Abstract

KALAIVANI, R. et al. Corrosion Inhibition by Prussian Blue. Port. Electrochim. Acta [online]. 2009, vol.27, n.2, pp.177-187. ISSN 0872-1904.

The inhibition efficiency (IE) of K₃[Fe(CN)₆] in controlling corrosion of carbon steel in aqueous solution containing 60 ppm of Cl^- in the presence and absence of Zn²⁺ has been evaluated by weight loss method. The formulation consisting of 100 ppm K₃[Fe(CN)₆] and 50 ppm Zn²⁺ offers 98% inhibition efficiency to carbon steel immersed in aqueous solution containing 60 ppm Cl^-. A synergistic effect exists between K₃[Fe(CN)₆] and Zn²⁺. As immersion period increases, the inhibition efficiency of K₃[Fe(CN)₆]─ Zn²⁺ 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.

Keywords : corrosion inhibition; carbon steel; Prussian blue; synergistic effect.

        · text in English     · English ( pdf )