| 摘要 |
PROBLEM TO BE SOLVED: To provide an aluminum heat exchanger, in which a positive effect of a sacrificial corrosion can be obtained in a brazing filler-metal. SOLUTION: The aluminum heat exchanger is provided with tanks 43, 44, 47, and 48 and tubes 2 (c) for constituting a heat-exchange part 3. In the heat exchanger, Al-Si brazing filler metals 4a, 4c are clad on one or both sides of a parent metal 4b of the tubes and tanks, and Zn is added as a sacrificial corrosion component to one or both surfaces of the brazing filler metals 4a, 4c, so that natural potentials of both primary crystalα-phase and eutectic in the texture of the brazing filler metal 4a become baser than that of the parent metal 4b. Specifically the metal 4b is of Al-Mn system, an addition amount of Zn to the brazing filler metal 4a is specified to be 2.5-10 mass %.
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