Abstract
The present work was done with dual intentions. The primary aim was to attenuate the acid corrosion of 6061 aluminum alloy by green approach. While doing so, an attempt was made to use the expiry date pharmaceutical product Streptomycin (SEPT) injection. This unique method could provide the best possible pathway for the utility of otherwise useless, non-eco-friendly expiry date drugs. Corrosion inhibition studies were performed using electrochemical techniques. Experimental settings were augmented to attain the highest possible efficacy of SEPT by changing its concentration and temperature. Experimental values were close-fitted into proper adsorption isotherm. Surface morphology studies like SEM and AFM were performed to confirm the adsorption of inhibitor. Streptomycin emerged as an exceptionally good inhibitor with an efficacy of 77% for the addition of just 1 ppm of the inhibitor at 303 K. Outcome of the work provided a unique pathway for utility expiry date drug, thereby minimizing the environmental pollution.
Highlights
Materials used in industries are expected to exhibit certain qualities, of which corrosion resistance lies at the forefront [1]
Experimental procedures described in the literature were implemented for performing potentiodynamic polarization (PDP) and impedance spectroscopy (EIS) techniques [12]
Surface studies of the alloy were done scanning electron microscopy [JEOL JSM─6380L.] In addition, the roughness of the surface was determined by Atomic Force Microscopy (AFM) studies [1B342 Innova model]
Summary
Materials used in industries are expected to exhibit certain qualities, of which corrosion resistance lies at the forefront [1]. Antibacterial drugs are a class of green corrosion inhibitors, which are reported to be verified to attenuate corrosion of engineering materials in various mediums [9, 10]. Antibacterial drugs such as Ampicillin, Cloxacillin, Flucloxacillin, and Amoxicillin were confirmed to be highly effective in preventing acid corrosion of aluminum. When a drug approaches near expiry date or expiry date, it has no medical applications and can be used as corrosion inhibitors This will solve one of the major environmental issues. The work is undertaken successfully by utilizing the expiry date drug Streptomycin (injection) for corrosion mitigation of 6061 aluminum alloy
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