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Evaluating the Behavior of Aluminum Corrosion in Hydrochloric Acid in the Presence Aqueous Extract of Olive Seeds

Aisha M Al-Turkustani, Khadijah M Emran

Corrosion of aluminum in HCl solutions and its inhibition by aqueous extract of Olive seeds (OS) extract have been reported. The study was carried out using weight loss, hydrogen evolution at 30 and 40°C and the results were supporting by surface examination study (SES) and electrochemical impedance spectroscopy (EIS) measurements at 30°C. Experimental results indicated that the corrosion of aluminum increased with increasing acid concentration and rising temperature. The presence of OS extract inhibit the general and pitting corrosion of aluminum in HCl solutions. This effect was remarkably increased by increasing the concentration of OS extract. The inhibition efficiency increased with rising temperature in the presence of inhibitor, especially at low concentrations. The adsorption of the inhibitor was also found to be spontaneous, chemical and consistent with the assumptions of Langmuir adsorption isotherm.