A study on mechanism of corrosion protection of polyaniline coating and its failure

被引：141
作者：
Fang, Jianjun [1 ]
Xu, Ke [1 ]
Zhu, Lihua [1 ]
Zhou, Zhixiong [1 ]
Tang, Heqing [1 ]
机构：
[1] Huazhong Univ Sci & Technol, Dept Chem & Chem Engn, Wuhan 430074, Peoples R China
来源：
CORROSION SCIENCE | 2007年 / 49卷 / 11期
关键词：
polyaniline; stainless steel; corrosion; electrodeposited films; galvanic coupling;
D O I：
10.1016/j.corsci.2007.05.017
中图分类号：
T [工业技术];
学科分类号：
08 ;
摘要：
Polyaniline (PANI) coatings were electrochemically deposited on substrates of stainless steel and platinum in solutions of 0.2 M H2SO4 and 0.1 M aniline by cyclic voltammetry. The corrosion protection of the PANI coatings and their failure were investigated in 0.2 M H2SO4 solution. It was observed that the corrosion protection ability of the coating to steel substrate was increased with the increase of the coating thickness. The corrosion protection ability was mainly attributed to the passivating effect of PANI due to its oxidizing ability in its emeraldine state. During its operation, the PANI coating in emeraldine state tended to gradually lose its corrosion protection ability. This gradual failure of the PANI coating, but faster than expected, was confirmed to be related to a gradual reduction of the emeraldine PANI and a gradually increased resistance between the PANI coating and the stainless steel substrate. These findings lead to a new mechanism for the corrosion protection of PANI coating and its failure. (c) 2007 Elsevier Ltd. All rights reserved.
引用
收藏
页码：4232 / 4242
页数：11
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