INHIBITING EFFECT OF CEFPODOXIME PROXETIL PRODRUG ON ALUMINUM CORROSION IN 0.1M SULPHURIC ACID

Studies on the corrosion inhibition potentials of Cefpodoxime proxetil (CP) was carried out using gravimetric, gasometric and Scanning Electron Microscopy (SEM) techniques. The results from weight loss and hydrogen evolution experiments show that the inhibition efficiency of Cefpodoxime proxetil increases with increase in concentration but decreases with increasing temperature. The adsorption of the inhibitor on aluminum surface was found to be consistent with Langmuir adsorption isotherm. From calculated values of activation energy, free energy of adsorption and the variation of inhibition efficiency with temperature, it was deduced that the adsorption of the inhibitors favours the mechanism of physical adsorption. The SEM results indicated that there is a formation of protective coverage over the surface of the metal.