Corrosion and polarization characteristics of zinc in neutral—acid media — II. Effect of NH+4 ions and the role of battery zinc alloying constituents

The corrosion and polarization characteristics of zinc have been studied in molar, quiescent solutions of NH4ClO4, (NH4)2SO4, NH4Cl and NH4Br in the pH range 3.8–5.8. Corrosion rates have been determined by the Tafel line extrapolation procedure and the polarization resistance method where possible. Numerical values of the corrosion currents are compared. The role of NH+4 ions, anions, pH and battery zinc alloying constituents on the nature of the rate controlling anodic and cathodic processes are discussed.