IFKhAN-54, a new inhibitor of acid corrosion of steels

Corrosion and electrochemical behavior of low- and high-carbon steels (stee l 20 and Y7A) in aqueous solutions of sulfuric acid and that of Armco iron in aqueous solutions of hydrochloric acid at 80 and 20 degreesC were studie d in the presence of a new effective inhibitor, IFKhAN-54, which is a techn ical product of condensation of aldehydes with nitrogen-containing oligomer s. IFKhAN-54 was found to retard anodic iron dissolution, functioning mainl y as a blocking inhibitor in hydrochloric acid (for the acid composition st udied). In sulfuric acid, its effectiveness is enhanced in the presence of chloride ions. New inhibitive formulations based on IFKhAN-54 suppress acid corrosion of steels very effectively, including corrosion in chloride-free sulfuric acid.