| 摘要 |
PROBLEM TO BE SOLVED: To provide an aluminum alloy clad material for heat exchanger, improved in corrosion resistance to a greater extent. SOLUTION: This aluminum alloy clad material for heat exchanger has a core material having a composition consisting of, by weight, 0.3-1.2% Si, 0.3-1.0%, Cu, 0.5-2.0% Mn, 0.05-0.5% Mg, and the balance Al with inevitable impurities. Further, one side of this core material is clad with a sacrificial anode material composed of an Al alloy which has a composition consisting of, by weight, >2.0-6.0% Zn, 0.2-2.0% Mn, and the balance Al with inevitable impurities and in which corrosion current value is regulated to <=40μA/cm<2> by incorporating an Al-Mn intermetallic compound of 0.1-0.8μm average grain size at >=2.0×10<9> pieces/mm<3> number density, and the other side is clad with a brazing filler metal of an Al-Si alloy containing prescribed amounts of Si.
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