Corrosion Properties of the Polypyrrole-molybdate Film Electro-polymerized on the AZ31 Mg Alloy

被引：3

作者：

Wang Guixiang ^{[1
]}

Cao Nana ^{[1
]}

Zhang Xiaohong ^{[1
]}

Zhang Lili ^{[1
]}

机构：

[1] Harbin Engn Univ, Minist Educ, Key Lab Superlight Mat & Surface Technol, Harbin 150001, Peoples R China

来源：

RARE METAL MATERIALS AND ENGINEERING | 2017年 / 46卷 / 06期

基金：

中国国家自然科学基金;

关键词：

polypyrrole-molybdate; cyclic voltammetry; magnesium alloy; corrosion; MAGNESIUM ALLOYS; ELECTROCHEMICAL POLYMERIZATION; PROTECTION; RESISTANCE; PERFORMANCE;

D O I：

暂无

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

The polypyrrole (PPy) coating and polypyrrole-molybdate (PPy-MoO42-) coating were electro-polymerized in sodium salicylate solution by cyclic voltammetry (CV) on the AZ31 Mg alloy surface. Surface morphology of PPy coating and PPy-MoO42- coating on Mg alloy surface before and after being corrupted was observed by scanning electron microscopy (SEM). Attenuated total reflection-infrared (ATR-IR) spectra showed the characteristic ring stretching peaks of the PPy coating and PPy-MoO(4)(2-)coating, and also revealed the influence of MoO42- on the characteristic ring stretching peaks on PPy. The surface resistance was measured by four-point probe method. The open circuit potential (OCP), electrochemical impedance spectroscopy (EIS) and potentiodynamic polarization analyzed the corrosion resistance performance of PPy coating and PPy-MoO42- coating on the Mg alloy surface in 3.5% NaCI solution immersing for 12 h. The results show that the surface morphology of PPy-MoO42- coating is compact. And the corrosion current density of PPy-MoO42- coating is lower three orders than that of the PPy coating. The PPy-MoO42- coating on the Mg alloy surface has better corrosion resistance and smaller surface resistance than the PPy coating because of the existence of the molybdate ion.

引用

页码：1480 / 1485

页数：6