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Approche expérimentale et théorique de l’inhibition de corrosion de surfaces métalliques

Abstract : Corrosion of aluminum and aluminum/copper alloy surfaces, including localized corrosion, is a major problem in the industry, and the use of a corrosion inhibitor is often essential. Chromates perfectly fulfill their role of inhibition but will soon be prohibited because of their toxicities for humans and environment. Understanding the mechanisms of corrosion and corrosion inhibition is therefore a real challenge for research today. This thesis work is organized around three lines of research: the understanding of the aluminum corrosion initiation mechanisms, the relationship between the chemical composition of the alloy and the corrosion resistance of aluminum/copper alloys, and finally the study of linear carboxylic acids as green corrosion inhibitors. This project relies on two complementary approaches: a theoretical approach, based on DFT calculations, and an experimental approach combining surface analysis techniques as well as electrochemical techniques. First, the reactivity with respect to O2 of alumina thin film models on metallic aluminum, was studied by ab initio calculations in the presence of oxygen vacancies in the oxide, or copper in the metal, as well as in the presence of a carboxylic acids monolayer on the surface. Surface analysis techniques (XPS, ToF-SIMS, AFM and SEM) were then used to analyze the chemical composition and morphology of pure aluminum surfaces and Al/Cu model alloys before and after adsorption. a carboxylic acids monolayer. The influence of the presence of this surface layer on the corrosion in chloride medium is finally studied by electrochemical measurements.
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Submitted on : Monday, April 6, 2020 - 6:03:20 PM
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Pauline Cornette. Approche expérimentale et théorique de l’inhibition de corrosion de surfaces métalliques. Autre. PSL Research University, 2018. Français. ⟨NNT : 2018PSLEC004⟩. ⟨tel-02534080⟩

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