Production of Mo–Ni Coatings by Melt Electrolysis NaCl–KCl–MoCl3–NiCl2

Electrochemical co-deposition of Mo and Ni from NaCl–KCl–MoCl3–NiCl2 melt at 720°C is studied. The results of studying Ni and Ni–Mo cathodic deposits obtained by electrolysis in the cathodic current density range of 0.01–0.05 A/cm2 are presented. The conditions of electrolysis of NaCl–KCl–MoCl3–NiCl2 melt providing production of nickel-molybdenum coatings on MPG-8, AISI 316 L, CrNi80MoTiAl substrates in an argon atmosphere are revealed. It is found that compact deposits of Mo–Ni alloys can be obtained at a cathodic current density of up to 0.03 A/cm2. It is shown that at cathodic current densities above 0.03 A/cm2, dendritic deposits are deposited. Dendritic formation was observed at the three-phase boundary MPG-8/electrolyte/argon. The chemical composition of Mo–Ni precipitates corresponds to the compounds Ni4Mo, Ni3Mo, which is consistent with the Ni–Mo phase diagram.