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Corrosion inhibitors in controlling metal failure had been the practice for handling the menace of corrosion. Most of synthetic inhibitors is expensive and not environmental friendly, hence, the need for cheap, renewable, non-hazardous and green inhibitors to handle environmental issues. In this particular study, the inhibitory properties of Epimedium grandiflorum plant extract on the corrosion of mild steel in HCl acidic media was investigated. The gasometric, weight loss and the linear polarization methods were used in the study with adsorption isotherms (Langmuir, Freundlich, Frumkin and Temkin) validating the state of the reaction. The concentration of the extract was prepared in serial dilution of 10 50% using a stock solution of 1.75 M HCl. Mild steel coupons of known elemental compositions were immersed in test solutions of both stock solution and extract solutions. In the gasometric method, a decrease in volume of hydrogen gas evolved was observed as concentration of extract increases. Result from the weight loss shows similar trend of inhibitory behaviour for the weight loss method as the weight loss experienced by the coupons reduces as extract concentration increases. The Taffel plot for the extract indicates good inhibitive properties with inhibition efficiency increasing with extract concentration. In all the three methods studied, the maximum inhibition efficiency was observed in the 50% extract concentration. The extract fits best into the Freundlich isotherm indicating physisorption. This study showed that this particular plant extract is an effective inhibitor in suppressing the corrosion on the surface of the metal.

Corrosion inhibitive properties ofEpimedium grandiflorumon mild steel in HCl acidic media