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Compréhension des mécanismes d'inhibition de la corrosion dans le cadre de revêtements hybrides pour pièces aéronautiques

Abstract : The struggle against corrosion in the aeronautical industry is an ongoing challenge. To meet these requirements, the current system uses chromates with anticorrosive properties. However, these compounds are classified as carcinogenic, mutagenic, reprotoxic. A non-toxic sol-gel/polymer hybrid coating has been developed to provide an alternative to the reference system. This coating is innovative in its application by spray and a one-step UV-curing polymerization. This system is complex and the understanding of the mechanisms involved in corrosion inhibition has been the subject of this thesis work. First, work conducted has allowed to highlight the passive protection of the coating and link its performance to the film structuration down to the nanoscale. Then, in case of damage to the coating, the active protection of the coating was studied. During solicitation of the coating, the active response of the corrosion inhibitor system was characterized by exposure to natural environment, supplemented by accelerated cyclic corrosion tests. This research work has shown that the action of a corrosion inhibitor is closely dependent on the matrix in which it is integrated. The coating matrix is closed and dense, providing a barrier effect, but reducing the mobility of active species when the substrate to be protected is exposed. These tests have shown that the hybrid coating provides superior protection in comparison with a non-chromatedcommercial paint.
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Anaïs Even. Compréhension des mécanismes d'inhibition de la corrosion dans le cadre de revêtements hybrides pour pièces aéronautiques. Matériaux. Université de Bretagne Sud, 2019. Français. ⟨NNT : 2019LORIS534⟩. ⟨tel-02919122⟩

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