Electrodeposition of nickel-molybdenum alloys from ammonium citrate baths containing intermediate valence molybdenum compounds

Abstract

Electrodeposition of a Ni-Mo alloy under different electrolysis conditions, such as pH and temperature from ammonium citrate baths containing intermediate-valence molybdenum compounds is studied. The effect of differing molybdenum compounds (oxidation degrees of +6, +5, and +3) on the alloy formation makes possible controlling the alloy composition and the current efficiency, by varying the concentration ratio of molybdenum in different states of the oxidation. The prospects for the formation of deposits of adequate quality (compact, with no edge effects) with the current efficiency of nearly 80% are demonstrated.