Scanning electrochemical microscopy study on the electrochemical behavior of CrN film formed on 304 stainless steel by magnetron sputtering

被引：62

作者：

Gao, Shujun ^{[1
]}

Dong, Chaofang ^{[1
]}

Luo, Hong ^{[2
]}

Xiao, Kui ^{[1
]}

Pan, Xiaoming ^{[1
]}

Li, Xiaogang ^{[1
]}

机构：

[1] Univ Sci & Technol Beijing, Inst Adv Mat & Technol, Ctr Corros & Protect, Beijing 100083, Peoples R China

[2] Hohai Univ, Coll Mech & Mat, Nanjing 210098, Jiangsu, Peoples R China

来源：

ELECTROCHIMICA ACTA | 2013年 / 114卷

基金：

中国国家自然科学基金;

关键词：

CrN; SECM; Redox competition mode; Electrochemical behavior; 316L STAINLESS-STEEL; MEMBRANE FUEL-CELLS; BIPOLAR PLATES; GALVANIC CORROSION; IMPEDANCE SPECTROSCOPY; ALKALINE-SOLUTIONS; COATED STEELS; THIN-FILMS; SINGLE PIT; IN-SITU;

D O I：

10.1016/j.electacta.2013.10.009

中图分类号：

O646 [电化学、电解、磁化学];

学科分类号：

081704 ;

摘要：

The electrochemical behavior of CrN film formed on 304 stainless steel (304 SS) by magnetron sputtering was investigated by scanning electrochemical microscopy (SECM) in redox competition mode and X-ray photoelectron spectroscopy (XPS) in 0.2 M H3BO3 + 0.05 M Na2B4O7 (pH = 8.4) buffer solution containing 3.5 wt% NaCl. The results demonstrated that passive film could form on the surface of CrN film with the chemical compositions of Cr, Cr2O3, CrN, Cr(OH)(3), and CrO3. When applied with 0.9 vs SCE/V potential, the pitting propagation sites corresponded to the high oxygen consumption region. While above stable pit, the Pt microelectrode showed an enhanced faradic current. Separated anodes and cathodes were observed in the scratch, which suggested that the dominant corrosion mechanism is pitting corrosion induced and promoted by galvanic corrosion. These results provide a more explicit description of the corrosion mechanism and processes of CrN film. (C) 2013 Elsevier Ltd. All rights reserved.

引用

页码：233 / 241

页数：9

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