Corrosion of AZ91D magnesium alloy with a chemical conversion coating and electroless nickel layer

被引：275

作者：

Huo, HW ^{[1
]}

Li, Y ^{[1
]}

Wang, FH ^{[1
]}

机构：

[1] Chinese Acad Sci, Met Res Inst, State Key Lab Corros & Protect, Shenyang 110016, Peoples R China

来源：

CORROSION SCIENCE | 2004年 / 46卷 / 06期

基金：

中国国家自然科学基金;

关键词：

AZ91D; magnesium alloy; chemical conversion; electroless nickel plating;

D O I：

10.1016/j.corsci.2003.09.023

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

A chemical conversion treatment and an electroless nickel plating were applied to AZ91D alloy to improve its corrosion resistance. By conversion treatment in alkaline stannate solution, the corrosion resistance of the alloy was improved to some extent as verified by immersion test and potentiodynamic polarization test in 3.5 wt.% NaCl solution at pH 7.0. X-ray diffraction patterns of the stannate treated AZ91D alloy showed the presence of MgSnO3 (.) H2O, and SEM images indicated a porous structure, which provided advantage for the adsorption during sensitisation treatment prior to electroless nickel plating. A nickel coating with high phosphorus content was successfully deposited on the chemical conversion coating pre-applied to AZ91D alloy. The presence of the conversion coating between the nickel coating and the substrate reduced the potential difference between them and enhanced the corrosion resistance of the alloy. An obvious passivation occurred for the nickel coating during anodic polarization in 3.5 wt.% NaCl solution. (C) 2003 Elsevier Ltd. All rights reserved.

引用

页码：1467 / 1477

页数：11

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