| 摘要 |
PROBLEM TO BE SOLVED: To provide a corrosion resistant copper tube or a copper alloy tube and a heat exchanger employing the same, which are capable of coping with the change of an employing atmosphere from a high temperature to a low temperature, low in cost, prominent in re-cycling property and capable of maintaining the prominent corrosion resistant property for a long period of time. SOLUTION: The amorphous ceramics film is formed on the outer surface of the corrosion resistant copper tube. The thickness of the amorphous ceramics film is preferably 0.1-100μm, the hardness of the same is preferably 3 H-10 H in the pencil scratching value while the center line average surface roughness Ra of the outer surface of the tube is preferably 0.5μm or less, the maximum surface roughness Rmax is preferably 1.0μm or less, and the thickness of an oxidized film existing between the amorphous ceramics film and the outer surface of the copper tube is preferably 0.1μm or less.
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