EXPERIMENTAL AND DENSITY FUNCTION THEORY CALCULATIONS TO INVESTIGATE THE ADSORPTION OF AN ANTI-INFLAMMATORY DRUG ON ALUMINUM SURFACE IN ACID SOLUTION

Abstract

The literature dealing with aluminium behavior in acid media in the presence of an anti-inflammatory drug is studied in order to understand its action mechanism, protective film formed and the possibility of its application according to the inhibition efficiency achieved. Aceclofenac, an anti-inflammatory drug is studied and its inhibitive performance on aluminium corrosion was studies by both dry and wet lab studies. Dry lab process using DFT is used to explore the relationship between the inhibitor molecular property and its inhibition efficiency. Wet lab studies have been carried out using weight loss, Tafel polarization and impedance measurements to evaluate their inhibitive performance in both 1M HCl and 0.5M H2SO4. PZC were calculated from impedance studies in order to understand the mechanism of inhibition. Polarization studies prove mixed type of inhibition. Good inhibition efficiency from weight loss studies was evidenced in both the acid medium, furnishing an inhibition efficiency of more than 80 %. The inhibition effect results from the adsorption of the inhibitor molecule via the lone pair of electrons on the hetero atoms together with the adjacent aromatic ring, on the metal surface forming a protective complex film. According to the results summarized, aluminium corrosion can be successfully inhibited by the drug used in the study in both the acid solutions. Results obtained from dry lab process are in good agreement with those recorded from wet lab experiments.