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<p>The corrosion-inhibition performance of para-dimethylaminobenzaldehyde (p-DMAB) on mild steel in 1 M HCl was evaluated using weight-loss analysis, electrochemical methods, adsorption investigations, theoretical calculations, and surface characterisation techniques. The corrosion rate decreased significantly as the inhibitor concentration increased, as indicated by weight-loss results. By increasing charge-transfer resistance and decreasing corrosion current density, p-DMAB functions as a mixed-type inhibitor, according to electrochemical studies (OCP, Tafel, and EIS). The Langmuir isotherm was followed by p-DMAB adsorption on the steel surface, and thermodynamic characteristics suggested a spontaneous mixed physisorption–chemisorption mechanism. Strong electronic interactions between the inhibitor molecule and the metal surface were confirmed by DFT calculations. Effective film generation was confirmed by surface investigations employing optical profilometry, SEM, AFM, and XPS, which showed smoother, less damaged surfaces in the presence of the inhibitor. Overall, p-DMAB demonstrates excellent potential as an efficient corrosion inhibitor for mild steel in acidic environments.</p> Graphical abstract <p></p>

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Surface modification and inhibition mechanism caused by p-dimethylaminobenzaldehyde towards mild steel (ASTM A36) protection

  • 期刊论文

  • 发表日期：

    2026年4月15日

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  • Little Jewelcy Arockiaraj,
  • Sathiyanarayanan Kulathu,
  • Jegadesan Subbiah,
  • Ramalinga Viswanathan Mangalaraja,
  • Andrea Sorrentino,
  • Anandan Sambandam

摘要

The corrosion-inhibition performance of para-dimethylaminobenzaldehyde (p-DMAB) on mild steel in 1 M HCl was evaluated using weight-loss analysis, electrochemical methods, adsorption investigations, theoretical calculations, and surface characterisation techniques. The corrosion rate decreased significantly as the inhibitor concentration increased, as indicated by weight-loss results. By increasing charge-transfer resistance and decreasing corrosion current density, p-DMAB functions as a mixed-type inhibitor, according to electrochemical studies (OCP, Tafel, and EIS). The Langmuir isotherm was followed by p-DMAB adsorption on the steel surface, and thermodynamic characteristics suggested a spontaneous mixed physisorption–chemisorption mechanism. Strong electronic interactions between the inhibitor molecule and the metal surface were confirmed by DFT calculations. Effective film generation was confirmed by surface investigations employing optical profilometry, SEM, AFM, and XPS, which showed smoother, less damaged surfaces in the presence of the inhibitor. Overall, p-DMAB demonstrates excellent potential as an efficient corrosion inhibitor for mild steel in acidic environments.

Graphical abstract