C - Chemistry – Metallurgy – 23 – C
Patent
C - Chemistry, Metallurgy
23
C
C23C 22/34 (2006.01) B23K 1/20 (2006.01) B23K 35/36 (2006.01)
Patent
CA 2575175
The invention relates to a method of assembling aluminium alloy products, such as sheets, strips or tubes, by means of fluxless brazing, whereby the absence of flux is made possible owing to an earlier treatment comprising the formation of a conversion layer on the surface of said products using a solution containing K+ and F- ions and one or more acids in a quantity such that the pH of the solution is less than 3. The inventive method enables effective fluxless brazing in industrial conditions, such as for the heat exchangers used in a motor vehicle.
L'invention a pour objet un procédé d'assemblage par brasage sans flux de produits en alliage(s) d'aluminium tels que des tôles, bandes ou tubes, l'absence de flux étant permise par un traitement préalable de formation d'une couche de conversion en surface desdits produits à l'aide d'une solution contenant des ions K+ et F- et un ou plusieurs acide(s) en quantité telle que le pH de la solution soit inférieur à 3. Le procédé selon l'invention permet un brasage sans flux efficace dans des conditions industrielles, notamment pour les échangeurs de chaleur utilisés dans l'automobile.
Dulac Sandrine
Henry Sylvain
Mediouni Michel
Safrany Sylvestre
Alcan Rhenalu
Norton Rose Or S.e.n.c.r.l. S.r.l./llp
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