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 Zn 2+ has been studied by weight loss method. The formulation consisting of 3 mL Allium cepa extract, 50 ppm of Zn 2+ and 50 ppm of sodium pattassium tartarate which offers 97% inhibition efficiency. The synergistic effect exists between onion-Zn 2+ -tartarate system. The addition of N-cetyl-N,N,N- trimethylammonium bromide on onion-Zn 2+ -tartarate system does not change the excellent inhibition efficiency. Polarization study shows that the onion-Zn 2+ -tartarate system functions as a cathodic inhibitor. AC impedance spectra reveal s that a protective film is formed on the metal surface. The UV fluorescent spectra indicate the possibility of formation of Fe 2+ -onion complex and also Zn 2+ -onion complex in solution. Thus the protective film is found to be UV fluorescent.
KeywordsCarbon SteelAllium cepaCorrosion Inhibition EfficiencyGround Water
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