Effect of Reaction Product of Epichlorohydrin and Imidazole on the Electrodeposition Behavior of Zn–Ni Alloy from Alkaline Zincate Solution

A Zn–Ni alloy was electrodeposited on a Cu electrode at current density of 10–5000 A·m−2, charge 5 × 104 C·m−2, and temperature 293 K in an unagitated zincate solution containing the reaction product epichlorohydrin imidazole (EI polymer) as brightener. The effect EI polymer deposition behavior investigated. transition densities which shifted from normal type to anomalous were 50–100 A·m−2 10–20 polymer-free solutions, respectively, indicating that decreased density. corresponded potential total polarization curve significantly more noble region than equilibrium Zn less region. decrease with attributed suppression hydrogen evolution. In addition, efficiency for high-current-density due both Ni depositions. content deposited films polymer, suppressed addition deposition. With increasing density, crystals polymer-containing smoothened showed significant brightness. oxidation suppressed, thus causing corrosion shift direction.