Electrochemical formation of Mg-La-Mn alloys by coreduction of Mg(Ⅱ),La(Ⅲ)and Mn(Ⅱ)in LiCl+KCl molten salts  

作　　者：Mei Li Yongcheng Zhang Haiming Li Hailing Jiang Wei Han Yang Sun 

机构地区：[1]Key Laboratory of Superlight Materials and Surface Technology,Ministry of Education,College of Material Science and Chemical Engineering,Harbin Engineering University,Harbin 150001,China

出　　处：《Journal of Rare Earths》2022年第3期501-507,I0006,共8页稀土学报（英文版）

基　　金：Project supported by the National Natural Science Foundation of China(21790373,21876034,11875116,11675044,11575047)。

摘　　要：In the present work,cyclic voltammetry(CV),square wave voltammetry(SWV)and chronopotentiometry(CP)were used to investigate the electrochemical coreduction behaviors of La(Ⅲ)and Mg(Ⅱ)as well as La(Ⅲ),Mg(Ⅱ)and Mn(Ⅱ)on Mo electrode in LiCl+KCl molten salts.CV and SWV results exhibit that the coreduction mechanism of La(Ⅲ)and Mg(Ⅱ)on Mo electrode is that La(Ⅲ)is reduced and Mg-La intermetallic compound is formed,leading to the deposition potential of La(Ⅲ)shifting to more positive one.The electrochemical signals pertaining to the formation of metallic La,Mg and Mn as well as Mg-La intermetallic compound are also observed by coreduction of La(Ⅲ),Mg(Ⅱ),and Mn(Ⅱ)in LiCl+KCl molten salt on the inert Mo electrode.However,the electrochemical signals associated with the formation of La-Mn and Mg-Mn alloys are not observed,which means that the depolarization effect of La(Ⅲ)and Mg(Ⅱ)does not occur on pre-deposited Mn electrode.The Mg-La-Mn alloys were formed by co-deposition of La(Ⅲ),Mg(Ⅱ),and Mn(Ⅱ)on Mo electrode at various concentration ratios of La(Ⅲ)and Mg(Ⅱ).The results of scanning electron microscopy equipped with energy dispersive spectroscopy and X-ray diffraction displays that the Mg-La-Mn alloys are comprised of La-Mg compound Mg_(17)La_(2),Mg and Mn phases.The concentration ratio of La(Ⅲ)and Mn(Ⅱ)has few effects on the alloy composition.

关 键 词：Electrochemical formation Coreduction Mg-La-Mn alloy ELECTROLYSIS Rare earths 

分 类 号：TG146.22[一般工业技术—材料科学与工程]