Expired Podocip drug as potential corrosion inhibitor for carbon steel in acid chloride solution

• P. Dohare¹, D.S. Chauhan^1,2 and M.A. Quraishi³

¹ Department of Chemistry, Indian Institute of Technology, Banaras Hindu University, Varanasi 221005, India
² Present Address: C-8, Ashokpuram, Dafi, Varanasi-221011, India
³ Center of Research Excellence in Corrosion, Research Institute, King Fahd University of Petroleum and Minerals, Dhahran 31261, Saudi Arabia

Abstract: The application of expired drugs as corrosion inhibitors provides a cost effective and environmentally benign alternative to otherwise tedious and costly disposal/degradation process. In this context, we have investigated the use of expired Podocip (PCIP) drug as corrosion inhibitor for carbon steel in 1 M HCl by weight loss and electrochemical methods. Polarization curves revealed that the inhibiting action of the PCIP is mixed-type. The adsorption of PCIP on carbon steel surface obeys the Langmuir isotherm. Impedance analysis showed that the presence of inhibitor considerably affects the charge transfer resistance and the double layer capacitance of carbon steel surface. SEM and AFM studies evidenced the formation of a protective film over metal surface.

Keywords: Podocip; carbon steel; electrochemical analysis; adsorption

Int. J. Corros. Scale Inhib., 2018, 7, no. 1, 25-37 PDF (1 400 K)
doi: 10.17675/2305-6894-2018-7-1-3

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