The effect of systematic increase of Ni on the anodic dissolution and passivation of Zn–Ni alloys in var-ious concentrations of KOH solution (0.1–1 M) was investigated. The anodic dissolution and passivation behaviourfor each pure Zn and Ni in the same studied solutions was also investigated, and the obtained data were compared.Potentiodynamic and potentiostatic methods were used, and the corrosion layer formed on each electrode surfacewas characterized by X-ray diffraction (XRD) and scanning electron microscope (SEM). The results of the nodicpotentiodynamic measurements exhibited that the polarization curves showed active/passive transition in the case ofNi and active/pseudopassive in the case of both Zn and its alloys. The results showed that the increase in Ni contentincreases the activation energy (Ea) and decreases the dissolution rate of the alloys in KOH solution, and the low-est dissolution rate was obtained at 10% Ni. The results of both potentiodynamic and potentiostatic measurementsexhibit sudden increase in current density which is observed at certain positive potential (+0.42 Vvs.SCE) inthe case of the investigated alloys. This indicates that the addition of Ni to Zn promotes the electrochemical reaction(in the passive region). However, the passivation potential shifted to more positive direction with the increase in Ni content in the alloy