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http://dx.doi.org/10.12656/jksht.2015.28.4.190

Effect of Solution Treatment on Corrosion Behavior of AZ91-2%Ca Magnesium Casting Alloy  

Moon, Jung-Hyun (Advanced Process and Materials R&D Group, Korea Institute of Industrial Technology)
Jun, Joong-Hwan (Advanced Process and Materials R&D Group, Korea Institute of Industrial Technology)
Publication Information
Journal of the Korean Society for Heat Treatment / v.28, no.4, 2015 , pp. 190-199 More about this Journal
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 ${\beta}(Mg_{17}Al_{12})$, $Al_8Mn_5$ and $Al_2Ca$ phases in ${\alpha}-(Mg)$ matrix. After the solution treatment, Al within the ${\alpha}-(Mg)$ 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 $Al_2O_3$, $Al(OH)_3$, CaO and $Ca(OH)_2$ into the surface corrosion product without dissolution of the intermetallic phases along the grain boundaries.
Keywords
AZ91; Ca; solution treatment; corrosion resistance;
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