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用循环伏安法、恒电位电解断电后的电极电位－时间曲线、电位阶跃法和Ｘ射线衍射法研究了Ｃｕ电极在ＮａＣｌ－ＫＣｌ－ＤｙＣｌ３熔体中的电化学行为，获知Ｄｙ在Ｃｕ电极上的还原过程是首先生成Ｄｙ－Ｃｕ合金，然后才析出纯金属Ｄｙ．测得Ｄｙ－Ｃｕ合金在１０７３Ｋ的标准生成自由能；在１０２３－１１４３Ｋ范围内，Ｄｙ原子在Ｄｙ－Ｃｕ合金相中的扩散系数与温度的关系式为ｌｎＤ＝－６７．１×１０３／ＲＴ－１５．８，其扩散活化能为６７．１ｋＪ·ｍｏｌ－１．用自耗阴极法制取了Ｄｙ－Ｃｕ中间合金并对其工艺条件进行了探讨。电解制取了含Ｄｙ高达９２％（质量分数）的Ｄｙ－Ｃｕ中间合金，其组成为ＤｙＣｕ和Ｄｙ，电流效率可达８０％．
The electrochemical behavior of Cu electrode in NaCl-KCl-DyCl3 melt was investigated by cyclic voltammetry, electrode potential-time curve, potential step method and X-ray diffraction after potentiostatic electrolysis. The reduction process on the electrode is the first generation of Dy-Cu alloy, and then only the pure metal Dy precipitated. The standard free energy of Dy-Cu alloy at 1073K was measured. The relationship between the diffusion coefficient of Dy atom and temperature in the range of 1023-1143K was lnD = -67.1 × 103 / RT- 15.8, the diffusion activation energy of 67.1kJ · mol-1. Dy-Cu master alloy was prepared by self-consumption cathodic method and the process conditions were discussed. Electrolytic Dy-Cu master alloy containing Dy up to 92% (mass fraction) was prepared. Its composition was DyCu and Dy, and the current efficiency was up to 80%.