Polyaniline for corrosion prevention of mild steel coupled with copper

被引：37

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：

ELECTROCHIMICA ACTA | 2007年 / 52卷 / 17期

基金：

中国国家自然科学基金;

关键词：

mild steel; copper; galvanic corrosion; polyaniline; electrochemical impedance spectroscopy;

D O I：

10.1016/j.electacta.2007.02.057

中图分类号：

O646 [电化学、电解、磁化学];

学科分类号：

081704 ;

摘要：

Polyaniline emeraldine base/epoxy resin (EB/ER) coating was investigated for corrosion protection of mild steel coupled with copper in 3.5% NaCl solution. EB/ER coating with 5-10 wt% EB had long-term corrosion resistance on both uncoupled steel and copper due to the passivation effect of EB on the metal surfaces. During the 150 immersion days, the impedance at 0.1 Hz for the coating increased in the first 1-40 days and subsequently remained constant above 10(9) Omega cm(2), whereas that for pure ER coating fell below 10(6) Omega cm(2) after only 30 or 40 days. Immersion tests on coated steel-copper galvanic couple showed that EB/ER coating offered 100 times more protection than ER coating against steel dissolution and coating delamination on copper, which was mainly attributed to the passive metal oxide films formed by EB blocking both the anodic and cathodic reactions. Salt spray tests showed that 100 mu m EB/ER coating protected steel-copper couple for at least 2000 h. (c) 2007 Elsevier Ltd. All rights reserved.

引用

页码：5392 / 5399

页数：8

共 31 条

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