Long-term anticorrosion behaviour of polyaniline on mild steel

被引：170

作者：

Chen, Y. ^{[1
]}

Wang, X. H. ^{[1
]}

Li, J. ^{[1
]}

Lu, J. L. ^{[1
]}

Wang, F. S. ^{[1
]}

机构：

[1] Chinese Acad Sci, Changchun Inst Appl Chem, State Key Lab Polymer Phys & Chem, Changchun 130022, Peoples R China

来源：

CORROSION SCIENCE | 2007年 / 49卷 / 07期

基金：

中国国家自然科学基金;

关键词：

electronic materials; mild steel; EIS; alkaline corrosion; polymer coatings;

D O I：

10.1016/j.corsci.2006.11.007

中图分类号：

T [工业技术];

学科分类号：

08 [工学];

摘要：

Anticorrosion performances of polyaniline emeraldine base/epoxy resin (EB/ER) coating on mild steel in 3.5% NaCl solutions of various pH values were investigated by electrochemical impedance spectroscopy (EIS) for 150 days. In neutral solution (pH 6.1), EB/ER coating offered very efficient corrosion protection with respect to pure ER coating, especially when EB content was 5-10%. The impedance at 0.1 Hz of the coating increased in the first 1-40 immersion days and then remained constant above 10(9) Omega cm(2) until 150 days, which in combination with the observation of a Fe2O3/Fe3O4 passive film formed on steel confirmed that the protection of EB was mainly anodic. In acidic or basic solution (pH 1 or 13), EB/ER coating also performed much better than pure ER coating. However, these media weakened the corrosion resistance due to breakdown of the passive film or deterioration of the ER binder. (C) 2007 Published by Elsevier Ltd.

引用

页码：3052 / 3063

页数：12

共 26 条

[1]

Application of electrochemical impedance spectroscopy to study the degradation of polymer-coated metals [J].