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The Behaviour of Phosphate Ions as Corrosion Inhibitor for Fe(II)–Fe(III) Hydroxycarbonate Green Rust

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Abstract

The oxidation of Fe(II)–Fe(III) hydroxycarbonate green rust GR(CO3 2−) in the presence of phosphate ions known as corrosion inhibitor is monitored by transmission Mössbauer spectroscopy. In the absence of phosphate, the first product of oxidation, previously called “amorphous active FeOOH” was identified as ferrihydrite which transformed by dissolution to goethite. The oxidation of GR(CO3 2−) in the presence of phosphate ions, which were added as hydrated phosphate salt, also involved the formation of ferrihydrite but not that of goethite. The dissolution of ferrihydrite is inhibited by the adsorption of phosphate ions as confirmed by X-ray photoelectron spectroscopy. The oxidation was slowed down and interpreted as due to the suppression of the catalytic effect of iron(III) hydroxide upon the oxidation of Fe(II).

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Authors and Affiliations

  1. Département de Chimie, Faculté des Sciences, Université Ibn Tofail, Kénitra, Morocco

    O. Benali

  2. Laboratoire de Chimie Physique et Microbiologie pour l'Environnement, UMR, 7564 CNRS, Université Henri Poincaré-Nancy 1, Equipe Microbiologie et Physique & Département Matériaux et Structures, ESSTIN, Université Henri Poincaré, 405 Rue de Vandoeuvre, F54600, Villers-lès-Nancy, France

    M. Abdelmoula & J.-M. R. Génin

  3. Laboratoire d'Etudes des Matériaux en Milieux Agressifs, Université de La Rochelle, Avenue Michel Crépeau, F17042, La Rochelle Cedex1, France

    Ph. Refait

Authors
  1. O. Benali
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  2. M. Abdelmoula
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  3. Ph. Refait
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  4. J.-M. R. Génin
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Benali, O., Abdelmoula, M., Refait, P. et al. The Behaviour of Phosphate Ions as Corrosion Inhibitor for Fe(II)–Fe(III) Hydroxycarbonate Green Rust. Hyperfine Interactions 139, 223–230 (2002). https://doi.org/10.1023/A:1021283308715

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