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<p>This study explores the anticorrosion performance of two novel benzo[d]thiazole-based Gemini cationic surfactants (TBC) as inhibitors for AISI 1015 carbon steel in 1.0&#xa0;M HCl. A comprehensive investigation was carried out using weight loss technique (WL), potentiodynamic polarization (PDP), electrochemical impedance spectroscopy (EIS), scanning electron microscopy (SEM), energy dispersive X-ray spectroscopy (EDX), Fourier-transform infrared spectroscopy (FTIR), and density functional theory (DFT) calculations. The results demonstrated that both surfactants effectively inhibited corrosion by forming a protective film on the steel surface, as confirmed by impedance and surface analysis. The inhibition efficiency increased with rising inhibitor concentration but slightly decreased with temperature elevation (303–323&#xa0;K). Adsorption studies indicated that the inhibitors followed the Langmuir isotherm, with thermodynamic and kinetic parameters suggesting a combination of physical and chemical adsorption. Furthermore, the synergistic effects of CoCl<sub>2</sub>, MnCl<sub>2</sub>, and CuCl<sub>2</sub> salts were evaluated, enhancing the inhibitors’ performance and transforming their behavior into mixed-type inhibitors. This study highlights the promising potential of benzo[d]thiazole-based Gemini surfactants as efficient, cost-effective, and eco-friendly corrosion inhibitors for industrial applications.</p>

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Synergistic Corrosion Protection of Carbon Steel in 1.0 M HCl Using Benzo[d]thiazole-Based Gemini Cationic Surfactants: A Dual Experimental and Computational Approach

  • 期刊论文

  • 发表日期：

    2025年12月17日

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  • Samir A. Abd El-Maksoud,
  • Mohamed A. Migahed,
  • Mahmoud M. Gouda,
  • Farid I. El-Dossoki

摘要

This study explores the anticorrosion performance of two novel benzo[d]thiazole-based Gemini cationic surfactants (TBC) as inhibitors for AISI 1015 carbon steel in 1.0 M HCl. A comprehensive investigation was carried out using weight loss technique (WL), potentiodynamic polarization (PDP), electrochemical impedance spectroscopy (EIS), scanning electron microscopy (SEM), energy dispersive X-ray spectroscopy (EDX), Fourier-transform infrared spectroscopy (FTIR), and density functional theory (DFT) calculations. The results demonstrated that both surfactants effectively inhibited corrosion by forming a protective film on the steel surface, as confirmed by impedance and surface analysis. The inhibition efficiency increased with rising inhibitor concentration but slightly decreased with temperature elevation (303–323 K). Adsorption studies indicated that the inhibitors followed the Langmuir isotherm, with thermodynamic and kinetic parameters suggesting a combination of physical and chemical adsorption. Furthermore, the synergistic effects of CoCl2, MnCl2, and CuCl2 salts were evaluated, enhancing the inhibitors’ performance and transforming their behavior into mixed-type inhibitors. This study highlights the promising potential of benzo[d]thiazole-based Gemini surfactants as efficient, cost-effective, and eco-friendly corrosion inhibitors for industrial applications.