ニッケル-モリブデン合金電着における析出合金組成と電解条件について

ニッケル-モリブデン合金電着 (第1報)

抄録

Nickel-Molybdenum alloys were obtained from a plating bath containing molybdic acid, nickel sulfate, potassium sodium tartrate, sodium chloride, and ammonia water (for adjusting pH of the solution). Plating variables studied were metal % of Mo in the bath, total metal ion concentration, potassium sodium tartrate concentration, pH of the bath, cathodic current density, and temperature. The following results were obtained: (1) Mo % in the deposits increased with the increases in metal % of Mo in the bath and total metal ion concentration and the rise of temperature. (2) Potassium sodium tartrate concentration had no effects on the alloy composition. (3) Mo % in the deposits decreased with the increases in pH value of the bath and cathodic current density. (4) Cathodic current efficiencies for the alloy deposition decreased with the increase in Mo % in the deposits, which showed an evident upper limit.