Effect of Adsorbed Polar Organic Compounds on Activity of Steel in Acid Solution

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Abstract
A series of aliphatic acids, amines, and esters, as well as one commercial corrosion inhibitor, were adsorbed from benzene solution onto SAE 1020 steel powder. These studies (reported elsewhere) showed that some portion of the sorbed material, depending on the compound, could not be desorbed by fresh solvent. The present work was concerned with the effect of the adsorbed material on the activity of the steel powder in aqueous . Dual adsorptions, e.g., an acid followed by an amine on the same steel sample, were also carried out and activities of the metal so treated were determined. The ratio of the activity to that of untreated steel powder, the relative activity, was found to depend on the compound adsorbed and on the type of adsorption. The order of inhibitor effectiveness was about the same as the order of adsorption from benzene, both reversible and irreversible. In general, the acids and amines were considerably more effective as inhibitors than the alcohols and esters. For the acid, amine, and alcohol series, the C10 compounds showed optimum effectiveness. When two inhibitors are used in the same system, greater inhibition is obtained if each adsorbs on different areas.

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