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Etude du comportement électrochimique des phases intermétalliques des alliages d'aluminium 2214-T6 et 7050-T74: approche multi-échelle de matériaux polyphasés

Abstract : The electrochemical behaviour of the bulk intermetallic particles such as Al2Cu, Al2CuMg, Al7Cu2Fe, (Al,Cu)16(Mn,Fe)4Si3 and MgZn2 showed that the formation of wide defects in the oxide layer during the 2214-T6 and 7050-T74 alloys anodization was directly due to the presence of these kind of particles in the microstructure which are able to sustain both high dissolution rate and high water oxidation kinetics in acidic electrolyte. In marine environment, these defects facilitate the migration of aggressive ions like chloride on the locally bare alloys and are the onset of the pitting corrosion. The results obtained in 3.5 wt.% sodium chloride electrolyte permit to understand the corrosion mechanism of the intermetallic phases and their influence on the pits propagation. The optimization of the alloys pickling conditions in order to remove this kind of particles (prior to the anodization step) has been investigated in this work. Consequence of removing intermetallic particles, the aluminium enrichment of the surface facilitates the oxide growth and the formation of regular layer. The corrosion tests on treated aluminium alloys have clearly showed the influence of the pickling step on the resistance corrosion of 2214 and 7050 alloys, reaching the objectives fixed in this project
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  • HAL Id : tel-01749241, version 1

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Joffrey Tardelli. Etude du comportement électrochimique des phases intermétalliques des alliages d'aluminium 2214-T6 et 7050-T74: approche multi-échelle de matériaux polyphasés. Autre. Université de Lorraine, 2012. Français. ⟨NNT : 2012LORR0082⟩. ⟨tel-01749241⟩

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