| 摘要 |
Provided is an aluminum alloy heat exchanger that exhibits excellent corrosion resistance at a brazed portion and that is suitable for use in an air-conditioner or a similar device. In the present invention, a header pipe comprises an aluminum alloy cladding material provided with an aluminum alloy core material and a sacrificial positive electrode material cladded onto one surface of the core material. The core material contains 0.3-2.0 mass%(hereafter abbreviated to %) of Mn, 1.5% or less of Si, 0.1-1.0% of Fe, and 0.05-1.0% of Cu, with the remainder made up by Al and unavoidable impurities. The sacrificial positive electrode material contains 0.05-1.0% of Fe and 0.5-5.0% of Zn, with the remainder made up by Al and unavoidable impurities. The potential of the joint section between the header pipe and the tube is lower than the potential of the header pipe surface and the potential at the tube surface by 30 mV or less. The potential of the joint section is lower than the potential at a position one quarter of the total depth from the surface of the header pipe and the potential at a position one quarter of the total depth from the tube surface by 30-100 mV. |
