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Castability and electrochemical properties of the as-cast Mg-alloys, i.e., Mg-Xwt%(X=0.22∼1.31)Ca alloy, Mg-Xwt%(X=0.24∼0.26)Mn-Y wt% (Y=0.10∼0.14)Ca alloys were evaluated. Out of these alloys, the Mg-0.26wt%Mn-0.14wt%Ca alloy shows the highest efficiency and lowest open-circuit potential. Flow length of the specimens decrease with an increase of Ca content. Serious decrease of flow ability in Mg melt is observed in Mg-1.31wt%Ca alloy. However, flow length of Mg-Ca alloys is negligibly influenced by small amounts of Mn addition. The improved performance of Mg-Ca alloys, regardless of Mn addition is attributed to the homogeneous and refined microstructures, extremely electronegative potential of Ca. It is considered from that serious reduction in flow reduction of Mg-1.31wt%Ca alloy is due to cast from large solidification interval.

The Effect of Micro-Alloying Addition of Ca and Ma on Castability and Performance of Mg-Based Sacrificial Anodes