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

摘要

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 x 10~(-2)- 1 x 10~(-5) M. The corrosion of zinc uncoated and covered with protective layer in Na:WO4, 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.