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http://dx.doi.org/10.5695/JKISE.2013.46.2.080

Effect of CaO Addition on the High-temperature Oxidation of AZ31 Magnesium Alloys  

Won, Sung Bin (School of Advanced Materials Science and Engineering, Sungkyunkwan University)
Lee, Dong Bok (School of Advanced Materials Science and Engineering, Sungkyunkwan University)
Publication Information
Journal of the Korean institute of surface engineering / v.46, no.2, 2013 , pp. 80-86 More about this Journal
Abstract
Magnesium alloys of AZ31 containing (0.5, 1, 1.5) wt.% of initially added CaO particles were cast in air, and their oxidation behavior was studied at $450-650^{\circ}C$ in air. The initially added CaO particles either decomposed to dissolve in the ${\alpha}$-Mg matrix or precipitated as $Al_2Ca$ along the grain boundaries of the matrix during casting. The ignition temperatures were $565.4^{\circ}C$ for AZ31, $608.6^{\circ}C$ for AZ31+0.5 wt.%CaO, and $689.7^{\circ}C$ for AZ31+1 wt.%CaO. No ignition occurred for AZ31+1.5 wt.%CaO up to $700^{\circ}C$, displaying good oxidation resistance. The CaO-rich oxide scales that formed on the surface of the AZ31+(0.5, 1, 1.5) wt.%CaO alloys improved the oxidation resistance of AZ31 alloys.
Keywords
Magnesium alloys; AZ31; CaO; Oxidation;
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