Comparative Theoretical and Experimental Studies on Corrosion Inhibition of Aluminum in Acidic Media by the Antibiotics Drugs

Abstract

The inhibition performances of tetracycline and streptomycin on aluminum corrosion in HCl solution was studied by weight loss, Tafel polarization, SEM, molecular dynamics method and quantum chemical calculations. Polarization curves indicated that the studied tetracycline and streptomycin act as mixed-type inhibitors and the inhibition efficiencies are found to follow the order, tetracycline < streptomycin. The adsorption of inhibitors obeys the Temkin adsorption isotherm. DFT calculations were performed for comparison with the inhibition efficiencies determined experimentally. Molecular dynamics (MD) simulations were also applied to find the most stable configuration and adsorption energies of streptomycin and tetracycline molecules on Al (1 1 0) surface. The results obtained from experimental and theoretical are in reasonable agreement.