Effect of heat diffusion on properties of zinc-aluminum coating on AZ91D magnesium alloys

• Published in: Transactions of Nonferrous Metals Society of China Vol. 16; no. A03; pp. 1831 - 1834
• Main Author: 李兆峰 黄伟九 刘明
• Format: Journal Article
• Language: English
• Published: School of Material Science and Engineering, Chongqing Institute of Technology, Chongqing 400050, China 01.12.2006
• Subjects: 热扩散; 金属腐蚀; wear; magnesium alloy; corrosion; heat diffusion; zinc-aluminum coating
• ISSN: 1003-6326

A protecting zinc and aluminum coating on the surface of AZ91D magnesium alloys was obtained by thermal spraying to improve the corrosion and wear resistance performances. In order to enhance the combination between magnesium alloy matrix and zinc and aluminum coating, the sample was heat-treated at 300 ℃ for 2 h, then, the cross-section patterns, XRD pattern, micro-hardness, wear and corrosion resistance abilities were researched. The results indicate that the interface between the coating and substrate is metallurgical bond, and a transitional fusion layer is formed by diffusion. The micro-scale abrasion test and polarization test in 3% NaCl solution show that the diffusion-treated specimen has better wear and corrosion resistance performances in comparison with the undiffusion-treated and substrate magnesium alloys; in addition, it has relatively higher micro-hardness than the undiffusion-treated magnesium alloys.