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Corrosion Inhibition by Prussian Blue

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Summary: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.
Main Authors:Kalaivani,R.
Other Authors:Narayanaswamy,B.; Selvi,J. A.; Amalraj,A. J.; Jeyasundari,J.; Rajendran,S.
Subject:corrosion inhibition carbon steel Prussian blue synergistic effect
Year:2009
Country:Portugal
Document type:article
Access type:open access
Associated institution:Fundação para a Ciência e Tecnologia
Language:English
Origin:SciELO Portugal

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