Microstructure and Properties of Complez Coating on Magnesium Alloy
A novel complex coating was fabricated to produce pore-free copper coatings on AZ91 magnesium alloy by applying a composite surface treatments which combined the methods of plasma electrolytic oxidation (PEO) pre-treatment, electroless copper plating and benzotriazole (BTA). The cross-section micrographs and chemical composition of coating are examined using scanning electron microscopy (SEM) equipped with energy dispersive analysis of X-rays (EDX). Electrochemical Characterizations using Open circuit potential, potentiodynamic polarization curves and salt spray tests are employed to evaluate corrosion protection of the coating to substrate in 5％ NaCl solution. It is indicated that electroless copper process produces a rough interface between the electroless copper layer and the ceramic layer. The potentiodynamic tests indicated that the corrosion potential shifts to the positive direction significantly and the current density decreases by more than one order of magnitude. There is no noticeable galvanic corrosion pits on the surface of the duplex coating combination PEO and electroless copper after 168 h neutral salt spray testing. The color of copper after BTA immersion could be hold above 60 days.
Plasma electrolytic ozidation Magnesium Electroless copper Corrosion
JIANG Yong-Feng BAO Ye-Feng
College of Mechanical & Electrical Engineering,Hohai University,Changzhou 13022,Jiangsu China College of Mechanical & Electrical Engineering,Hohai University,Changzhou 213022,Jiangsu China
国际会议
The Fourth Asian Conference on Heat Treatment and Surface Engineering(第四届亚洲热处理及表面工程大会)
北京
英文
515-518
2009-10-27（万方平台首次上网日期，不代表论文的发表时间）