Evaluation of Corrosion Inhibition Properties of Pharmaceutically Active Compound Cefotaxime Sodium on Mild Steel Surface in Sulfuric Acid Medium

Abstract

Cefotaxime sodium is applied in various concentrations in 0.55 yds sulfuric acid for the mild steel and analyzed through weight loss, potentiodynamic polarization, and electrochemical impedance spectroscopy studies from 298 to 338 K. It gives better inhibition activity at lower temperature. Activation parameters, Gibbs free energy, enthalpy, and entropy of the reaction have been calculated. It was found that the inhibition process follows physical adsorption and the adsorption process follows Langmuir’s adsorption isotherm. The inhibition behavior is supplemented by the surface study through atomic force microscopy and found that the inhibited surface has less roughness than the uninhibited surface.