주조용 AZ91-2%Ca 마그네슘 합금의 부식 거동에 미치는용체화처리의 영향 = Research Effect of Solution Treatment on Corrosion Behavior of AZ91-2%Ca Magnesium Casting Alloy

다국어 초록 (Multilingual Abstract)

The study is intended to investigate the effect of solution treatment on microstructure and corrosion behavior of AZ91(Mg-9%Al-1%Zn-0.3%Mn)-2%Ca casting alloy. In as-cast state, the AZ91-2%Ca alloy consisted of intermetallic β(Mg17Al12), Al8Mn5 and Al2Ca phases in α-(Mg) matrix. After the solution treatment, Al within the α-(Mg) matrix was distributed more homogeneously, along with the slight decrease in the total amount of intermetallic compounds. The corrosion resistance of the AZ91-2%Ca alloy was improved after the solution treatment. The microstructural examinations for the solution-treated samples revealed that the better corrosion resistance may well be related to the incorporation of more oxides and hydroxides such as Al2O3, Al(OH)3, CaO and Ca(OH)2 into the surface corrosion product without dissolution of the intermetallic phases along the grain boundaries.

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