Abstract
The partial current-cathode potential curves for Ni deposition were measured by the potentiostatic method in baths containing various amounts of molybdate. The results indicate that Ni is depolarized by molybdate at lower concentrations of this ion but it is polarized at higher concentrations. The depolarization effect was explained as being due to the adsorption of molybdate catalyzing the Ni deposition according to the mechanism previously proposed for S-compound additives. The polarization effect observed at higher molybdate concentrations is resulted from the formation of intermediate lower oxides of Mo during electrodeposition of alloys. The resistance of the oxide films was measured by the interrupter method.
