ON THE ADSORPTION OF HEXAMETHYLENEIMINE NITROBENZOATE, A CORROSION-INHIBITOR, BY IRON

Adsorption of a volatile corrosion inhibitor, hexamethyleneimine nitro benzoate, 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 surfa ce the inhibitor forms a film, which consists (I) of a nitrogen-contai ning adsorption layer including molecules of the inhibitor and its dis sociation, 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 (similar to 17 h). The che mical composition of I was proposed, and a decrease in the amount of i nhibitor reduction products under water-deficient conditions was demon strated.