Method of surface treating aluminum alloy base body of heat...

Heat exchange – With coated – roughened or polished surface

Reexamination Certificate

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C165S134100, C029S890045, C148S257000

Reexamination Certificate

active

07353863

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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patent: 2001-158983 (2001-06-01), None

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