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http://dx.doi.org/10.12656/jksht.2020.33.3.129

The Effect of Calcium Oxide on Oxidation Resistance of Magnesium alloy  

Kim, Kibeom (Marine Convergence Design Co-work, Pukyong National University)
Kim, Sangpil (Marine Convergence Design Co-work, Pukyong National University)
Kim, Kwonhoo (Dept. of Metallurgical Engineering, Pukyong National University)
Publication Information
Journal of the Korean Society for Heat Treatment / v.33, no.3, 2020 , pp. 129-134 More about this Journal
Abstract
Due to excellent properties such as high specific strength and low density, application of magnesium alloys have been rapidly increased. However, magnesium alloy has a serious problem that is easily oxidized when exposed to high-temperature. For this reason, magnesium alloys have been generally used for SF6 gas such as protective cover gas in casting and melting, but it has been reported that this gas has a serious influence on global warming. Therefore, many researchers have been studied to improve the oxidation resistance of magnesium alloy. It was reported that addition of Be, Ca and CaO in magnesium alloy can improve the oxidation properties. In this study, the possibility of improving the oxidation resistance by adding CaO extracted from oyster shells was investigated. Oyster shells were completely decomposed into CaO and CO2 by annealing. With the addition of CaO, a coexistence region of MgO + CaO was formed in the oxide layer and its thickness was also reduced.
Keywords
Magnesium; Calcium oxide; Oxidation resistance; Annealing;
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