Hydrophilic surface-treating process for an aluminum article

Details Hydrophilic surface-treating process for an aluminum article Hydrophilic surface-treating process for an aluminum article

1986-04-04

1987-03-17

Silverberg, Sam

Metal treatment

Compositions

Heat treating

148 62, C23C 2237, C23C 2238

Patent

active

046505270

ABSTRACT:
The invention involves a nonrinse type hydrophilic surface-treating process capable of imparting hydrophilicity to the surface of a metal material, e.g., aluminum, and, at the same time, forming thereon a coating excelling in resistance to corrosion. In the process there is applied an aqueous solution which contains selected amounts of Cr ions (III, VI), F.sup.-, SiO.sub.2 and a water-soluble acrylic acid polymer, and optionally PO.sub.4.sup.-3, if necessary. An aluminum article treated by this process is suitable for the fins of a heat exchanger.

REFERENCES:
patent: 3506499 (1970-04-01), Okada
patent: 4137368 (1979-01-01), Miller
patent: 4462842 (1984-07-01), Uchiyma

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