Philippe Dillmann

Interfacial layers at a nanometre scale on iron corroded in carbonated anoxic environments

Two tests of iron corrosion in compacted clay and clay slurry were performed for several years. The corrosion systems, and especially the interfacial layer between the metal and the corrosion products, were investigated post mortem by SEM-FEG, μRaman, MET and STXM. An Fe(III) oxide layer systematically developed at a nanometer scale between the metal and an outer layer of carbonates. Its presence could explain the slowing down of the corrosion rate usually observed for these systems. Depending of the compactness of the environment the nature of the interfacial layer is not the same.

Influence of iron corrosion on nuclear glass alteration processes: nanoscale investigations of the iron-bearing phases

ABSTRACT A carbon steel container including nuclear glass has been altered for 2 years in Andra’s Underground Research Laboratory to simulate the behaviour of waste package. Post-mortem analyses at different scales (macro–micro–nano) have been performed to identify neoformed phases on iron corrosion products (ICP) and in the glass alteration layer (GAL). It has been shown at nanometric scale that important quantities of iron and silicon were found in the GAL and in the ICP respectively. Using a comparative approach with phyllosilicate references, STXM, at Si-K edge, suggests presence of trioctahedral species in the GAL and in ICP. Relevant fits of the STXM spectra are obtained with a Fe-rich chlorite for the nanostructured GAL, which could be formed according to chloritisation mechanism. This paper is part of a supplement on the 6th International Workshop on Long-Term Prediction of Corrosion Damage in Nuclear Waste Systems.

Material degradation foreseen in the very long term: the case of glasses and ferrous metals

HAL is a multi-disciplinary open access archive for the deposit and dissemination of scientific research documents, whether they are published or not. The documents may come from teaching and research institutions in France or abroad, or from public or private research centers. L’archive ouverte pluridisciplinaire HAL, est destinée au dépôt et à la diffusion de documents scientifiques de niveau recherche, publiés ou non, émanant des établissements d’enseignement et de recherche français ou étrangers, des laboratoires publics ou privés. Material degradation foreseen in the very long term: the case of glasses and ferrous metals Stéphane Gin, Philippe Dillmann, Nick Birbilis

From Archaeological Sites to Nanoscale: The Quest of Tailored Analytical Strategy and Modelling

Last developments of nano probes allows scientists of Cultural Heritage to assess a new kind of information that is crucial in the different topics concerned by the field: determining ancient manufacturing processes, studying use and provenance of ancient artefacts, revealing the degradation processes and developing adapted cleaning and conservation treatments. Nevertheless to be useful, these nanoscale approaches must be integrated in a tailored multi-step analysis. The final aim of these approaches will be to reach understanding and/or reliable modelling of the behaviours of the ancient systems. A first part of this chapter will review the issues in Cultural Heritage and the nature of the physico-chemical data that can be collected on the systems. In a second part, a selection of examples dealing with nano characterisation in Cultural Heritage will allow us to present several up to date techniques and methodologies employed in Cultural Heritage science. Then, the third part of the chapter will review some of the different modelling attempts that where already made in the domain of Cultural Heritage, and that were based on the use of physico-chemical descriptions at different scales. The challenge for the next future will be, for different kind of materials and environments, to propose multiscale models from nano to functional scale. Some key steps to face these challenges bridging the gap between multiscale descriptive characterisation and numerical modelling are reviewed here.

Chapter 14:Corrosion of Ferrous Archaeological and Cultural Heritage Artefacts

Since the 19th century, scholars and scientists have been interested in the corrosion of archaeological objects. On the other hand, since this time there has been a hiatus between the specialists of the preservation of the archaeological objects and the academic and industrial corrosion specialists....

Objectif et actions du réseau Cai-rn

Le reseau Cai-rn (Competences archeometriques interdisciplinaires – reseau national) de la mission pour I’interdisciplinarite vise a federer la communaute des acteurs de l’archeometrie, eminemment interdisciplinaire, autour de competences communes liees a l’utilisation des sciences analytiques autour de l’etude des systemes anciens : artefacts ou archives environnementales, interactions anciennes ou futures des societes avec leur environnement, savoir-faire technologiques de ces societes. Les...