Abstract
The corrosion inhibition properties of expired acetazolamide for mild steel in acidic solution were studied by gravimetric and Tafel polarization and Electrochemical Impedance spectroscopy. The inhibition efficiency evaluated by all methods was in good agreement with each other. Results suggest that the inhibition efficiency increases with increase in concentration and decreases with temperature. Inhibitor obeys Langmuir adsorption isotherm and shows inhibition efficiency up to 93% at 313 K for 500 ppm solution. Tafel polarization study suggests that it acts as mixed-type inhibitor. Thermodynamic parameters indicate that the adsorption process is spontaneous. Shifting of frequencies in FTIR spectra and SEM-EDX analysis confirms the adsorption of inhibitor on mild steel surface. Application of expired drug as corrosion inhibitor is useful to reduce environmental pollution and economically beneficial to pharmaceutical industries.
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