Corrosion Mitigation of Carbon Steel in Acidic Media Using Glimepiride: A Sulfonylurea Derivative as an Eco-Friendly Inhibitor

Abd El Maksoud, S.A.; Fouda, Abd El Aziz; Badawy, Haby

doi:10.21608/ajbas.2025.377231.1253

Corrosion Mitigation of Carbon Steel in Acidic Media Using Glimepiride: A Sulfonylurea Derivative as an Eco-Friendly Inhibitor

Document Type : Original Article

Authors

¹ Department of chemistry, Faculty of Science, Port Said University, Port Said 42522, Egypt

² Department of Chemistry, Faculty of Science, Mansoura University, Mansoura-35516, Egypt

10.21608/ajbas.2025.377231.1253

Abstract

This study investigates the effectiveness of expired Glimepiride drug, a sulfonylurea derivative, as a corrosion inhibitor for carbon steel (CS) degrading in 1.0 M hydrochloric acid solutions. Experimental and theoretical procedures examine glimepiride inhibition efficiency as Weight loss (WL) measurements, electrochemical techniques (potentiodynamic polarization (PP), electrochemical frequency modulation (EFM), and electrochemical impedance spectroscopy (EIS)) and surface characterization methods (Fourier transform infrared spectroscopy (FTIR), atomic force microscopy (AFM), scanning electron microscopy (SEM), and X-ray photoelectron spectroscopy (XPS)) were employed. The inhibition efficiency increased with both rising inhibitor concentration and increasing temperature (303–318 K). Adsorption studies indicated that the inhibitors followed the Temkin isotherm, with thermodynamic and kinetic parameters suggesting a chemical adsorption. glimepiride act as mixed type inhibitor as a result from electrochemical techniques. SEM and XPS studies revealed that the inhibitor was adsorbed on the surface of carbon steel, resulting in a considerable reduction in corrosion rate. Theoretical calculations gave useful information on Glimepiride's molecular characteristics, supporting experimental findings that Glimepiride acts as a corrosion inhibitor.

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