Effect of Trace In on Microstructure,Electrochemical Behavior and Discharge Performance of Mg-4Sn Alloy
1.0wt%In was introduced to Mg-4Sn cast alloy,and the effects of trace In on its microstructure,electrochemical property and discharge performance were studied.The result shows that the microstructure of the alloy before and after adding In element consists of dendritic α-Mg matrix and a small amount of Mg2Sn phase scattered along grain boundary.After the addition of In,it dissolves into the matrix,and the dendritic crystal size decreases,the uniformity of Mg2Sn phase improves,the open circuit potential of the alloy is more negative,the self-corrosion current density is lower.In the battery performance testing,the alloy with addition of In shows a smoother discharge process,more negative discharge potential and bigger anode efficiency.This is mainly attributed to the higher discharge activity and looser discharge products of the alloy after the addition of In.
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