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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. <o:p></o:p> </p

engineering

Synergistic Effect of &amp;lt;i&amp;gt;Allium&amp;lt;/i&amp;gt; &amp;lt;i&amp;gt;cepa&amp;lt;/i&amp;gt;-Zn&amp;lt;sup&amp;gt;2+&amp;lt;/sup&amp;gt; System on the Corrosion of Carbon Steel in Ground Water