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Article Dans Une Revue Journal of Raman Spectroscopy Année : 2004

Structural characterisation of corrosion products on archaeological iron. An integrated analytical approach to establish corrosion forms

Résumé

The description and identification of corrosion products formed on archaeological iron artefacts needs various approaches at different observation scales. For this study, samples of five different sites were prepared using two techniques. The first one consists in cutting cross sections perpendicular to corrosion layers. This allows local observations and analysis of the corrosion layer stratigraphy at different levels. The second one consists in performing manual grinding or abrading of the corrosion layers starting from the current surface of the excavated artefact to the metal core. It allows the description of the successive layers and is well adapted for the analysis on a larger scale. In addition to these two observation scales, the identification of the iron oxides formed needs the coupling of several complementary techniques. Elementary compositions were determined by SEM-EDX and Electron Micro-Probe Analysis (EMPA). Structural identification was performed by X-ray micro Diffraction under synchrotron radiation (µXRD) and micro Raman spectroscopy. These analyses were performed on the same samples both with X-ray diffraction and Raman spectroscopy in order to ensure a reliable characterisation. In some cases there are some ambiguities or overlapping between signatures of different phases by micro X-rays diffraction (as maghemite/magnetite) or Raman spectroscopy (as goethite/magnetite) which can be raised by the association of the two methods. The final aim is to set up an analytical methodology that will be the best for the study of ancient iron corrosion products. It is the first step of the study of long term mechanisms of iron in soil.
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Dates et versions

hal-00315905 , version 1 (02-09-2008)

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Delphine D. Neff, Solenn Reguer, Ludovic Bellot-Gurlet, Philippe Dillmann, Régis Bertholon. Structural characterisation of corrosion products on archaeological iron. An integrated analytical approach to establish corrosion forms. Journal of Raman Spectroscopy, 2004, 35 (8-9), pp.739-745. ⟨10.1002/jrs.1130⟩. ⟨hal-00315905⟩
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