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Article – Journal of Advanced Electrochemistry

Journal of Advanced Electrochemistry, Volume 2,Issue 4,2016 Pages 126-129

Investigation of Corrosion Protection Efficiency of Indigo Carmine on Carbon Steel in Acidic Environment
K. Palanisamy, A. Sekar*

The corrosion inhibition of indigo carmine in 0.5 M H2SO4 on carbon steel was investigated using weight loss and electrochemical methods in room temperature. The corrosion rates of carbon steel decreased with the increasing concentration of indigo carmine. The charge transfer resistance value increased with increase in concentration. The results of EIS and polarization curves demonstrated that film of the inhibitor was able to protect metal surface from corrosion effectively. The inhibition efficiency of indigo carmine decreased with increase in temperature, suggesting a physical adsorption mechanism, which was found to follow Langmuir adsorption isotherms. The obtained results were confirmed by surface examination using scanning electron microscope.

Keywords: Carbon Steel; Inhibitor; Langmuir Adsorption;