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Influence of Melonic acid on the Corrosion Inhibition of Sodium Metavanadate in Chloride Medium

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Author Affiliations

  • 1Corrosion Research Centre, Department of Chemistry, GTN Arts College, Dindigul-624005, Tamil Nadu, INDIA
  • 2 Department of Chemistry, RVS School of Engineering and Technology, Dindugul-624005, Tamil Nadu, INDIA

Res.J.chem.sci., Volume 2, Issue (6), Pages 72-81, June,18 (2012)

Abstract

The inhibition efficiency (SMV) – melonic acid system is controlling corrosion of carbon steel in an aqueous solution containing 60 ppm of Cl- has been evaluated by weight loss method.250 ppm of SMV has 56% of IE. Addition of melonic acid to SMV improves the inhibition efficiency of the system. Formulation consisting of 250 ppm of SMV and 250 ppm of melonic acid has 96% IE. Synergistic effects exist between SMV and melonic acid, if the synergism parameters are greater than 1. Mechanistic aspects of corrosion inhibition have been studied by electro chemical studies like polarization and electro chemical impedance spectroscopy. FTIR spectra reveals that the protective film consists of Fe2+ - SMV complex and Fe2+ - melonic acid complex, the protective film has been analyzed by fluorescence spectra, SEM and AFM .

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