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Influence de la nanostructuration sur le comportement à la corrosion de revêtements multicouches élaborés par PVD

Abstract : This work is part of an ANR project which purpose is to find an alternative to sacrificial electrolytic coatingsusing aluminium-based PVD coatings, which are more environmental friendly. Three main parameters weredefined : a sacrificial behavior, good tribological properties and the possibility to elaborate the coatings before shaping the steel substrate. Monolayer coatings were elaborated to study the impact of an alloying element on aluminium properties. Some alloying elements increase mechanical properties (Mo, Mn) while others enhance the electrochemical behavior (Mg, Zn). To combine both properties, two methods can be used. Either the elaboration ofternary alloys or the elaboration of multilayer coatings. This work is focused on the second way. Some multilayercoatings were proposed with two types of layers, each type presenting one interesting property. This study permitted to find a multilayer architecture fitting very well two parameters required for the project.A preliminary study on this architecture was lead with electrochemical characterization after strain. The architecture loses its sacrificial behavior after 1% strain in 48h immersion. Two of the three requested criteria are found.The next step of this work would be the optimization of the process parameters to enhance the adhesion of the coating so the third parameter is achieved.
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Andréa Perez. Influence de la nanostructuration sur le comportement à la corrosion de revêtements multicouches élaborés par PVD. Autre. Université de La Rochelle, 2011. Français. ⟨NNT : 2011LAROS334⟩. ⟨tel-00697016⟩

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