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Développement d’une méthodologie analytique par spectrométrie ToF-SIMS afin d’identifier l’origine, abiotique ou biotique, de produits de corrosion

Abstract : Biocorrosion is the result of corrosion induced by micro-organisms and affects a wide range of economic activity sectors including oil & gas industry, nuclear industry, drinking water systems, and archeological materials. Fighting biocorrosion requires identifying and understanding the corrosion mechanisms. The aim of this work is the development of an analytical method based on Time-of-Flight Secondary Ion Mass Spectrometry (ToF-SIMS) in order to discriminate the origin of metallic sulfides: abiotic (no living organisms involved in the corrosion mechanism) or biotic (living organisms involved in the corrosion reaction). Sulfate-Reducing Bacteria, SRB, are the bacteria leading to the biological formation of metallic sulfides, and thus involved in the biocorrosion mechanism. The approach taken is based on the fact that SRB produce reduced sulfur with a different sulfur isotopic ratio (34S/32S) than the natural isotopic distribution. In this work, standard metallic sulfides were prepared and analysed using XPS in order to obtain the surface composition, and thus using ToF-SIMS for having the isotopic composition of metallic sulfides. Finally, in this study, an analytical method using ToF-SIMS and a peak-fitting method using CasaXPS have been developed and validated. Moreover, different parameters which could influence the isotopic ratio value have been studied.
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Anne-Ilham El Menjra. Développement d’une méthodologie analytique par spectrométrie ToF-SIMS afin d’identifier l’origine, abiotique ou biotique, de produits de corrosion. Autre. Université Paris sciences et lettres, 2019. Français. ⟨NNT : 2019PSLEC024⟩. ⟨tel-02880018⟩

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