Corrosion Inhibition Efficiency of Expired Nitazoxanide Drug on Carbon Steel in Hydrochloric Acid Solution

摘要

The corrosion inhibition of the expired Nitazoxanide drug was investigated in inhibiting the carbonsteel (CS) corrosion in 1M HCl using chemical method (weight loss (WL)), two electrochemical test(potentiodynamic polarization (PP) and electrochemical impedance spectroscopy (EIS) techniques)combined with surface analysis. The results show that the expired Nitazoxanide drug are effective andattain their action as mixed type corrosion inhibitors, and their corrosion inhibition affinities wereincrease with the rising of their concentration and lower temperature. The adsorption of the expiredNitazoxanide drug on the CS surface was obeyed Langmuir isotherm. The adsorption thermodynamicparameters calculated show that the adsorption was a spontaneous, endothermic process accompaniedby an increase in the entropy. The maximum data of the inhibition approached to 90% within thepresence of 300 ppm expired Nitazoxanide drug using potentiodynamic polarization process. The resultsof surface analysis and the electrochemical technique were in a great agreement.