Comparative Evaluation of Surface Treatment Effect of AZ91D Alloy Material

Abstract

Magnesium is chemically reactive, weakly corrosive, weakly abrasion resistant and heat resistant, so various surface treatments
have been developed. Non-chromate, anodizing, and plasma anodizing were selected as the surface treatment methods, and a
comparative study on surface components, oxide thickness, heat diffusivity, dielectric breakdown voltage, hardness, and corrosion resistance was conducted. More specifically, the thermal conductivity is best in the case of non-chromate, and the breakdown voltage and Vickers hardness are highest in the case of plasma anodization. In the salt spray test, the corrosion resistance rating number was 3.5, 7, and 9 for non-chromate, anodization and plasma anodization, respectively