article · International Journal of Electrochemical Science
Three expired drugs, Solo Sept (SS), Slim-lax (SL), and Well Derm (WD), have been tested as corrosion inhibitors for corrosion of copper alloy (C10100) in 2.0 M HNO3 solution. Three experimental methods such as weight loss measurements, potentiodynamic polarization (PDP), and electrochemical impedance spectroscopy (EIS) were applied in this study. These expired drugs function as effective inhibitors, according to the experimental findings. The efficacy of inhibition rises with increasing drug concentration and falls as temperature rises. From PDP, the examined drugs that worked as mixed-type inhibitors. EIS measurements showed a remarkable increase in the charge transfer resistance and decreases in the capacity of the double layer of the corroding copper in 2.0 M HNO3 solution with increasing drug concentration. The inhibition power of these drugs was interpreted in term of its adsorption on the C10100 surface according to Langmuir isotherm. The inverse effect of temperature on drug efficiency as well as the small negative values of ∆G°ads (-20.84, -20.52 and -20.51 kJ/mol) for SS, SL and WD respectively, supports the physical adsorption of drugs on the C10100 surface. All results showed consistency with IE order (SS > SL > WD). The adsorption thermodynamic functions were estimated. The corrosion inhibition performance of SS was confirmed through SEM (scanning electron microscope) and FTIR.
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DOI: 10.1016/j.ijoes.2024.100657
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