Ocimum basilicum L. Oil as Corrosion Inhibitor for Aluminium in Hydrochloric Acid Solution

摘要

Ethanol solution of Ocimum basilicum L. oil was studied as corrosion inhibitor for aluminium in 0.5 MHCl. Its inhibition effect was performed using weight loss measurements, potentiodynamicpolarization and EIS methods. Potentiodynamic polarization measurements show that presence of basiloil in HCl solution influence on current densities decreasing. EIS results confirmed that investigatedcompound formed protective layer on aluminium surface. Thermodynamic adsorption parametersshow that compounds present in basil oil are adsorbed on aluminium surface by an exothermic process,indicating that the adsorption mechanism is physisorption, with the adsorptive layer having anelectrostatic character.