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MICROSTRUCTURE AND PROTECTIVE PERFORMANCE OF ANODIC FILMS ON MAGNESIUM ALLOY AZ91D

ZHANG Yong-jun, YANG Chuan-wei, WANG Fu-hui State Key Laboratory for Corrosion and Protection , Institute of Metal esearch, Chinese Academy of Sciences, Shenyang 110016, China Institute of Corrosion Protection and Surface Engineering College of Industrial Equipment and Control Engineering, South China University of Technology, Guangzhou 510640, China  
The microstructures of anodic films formed by different anodizing processes on magnesium alloy AZ91D and their protective performance were investigated by SEM(Scanning ELectron Microscopy) and salt spray test etc.The relevant protective performances included corrosion protection, abrasion resistance and the adhesion between anodic film and substrate. It was found that the mi-crostructure of different anodic films and their protective performance were different according to the processes remarkably. It was testified that the anodic film formed by the so called environmentally friendly new process could provide much effective protectiveness to the substrate.
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