Etude des procédés de colmatage d'alliages d'aluminium anodisé

Abstract : In order to replace nickel-based sealing process, the characterization of new treatments of sealing and their corrosion resistances on anodic aluminum alloys were carried out. The morphological study showed that the pores were not stopped after the stage of sealing. Only a surface layer is observed for certain treatments of sealing. The anodic oxide coating sealed or not is made up of alumina and aluminum oxyhydroxide with incorporation of ions sulphates. The content of these ions is less important in the oxide coating after sealing during this treatment one observes the diffusion in the layer of the "sealing" species which leads to the exit of the ions sulphates. The anticorrosion properties of the "sealing" compound adsorbed in the nanoporosities or fixed in a surface layer remains very dependent on alloys and the defects present in the layers at the microscopic scale after the anodization.
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Aurélie Pernot-Gehin. Etude des procédés de colmatage d'alliages d'aluminium anodisé. Autre. Université Henri Poincaré - Nancy 1, 2007. Français. ⟨NNT : 2007NAN10113⟩. ⟨tel-01748238⟩

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