Garlic (Alium Sativum) As A Corrosion Inhibit...

Garlic (Alium Sativum) As A Corrosion Inhibitor For Aluminum Alloy In Trichloroacetic Acid

Author Name : Jetal. J. Patel, K. N. Patel

ABSTRACT

The present work investigates the corrosion of aluminum alloy in Trichloroacetic acid containing leaves extract by mass loss measurement and electrochemical techniques. The inhibitor efficiency of AS extract was found to vary with concentration was kept uniform for 24 hours and temperatures was kept uniform for 2 hours. Experimental results revealed that inhibition efficiency (I.E %) increased with increasing inhibitor concentration. As temperatures increased, percentage of inhibition decreases. The value of free energy of adsorption (DG⁰_ads), energy of activation (E_a), enthalpy of adsorption (DH⁰_ads) and entropy of adsorption (DS⁰_ads) were calculated. The result also showed that, adsorption of inhibitor molecules on the surface of aluminum alloy followed Temkin, Freundlich and Langmuir adsorption isotherm model. Potentiodynamic study and Electrochemical Impedance Spectroscopy (EIS) implies that film SSdeveloped on aluminum alloy   using the both of Trichloroacetic acid exhibits good corrosion resistance.

Keywords: Garlic, Aluminum alloy, Trichloroacetic acid (TCA), Corrosion, Inhibitor