Effect of Conversion Coatings and Oxalate Ion on Corrosion of Pure Zinc in 1 M NaCl Solution

Abstract

The corrosion of zinc coated with tungstate, molybdate and phosphate were investigated in the 1 M NaCl solution containing different sodium oxalate with concentrations of 1 × 10^-2 - 1 × 10^-5 M. The corrosion of zinc uncoated and covered with protective layer in Na₂WO₄, Na₂MoO₄ and Na₂HPO₄ were investigated in 1 M NaCl + xM Na₂C₂O₄ solutions by using potentiodynamic and impedance methods. The corrosion rates of zinc are especially low in the NaCl solution containing low oxalate concentrations.