Galvanostatic pulse and pulse reverse plating of zinc-nickel alloys from sulfate electrolytes on a rotating disc electrode

Galvanostatic pulse and pulse reverse techniques have been used to study the plating of zinc-nickel alloys in the presence of nonyl phenyl polyethylene oxide. The effects of average current density, rotation speed of disc electrode and the presence of nonyl phenyl polyethylene oxide in the electrolyte on deposition of zinc-nickel alloys were evaluated. Zinc-nickel plating bath solution chemistry was studied by determining the equilibrium concentrations at various pH levels. It was found that the alloy composition was determined by solution equilibria, mass transfer of the electroactive species within the diffusion layer and by the surface coverage of nonyl phenyl polyethylene oxide.