nionic Effect on the Acidic Corrosion of Aluminum and its Inhibition by Lupine Extract

Corrosion behavior of aluminum in 0.1 M HCl, 0.1 M HClO4 and 0.05 M H2SO4 solutions was studied using potentiodynamic polarization and electrochemical impedance spectroscopy (EIS) techniques.The results showed that the rate of corrosion of aluminum was arranged in the order: HCl > HClO4 > H2SO4.Lupine extract is an effective green inhibitor for the corrosion of aluminum in acidic solutions.The inhibition efficiency of the extract was found to increase with increasing the concentration of the extract.The obtained results showed that the lupine extract is effective in the order HClO4 > HCl > H2SO4.Theoretical fitting of the corrosion data to the Kinetic-thermodynamic model was tested to clarify the nature of adsorption.