Aluminium alloy strips for heat exchangers

C - Chemistry – Metallurgy – 22 – C

Patent

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Details

C22C 21/00 (2006.01) B22D 11/00 (2006.01) B22D 11/06 (2006.01) C22C 21/10 (2006.01) C22F 1/04 (2006.01) C22F 1/053 (2006.01) F28F 21/08 (2006.01)

Patent

CA 2467681

The invention concerns aluminium alloy strips less than 0.3 mm thick for making heat exchangers, consisting of (wt. %): Si<1.0, Fe<1.0, Cu<0.8, Mg<1.0, Mn<1.8, Zn<2.0, In<0.2, Sn<0.2, Bi<0.2, Ti<0.2, Cr<0.25, Zr<0.25, Si+Fe+Mn+Mg>0.8, other elements <0.05, each and <0.15 in total, having between the surface and half the thickness a difference of corrosion potential, measured relative to a saturated calomel electrode in accordance with the ASTM G69 standard, of at least 10 mV. The invention also concerns a method for making such strips by continuous casting in conditions promoting formation of segregations in the strip core, optionally hot rolling, cold rolling optionally with one or several intermediate or final annealing(s) of 1 to 20 hours at a temperature between 200 and 450 ·C. The fins or separators made from the inventive strips have enhanced resistance to perforating corrosion.

L'invention a pour objet des bandes en alliage d'aluminium d'épaisseur < 0,3 mm, destinées à la fabrication d'échangeurs thermiques, de composition (% en poids): Si<1,0 Fe<1,0 Cu<0,8 Mg<1,0 Mn<1,8 Zn<2,0 In<0.2 Sn<0.2 Bi<0.2 Ti<0.2 Cr<0.25 Zr<0.25 Si+Fe+Mn+Mg>0,8 autres éléments <0,05 chacun et <0,15 au total, présentant entre la surface et la mi-épaisseur une différence de potentiel de corrosion, mesurée par rapport à une électrode au calomel saturé selon la norme ASTM G69, d'au moins 10 mV. L'invention concerne également un procédé de fabrication de telles bandes par coulée continue dans des conditions favorisant la formation de ségrégations au coeur de la bande, éventuellement laminage à chaud, laminage à froid avec éventuellement un ou plusieurs recuit(s) intermédiaire(s) ou final de 1 à 20 h à une température comprise entre 200 et 450~C. Les ailettes ou intercalaires fabriqués à partir de bandes selon l'invention présentent une résistance améliorée à la corrosion perforante.

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