Electrochemical formation of Mg-Li-Y alloys by co-deposition of magnesium, lithium and yttrium ions in molten chlorides  

作　　者：薛云 颜永得 张密林 韩伟 张志俭 

机构地区：[1]Key Discipline Laboratory of Nuclear Safety and Simulation Technology,Harbin Engineering University [2]Key Laboratory of Superlight Materials and Surface Technology,Ministry of Education,College of Materials Science and Chemical Engineering,Harbin Engineering University

出　　处：《Journal of Rare Earths》2012年第10期1048-1054,共7页稀土学报（英文版）

基　　金：Project supported by the National 863 Project of the Ministry of Science and Technology of China (2011AA03A409);National Natural Science Foundation of China (21103033, 21101040 and 91226201);the Fundamental Research Funds for the Central Universities (HEUCF201210002);the Basic Research Foundation of Harbin Engineering University of China (HEUFT08030);the Heilongjiang Postdoctoral Fund (LBH-Z10196 and LBH-Z10207);the China Postdoctoral Science Foundation (20100480974)

摘　　要：An electrochemical approach for the preparation of Mg-Li-Y alloys via co-reduction of Mg, Li, and Y on a molybdenum electrode in LiCl-KCl-MgCl2-YCl3 melts at 943 K was investigated. Cyclic voltammograms （CVs） illuminated that the underpotential deposition （UPD） of yttrium on pre-deposited magnesium led to the formation of a liquid Mg-Y alloy, and the succeeding underpotential deposition of lithium on pre-deposited Mg-Y led to the formation of a liquid Mg-Li-Y alloy. Chronopotentiometry measurements indicated that the order of electrode reactions was as follows： discharge of Mg（II） to Mg-metal, electroreduction of Y on the surface of Mg with formation of ε-Mg24＋xY5 and after that the discharge of Li＋ with the deposition of Mg-Li-Y alloys. X-ray diffraction （XRD） indicated that Mg-Li-Y alloys with different phases were formed via galvanostatic electrolysis. The microstructure of different phases of Mg-Li-Y alloys was characterized by optical microscope （OM） and scanning electron microscopy （SEM）. The analysis results of inductively coupled plasma atomic emission spectrometer （ICP-AES） showed that the chemical compositions of Mg-Li-Y alloys corresponded with the phase structures of the XRD patterns, and the lithium and yttrium contents of Mg-Li-Y alloys depended on the concentrations of MgCl2 and YCl3 .An electrochemical approach for the preparation of Mg-Li-Y alloys via co-reduction of Mg, Li, and Y on a molybdenum electrode in LiCl-KCl-MgCl2-YCl3 melts at 943 K was investigated. Cyclic voltammograms （CVs） illuminated that the underpotential deposition （UPD） of yttrium on pre-deposited magnesium led to the formation of a liquid Mg-Y alloy, and the succeeding underpotential deposition of lithium on pre-deposited Mg-Y led to the formation of a liquid Mg-Li-Y alloy. Chronopotentiometry measurements indicated that the order of electrode reactions was as follows： discharge of Mg（II） to Mg-metal, electroreduction of Y on the surface of Mg with formation of ε-Mg24＋xY5 and after that the discharge of Li＋ with the deposition of Mg-Li-Y alloys. X-ray diffraction （XRD） indicated that Mg-Li-Y alloys with different phases were formed via galvanostatic electrolysis. The microstructure of different phases of Mg-Li-Y alloys was characterized by optical microscope （OM） and scanning electron microscopy （SEM）. The analysis results of inductively coupled plasma atomic emission spectrometer （ICP-AES） showed that the chemical compositions of Mg-Li-Y alloys corresponded with the phase structures of the XRD patterns, and the lithium and yttrium contents of Mg-Li-Y alloys depended on the concentrations of MgCl2 and YCl3 .

关 键 词：Mg-Li-Y alloys electrochemical codeposition molten salt cyclic voltammetry rare earths 

分 类 号：TG146.21[一般工业技术—材料科学与工程]