Du nucléaire à la conservation du patrimoine - Compréhension des mécanismes de corrosion des alliages ferreux sur le long terme grâce à la caractérisation multi-échelles

Delphine Neff 1
1 LAPA - UMR 3685 - Laboratoire Archéomatériaux et Prévision de l'Altération
NIMBE UMR 3685 - Nanosciences et Innovation pour les Matériaux, la Biomédecine et l'Energie (ex SIS2M)
Abstract : The corrosion of metals such as steel presents a high variability depending on the environments of alteration (aqueous aerated and deaerated atmosphere, binders and concrete ...) and durations considered. As part of my research, in order to understand these mechanisms over long periods the study of archaeological artefacts corroded over tens to hundreds of years has been chosen. This research was crucial in many application areas, ranging from the preservation of objects of cultural heritage and studies for the storage and disposal of radioactive waste in deep geological environment. In this area the archaeological artefacts constitute unparalleled analogues for the study of corrosion of steel elements embedded in the multi-barrier to separate the radionuclides from the biosphere. Characterization of corrosion systems was conducted through a methodology based on the coupling of multiscale techniques for materials characterization (SEM-EDS, Raman microspectroscopy, microXRD, XAS synchrotron radiation ...) providing information on the location, morphology, composition and structure of the crystalline phases present in a layer of corrosion products. Moreover, studies of the reaction processes and of the chemical or electrochemical reactivity of the systems by recorrosion experiments of archaeological objects in labeled medium (D2O, O18) or under external stimuli (chemical, electrochemical) have highlighted phenomena controlling the corrosion process at the micrometric scale. Perspectives of my research are the study of further constraints of the corrosion processes such as the presence of bacteria in the environment, the study of processes at the nanoscale (TEM, STXM) but also the methodological development of new analytical approaches based on a combination of morphological imaging methods (FEG-SEM), composition (EDS), structure (μXRD under synchrotron radiation) or hyperspectral (Raman microspectroscopy) to determine the synergy of the nano and microscale phenomena at the scale of an object. Taken together, these studies should lead to develop further protocols for diagnosis, treatment and conservation of cultural objects and reinforce the mechanistic models developed for the design of ferrous elements included in the storage facilities of radioactive waste.
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Habilitation à diriger des recherches
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Delphine Neff. Du nucléaire à la conservation du patrimoine - Compréhension des mécanismes de corrosion des alliages ferreux sur le long terme grâce à la caractérisation multi-échelles. Matériaux. Université Pierre et Marie Curie - Paris VI, 2012. ⟨tel-00741750⟩

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