中国有色金属学报(英文版)
Transactions of Nonferrous Metals Society of China
| Vol. 36 No. 1 January 2026 |
（a School of Materials Science and Engineering, Zhejiang University, Hangzhou 310058, China;
b Department of Materials Science and Engineering, Westlake University, Hangzhou 310030, China）
Abstract:The molten CaCl2-CaMoO4 system was investigated, and the electrodeposition of protective Mo coatings on Ni plates was demonstrated. The results confirm the high solubility of solid CaMoO4 and the electrochemical reactivity of MoO42– ions in molten CaCl2. The eutectic temperature and composition of the system are identified as 1021 K and 4.74 wt.% CaMoO4, respectively. Under constant-current electrolysis conditions of -10 mA/cm2 at 1123 K, uniform and dense Mo coatings are obtained on Ni plates with up to 90.31% efficiency. Increasing the current density raises the overpotential, leading to refined grains and decreased roughness. The Mo-coated Ni plate exhibits a significant improvement in hardness and corrosion resistance. Microhardness increases from HV 46.00 to HV 215.10 after coating, and the corrosion rate in a 20 wt.% NaCl solution at room temperature decreases to 0.1% that of the bare plate. These findings enhance our understanding of the molten CaCl2–CaMoO4 system and emphasize the potential of innovative Mo coating technologies.
Key words: molybdenum; nickel; calcium molybdate; calcium chloride; electrodeposition; hardness; corrosion
