Excellent Anticorrosion Behavior of Ruta Graveolens Extract (RGE) for Mild Steel in Hydrochloric Acid: Electro Analytical Studies on the Effect of Time, Temperature, and Inhibitor Concentration

Abstract

The corrosion inhibition behavior of Ruta graveolens extract (RGE) for mild steel in 1 M HCl is studied using gravimetric and electrochemical techniques. 1-4 V/V% RGE is added to the corrosive media and analyzed. Gravimetric measurements conducted at different time intervals reveal the potential activity of RGE in the system investigated. RGE exhibits 95 % inhibition efficiency in the investigated system for 7 days of exposure time. Electrochemical impedance spectroscopic studies show that mild steel is protected 98 % from corrosion in 1 M HCl in the presence of RGE. Potentiodynamic polarization study agrees this observation showing 99 % inhibition efficiency and also reveals the mixed type inhibition behavior of RGE. One of the active constituents of Ruta graveolens, Rutin is also monitored for its inhibition behavior and is found to be active. The theoretical parameters obtained for rutin also stands for the good inhibition potential of the extract. Both RGE and Rutin show a decrease in inhibition efficiency as the temperature raised. Adsorption behavior of RGE is according to Langmuir isotherm and that of Rutin obeys Temkin isotherm.

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