Mechanisms of the dechlorination of iron archaeological artefacts extracted from seawater |
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| Authors: | F Kergourlay C Rémazeilles D Neff E Foy E Conforto E Guilminot S Reguer Ph Dillmann F Nicot F Mielcarek J Rebière Ph Refait |
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| Affiliation: | aLaboratoire Archéomatériaux et Prévision de l’Altération, SIS2M, CEA Saclay, F-91191 Gif sur Yvette Cedex, France;bLMC IRAMAT UMR5060 CNRS, F-90010 Belfort Cedex, France;cLaboratoire d’Etude des Matériaux en Milieux Agressifs, EA3167, Université de La Rochelle, Av. Michel Crépeau, F-17042 La Rochelle Cedex 01, France;dFédération de Recherche en Environnement pour le Développement Durable (FR-EDD), FR CNRS 3097, Centre Commun d’Analyses, 5 Allées de l’Océan, F-17071 La Rochelle Cedex 9, France;eLaboratoire ARC’ANTIQUE, 26 Rue de la haute forêt, F-44300 Nantes, France;fSynchrotron SOLEIL, L’orme des Merisiers – Saint Aubin – BP 48, F-91192 Gif sur Yvette Cedex, France;gLaboratoire de Conservation Restauration et Recherches, Centre Archéologique du Var, 19 rue Frédéric Mineur, F-83300 Draguignan, France |
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| Abstract: | Treatments based on the immersion of iron artefacts in NaOH or KOH solutions with or without cathodic polarisation of the metal core, used for conservation purposes, were applied to Gallo-Roman iron ingots excavated from the Mediterranean Sea. The transformation of the initial layer of β-Fe2(OH)3Cl was followed with time. The resulting phases were characterised by a complete set of multi-scale complementary techniques. It could be demonstrated that the main process involved successively the transformation of β-Fe2(OH)3Cl into Fe(OH)2 and the oxidation of Fe(OH)2 into α-/δ-FeOOH and magnetite. Cathodic polarisation accelerated, via migration processes, the removal of chloride ions. |
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| Keywords: | A Iron B SEM C Rust B Raman spectroscopy B X-ray diffraction |
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