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 2(2) full 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/cm(2) current density, 20 rpm cathode rotation, 9.0 pH at 30 degrees 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 x 10(3) Ohm cm(2) and I (corr) 6.468 x 10(-7) A/cm(2). 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.