Mechanism of iron corrosion inhibition with morpholine based quaternary ammonium salts in methanesulfonic acid

Keywords

morpholine, inhibitor, corrosion, iron, adsorption, inhibiting effect, “blocking” model.

Cite as

Amirulloieva N. V., Sknar Yu. Ye., and Amirulloiev R. S. Mechanism of iron corrosion inhibition with morpholine based quaternary ammonium salts in methanesulfonic acid. Physicochemical Mechanics of Materials. 2026. 62(3), 39-47.

Abstract

Corrosion resistance of iron in the presence of morpholine‑based quaternary ammonium salts (QASM) in methanesulfonic acid, selected as the background electrolyte, was inves­tigated. The adsorption and kinetic properties of QASM were studied using the coulostattic method. The adsorption equilibrium constants of QASM on iron in an acidic medium increase in the sequence C₁₁H₂₂BrNO < C₁₀H₁₈BrNO < C₁₈H₂₂ClNO < (C₁₆H₂₈NO₇Cl)_n. The obtained dependences of the corrosion current of iron on the electrode surface coverage by QASM indicate their significantly lower inhibiting effect than predicted by the “blocking” model, due to a substantial contribution of the energy retardation. The results confirm the prospects of using QASM as inhibitors of acid corrosion of steel and indicate the possibility of applying the most effective compounds (C₁₈H₂₂ClNO < (C₁₆H₂₈NO₇Cl)_n) under industrial conditions.

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