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<p>The corrosion behaviour of cast steel in a sulfuric acid environment H<sub>2</sub>SO<sub>4</sub> was previously studied using the drug amoxicillin (AMXL), with a focus on its inhibitory effects. Building upon this prior work, the current study investigates the corrosion inhibition of ampicillin (AMPL), which structurally differs from AMXL only by the absence of a hydroxyl group (-OH). The inhibition capability of both compounds was evaluated through weight loss and electrochemical techniques. Results demonstrate that the inhibition performance of both compounds decreases slightly with increasing temperature. The adsorption of AMXL and AMPL onto the steel surface was consistent with the Langmuir isotherm. SEM analysis confirmed the formation of a protective adsorbed film on the metal surfaces. Additionally, computational calculations were utilized to gain a deeper understanding of the inhibition mechanism. These methods provided a molecular-level view of the interactions between the inhibitors and the steel surface, supporting the experimental findings and highlighting the structural differences between the two molecules.</p>

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The Effectiveness of Expired Ampicillin in Corrosion Prevention for Cast Carbon Steel: Electrochemical and Theoretical Insights

  • 期刊论文

  • 发表日期：

    2026年3月12日

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  • Ayoub El Aloua,
  • Abdelmalek Matine,
  • Mohammed Oubahou,
  • Abdeslam El Bouari,
  • Omar Tanane

摘要

The corrosion behaviour of cast steel in a sulfuric acid environment H2SO4 was previously studied using the drug amoxicillin (AMXL), with a focus on its inhibitory effects. Building upon this prior work, the current study investigates the corrosion inhibition of ampicillin (AMPL), which structurally differs from AMXL only by the absence of a hydroxyl group (-OH). The inhibition capability of both compounds was evaluated through weight loss and electrochemical techniques. Results demonstrate that the inhibition performance of both compounds decreases slightly with increasing temperature. The adsorption of AMXL and AMPL onto the steel surface was consistent with the Langmuir isotherm. SEM analysis confirmed the formation of a protective adsorbed film on the metal surfaces. Additionally, computational calculations were utilized to gain a deeper understanding of the inhibition mechanism. These methods provided a molecular-level view of the interactions between the inhibitors and the steel surface, supporting the experimental findings and highlighting the structural differences between the two molecules.