| abstract |
An object of the present invention is to provide a fin material thinned to a final plate thickness of 30 to 80 μm, which is excellent in formability at the time of corrugating, has an appropriate strength before brazing for easy fin forming, and has an appropriate self-forming property. Provided is an aluminum alloy fin material for a heat exchanger which exhibits corrosion resistance and a sacrificial anode effect, and has high strength and excellent buckling resistance as a material constituting a working fluid passage. SOLUTION: In mass%, Si: 1.3% to 1.6%, Fe: 0.30% to 0.70%, Mn: 1.8% to 2.3%, Zn: 0.5% -2.0%, Ti: 0.002% -0.10%, Mg as an impurity is limited to 0.05% or less, and Cu is limited to 0.06% or less. The final plate thickness is 30 to 80 μm, the tensile strength is 260 MPa or less, the solidus temperature is 615 ° C. or more, and the tensile strength when measured after further brazing and cooling is 170 MPa or more and the natural potential is −780 mV or more. An aluminum fin material for a heat exchanger having excellent buckling resistance, which is 700 mV. [Selection diagram] FIG. |