Electrochemical and surface analytical studies of synergistic effect of phosphonate, Zn2+ and ascorbate in corrosion control of carbon steel / B. V. Appa Rao in Materials and corrosion, Vol. 61 N° 4 (Avril 2010)  

Public ISBD [article]  inMaterials and corrosion > Vol. 61 N° 4 (Avril 2010) . - pp. 285–301 Titre : Electrochemical and surface analytical studies of synergistic effect of phosphonate, Zn2+ and ascorbate in corrosion control of carbon steel Type de document : texte imprimé Auteurs : B. V. Appa Rao, Auteur ; S. Srinivasa Rao, Auteur Année de publication : 2010 Article en page(s) : pp. 285–301 Note générale : Génie mécanique Langues : Anglais (eng) Mots-clés : Ascorbate  carbon steel  corrosion inhibition  EIS  FTIR  PBTC  polarisation  XPS  Zn2+ Résumé : Synergistic inhibition of corrosion of carbon steel in low chloride environment using ascorbate as a synergist along with 2-phosphonobutane-1,2,4-tricarboxylic acid (PBTC) and Zn2+ is presented. The synergistic effect of ascorbate has been established from the present studies. In the presence of ascorbate, lower concentrations of PBTC and Zn2+ are sufficient in order to obtain good inhibition, thus making this formulation more environmentally friendly. Potentiodynamic polarisation studies inferred that this mixture functions as a mixed inhibitor, predominantly cathodic. Impedance studies revealed that an immersion period of 24 h is necessary for the formation of the protective film, with a very high charge transfer resistance. The film is stable even at 60 °C in the presence of the inhibitor in the corrosive environment. The surface analysis by X-ray photoelectron spectroscopy (XPS) showed the presence of iron, oxygen, phosphorus, carbon and zinc in the protective film. The XPS spectra inferred the presence of oxides/hydroxides of iron(III), Zn(OH)2 and [Zn(II)–PBTC–ascorbate] complex in the surface film. This inference was further supported by the reflection absorption Fourier transform infrared spectrum of the surface film. A plausible mechanism of corrosion inhibition has been proposed. En ligne : http://onlinelibrary.wiley.com/doi/10.1002/maco.200905333/abstract [article] Electrochemical and surface analytical studies of synergistic effect of phosphonate, Zn2+ and ascorbate in corrosion control of carbon steel [texte imprimé] / B. V. Appa Rao, Auteur ; S. Srinivasa Rao, Auteur . - 2010 . - pp. 285–301. Génie mécanique Langues : Anglais (eng) in Materials and corrosion > Vol. 61 N° 4 (Avril 2010) . - pp. 285–301 Mots-clés : Ascorbate  carbon steel  corrosion inhibition  EIS  FTIR  PBTC  polarisation  XPS  Zn2+ Résumé : Synergistic inhibition of corrosion of carbon steel in low chloride environment using ascorbate as a synergist along with 2-phosphonobutane-1,2,4-tricarboxylic acid (PBTC) and Zn2+ is presented. The synergistic effect of ascorbate has been established from the present studies. In the presence of ascorbate, lower concentrations of PBTC and Zn2+ are sufficient in order to obtain good inhibition, thus making this formulation more environmentally friendly. Potentiodynamic polarisation studies inferred that this mixture functions as a mixed inhibitor, predominantly cathodic. Impedance studies revealed that an immersion period of 24 h is necessary for the formation of the protective film, with a very high charge transfer resistance. The film is stable even at 60 °C in the presence of the inhibitor in the corrosive environment. The surface analysis by X-ray photoelectron spectroscopy (XPS) showed the presence of iron, oxygen, phosphorus, carbon and zinc in the protective film. The XPS spectra inferred the presence of oxides/hydroxides of iron(III), Zn(OH)2 and [Zn(II)–PBTC–ascorbate] complex in the surface film. This inference was further supported by the reflection absorption Fourier transform infrared spectrum of the surface film. A plausible mechanism of corrosion inhibition has been proposed. En ligne : http://onlinelibrary.wiley.com/doi/10.1002/maco.200905333/abstract

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