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%.

AZ31镁合金的显微组织通过添加Ca进行了改性。具有精细微观结构的 AZ31-Ca 合金在人工海水中表现出显着增强的耐腐蚀性。AZ31-0.5Ca 的腐蚀速率最低，为 0.716 ± 0.186 mm y ^-1，比 AZ31 合金（5.326 ± 0.652 mm y ^-1）低约 7.4 倍。AZ31-Ca合金腐蚀速率降低的主导作用逐渐从含有Al ₂ O ₃和CaCO ₃的致密腐蚀产物膜转变为由网状(Mg、Al) ₂ Ca相组成的腐蚀屏障作为Ca含量从 0.1 wt% 增加到 1.5 wt%。