Vitex agnus castus plant extract as Safe corrosion inhibitor for carbon steel 1018 in 1M hydrochloric acid

Abstract

The corrosion inhibition effectiveness of "Vitex agnus castus"(VAC) as corrosion inhibitor for carbon steel (CS) 1018 in 1.0 M HCl was confirmed using chemical and electrochemical methods. The data resulted from the measurements indicated that the inhibition efficiency (%IE) is dependent on both temperature and concentration of the extract. Tafel polarization (TP) data indicated that the extract behaves as mixed kind inhibitor. Langmuir's adsorption isotherm was found to be the best fit. Morphology of the surface was examined using scanning electron microscopy (SEM), Fourier transform infrared (FTIR) and atomic force microscopy (AFM) which confirmed the existence of a protective film of extract molecules on CS 1018 surface.