An investigation on mitigation of corrosion of mildsteel by Origanum vulgare in acidic medium

The restraining impact of plant extract towards corrosion of mild steel has been reviewed in this paper. The purpose of the present investigation is the utilization of Origanum vulgare (oregano) extract as environment friendly corrosion inhibitor of mild steel in HCl medium. Methods include weight loss, quantum chemical calculations and SEM. The outcomes revealed that the efficiency of Origanum vulgare increased with increasing its concentration reaching maximum of 91.2% at 1000 mg/L at 30 o C. Results showed that adsorption followed Langmuir adsorption isotherm. The adsorption attributes of chosen extract were hypothetically assessed by quantum chemical and the morphology of metal was studied by using SEM analysis. KEY WORDS : Mild steel, Origanum vulgare , Corrosion inhibitor, HCl, Corrosion inhibition, Weight loss Bull. Chem. Soc. Ethiop. 2019 , 33(1), 159-168 DOI: https://dx.doi.org/10.4314/bcse.v33i1.16