1973 Volume 22 Issue 12 Pages 500-503
Corrosion rates of mild steel in chromate solutions containing sulfate or chloride ions were estimated at a pH of 8 by the polarization resistance method. The critical concentration of chromate above which corrosion rate is below 1mdd increased with increase of sulfate or chloride concentration. Presence of Ca2+ ions did not affect the value of the critical concentration. It was demonstrated for waters from different sources that a rough estimation of the critical concentration of chromate could be made preliminarily as far as the concentrations of sulfate and chloride are known.