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

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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.

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Correspondence to Ya. G. Avdeev.

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Translated by Sh. Galyaltdinov

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Andreeva, N.P., Kuznetsov, D.S. & Avdeev, Y.G. Study of the Adsorption of the IFKhAN-92 Inhibitor on the Surface of Chromium–Nickel Steel from Hydrochloric and Sulfuric Acid Solutions by Ellipsometry. Prot Met Phys Chem Surf 55, 1280–1286 (2019) doi:10.1134/S2070205119070025

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Keywords:

  • acid corrosion
  • corrosion inhibitors
  • chromium–nickel steel
  • triazoles
  • adsorption
  • ellipsometry