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The electrochemical properties of Dy(Ⅲ), Ni(Ⅱ) and Dy(Ⅲ)+ Ni(Ⅱ) in dimethylformamide were studied by cyclic voltammetry on Pt or Cu electrode. Black, metallic lustered, compact and well adhesive Dy-Ni alloy films can be co-deposited on Cu electrode by swe