Surface Adsorption and Corrosion Resistance Performance of Acacia concinna Pod Extract: An Efficient Inhibitor for Mild Steel in Acidic Environment

摘要

AbstractThe object of this study is to experimentally evaluate the inhibition properties of Acacia concinna (A. concinna) extractin a 0.5 M sulphuric acid media for mild steel. The protective film-formation study was done using UV–Vis spectroscopy.Surface film composition and morphology were examined by scanning electron microscope and atomic force microscope.Electrochemical impedance spectroscopy (EIS) and potentiodynamic spectroscopy (PDS) were carried out to explain thecombined (cathodic and anodic) nature and cathodic dominance of A. concinna. Results of electrochemical analyses showedthat 250 mg/L inhibitor concentration had the highest performance and efficiency (proved to be 94% by EIS and 92% by PDSresults). The formed film in this sample showed the highest hydrophobicity and literally no obvious forms of corrosion. Thetheoretical results showed the comparative adsorption of phytochemicals on the steel. All acquired outcomes confirmed thatA. concinna extract can develop an efficient protective layer and resist the corrosion procedure.