao Tong Xi M.Babar Shahzad Chunguang Yang Ke Yang School of Materials Science and Engineering University of Science and Technology of China Institute of Metal Research Chinese Academy of Sciences

The antibacterial Cu-bearing 304 L stainless steel is a new kind of structural and functional integrated metal material. In this work, evolution behavior of passive film of different heat treated Cu-bearing 304 L stainless steel immersed in 0.5 M H2SO4 solution was investigated by using electrochemical measurements, atomic force microscopy（AFM） observation and X-ray photoelectron spectroscopy（XPS） analysis.The results show that the solution and aging treated samples have the similar polarization behaviors. The passive film impedance experiences an initial decrease within 7 days followed by a subsequent increase,while the defect density of passive film presents the opposite trend. Meanwhile, the evolution of surface morphology and the estimated thickness of the passive film confirm that it experiences initial dissolution and follow-up repair. Furthermore, the Cr^3＋ content in passive film undergoes sequential reduction to increase, however the variation tendency of Cu^2＋ content is just opposite, indicating that the content variation of Cr and Cu in passive film reflects the competitive process of film dissolution and repair. In addition, compared with solution treated samples, aged samples have a bigger icorrvalue and the rougher passive film. This indicates that the passive film of solution treated steel is more compact and stable.

关键词： Cu-bearing stainless steel 304L-Cu passive film

Study on the passive film formed on 2205 stainless steel in acetic acid by AAS and XPS

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International Journal of Minerals,Metallurgy and Materials 2009年第2期16卷 170-176页

作者： Xue-qun Cheng Xiao-gang Li Chao-fang Dong Corrosion and Protection Center University of Science and Technology Beijing Beijing 100083 China

The properties of the passive film formed on 2205 stainless steel in acetic acid at high temperature that contained chloride ions were studied by atomic absorption spectrometry （AAS）, X-ray photoelectron spectroscopy （XPS）, and electrochemical polarization measurements. AAS results show that molybdenum is enriched on the surface as the passive film is dissolved. This enrichment decreases the corrosion resistance because it hinders chloride adsorption and Fe ion dissolution, and acts as a local pH buffer because it consumes protons. The dissolution ratio of Fe/Cr is approximately 10 during the active dissolution of the passive film. XPS results indicate that when the potential is in the passivation region, Cr comprises about 50% of the metal cations in the near-surface region of the passive film and is the main metal constituent in this region. When the polarization potential is much greater than the transpassivation potential, the Mo content accounts for approximately 45% of the metal cations in the nearurface region; Fe and Ni have no obvious influence on the formation, dissolution, or puncture of the passive film.

关键词： acetic acid corrosion electrochemical behavior stainless steel passive film

Stability of passive film and antibacterial durability of Cu-bearing L605 alloy in simulated physiological solutions

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Rare Metals 2021年第5期40卷 1126-1133页

作者： Peng-Fei Geng Jin-Long Zhao Tong Xi Chun-Guang Yang Ke Yang School of Nano Science and Technology Institute University of Science and Technology of ChinaSuzhou 215300China Institute of Metal Research Chinese Academy of SciencesShenyang 110016China

In this work,the stability of passive film for long-time immersed Cu-bearing L605(L605-Cu) alloy in the phosphate buffer solution(PBS) was studied by potentiodynamic polarization and electrochemical impedance spectroscopy.The results showed that the impedance of passive film for L605-Cu alloy experienced an initial increase and subsequent stabilization with the increase in the immersion time.In addition,the plate count method was employed to assess the antibacterial durability of L605-Cu alloy against Escherichia coli after long-time immersion.The results indicated that the antibacterial rate of L605-Cu alloy presented a declining tendency with the immersion time prolonging.X-ray photoelectron spectroscopy(XPS) was used to analyze the change of the chemical composition in the passive film on L605-Cu alloy immersed in the PBS for different time.The results showed that Cu content and its compounds in the passive film gradually increased with the immersion time prolonging,hinting declined activity of Cu ions penetrating into the passive film,which resulted in a decrease in the antibacterial performance.

关键词： L605-Cu alloy passive film Antibacterial rate Implant

Effects of W Addition on the Electrochemical Behaviour and passive film Properties of Fe-Based Amorphous Alloys in Acetic Acid Solution

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Acta Metallurgica Sinica(English Letters) 2018年第10期31卷 1098-1108页

作者： Dan-Dan Liang Xian-Shun Wei Chun-Tao Chang Jia-Wei Li Yong Wang Xin-Min Wang Jun Shen School of Materials Science and Engineering Tongji University Key Laboratory of Magnetic Materials and Devices Ningbo Institute of Materials Technology and Engineering Chinese Academy of Sciences Zhejiang Province Key Laboratory of Magnetic Materials and Application Technology Ningbo Institute of Materials Technology and Engineering Chinese Academy of Sciences School of Mechanical Science and Engineering Northeast Petroleum University

The electrochemical behaviour and passive film properties of Fe-Cr-Mo-W-C-B-Y amorphous alloys in acetic acid solution were investigated. The potentiodynamic polarisation and Nyquist curves demonstrated that W addition signifi- cantly enhanced the corrosion resistance. Mott-Schottky plots and angle-resolved X-ray photoelectron spectra indicated that passive films with different W contents exhibited dipolar （p-n） semiconducting characteristics separated by fiat-band potentials. The outer and inner oxide layers of the passive films were modified by reducing the acceptor and donor densities. Moreover, W addition favoured the formation of a thicker and more stable passive film to inhibit the dissolution of alloy elements.

关键词： Amorphous alloy XPS Mott-Schottky measurement passive film Semiconducting property Chemical ingredient

Effect of microstructure and passive film on corrosion resistance of 2507 super duplex stainless steel prepared by different cooling methods in simulated marine environment

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International Journal of Minerals,Metallurgy and Materials 2020年第8期27卷 1100-1114页

作者： Min Zhu Qiang Zhang Yong-feng Yuan Shao-yi Guo School of Mechanical Engineering&Automation Zhejiang Sci-Tech UniversityHangzhou 310018China National and Local Joint Engineering Research Center of Reliability Analysis and Testing for Mechanical and Electrical Products Zhejiang Sci-Tech UniversityHangzhou 310018China

The effect of microstructure and passive film on the corrosion resistance of 2507 super duplex stainless steel(SDSS)in simulated marine environment was investigated by electrochemical measurements,periodic wet–dry cyclic corrosion test,scanning Kelvin probe force microscopy,atomic force microscopy,and X-ray photoelectron spectrometry.The results show that the occupation ratio ofγphase increases with the decrease in cooling rate,whereas the content ofαphase reduces gradually.In addition,theσprecipitated phase only emerges in the annealed steel.The pitting sensitivity and corrosion rate of 2507 SDSS reduce first and then increase as the cooling rate decreases.Theσprecipitated phase drastically reduces the protective ability of the passive film and facilitates micro-galvanic corrosion of the annealed steel.For various microstructures,the pits are preferentially distributed within theσandγphases.The corrosion resistance of 2507 SDSS prepared by different cooling methods is closely related to the microstructure and structure(stability and homogeneity)of the passive film.Normalized steel shows an optimal corrosion resistance,followed by the quenched and annealed steels.

关键词： stainless steel microstructure corrosion resistance passive film

Monitoring the Diffusion Layer During passive film Breakdown on Alloy 800 with Digital Holography

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Acta Metallurgica Sinica(English Letters) 2015年第9期28卷 1170-1174页

作者： Da-Hai Xia Jing-Li Luo Zhi-Ming Gao Bo-Yu Yuan Liang Li Chao Wang Tianjin Key Laboratory of Composite and Functional Materials Tianjin University School of Materials Science and Engineering Tianjin University Department of Chemical and Materials Engineering University of Alberta School of Physics and Electronic Engineering Jiangsu Normal University School of Chemistry and Chemical Engineering Jiangsu Normal University

The effects of chloride and thiosulfate ions on localized corrosion of alloy 800 are investigated through dynamical observation of the change in phase image of the diffusion layer during passive film breakdown using digital holography. The results indicate that solution chemistry has a significant effect on film breakdown and diffusion layer. The phase distribution changes at different applied potentials show that in the process of film breakdown, dissolution of metal ions from pitting is not remarkable in chloride-only solution, whereas dissolution of metal ions is significantly high in thiosulfate and chloride solution. Thiosulfate has a combined effect with chloride ions in passive film degradation.

关键词： passive film Breakdown Diffusion layer Digital holography Alloy 800

Influence of Cr on the Electronic Properties of passive film on B30 Alloy in NaOH Solution

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Chemical Research in Chinese Universities 2015年第4期31卷 603-610页

作者： SHANG Yongbin XIAO Shuqin QIU Xiaolin WEI Yarning Xi'an Changqing Technology & Engineering Co. Ltd. Xi'an 710018 P R. China Oil & Gas Technology Institute Changqing Oil Field Company Xi'an 710018 P R. China National Engineering Laboratory for Exploration and Development of Low-permeability Oil & Gas Fields Xi'an 710018 P R. China

The influence of Cr on the electronic properties of the passive film on B30 alloy in NaOH solution was studied via electrochemical impedance spectra（EIS）, potentiodynamic curve and Mott-Schottky plot. The Cr doped in the passive film on B30 alloy was detected by X-ray photoelectron spectroscopy（XPS）. XPS results show that Cr203 appeared on the passive film, which implied the enhanced anti-corrosion of B30 alloy. The passive film showed a p-type semi-conductive character. The acceptor density（NA） was in an order of magnitude of 1022 cm-3, and NA de- creased with the increment of Cr. EIS results show that the film resistance（Rf） increased with increasing the amount of Cr. The diffusion coefficient（D0） was calculated to be in a range of 10^-16---10^-17 cm-2/s on the basement of point defect modcl（PDM）.

关键词： Electrochemcal impedance spectrum X-Ray photoelectron spectroscopy passive film