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Développement d’un primaire d’adhésion anticorrosion sans Cr VI pour l’alliage aéronautique Al2024-T3

Abstract : The use of hexavalent chromium for anticorrosion surface treatments in aeronautics field will soon be banned by the REACH reglementation. Looking for an innovative solution, PROTEC industry and the CEA research center work in collaboration with the aim of developing a chromium free replacement treatment, which can substitute current solution and give competitive results both in adhesion and corrosion protection. The thesis project presented in this manuscript is part of a common laboratory named MESTREL, including the two entities. The proposed solution is based on the grafting of a polymeric film inspired by the diazonium chemistry on an Al2024-T3 surface, reference alloy in the aeronautic field. The principal objective of the thesis is to determinate the best conditions of grafting, -giving similar properties to chromium treatment. To this end, spectroscopic and electrochemical characterizations have been performed. Electrochemical Microscopy protocols are developed to assess the passivation properties of the film The high porosity of the film has allowed to develop a new innovative bilayer process combining anticorrosive properties of current solution and adhesion properties of the functionnal coating. At the same time, an out-of-tank deposition technique is developed. The goal is to enable economic benefits and facilitate treatment of very large aeronautic pieces.
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Aurélien Doublet. Développement d’un primaire d’adhésion anticorrosion sans Cr VI pour l’alliage aéronautique Al2024-T3. Matériaux. Université Paris Saclay (COmUE), 2019. Français. ⟨NNT : 2019SACLS280⟩. ⟨tel-02950052⟩

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