Protection of steel in solutions of mineral acids using α,β-unsaturated aldehydes, ketones, and azomethines

Abstract

The current state of research in the field of inhibitory protection of metals from corrosion in solutions of mineral acids using α,β-unsaturated carbonyl compounds and azomethines has been considered. Literary data on protection of various steels in solutions of acids using these substances have been summarized, and features of the mechanism of their protective action have been discussed. The possibility of steel protection in hydrochloric acid by the considered compounds and compositions based on them in the conditions of high-temperature corrosion has been noted. It has been shown that the mechanism of the inhibitory action of α,β-unsaturated aldehydes, ketones, and azomethines is based on their ability to form a protective film of polymer on the metal surface. The low inhibitory efficiency of the considered compounds on steels in sulfateacid media is a consequence of their participation in electrode reactions of metal as depolarizator and complexing agent.