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Mechanisms of long-term anaerobic corrosion of iron archaeological artefacts in seawater |
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| Authors: | C Rémazeilles D Neff F Kergourlay E Foy E Conforto E Guilminot S Reguer Ph Refait Ph Dillmann |
| Affiliation: | aLaboratoire d’Etude des Matériaux en Milieux Agressifs, EA3167, Université de La Rochelle, Bâtiment Marie Curie, Avenue Michel Crépeau, F-17042 La Rochelle cedex 01, France;bLaboratoire Archéomatériaux et Prévision de l’Altération LPS /SIS2M, CEA Saclay, LMC IRAMAT UMR5060 CNRS, France;cSynchrotron SOLEIL, L’Orme des Merisiers Saint-Aubin, BP 48 91192 Gif-sur-Yvette Cedex, France;dCentre Commun d’Analyse, Université de La Rochelle, 5 Perspective de l’Océan, F-17071 La Rochelle cedex 09, France;eArc’Antique, 26 rue de la haute forêt, 44300 Nantes, France |
| Abstract: | An iron ingot immersed during 2000 years at 12 m depth in the sea has been examined with the help of a combination of microscale techniques. This methodology allowed us to show that the main phase precipitated during the immersion is an iron hydroxychloride (β-Fe2(OH)3Cl) that is characteristic of corrosion in anoxic and chlorinated medium. Moreover locally on the external part of the corrosion products sulphur containing phases have been identified as mackinawite (FeS) in nanocrystalline or slightly oxidised state. The presence of this phase could be explained by the activity of sulphate-reducing bacteria. The presence of β-Fe2(OH)3Cl could be interpreted via a thermodynamic modelling taking into account the environmental conditions. |
| Keywords: | A Archaeological artefacts A Steel C Marine corrosion C Sulphate-reducing bacteria C Rust |
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