A Co-Zn alloy deposit was obtained from ambient temperature molten salt electrolyte CoCl₂-ZnCl₂-EMIC. The Co content in the Co-Zn alloy deposit was continuously controlled from 0 to 100wt% by controlling the bath composition and current density. Co-Zn alloy deposit morphology was significantly improved by EMIC. Moreover, the bath temperature could be decreased from 130 to 80°C. The Co-Zn alloy deposit crystal structure changes from the Zn binary phase and intermetallic compound Co₅Zn₂₁ to the Co binary phase and the intermetallic corresponding compound as a function of Co content in the deposit. An amorphous deposit of Co-Zn alloy is obtained from this molten electrolyte.