| 摘要 |
PROBLEM TO BE SOLVED: To obtain a fin for heat exchanger, which is excellent in the hydrophilic property of the surface thereof which lasts for a long period of time. SOLUTION: A fin for a heat exchanger is provided with a surface, having a fine irregularity structure whose all or a part of metallic surface is coated with a hydrophilic substance, and the height of the irregularity structure is lower than 300μm and the actual surface area per 1cm<2> of the same structure in a plan view is winder than 2cm<2> while the surface is provided with a surface- treated metal, having a contacting area of 0.3cm<2> or less per 1cm<2> of rigid body surface when a flat rigid body is contacted with the surface of the irregularity structure. According to this method, the fin is excellent in the hydrophilic property of the surface thereof and the flow down of condensed water can be promoted.
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