To provide a method for producing a fin material made of aluminum in which a non-chromium type conversion treatment agent harmless for the environment is used, and by which required performances of corrosion resistance and moisture resistance are satisfied and to provide a hydrophilized fin material made of aluminum.
In the process where an aluminum base material for a fin material is subjected to conversion treatment, a chemical conversion coating is deposited while maintaining a conversion treatment solution to the following compositional ranges under the conditions of the solution temperature of 30 to 70°C and the treatment time of 1 to 10 sec. The surface of the chemical conversion coating is deposited with a corrosion resistant coating and/or a hydrophilized coating composed of water based resin: zirconium ions of 10 to 10,000 ppm, phosphoric ions of 10 to 10,000 ppm, aluminum ions of 100 to 10,000 ppm, effective fluorine ions of 1 to 500 ppm, organic acid having one or more phenolic hydroxyl groups in the molecule of 10 to 10,000 ppm, and pH of 1.0 to 4.0.
SHIMIZU TAKAHIRO
INBE TOSHIO
HIRASAWA HIDEKIMI
NIPPON PAINT CO LTD
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