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Variable Temperature Mössbauer Study of Some Rust Converters

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Abstract

The conversion properties of 15 different combinations of rust converters have been studied. The results indicate that the rust layer without conversion is composed of spinel phase, akaganeite, magnetically ordered goethite, and lepidocrocite. On the other hand, besides the mentioned iron oxides and oxyhydroxides, the converted-rust layer consists of iron phosphate and iron tannate. Mössbauer spectrometry has allowed us to classify the degree of conversion of the different formulations according to both the tannic acid content and the mixture of the isopropyl and terbutanol alcohol. It was found that there is a specific mixture of alcohol for each tannic concentration for which the power of conversion is greatly enhanced. It is also concluded that non-stoichiometric spinel phase underwent the greater transformation of about 90%, followed by magnetically blocked goethite, in which 30% of it was transformed. In contrast, akaganeite seems to be not noticeably affected by the converters. It was not possible to assess the effect on lepidocrocite.

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Authors and Affiliations

  1. Corrosion and Protection Group, University of Antioquia, P.O. Box 1226, Medellín, Colombia

    F. Bolívar, C. A. Barrero, J. Minotas & A. L. Morales

  2. Solid State Group, University of Antioquia, P.O. Box 1226, Medellín, Colombia

    C. A. Barrero & A. L. Morales

  3. Laboratoire de Physique de l'Etat Condensé, UMR CNRS 6087, Université du Maine, 72085, Le Mans, Cedex 9, France

    J.-M. Greneche

Authors
  1. F. Bolívar
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  2. C. A. Barrero
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  3. J. Minotas
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  4. A. L. Morales
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  5. J.-M. Greneche
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Bolívar, F., Barrero, C.A., Minotas, J. et al. Variable Temperature Mössbauer Study of Some Rust Converters. Hyperfine Interactions 148, 219–225 (2003). https://doi.org/10.1023/B:HYPE.0000003783.55435.27

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  • DOI: https://doi.org/10.1023/B:HYPE.0000003783.55435.27

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