| 摘要 |
<p><P>PROBLEM TO BE SOLVED: To provide an aluminum heat exchanger having excellent corrosion resistance by improving corrosion resistance of a tube material, in the heat exchanger assembled by brazing and joining an aluminum fin material to an outside surface of the aluminum tube material formed by bending a plate material. <P>SOLUTION: The aluminum heat exchanger is constituted so that the tube material is molded from a core material and a two-layer clad plate formed by cladding an Al-Zn alloy layer on the core material, and the Al-Zn alloy layer is clad on the outside surface side of the tube material, and is brazed and joined to the aluminum fin material. Electric potential in general corrosive water of the Al-Zn alloy layer is set lower by 100 mV than electric potential in general corrosive water of the core material, and the electric potential in the general corrosive water of the Al-Zn alloy layer is set lower than electric potential in high concentration corrosive water of the core material. Here, the general corrosive water means an aqueous solution including NaCl of 10 g/l and Na<SB>2</SB>SO<SB>4</SB>of 0.3 g/l, and the high concentration corrosive water means an aqueous solution by setting the NaCl concentration to 30 times, by concentrating the aqueous solution. This aluminum heat exchanger can be suitably used as a heat exchanger for an automobile such as particularly, a condenser and an evaporator. <P>COPYRIGHT: (C)2005,JPO&NCIPI</p> |
