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Synergistic Effect of Allium cepa-Zn2+ System on the Corrosion of Carbon Steel in Ground Water

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Journal: Engineering
ISSN 1947-3931

Volume: 05;
Issue: 02;
Start page: 178;
Date: 2013;
Original page

Keywords: Carbon Steel | Allium cepa | Corrosion Inhibition Efficiency | Ground Water

ABSTRACT
The corrosion inhibition efficiency (IE) of an aqueous extract Allium cepa (onion) in controlling the corrosion of carbon steel ground water in absence and presence of with Zn2+ has been studied by weight loss method. The formulation consisting of 3 mL Allium cepa extract, 50 ppm of Zn2+ and 50 ppm of sodium pattassium tartarate which offers 97% inhibition efficiency. The synergistic effect exists between onion-Zn2+-tartarate system. The addition of N-cetyl-N,N,N- trimethylammonium bromide on onion-Zn2+-tartarate system does not change the excellent inhibition efficiency. Polarization study shows that the onion-Zn2+-tartarate system functions as a cathodic inhibitor. AC impedance spectra reveals that a protective film is formed on the metal surface. The UV fluorescent spectra indicate the possibility of formation of Fe2+-onion complex and also Zn2+-onion complex in solution. Thus the protective film is found to be UV fluorescent.
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