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Synthèse de revêtements anticorrosion par voie sol-gel pour la protection de l’alliage 2024 T3. Caractérisation par spectroscopie d’impédance électrochimique et ellipsométrie in situ.

Abstract : Aluminum alloy 2024 T3 is widely used in the aeronauticalfield due toits high weight-to-strength ratio. However, such material is particularly sensitive to corrosion because of its heterogeneous structure. To protect these alloys,the current strategy is to use a three layer stack doped with crv1 based corrosion inhibitors. Nevertheless,those substances are highly toxic. Therefore,their replacement has become a critical issue for the aircraft industry. ln this context,synthesis and characterization of new protective coatings are particularly important. The objective of this work is thus to study materials evolution and corrosion phenomena using in situ ellipsometry and electrochemical impedance spectroscopy. Coupling those tow techniques provides new insights to understand the relationship between coating synthesis,microstructure,durability and anticorrosion properties. On one hand,a study has been done on hybrid hydrophobie layers to enhance barrier properties. On the other hand,mesostructured layers, potential matrix for anticorrosion inhibitors have been studied. The final goal is to couple those two materials in a multi-layer system in order to optimize anticorrosion properties
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https://tel.archives-ouvertes.fr/tel-03053400
Contributor : Véronique Martin <>
Submitted on : Friday, December 11, 2020 - 8:36:33 AM
Last modification on : Thursday, December 17, 2020 - 1:40:09 PM
Long-term archiving on: : Friday, March 12, 2021 - 6:33:37 PM

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  • HAL Id : tel-03053400, version 1

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Elise Medina. Synthèse de revêtements anticorrosion par voie sol-gel pour la protection de l’alliage 2024 T3. Caractérisation par spectroscopie d’impédance électrochimique et ellipsométrie in situ.. Chimie. Sorbonne Universite, 2019. Français. ⟨tel-03053400⟩

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