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.
