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Anise Extract as Green Corrosion Inhibitor for Carbon Steel in Hydrochloric Acid Solutions

A. S. Fouda, G. Y. Elewady, K. shalabi, S. Habouba

Anise extract, was investigated as green corrosion inhibitor of carbon steel in 1 M HCl solution using weight loss, potentiodynamic polarization, electrochemical impedance spectroscopy (EIS) and electrochemical frequency modulation (EFM) techniques. Surface morphology was tested using scanning electron microscope (SEM) and energy dispersive X-ray (EDX). The adsorption of the inhibitors on carbon steel surface was found to obey the Langmuir’s adsorption isotherm. The activation and adsorption parameters were calculated and discussed