Abstract
The corrosion inhibition of mild steel by a drug substance, namely piroxicam, in HCl (1 M) solution was investigated. The Electrochemical Impedance Spectroscopy (EIS) and potentiodynamic polarization technique were used. EIS measurements showed larger capacitive loops in the presence of piroxicam. The inhibition efficiency was found to be dependent on the piroxicam concentration. From the polarization curves the corrosion current density (\({{i}_{{{\text{cor}}}}}\)) decreased from 109.4 to 16.93 μA/cm2. The adsorption mode of the drug obeys to the Langmuir isotherm model. The free energy of adsorption (∆Gads) revealed a spontaneous process with a mixed interaction type i.e. physical and chemical. The kinetic study was conducted using the weight loss technique at the optimal piroxicam concentration (600 ppm). The density functional theory (DFT) method was used to determine the principal species, neutral or ionized drug, involved the inhibition mechanism. Scanning electron microscopy (SEM) was carried out for the surface characterization of the carbon steel after immersion in the aggressive medium in the absence and presence of the drug substance.
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Addoun, A., Trari, M. & Ferroukhi, O. Corrosion Control of Mild Steel Material in HCl Electrolyte by a Non-Steroidal Anti-Inflammatory Drug: Electrochemical and Kinetic Study. Prot Met Phys Chem Surf 56, 826–833 (2020). https://doi.org/10.1134/S2070205120040024
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DOI: https://doi.org/10.1134/S2070205120040024