Studies on electrodeposition of corrosion resistant Ni–Fe–Mo alloy

A study to optimize the process parameters for electrodeposition of a Ni–Fe–Mo alloy is reported. A 2²full factorial design was successfully employed for the experimental design analysis of the results. The optimum experimental conditions for producing the corrosion resistant alloy were 120 mA/cm² current density, 20 rpm cathode rotation, 9.0 pH at 30 °C. The alloy was deposited at 61% current efficiency, with an average composition of 62 wt% Ni, 17wt% Fe, 21wt% Mo and traces of boron, and with E _corr −0.506 V, R _p 8.883 × 10³ Ohm cm² and I _corr 6.468 × 10⁻⁷ A/cm². The deposit obtained under these conditions had an amorphous character, good adherence, high corrosion resistance and a nodular morphology. Electrochemical corrosion tests verified that the electrodeposited Ni–Fe–Mo alloy had better corrosion resistance than the Fe–Mo alloy.