Pulsed electrodeposition of Ni-Mo alloys

The effect of pulsing the current on the composition, the internal stress, and mechanical properties of Ni-Mo electrodeposits was investigated. The molybdenum, content increased with increasing peak current density and to a lesser degree with decreasing duty cycle. A reduction in the internal stresses was explained in terms of the relaxation of those due to crystallite or fine grain coalescence during the off-time and an expansion of the surface layer when hydrogen diffused into it at the start of each on-time. The mechanical properties were improved by high frequency pulse plating. Deposits consisting of alternate layers of different composition annealed at 3000C exhibited further improvement of their mechanical properties