Preparation of Mg-Li-Sm alloys by electrocodeposition in molten salt
来源期刊：JOURNAL OF RARE EARTHS2009年第6期
论文作者：YAN Yongde ZHANG Milin TIAN Yang JING Xiaoyan HAN Wei
Key words：Mg-Li-RE alloys; electrodeposition; current efficiency; molten salt; rare earths;
Abstract: Electrocodeposition of Mg-Li-Sm alloys was investigated in molten KCl-LiCl-MgCl_2-SmCl_3-KF system. The effects of electrolytic temperature and cathodic current density on current efficiency were studied and optimal electrolysis parameters were obtained. The optimum electrolysis condition was a molten salt mixture of LiCl: KCl=50:50 (wt.%), electrolytic temperature: 660 ℃, cathode current density:9.5 A/cm~2 and electrolysis time of 40 min. The current efficiency reached 77.3%. X-ray diffraction (XRD) and scanning electron microscopy (SEM) analyses of the deposits indicated that Mg-Li-Sm alloys, having Mg, βLi and Mg_(41)Sm_5 phases, were obtained by electrocodeposition in molten system. The content and distribution of elements in Mg-Li-Sm alloys were analyzed by ICP-MS and EPMA, respectively.The re-sults showed that the distribution of Mg and Sm was homogeneous in the alloys. ICP analyses of samples obtained by electrolysis showed that lithium contents in Mg-Li-Sm alloys could be controlled by MgCl_2 concentration and electrochemical parameters. It was proved that preparation of Mg-Li-Sm alloys by electrocodeposition in molten salt was feasible.
YAN Yongde1，ZHANG Milin1，TIAN Yang1，JING Xiaoyan1，HAN Wei1
(1.Key Laboratory of Superlight Materials and Surface Technology,Ministry of Education,College of Materials Science and Chemical Engineering,Harbin Engineering University,Harbin 150001,China)
Abstract:Electrocodeposition of Mg-Li-Sm alloys was investigated in molten KCl-LiCl-MgCl_2-SmCl_3-KF system. The effects of electrolytic temperature and cathodic current density on current efficiency were studied and optimal electrolysis parameters were obtained. The optimum electrolysis condition was a molten salt mixture of LiCl: KCl=50:50 (wt.%), electrolytic temperature: 660 ℃, cathode current density:9.5 A/cm~2 and electrolysis time of 40 min. The current efficiency reached 77.3%. X-ray diffraction (XRD) and scanning electron microscopy (SEM) analyses of the deposits indicated that Mg-Li-Sm alloys, having Mg, βLi and Mg_(41)Sm_5 phases, were obtained by electrocodeposition in molten system. The content and distribution of elements in Mg-Li-Sm alloys were analyzed by ICP-MS and EPMA, respectively.The re-sults showed that the distribution of Mg and Sm was homogeneous in the alloys. ICP analyses of samples obtained by electrolysis showed that lithium contents in Mg-Li-Sm alloys could be controlled by MgCl_2 concentration and electrochemical parameters. It was proved that preparation of Mg-Li-Sm alloys by electrocodeposition in molten salt was feasible.
Key words:Mg-Li-RE alloys; electrodeposition; current efficiency; molten salt; rare earths;
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