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<p>The study of the inhibition performance of two Schiff bases namely: 2, 2′-((1E,1′E)-((4-methyl-1, 3-phenylene) bis (benzylidene)) bis (methylethylidene)) bis (4-methoxyphenol) (L1), and 2,4-bis (2-hydroxy-3-methoxy benzaldehyde) diiminotoluene (L2) against corrosion of carbon steel X48 was carried out in a one molar HCl solution utilizing the weight loss measurements (WL), the potentiodynamic polarization (PDP), and the electrochemical impedance spectroscopy (EIS). Electrochemical and gravimetric analysis revealed that the protection efficiency (IE) of L1 and L2 increased with higher concentrations, reaching inhibition efficiencies of 96.3 and 95.6%, respectively, at 2.5 × 10<sup>−3</sup> M using WL method. These inhibitors are competently adsorbed by a mixed (chemisorption and physisorption) process on the surface of the steel as indicated by the free energies values ΔG<sup>o</sup><sub>ads</sub>. =  − 32.3 to − 37.67 kJ/mol. The Tafel curves proved that the two inhibitors are mixed-type and their adsorption follows the Langmuir isotherm. Thermodynamic activation and adsorption parameters were calculated and discussed. The presence of these compounds as inhibitors in the solution increases the charge transfer resistance and reduces the capacity of the double layer. The surface morphology was evaluated using different techniques. The results obtained confirm that the theoretical studies are in close agreement with the experimental observations. The results obtained from electrochemical studies are in good agreement.</p>

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Corrosion Inhibition of X48 Carbon Steel by Two Schiff Bases in HCl Solution: Experimental and Computational Investigations

  • 期刊论文

  • 发表日期：

    2025年10月13日

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  • Ameera Abd Almajeed Madi Abdallah,
  • Fatiha Benghanem,
  • Djahida Haffar,
  • Linda Toukal,
  • Abd El-Aziz S. Fouda

摘要

The study of the inhibition performance of two Schiff bases namely: 2, 2′-((1E,1′E)-((4-methyl-1, 3-phenylene) bis (benzylidene)) bis (methylethylidene)) bis (4-methoxyphenol) (L1), and 2,4-bis (2-hydroxy-3-methoxy benzaldehyde) diiminotoluene (L2) against corrosion of carbon steel X48 was carried out in a one molar HCl solution utilizing the weight loss measurements (WL), the potentiodynamic polarization (PDP), and the electrochemical impedance spectroscopy (EIS). Electrochemical and gravimetric analysis revealed that the protection efficiency (IE) of L1 and L2 increased with higher concentrations, reaching inhibition efficiencies of 96.3 and 95.6%, respectively, at 2.5 × 10−3 M using WL method. These inhibitors are competently adsorbed by a mixed (chemisorption and physisorption) process on the surface of the steel as indicated by the free energies values ΔGoads. =  − 32.3 to − 37.67 kJ/mol. The Tafel curves proved that the two inhibitors are mixed-type and their adsorption follows the Langmuir isotherm. Thermodynamic activation and adsorption parameters were calculated and discussed. The presence of these compounds as inhibitors in the solution increases the charge transfer resistance and reduces the capacity of the double layer. The surface morphology was evaluated using different techniques. The results obtained confirm that the theoretical studies are in close agreement with the experimental observations. The results obtained from electrochemical studies are in good agreement.