Preparation of ternary Mg-Li-Sn alloys from molten salt by electrolysis

Peng CAO,Milin ZHANG,Wei HAN,Yongde YAN and Lijun CHEN Key Laboratory of Superlight Materials and Surface Technology,Ministry of Education,College of Materials Science and Chemical Engineering,Harbin Engineering University,Harbin 150001,China

摘 要：Electrochemical behavior of Mg,Li and Sn on tungsten electrodes in LiCl-KCl-MgCl2SnCl2 melts at 873 K was investigated.Cyclic voltammograms（CVs） showed that the underpotential deposition（UPD） of magnesium on pre-deposited tin leads to the formation of a Mg-Sn alloy,and the succeeding underpotential deposition of lithium on pre-deposited Mg-Sn alloy leads to the formation of a Mg-Li-Sn alloy.Chronopotentiometric measurements indicated that the codepositon of Mg,Li and Sn occurs at current densities more negative than-1.16 A.cm 2.X-ray diffraction（XRD） indicated that Mg2Sn phase is formed via galvanostatic electrolysis.The element Mg distributes homogeneously and Sn locates mainly on the grain boundaries in the MgLi-Sn alloy.

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