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 300°C exhibited further improvement of their mechanical properties.
ChemInform Abstract The effect of pulsing the current on the composition, internal stress, and mechanical properties of Ni-Mo electrodeposits is studied (Cu-substrate, plating bath: nickel sulfate-sodium molybdenate-sodium citrate, pH 10.5). The Mo content increases with peak current density and to a lesser degree with increasing off-time. High-frequency pulse plating at peak current densities of 25 mA/cm2 results in increased yield and tensile strengths. Deposition of alternate layers of different composition results in improved mechanical properties after annealing at 300 rc C.
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