C - Chemistry – Metallurgy – 23 – C
Patent
C - Chemistry, Metallurgy
23
C
C23C 22/78 (2006.01) C23C 22/05 (2006.01)
Patent
CA 2528702
The invention relates to a method for processing the surface of a strip, sheet or a shaped part made of an aluminium alloy which involves the preparation of a surface with the aid of an atmospheric pressure plasma and a by chemical conversion treatment using at least the following elements Si, Ti, Zr, Ce, Co, Mn, Mo or V for producing a conversion coating on said strip, sheet or part. The inventive processing is more rapid and less costly than previous conversion treatments and is applied, in particular for strips and sheets which are used for a car body and assembled by welding or gluing.
L'invention a pour objet un procédé de traitement de surface d'une bande, d'une tôle ou d'une pièce formée en alliage d'aluminium, comportant une préparation de surface à l'aide d'un plasma atmosphérique, et un traitement de conversion chimique utilisant l'un au moins des éléments Si, Ti, Zr, Ce, Co, Mn, Mo ou V, pour former une couche de conversion sur la bande, la tôle ou la pièce. Le traitement selon l'invention est plus rapide et plus économique que les traitements de conversion de l'art antérieur, et s'applique notamment aux bandes et tôles utilisées pour la carrosserie automobile et destinées à être assemblées par collage ou soudage.
Benmalek Mohamed
Hank Evelyne
Shahani Ravi
Norton Rose Or S.e.n.c.r.l. S.r.l./llp
Pechiney Rhenalu
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