Corrosion Inhibition Study of Expired Acetazolamide on Mild Steel in Dilute Hydrochloric Acid Solution
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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.
KeywordsExpired drug Mild steel Corrosion inhibitor SEM-EDX FTIR
Mr Lakhan Prakash Chaudhari gratefully acknowledges the research grant provided by the North Maharashtra University Jalgaon under Vice Chancellor Research Motivational Scheme [VCRMS] (Grant No. NMU/11A/VCRMS/Budjet-2015/Science-8/65/2016). Authors are also thankful to Head of the U.I.C.T. department of North Maharashtra University, Jalgaon for SEM-EDX analysis facility.
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