Abstract
Corrosion and electrochemical behavior of low- and high-carbon steels (steel 20 and У7А) in aqueous solutions of sulfuric acid and that of Armco iron in aqueous solutions of hydrochloric acid at 80 and 20°C were studied in the presence of a new effective inhibitor, IFKhAN-54, which is a technical product of condensation of aldehydes with nitrogen-containing oligomers. IFKhAN-54 was found to retard anodic iron dissolution, functioning mainly as a blocking inhibitor in hydrochloric acid (for the acid composition studied). 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.
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