Oxidation Behavior of Molten Magnesium Containing Calcium

摘要

Oxidation behavior and morphological changes of oxide films in molten magnesium alloy containing various amount of Ca were investigated. With increasing Ca content, the ignition of molten alloys maintained to 700 deg C in the air was delayed dramatically. The oxide films formed at 700 deg C in Ca containing magnesium were compact, thin and dense. The oxide films in Ca-containing magnesium alloys also consisted of the mixture of MgO and CaO. Therefore, the continuous oxidation of Ca-containing magnesium alloys was suppressed by the formation of dense oxide films on the surface of molten magnesium alloys.