Study of the Adsorption of the IFKhAN-92 Inhibitor on the Surface of Chromium–Nickel Steel from Hydrochloric and Sulfuric Acid Solutions by Ellipsometry

Abstract

The method of reflective ellipsometry has been used to study the adsorption of the IFKhAN-92 inhibitor that is a triazole derivative on 12Kh18N10T nickel–chromium steel from dilute solutions of HCl and H₂SO₄ (t = 20 ± 2°C). It is shown that the adsorption process of this inhibitor is satisfactorily described by Temkin isotherm; its parameters are calculated. The values of free energy of adsorption of the inhibitor determined on the basis of this isotherm are ≈55 kJ/mol, which allows one to conclude about the chemisorption nature of the interaction of triazole molecules and the metal surface. An increase in the adsorption of the IFKhAN-92 inhibitor on chromium–nickel steel in H₂SO₄ solution with the addition of rhodanide-anions has been noted.