Journal of the Korean institute of surface engineering (한국표면공학회지)

The Korean Institute of Surface Engineering (한국표면공학회)
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Effect of CaO Addition on the High-temperature Oxidation of AZ31 Magnesium Alloys

AZ31 마그네슘 합금의 고온산화에 미치는 CaO 첨가 영향

  • Won, Sung Bin (School of Advanced Materials Science and Engineering, Sungkyunkwan University) ;
  • Lee, Dong Bok (School of Advanced Materials Science and Engineering, Sungkyunkwan University)
  • 원성빈 (성균관대학교 신소재공학과) ;
  • 이동복 (성균관대학교 신소재공학과)
  • Received : 2013.03.06
  • Accepted : 2013.04.26
  • Published : 2013.04.30
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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.

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