Abstract: Aluminum alloy strips less than 0.3 mm thick for making heat exchangers, containing, in 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. The strips have 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.

Abstract: The invention relates to a process to manufacture a clad strip, preferably <1.5 mm thick, intended for the manufacture of brazed heat exchangers, comprising: casting a plate of core alloy comprising (% by weight): Si<0.8, Fe<0.8, Cu 0.2-0.9, Mn 0.7-1.5, Mg<0.4, Zn<0.2, Ti<0.1, other elements <0.05 each and <0.15 in total, the remainder aluminum, homogenizing the plate between 550 and 630° C. for at least one hour, cladding one or two sides of the plate with a brazing aluminum alloy, preferentially containing 5 to 13% silicon, hot rolling followed by cold rolling of the plate to a thickness close to a final desired thickness, recrystallization annealing of the strip between 300 and 4000 C., strain hardening of the annealed strip to obtain a permanent deformation between 2 and 10% and to obtain the desired final thickness.

Abstract: Aluminum alloy strips less than 0.3 mm thick for making heat exchangers, containing, in 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. The strips have 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.

Abstract: The invention relates to a process to manufacture a clad strip, <1.5 mm thick, intended for the manufacture of brazed heat exchangers, comprising: casting of a plate made of core alloy composed as follows (o by weight): Si<0.8 Fe<0.8 Cu: 0.2-0.9 Mn: 0.7-1.5 Mg<0.4 Zn<0.2 Ti<0.1 other elements <0.05 each and <0.15 in total, the remainder aluminum, homogenization of said plate between 550 and 630° C. for at least one hour, cladding on one or two sides of said blank of a brazing aluminum alloy, preferentially containing 5 to 13% silicon, hot rolling followed by cold rolling of the plated blank to a thickness close to the final thickness, recrystallization annealing of the strip between 300 and 4000C., strain hardening of the annealed strip to obtain a permanent deformation between 2 and 10% and the final thickness.

Abstract: The invention relates to a process to manufacture a clad strip, preferably <1.

Abstract: The invention relates to a process to manufacture a clad strip, <1.