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<p>This study presents a novel trifunctional epoxy prepolymer, triglycidyloxy sulfanilic acid (TGSA), as an effective corrosion inhibitor for mild steel in 1M HCl. Electrochemical methods were employed in conjunction with surface characterization and theoretical modeling to evaluate the efficacy of TGSA. The potentiodynamic polarization (PDP) findings demonstrated a substantial decline in the corrosion current density from 976.2&#xa0;<i>µ</i>A/cm<sup>2</sup> to 58.13&#xa0;<i>µ</i>A/cm<sup>2</sup> at a concentration of 10⁻<sup>3</sup>M TGSA. This result attained an inhibition efficiency of 94.04%, signifying a significant reduction in corrosion rate. Electrochemical impedance spectroscopy (EIS) findings indicated an augmentation in charge transfer resistance from 32.88 Ω&#xa0;cm<sup>2</sup> to 259.3 Ω&#xa0;cm<sup>2</sup> at 10⁻<sup>3</sup>M TGSA, thereby attaining 87.31% protection. The adsorption of TGSA was subsequently analyzed using the Langmuir isotherm model, which yielded negative free energy values of up to –&#xa0;42.28kJ/mol. This observation indicates that chemisorption is the predominant form of interaction. TGSA exhibited a high level of inhibition efficiency (88.66%) at elevated temperatures, indicative of a substantial activation energy of 38.98kJ/mol. DFT studies demonstrated a reduced energy gap for TGSA-H, suggesting enhanced reactivity. MD/MC simulations, on the other hand, exhibited robust surface binding, with adsorption energies of –&#xa0;160.05&#xa0;kcal/mol and –&#xa0;130.25&#xa0;kcal/mol for TGSA and TGSA-H<sup>+</sup>, respectively. Radial distribution functions confirmed that the chemisorption was facilitated by Fe-O, Fe-S, and Fe-N interactions. Subsequent SEM/EDS analyses provided further validation of the protective film formation. In summary, TGSA has been demonstrated to be an effective and thermally stable protective measure in the context of acidic environments prevalent in the gas and oil industry.</p>

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Synthesis and Characterization of New Epoxy Prepolymer as an Effective Corrosion Inhibitor for Metal in Gas and Oil Industry

  • 期刊论文

  • 发表日期：

    2026年7月1日

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  • Oussama El Ghali,
  • Omar Dagdag,
  • Adil Errahimi,
  • Hansang Kim,
  • Abderrahim El Bachiri,
  • Avni Berisha,
  • Elyor Berdimurodov,
  • Khasan Berdimuradov,
  • Rida Allah Belakhmima,
  • Mohamed Rafik

摘要

This study presents a novel trifunctional epoxy prepolymer, triglycidyloxy sulfanilic acid (TGSA), as an effective corrosion inhibitor for mild steel in 1M HCl. Electrochemical methods were employed in conjunction with surface characterization and theoretical modeling to evaluate the efficacy of TGSA. The potentiodynamic polarization (PDP) findings demonstrated a substantial decline in the corrosion current density from 976.2 µA/cm2 to 58.13 µA/cm2 at a concentration of 10⁻3M TGSA. This result attained an inhibition efficiency of 94.04%, signifying a significant reduction in corrosion rate. Electrochemical impedance spectroscopy (EIS) findings indicated an augmentation in charge transfer resistance from 32.88 Ω cm2 to 259.3 Ω cm2 at 10⁻3M TGSA, thereby attaining 87.31% protection. The adsorption of TGSA was subsequently analyzed using the Langmuir isotherm model, which yielded negative free energy values of up to – 42.28kJ/mol. This observation indicates that chemisorption is the predominant form of interaction. TGSA exhibited a high level of inhibition efficiency (88.66%) at elevated temperatures, indicative of a substantial activation energy of 38.98kJ/mol. DFT studies demonstrated a reduced energy gap for TGSA-H, suggesting enhanced reactivity. MD/MC simulations, on the other hand, exhibited robust surface binding, with adsorption energies of – 160.05 kcal/mol and – 130.25 kcal/mol for TGSA and TGSA-H+, respectively. Radial distribution functions confirmed that the chemisorption was facilitated by Fe-O, Fe-S, and Fe-N interactions. Subsequent SEM/EDS analyses provided further validation of the protective film formation. In summary, TGSA has been demonstrated to be an effective and thermally stable protective measure in the context of acidic environments prevalent in the gas and oil industry.