R. Kalaivani,1 B. Narayanaswamy,2 J. A. Selvi,3 A. J. Amalraj,4 J. Jeyasundari,3 S. Rajendran3,*
1 Department of Chemistry, Kalasalingam University, Anandnagar, Krishnankoil 626 190. Srivilliputhur, India
2 Department of Chemistry, Thiagarajar College of Engineering, Madurai-625006. India
3*Corrosion Research Centre, Post Graduate and Research Department of Chemistry, GTN Arts College, Dindigul-624005, India
4Department of Chemistry, Loyola College, Chennai, India
Received 25 October 2008; accepted 17 February 2009
]]>Abstract
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.
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* Corresponding author. E-mail address: srmjoany@sify.com
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