A gossypol derivative as an efficient corrosion inhibitor for St2 steel in 1 M HCl + 1 M KCl: An experimental and theoretical investigation
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Date
26 JanuaryAuthor
Elik, MustafaElyor, Berdimurodov
Abduvali, Kholikov
Khamdam, Akbarov
Lei, Guo
Aboubakr, M. Abdullah
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E. Berdimurodov, A. Kholikov, K. Akbarov, L. Guo, A.M. Abdullah, M. Elik A gossypol derivative as an efficient corrosion inhibitor for St2 steel in 1 M HCl+ 1 M KCl: an experimental and theoretical investigation J. Mol. Liq., 329 (2021), Article 115475Abstract
Currently, there are several types of corrosion inhibitors were studied. The new type of corrosion inhibitor based
on a gossypol derivative was first introduced. The anti-corrosion performance of 6-aminopenicillanic acid sodium
gossypol (APASG) for St2 steel in a 1 M HCl + 1 M KCl solution was reported for the first time, and the inhibition
properties of this material were fully characterized by gravimetric analysis, thermodynamic analysis, potentiodynamic polarization (PDP), electrochemical impedance spectroscopy (EIS), electrochemical noise (EN) analysis,
electrochemical frequency modulation (EFM), density functional theory (DFT), molecular dynamics (MD) simulations, scanning electron microscopy (SEM) and energy dispersive X-ray spectrometry (EDX). The obtained results show that APASG is an excellent anti-corrosion inhibitor (97% at 100 mg/L/0.104 mM) at intermediate
temperatures (303−333K). APASG adsorbed onto a metal surface by a physical and chemical adsorption mechanism, as shown by the Langmuir adsorption isotherms. Electrochemical analyses show that APASG acts as a
mixed-type inhibitor. The thermodynamic adsorption data were measured and discussed. SEM-EDX tests of
the inhibited steel sample show that the inhibitor significantly improved the surface morphology. DFT calculations indicated that the broadly stretched linked functional groups (hydroxyl and carboxyl) and heteroatoms (nitrogen, oxygen and sulfur) in the inhibitor structure are responsible for the inhibition efficiency of APASG. The
obtained DFT and MD simulation data supported the experimental results.
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