| 摘要 |
<p><P>PROBLEM TO BE SOLVED: To provide a heat exchanger keeping the strength of a fin at one face side even after corrosion, and having superior strength. <P>SOLUTION: In this heat exchanger having a core portion 3 in which aluminum flat tubes 10 and aluminum fins 20 are disposed alternatively and brazed with each other, one end side 20a in the width direction, of the fin 20 is higher in pitting potential than the other end side 20b, and the pitting potential difference therebetween is 40 to 200 mV. The pitting potential difference is formed, for example, by Zn concentration difference in an aluminum alloy constituting the fin 20. <P>COPYRIGHT: (C)2006,JPO&NCIPI</p> |
