The inhibition efficiency (IE) of K 3 [Fe(CN) 6 ] in controlling corrosion of carbon steel in aqueous solution containing 60 ppm of Clin the presence and absence of Zn 2+ has been evaluated by weight loss method. The formulation consisting of 100 ppm K 3 [Fe(CN) 6 ] and 50 ppm Zn 2+ offers 98% inhibition efficiency to carbon steel immersed in aqueous solution containing 60 ppm Cl -. A synergistic effect exists between K 3 [Fe(CN) 6 ] and Zn 2+ . As immersion period increases, the inhibition efficiency of K 3 [Fe(CN) 6 ]─ Zn 2+ system decreases. 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 Prussian blue and Zn(OH) 2 . The film is found to be UV fluorescent.

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