|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
|Source Publication||International Journal of Electrochemical Science
|Abstract||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.|
; 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.
Scanning Electrochemical Microscopy
Imaging Concentration Profiles
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.
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.
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.
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