Surface treatment method for plate material, and radiating fin for heat exchanger
AssigneeDaikin Industries, Ltd.
InventorsHiraku Kawasaki, Shinichirou Kobayashi
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Abstract
The present invention reduces the expense of treating the surfaces of a plate material. This surface treatment method treats the surfaces of a plate material that is rolled with rolling oil and employed as a cooling fin of a heat exchanger, and includes a preparation step and a coating application step. In the preparation step, the plate material is prepared. In the coating application step, a coating is applied to the surface of the plate material without carrying out a degreasing treatment.
Claims13
A fin composed of a plate material having a non-degreased, non-surface roughened surface at least partially coated with a rolling oil and having a plate shape, comprising:
- a fin unit having the non-degreased, non-surface roughened surface at least partially coated with the rolling oil;
- and
- a coating film that is formed on the non-degreased, non-surface roughened surface of the fin unit that is at least partially coated with the rolling oil, the coating film including a corrosion resistant coating applied to the non-degreased, non-surface roughened surface of the fin unit that is at least partially coated with the rolling oil and a hydrophilic coating applied to the corrosion resistant coating;
- wherein in response to infrared spectrum measurement the coating film exhibits a peak in the infrared spectrum corresponding to the primary constituent of the rolling oil, and concave and convex portions on the surfaces of the coating film are in a range between 2 and 5 micrometers in the plate thickness direction.
Dependencies are inferred from the claim text.