Study of phase composition of Zn–Ni alloy electrodeposited in acetate–chloride electrolyte at a temperature of 50 °C

Abstract

The phase composition of Zn–Ni alloys electrodeposited under potentiodynamic and galvanostatic conditions in acetate–chloride plating solution with the ratio [Zn +2]/[Ni +2] = 1:12.8 at 50 °C has been investigated by the potentiodynamic stripping and XRD methods. It has been determined that two anodic peaks, which can be attributed to oxidation of the certain phases of Zn–Ni alloy emerged in potentiodynamic stripping curves (PDC) at E < 0 V and at E > 0 V. The Zn–Ni alloy phase that oxidized at E > 0 V was obtained by using cyclic voltammetry with the partial potentiodynamic stripping. This phase is ∼7 at.% Zn solid solution in Ni. The composition of Zn–Ni alloy phase that oxidized at E < 0 is ∼41.0 at.% Zn and ∼59.0 at.% Ni. The ratio of these phases in the alloys depends on the cathodic current density ( i c).