Inhibitive Action of Alhagi Maurorum Plant Extract on the Corrosion of Copper in 0.5 M H₂SO₄

摘要

The effect of Alhagi Maurorum plant extract on the corrosion of copper in aqueous 0.5M sulphuric acid was investigated by electrochemical impedance spectroscopy (EIS), potentiodynamic polarization, and weight loss techniques. The plant extract act as cathodic-type inhibitor and serve as an effective inhibitor for the corrosion of copper in sulphuric acid media. Theoretical fitting of different isotherms, Langmuir, Flory–Huggins, and the kinetic–thermodynamic model, were tested to clarify the nature of adsorption. The thermodynamic parameters of the corrosion reaction of copper in acidic medium in the absence and the presence of the extract have been determined.