Inhibitive and adsorption properties of sparfloxacin for the corrosion of mild steel in HCl have been studied using gravimetric, gasometric and thermometric methods of monitoring corrosion. Sparfloxacin is found to inhibit the corrosion of mild steel in HCl. At 303 K, inhibition efficiency obtained for sparfloxacin from gravimetric, gasometric and thermometric methods were found to range from 79.68 to 97.47%, 86.67 to 96.67% and 76.34 to 82.30% respectively. Inhibition efficiency of sparfloxacin increased with increase in concentration of sparfloxacin but decreased with increase in temperature. Activation energies for the inhibited reactions were higher than the value obtained for the blank. Sparfloxacin is found to be an adsorption inhibitor for the corrosion of mild steel. The adsorption of sparfloxacin on the surface of mild steel was found to be spontaneous, exothermic and its adsorption characteristics were best described by Langmuir adsorption isotherm. The use of sparfloxacin as an inhibitor for the corrosion of mild steel in HCl is advocated in this study.
Key word: Corrosion of mild steel, HCl, inhibition, sparfloxacin.