Comparative study of the inhibition of extracts from the peel and seeds of Citrus Aurantium against the corrosion of steel in molar HCl solution

Abstract

The corrosion inhibition of mild steel in 1 M HCl solution with different concentrations of citrus Aurantium peel and seeds extracts were studied using Tafel extrapolation, weight loss measurements, and electrochemical impedance spectroscopy (EIS). It was found that citrus aurantium peel and seeds extracts acted as slightly cathodic inhibitors and inhibition efficiencies increased with the increase of extracts concentration. The adsorption of the molecules of the extracts on the mild steel surface was in accordance with the Langmuir adsorption isotherm. The results showed citrus aurantium peel and seeds extracts could serve as a corrosion inhibitor of the mild steel in hydrochloric acid environment.