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International Journal of Pharmaceutical Chemistry and Analysis


Application of expired drugs in corrosion inhibition of mild steel


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Author Details: Neeraj Kumar Gupta, CSA Gopal, Vandana Srivastava, MA Quraishi

Volume : 4

Issue : 1

Online ISSN : 2394-2797

Print ISSN : 2394-2789

Article First Page : 8

Article End Page : 12


Abstract

Present work deals with the investigation of corrosion inhibition of mild steel using two expired drugs namely Atenolol and Nifedipine in 1 M HCl solution. Their inhibition properties were evaluated using electrochemical, scanning electron microscopy (SEM) and DFT methods. Atenelol and Nifidipine showed efficiency of 91.30 and 93.91% at low concentration of 200 ppm respectively. Polarization study reveals that the expired drugs inhibit corrosion of mild steel by suppressing both anodic and cathodic reactions occurring on the mild steel surface thus acting as mixed type inhibitors. EIS study shows that the investigated drug increases the polarization resistance by adsorbing on the metal/electrolyte interface. The electrochemical results were well supported by SEM as well as DFT study.

Keywords:
Expired Drugs, Mild steel, Acid corrosion, SEM, DFT