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<p>To address costly corrosion and material degradation, we report the development of a new quaternary ammonium salt (Q-Ar) via functionalization of a Schiff base with benzyl chloride through a quaternization reaction, intended as a potential corrosion inhibitor for carbon steel (C-steel) in 1&#xa0;M HCl. FT-IR and <sup>1</sup>H NMR spectroscopy confirmed the chemical structure of Q-Ar. Electrochemical potentiodynamic polarization (PDP) studies revealed that Q-Ar acted as mixed-type inhibitor and achieved corrosion inhibition efficiency 93.94% at 35 ppm. Electrochemical impedance spectroscopy (EIS) confirmed strong adsorption layer with charge transfer resistance (R<sub>ct</sub>) of 737.3 Ω.cm<sup>2</sup>. The adsorption behavior followed the Langmuir isotherm model, suggesting chemical adsorption reaction of Q-Ar at room temperature over C-steel surface according to standard adsorption energy values (∆G<sub>ads</sub>) of -43.2&#xa0;kJ.mol<sup>− 1</sup> for Q-Ar. Activation thermodynamic parameters of C-steel reaction in presence of Q-Ar suggested its inhibition action forming barrier film over C-steel surface as reflected by the increase in activation energy (Eₐ) from 21.60&#xa0;kJ mol<sup>− 1</sup> for the uninhibited system to 42.79&#xa0;kJ mol<sup>− 1</sup> in the presence of Q-Ar. Scanning electron microscopy (SEM) confirmed the protective effect of Q-Ar, showing that the C-steel surface remained largely free of corrosion products compared with the severely corroded blank sample. Energy-dispersive X-ray (EDX) analysis further verified this observation by revealing a marked reduction in iron oxide formation in the presence of Q-Ar. Theoretically, the lower energy gap (ΔE<sub>gap</sub>) of the optimized Q-Ar molecule and the higher adsorption energy (E<sub>ads</sub>) of the Q-Ar/Fe(110) system indicate strong interactions between the Q-Ar and the C-steel surface, corroborating the experimental observations.</p>

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Corrosion inhibition mechanism of a functionalized schiff base–derived quaternary ammonium salt for carbon steel in 1 M HCl: electrochemical, adsorption, and theoretical studies

  • 期刊论文

  • 出版模式：

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  • 发表日期：

    2026年4月4日

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  • Mohamed I. Ahmed,
  • M. Abd-El-Raouf,
  • M. A. Migahed,
  • Magdy A.M. Ibrahim,
  • Sameh A. Rizk,
  • N. M. El Basiony

摘要

To address costly corrosion and material degradation, we report the development of a new quaternary ammonium salt (Q-Ar) via functionalization of a Schiff base with benzyl chloride through a quaternization reaction, intended as a potential corrosion inhibitor for carbon steel (C-steel) in 1 M HCl. FT-IR and 1H NMR spectroscopy confirmed the chemical structure of Q-Ar. Electrochemical potentiodynamic polarization (PDP) studies revealed that Q-Ar acted as mixed-type inhibitor and achieved corrosion inhibition efficiency 93.94% at 35 ppm. Electrochemical impedance spectroscopy (EIS) confirmed strong adsorption layer with charge transfer resistance (Rct) of 737.3 Ω.cm2. The adsorption behavior followed the Langmuir isotherm model, suggesting chemical adsorption reaction of Q-Ar at room temperature over C-steel surface according to standard adsorption energy values (∆Gads) of -43.2 kJ.mol− 1 for Q-Ar. Activation thermodynamic parameters of C-steel reaction in presence of Q-Ar suggested its inhibition action forming barrier film over C-steel surface as reflected by the increase in activation energy (Eₐ) from 21.60 kJ mol− 1 for the uninhibited system to 42.79 kJ mol− 1 in the presence of Q-Ar. Scanning electron microscopy (SEM) confirmed the protective effect of Q-Ar, showing that the C-steel surface remained largely free of corrosion products compared with the severely corroded blank sample. Energy-dispersive X-ray (EDX) analysis further verified this observation by revealing a marked reduction in iron oxide formation in the presence of Q-Ar. Theoretically, the lower energy gap (ΔEgap) of the optimized Q-Ar molecule and the higher adsorption energy (Eads) of the Q-Ar/Fe(110) system indicate strong interactions between the Q-Ar and the C-steel surface, corroborating the experimental observations.