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Mechanism of protective action of amine nitrobenzoates
Abstract
Using meta-nitrobensoates of hexamethyleneamine, morpholine and ammonia, the authors studied the effect of cation (amine component) on the interaction of these inhibitors with St3 steel. Electrochemical, ellipsometric and mass-spectrometric methods were used in this study. It is found that the amine nitrobenzoates studied do not differ fundamentally in their action on anodic and cathodic reactions. Inhibition is closely related to the nature and strength of adsorption of amine nitrobenzoates on the steel.
Adsorption of a volatile corrosion inhibitor, hexamethyleneimine nitrobenzoate, from thin films of its solution in water and toluene by iron was studied by XPES. It was found that on the air-oxidized iron surface the inhibitor forms a film, which consists (I) of a nitrogen-containing adsorption layer including molecules of the inhibitor and its dissociation, reduction, and hydrolysis products, and (II) of higher iron oxides. It was demonstrated that formation of I is completed after 4 h, while formation of II requires more time (∼ 17 h). The chemical composition of I was proposed, and a decrease in the amount of inhibitor reduction products under water-deficient conditions was demonstrated.
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