Abstract
The microstructure of AZ31 magnesium alloy was modified by Ca addition. AZ31-Ca alloys with refined microstructure exhibited significantly enhanced corrosion resistance in artificial seawater. AZ31–0.5Ca showed the lowest corrosion rate of 0.716 ± 0.186 mm y−1, which was about 7.4 times lower than that of AZ31 alloy (5.326 ± 0.652 mm y−1). The dominant role in the reduced corrosion rates of AZ31-Ca alloys gradually changed from the compact corrosion products film containing Al2O3 and CaCO3 to the corrosion barriers consisting of net-like (Mg, Al)2Ca phases as the Ca content increased from 0.1 wt% to 1.5 wt%.
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