Studies on the Inhibition of Corrosion of Mild Steel (Part 1)

Abstract

Corrosion rates of mild steel in 5-10% hydrochloric, phosphoric or sulfuric acid at several temperature below boiling point were investigated by adding sulphur or nitrogen containing organic inhibitors at the range of 0.05-0.5% concentration. The results indicate that there exists the minimum corrosion rate with the addition of optimum quantities of inhibitors. This may be explained by the fact that in the presence of optimum quantity of inhibitor there exists minimum corrosion rate due to the degree of compactness of adsorption films and that the degree of compactness depends upon the current intensity of inhibitor molecules according to the electric theory i=ρv.