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http://dx.doi.org/10.7777/jkfs.2015.35.3.053

Effect of Zn Addition on Corrosion Behavior of Mg-8%Al Casting Alloy  

Hwang, In-Je (Advanced Process and Materials R&D Group, Korea Institute of Industrial Technology)
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)
Kim, Young-Jig (School of Advanced Materials Science & Engineering, Sungkyunkwan University)
Publication Information
Journal of Korea Foundry Society / v.35, no.3, 2015 , pp. 53-61 More about this Journal
Abstract
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 ${\beta}(Mg_{17}Al_{12})$ phase increased, while ${\alpha}$-(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 ${\beta}$ 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.
Keywords
Mg-Al-Zn alloy; Microstructure; Corrosion properties; ${\beta}$ phase;
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Times Cited By KSCI : 1  (Citation Analysis)
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