The Formation of Passive Films of Carbon Steel in Borate Buffer and Their Degradation Behavior in NaCl Solution by SECM

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	The Formation of Passive Films of Carbon Steel in Borate Buffer and Their Degradation Behavior in NaCl Solution by SECM
	Y. Xia; F. H. Cao; W. J. Liu; L. R. Chang; J. Q. Zhang
	2013
发表期刊	International Journal of Electrochemical Science
ISSN	1452-3981
卷号	8 期号:2 页码:3057-3073
摘要	Passive films formed on carbon steel by different passivation potentials in borate buffer solution and their degradation behavior were studied by different electrochemical techniques, such as electrochemical impedance spectroscopy (EIS), Mott-Schottky (M-S) analysis and scanning electrochemical microscopy (SECM). The film's composition was investigated by X-Ray Photoelectron Spectroscopy (XPS). The results of SECM show that the electrochemical reactivity on the surface of passive film is weakened as the film formation potential increases due to slower charge transfer rate. The heterogeneous electron transfer rate constant k calculated from approach curves decreases linearly with substrate potential increasing, resulting from different electrochemical reactivity on the surface of substrate. The electrochemical reaction resistance of the film increases with film formation potential increasing, while the point defect density decreases, indicating the film becomes less conductive. The ratio Fe3+/Fe2+ and the percentage of oxyhydroxide species increase simultaneously as the film formation potential shifts from -0.1 V to 0.7 V. The SECM and EIS results show that the film formed at 0.3 V has the strongest corrosion resistance in 0.1 M NaCl solution followed by that of 0.7 V which is more defective and porous. The degradation of passive film in NaCl solution is different from the evolution of films in non-aggressive electrolyte.
部门归属	[xia, yan ; cao, fahe ; liu, wenjuan ; chang, linrong ; zhang, jianqing] zhejiang univ, dept chem, hangzhou 310027, peoples r china. [zhang, jianqing] chinese acad sci, state key lab corros & protect, inst met res, shenyang 110016, peoples r china. ; xia, y (reprint author), zhejiang univ, dept chem, hangzhou 310027, peoples r china. ; nelson_cao@zju.edu.cn
关键词	Secm Carbon Steel Passive Film Eis Degradation Xps Scanning Electrochemical Microscopy Heterogeneous Electron-transfer Imaging Concentration Profiles Austenitic Stainless-steel Point-defect Model Localized Corrosion Pitting Corrosion Oxide Layer In-situ Iron
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语种	英语
文献类型	期刊论文
条目标识符	http://ir.imr.ac.cn/handle/321006/71590
专题	中国科学院金属研究所
推荐引用方式 GB/T 7714	Y. Xia,F. H. Cao,W. J. Liu,et al. The Formation of Passive Films of Carbon Steel in Borate Buffer and Their Degradation Behavior in NaCl Solution by SECM[J]. International Journal of Electrochemical Science,2013,8(2):3057-3073.
APA	Y. Xia,F. H. Cao,W. J. Liu,L. R. Chang,&J. Q. Zhang.(2013).The Formation of Passive Films of Carbon Steel in Borate Buffer and Their Degradation Behavior in NaCl Solution by SECM.International Journal of Electrochemical Science,8(2),3057-3073.
MLA	Y. Xia,et al."The Formation of Passive Films of Carbon Steel in Borate Buffer and Their Degradation Behavior in NaCl Solution by SECM".International Journal of Electrochemical Science 8.2(2013):3057-3073.