| 摘要 |
PROBLEM TO BE SOLVED: To provide an aluminum alloy heat exchanger which has high strength at high temperature and is excellent in corrosion resistance in a strongly acidic environment.SOLUTION: In a heat exchanger, a second aluminum alloy material is connected to the inside of a first aluminum alloy material by brazing. The first aluminum alloy material includes: a core material containing 1.0-1.8% Mn, 0.3-1.2% Si, 0.1-1.0% Cu, and the balance being Al and inevitable impurities; a brazing filler metal disposed on the side connected to the second aluminum alloy material of the core material and containing 5.0-9.5% Si, 1.0-5.0% Zn, and the balance being Al and inevitable impurities; and a brazing filler metal disposed opposite to the side connected to the first aluminum alloy material of the core material and comprising an Al-Si based alloy. The second aluminum alloy material has a composition containing 1.0-1.8% Mn, 0.3-1.2% Si, and the balance being Al and inevitable impurities. |
