Inhibition of the corrosion of mild steel in HCl by sparfloxacin

Abstract

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.