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<p>The influence of donor (methoxy) and acceptor (nitro) groups on the benzene-benzamide ring of the synthesized [(sulfamoylphenyl)carbamothioyl]benzamides (SCBs) was investigated to evaluate their impact on the corrosion inhibition ability of X65 carbon steel (CS) in a CO<sub>2</sub>-saturated environment. A comprehensive investigation using electrochemical methods (open circuit potential, electrochemical impedance spectroscopy, and potentiodynamic polarization) was performed at temperatures between 293 and 353 K. The results were supported by computational simulations by density functional theory, Monte Carlo, molecular dynamics, film density, and the diffusion coefficient. The formation of a protective film on the CS surface was examined via field-emission scanning electron microscopy, energy-dispersive x-ray spectroscopy, atomic force microscopy, and scanning Kelvin probe microscopy. The results showed that SCBs had a high inhibitory effect at low and high temperatures, with an efficiency of around 97% at a concentration of 200 mg L<sup>−1</sup>. It was observed that the SCBs acted as anodic corrosion inhibitors, and the Langmuir adsorption isotherm accurately described their chemisorption behavior. The computational outcomes concurred well with the experimental results.</p>

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Influence of Donor and Acceptor Groups on the Inhibition Performance of Benzamide Derivatives in CO2-Saturated Media: Experimental and Theoretical Researches

  • 期刊论文

  • 发表日期：

    2025年2月7日

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  • Danial Iravani,
  • Naser Esmaeili,
  • Esmaeil Akbarinezhad,
  • Avni Berisha,
  • Valbonë Mehmeti

摘要

The influence of donor (methoxy) and acceptor (nitro) groups on the benzene-benzamide ring of the synthesized [(sulfamoylphenyl)carbamothioyl]benzamides (SCBs) was investigated to evaluate their impact on the corrosion inhibition ability of X65 carbon steel (CS) in a CO2-saturated environment. A comprehensive investigation using electrochemical methods (open circuit potential, electrochemical impedance spectroscopy, and potentiodynamic polarization) was performed at temperatures between 293 and 353 K. The results were supported by computational simulations by density functional theory, Monte Carlo, molecular dynamics, film density, and the diffusion coefficient. The formation of a protective film on the CS surface was examined via field-emission scanning electron microscopy, energy-dispersive x-ray spectroscopy, atomic force microscopy, and scanning Kelvin probe microscopy. The results showed that SCBs had a high inhibitory effect at low and high temperatures, with an efficiency of around 97% at a concentration of 200 mg L−1. It was observed that the SCBs acted as anodic corrosion inhibitors, and the Langmuir adsorption isotherm accurately described their chemisorption behavior. The computational outcomes concurred well with the experimental results.