Potentiodynamic polarization studies of Cefadroxil and Dicloxacillin drugs on the corrosion susceptibility of aluminium AA6063 in 0.5 M nitric acid

Abstract

The inhibition effectiveness of Cefadroxil (C) and Dicloxacillin (D) drugs on aluminium in 0.5 M nitric acid solution have been holistically studied using potentiodynamic polarization techniques, weight loss measurements, computational studies and structural characterization. The structural characterizations were carried with the aid of scanning electron microscope equipped with energy dispersive spectrometer (SEM/EDS), optical microscope (OPM) and XRD. Potentiodynamic polarization test revealed the corrosion protectiveness and adsorbing ability of Cefadroxil and Dicloxacillin drugs on aluminium (Al). The mixed inhibitive characteristics of Cefadroxil and Dicloxacillin drugs were confirmed through the Tafel plot, which further established their predominant effect on the anodic reaction as a result of Ecorr value shift to more positive sides. The combined effect of Cefadroxil and Dicloxacillin drugs reduced the exchange in current density and corrosion rate drastically from 484 μA/cm2 to 199 μA/cm2 and 0.4502 mm/year to 0.2152 mm/year respectively. 44.4% increase in microhardness was achieved and Inhibition efficiency of 58.9% was accomplished. Keywords: Polarization, Aluminium, Interfaces, Passivation, Cefadroxil, Dicloxacillin