pISSN : 1598-706X / eISSN : 2288-8381
한국주조공학회지 (28권1호 20-24)
Microstructure and Corrosion Properties of AZ91D Magnesium Alloy treated by Plasma Electrolytic Oxidation
플라즈마 전해 산화 처리한 AZ91D 마그네슘합금 피막의 미세조직 및 부식 특성
Si-Young Chang, Ye-Lim Kim*, Yang-Do Kim**
Korea Aerospace University, *Graduate Student, Korea Aerospace University, **Pusan National University
The characteristics, such as roughness, thickness, microhardness and corrosion resistance, of plasma electrolytic oxide coatings on AZ91D alloy were investigated under the processing condition of various coating times. The coatings on AZ91D alloy consisted of MgO, MgAl2O4 and Mg2SiO4 oxides. The surface roughness and thickness of coatings became larger with increasing the coating time. The microhardness in cross section of coatings was much higher than not only that in surface but that in the conventional anodic oxide coatings, which increased progressively as the coating time increased. After being immersed in 3.5%NaCl solution and methyl alcohol, the corrosion resistance of AZ91D alloy was markedly improved by plasma electrolytic oxidation coating treatment, and the AZ91D alloy coated for 50min revealed excellent corrosion resistance.
Plasma electrolytic oxidation, AZ91D alloy, Roughness, Thickness, Microhardness, Corrosion resistance.
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