C - Chemistry – Metallurgy – 23 – C
Patent
C - Chemistry, Metallurgy
23
C
C23C 22/56 (2006.01) C21D 1/60 (2006.01) C22F 1/04 (2006.01) C22F 1/047 (2006.01) C22F 1/05 (2006.01) C23C 22/73 (2006.01)
Patent
CA 2488040
The invention relates to a method for surface treatment of sheets and strips of aluminium alloy to form a chemically altered layer. The sheet or strip is the product from a manufacturing process comprising a thermal treatment step followed by cooling in a liquid in which the chemical conversion is carried out using the cooling liquid. The cooling liquid preferably contains between 1 and 10 % by weight of at least one salt of one at least of the following metals Si, Ti, Zr, Ce, Mn, Mo or V. The invention particularly finds application to sheets and strips which need a controlled oxide surface for the production of chassis components for the automobile industry for spot gluing or welding.
L'invention a pour objet un procédé de traitement de surface d'une tôle ou bande en alliage d'aluminium pour former une couche de conversion chimique, la tôle ou la bande étant issue d'une gamme de fabrication comportant un traitement thermique suivi d'un refroidissement dans un liquide, dans lequel la conversion chimique est effectuée à l'aide du liquide de refroidissement. De préférence, le liquide de refroidissement contient entre 1 et 10% en poids d'au moins un sel de l'un au moins des métaux Si, Ti, Zr, Ce, Mn, Mo ou V. L'invention s'applique en particulier aux tôles et bandes nécessitant une surface à oxyde contrôlé pour la fabrication de pièces de carrosserie d'automobiles collées ou soudées par points.
Benmalek Mohammed
Gavoille Pierre
Golfouse Antoine
Hank Evelyne
Shahani Ravi
Norton Rose Or S.e.n.c.r.l. S.r.l./llp
Pechiney Rhenalu
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