The inhibition efficiencies of ampicillin and flucloxacillin expired drugs on mild steel (MS) corrosion
in 1.0 M sulfuric acid medium was examined at 20oC using weight loss (WL), and electrochemical
potentiodynamic polarization (PDP) and electrochemical impedance spectroscopy (EIS) techniques.
Examined expired drugs are set to be efficient inhibitors for MS corrosion in sulfuric acid medium. The
experimental outcomes of weight loss technique displayed that the inhibition performances of the
investigated expired drugs augmented with increasing concentrations of such drugs and reduced by
raising the temperature. The observed high inhibition efficiencies of the studied expired drugs may be
owing to powerful adsorption of the drug species on MS surface resulting in formation of protective
layers. Adsorption of the tested expired drugs on the MS surface was set to accord with Langmuir
adsorption isotherm. The assessed thermodynamic parameters supported the mechanism of physical
adsorption of the inhibitors. |
