| 摘要 |
PROBLEM TO BE SOLVED: To provide an aluminum alloy clad fin material capable of preventing the occurrence of fin buckling due to insufficient flow of brazing filler metal and attack by molten brazing filler metal even in the case where the thickness of a clad fin material is reduced to <0.1mm, capable of low temp. brazing, excellent in strength and sacrificial anode effect after brazing, and suitable, in particular, for heat exchanger fin material for automobile use. SOLUTION: The aluminum alloy clad fin material is constituted by cladding both sides of a core material with brazing filler metal. At this time, the brazing filler metal has a composition which consists of, by weight, 5-15% Si, 1.0-8.0% Zn, 0.5-<5.0% Cu, and the balance Al with inevitable impurities and in which Zn%/Cu% is regulated to 0.5-3.0. The core material is composed of an aluminum alloy containing 0.01-1.6% Si. The thickness (t) of the clad fin material is 0.04-<0.1mm, and the relation between this thickness (t) and the average Si concentration TSi in the clad material satisfies 7.3×TSi -0.7×t<-1> -1.0>0. Further, the cladding ratio of the brazing filler metal is 3-30% on the average per side.
|
