Heat exchanger aluminum alloy composite material having excellent fatigue strength and corrosion resistance

摘要

PURPOSE: To produce a thin aluminum alloy composite material excellent in fatigue strength and corrosion resistance. ;CONSTITUTION: This aluminum alloy composite material is the one in which, in an aluminum alloy composite material for a heat exchanger with a three- layered structure in which one side of a core material 7 is clad with a brazing filler metal 9 and the other side is clad with a sacrificial material 8, the core material 7 is constituted of an aluminum alloy contg., by weight, 0.05 to 0.5% Si, 0.1 to 1.5% Cu, 0.5 to 2.0% Mn, and the balance Al with inevitable impurities and the sacrificial material 8 is constituted of an aluminum alloy contg. 0.02 to 0.15% Si, 0.1 to 0.4% Fe, 1.0 to 3.0% Mg, 3.0 to 6.0% Zn, and the balance Al with inevitable impurities, and furthermore, the hardness of the sacrificial material 8 after brazing heating is regulated to the hardness of the core material 7 or above. Since the sacrificial material 8 is compositionally excellent in corrosion resistance and the hardness of the sacrificial material 8 is regulated to the hardness of the core material 7 or above, cracks are hard to generate on the surface under vibration, and it is excellent in fatigue strength even in the case of being thin.;COPYRIGHT: (C)1996,JPO