Abstract: Cyclic voltammetry and potentiostatic electrolysis were used to investigate the preparation of Er-Bi alloy films in LiCl-DMSO system.The effects of several factors including the potential and current density of deposition and concentrations of main salts were studied.Experimental results indicate that Er-Bi alloy films containing Er 24.09％～46.56％ could be prepared in ErCl3-Bi(NO3)3-LiCl-DMSO system by controlling the composition and deposition conditions of the system.They are gray, uniform, of metallic luster and adhere firmly to the copper substrates showed by SEM, EDS, XRD and DSC. After heating at 723 K for 1 h, the crystallized alloy phase of Er-Bi could be found in XRD patterns.

Key words: Bismuth, Er-Bi alloy films, Electrodeposition, DMSO(dimethylsulfoxide)