The influence of Co-Amoxiclav on the corrosion inhibition of mild steel in 1 N hydrochloric acid solution

• P.A. Jeeva¹, G.S. Mali¹, R. Dinakaran¹, K. Mohanam¹ and S. Karthikeyan²

¹ School of Mechanical Engineering, Vellore Institute of Technology [VIT], Vellore, 632014 India
² Department of Chemistry, School of Advanced Sciences, Vellore Institute of Technology [VIT], Vellore, 632014 India

Abstract: The influence of an antibiotic Co-Amoxiclav is studied for use as a low cost and ecofriendly corrosion inhibitor for mild steel in acidic environment in particular to 1 N hydrochloric acid medium. The corrosion inhibition effect and the performance of the inhibitor has been extensively studied by weight loss studies, Tafel polarization experiments, electrochemical impedance spectroscopy and hydrogen permeation measurements. The dosage of the antibiotic was varied from 5×10^–4 M to 15×10^–4 M. It has been established that the inhibitor performed well and showed 88% inhibition efficiency at 15×10^–4 M concentration of Co-Amoxiclav molecules. The electrochemical studies such as Potentiodynamic polarization proposes that the antibiotic viz., Co-Amoxiclav acted as a mixed type of inhibitor. The increased charge transfer resistance and decreased double layer capacitance obtained from electrochemical impedance spectroscopy confirmed that said antibiotic has performed as good inhibitor in 1 N hydrochloric acid medium. Hydrogen permeation measurements showed that the compound acts as cathodic inhibitor, but predominantly under mixed control. It has been noticed that a definite correlation exists between chemical and electrochemical studies for the inhibition action of Co-Amoxiclav molecules on the corrosion of mild steel in 1 N HCl medium. Diffused reflectance spectroscopy (DRS) studies established that only the mere adsorption of antibiotic on mild steel surface took place and not influence on the surface morphology. The adsorption of this compound on mild steel surface obeys Temkin’s adsorption isotherm.

Keywords: corrosion test, electrochemical techniques, adsorption

Int. J. Corros. Scale Inhib., 2019, 8, no. 1, 1-12 PDF (1 206 K)
doi: 10.17675/2305-6894-2019-8-1-1

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