pISSN : 1598-706X / eISSN : 2288-8381
한국주조공학회지 (35권3호 53-61)
Effect of Zn Addition on Corrosion Behavior of Mg-8%Al Casting Alloy
Mg-8%Al 주조 합금의 부식 거동에 미치는 Zn 첨가의 영향
In-Je Hwang, Jung-Hyun Moon, Joong-Hwan Jun† and Young-Jig Kim*
Advanced Process and Materials R&D Group, Korea Institute of Industrial Technology,*School of Advanced Materials Science & Engineering, Sungkyunkwan University
Effects of Zn addition on the microstructure and corrosion behavior of Mg-8%Al-(0- 1)%Zn casting alloys were investigated. With increasing Zn content, the amount of β (Mg17Al12) phase increased, while α-(Mg) dendritic cell size became reduced. The corrosion rate decreased continuously with the increase in the Zn content. The evaluation of the microstructural evolution indicates that the improved barrier effect of β particles formed more continuously along the dendritic cell boundaries and the incorporation of more ZnO into the surface corrosion product, by which the absorption of Cl− ions is impeded, are responsible for the better corrosion resistance in relation to the Zn addition.
Mg-Al-Zn alloy, Microstructure, Corrosion properties, β phase
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