Formation mechanism of pulse current anodized film on AZ91D Mg alloy

来源期刊：中国有色金属学报(英文版)2008年第1期

论文作者：钱建刚 王纯 李荻 郭宝兰 宋光铃

文章页码：19 - 23

Key words：Mg alloy; pulse anodizing; film-forming process

Abstract: The kinetics of forming process of pulse current anodized film on AZ91D Mg alloy was studied by the voltage—time and thickness—time curves. The surface morphology, structure, elemental constitution and valences of the anodic films were analyzed by SEM, EDS, XPS and XRD respectively. The results show that the film-forming process can be divided into four stages. Formation of a dense layer before sparking is the first stage. Formation of a porous layer accompanied with slight sparking is the second stage. The third stage is characterized by fast growth of the porous layer accompanied with more intensive sparking. The fourth stage starts after the sparking process becomes even more vigorous and the pores become large.

基金信息：the Aeronautical Science Research Foundation of China
the Natural Science Foundation of Beijing, China