Corrosion Inhibition of Mild Steel by Aloes Extract in HCl Solution Medium

The corrosion inhibition of mild steel in 1.0 M HCl by the Aloes leaves extract has been studied using weight loss methods, potentiodynamic polarization and electrochemical impedance spectroscopy techniques. The results show that the inhibition efficiency increases with the increase of the extract concentration. The effect of temperature on the corrosion behavior of mild steel in 1M HCl with addition of the extract was also studied. The adsorption of the extract molecules on the steel surface obeys Langmuir adsorption isotherm and occurs spontaneously. The activation energy as well as other thermodynamic parameters for the inhibition process was calculated. These thermodynamic parameters show strong interaction between inhibitor and mild steel surface.