Influence of Co2+ and Cu2+ on codeposition of Zn-Ni in acetate-chloride electrolyte have been investigated by the potentiodynamic stripping and XRD methods. In our earlier work it has been determined that the quantity of the eta-phase in the alloy increased with decrease in the quantity of Ni when codeposition of Zn-Ni took place in acetate-chloride electrolyte. Meanwhile, both the quantity of Ni and that of the eta-phase in the alloys decreased, when Co or Cu were incorporated in the alloy. Data of XRD have shown that the quantity of gamma-phase in the alloy increased with increase in the quantities of Co2+ or Cu2+ in acetate-chloride electrolyte. When concentration of [Co2+] (0. 15 mol dm(-3)) was approximately 19 times as high as that of [Cu2+] (0.008 mol dm(-3)), the influence of Co2+ and that of Cu2+ on the phase composition of alloys were nearly similar. (c) 2006 Elsevier Ltd. All rights reserved.