Heat exchange – With coated – roughened or polished surface
Reexamination Certificate
2008-04-08
2008-04-08
Duong, Tho (Department: 3744)
Heat exchange
With coated, roughened or polished surface
C165S134100, C029S890045, C148S257000
Reexamination Certificate
active
10844610
ABSTRACT:
A method of surface treating an aluminum alloy base body of an heat exchanger which method enables an etching procedure to be carried out uniformly and quickly and a corrosion-resistant chemical conversion coating to be formed, is effected by pretreating the Al heat exchanger base body with an aqueous pre-treating liquid having a pH of 9.0 or less, etching the pretreated base body with an aqueous alkaline solution having a pH of 9.0 or more, and then subjecting the etched base body to a chemical conversion treatment or a hydrophilicity-enhancing treatment.
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Hamamura Kazunari
Karube Kenji
Kasebe Osamu
Kobayashi Kengo
Shimoda Kensuke
Denso Corporation
Duong Tho
Harness Dickey & Pierce PLC
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