The inhibition efficiency (IE) of an aqueous extract of beet root (BR) in controlling corrosion of carbon steel in well water in the absence and presence of Zn 2+ has been evaluated by mass loss method.The formulation consisting of 4 mL of BR extract and 50 ppm Zn 2+ offers 98% inhibition efficiency to carbon steel immersed in well water.A synergistic effect exists between BR extract and Zn 2+ .Addition of N-Cetyl-N,N,Ntrimethylammonium bromide (CTAB) does not change the excellent inhibition efficiency of the BR -Zn 2+ system.The BR -Zn 2+ system shows excellent IE up to 7 days.Polarization study reveals that this formulation controls the cathodic reaction predominantly.AC impedance spectra reveal that a protective film is formed on the metal surface.FTIR spectra reveal that the protective film consists of Fe 2+ -betanin complex and Zn(OH) 2 .The film is found to be UV -fluorescent.
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Selvi et al. (2009) studied this question.
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