| 摘要 |
A heat exchanger ( 1 ) which comprises a plurality of flat hollow bodies ( 2 ) arranged in parallel, and an aluminum fin ( 3 ) disposed between each pair of adjacent flat hollow bodies ( 2 ) and brazed thereto. The flat hollow body ( 2 ) is made from two plates ( 6 ) of an aluminum clad material comprising an aluminum core and a cladding of Al-Si brazing material covering at least one outer surface of the core, by brazing peripheral edges of the two plates to each other. The core of the clad material is made of an alloy containing 0.4 to 1.5 mass % of Cu and the balance Al and inevitable impurities. A line graph representing variations in potential relative to the depth of a surface layer portion of an outer surface of the flat hollow body ( 2 ) from the outermost surface thereof to a depth of 100 mum has a potential gradient of at least 0.25 mV at points on the line of the graph. The heat exchanger can be fabricated easily at a low cost and has satisfactory resistance to pitting corrosion.
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