Chromate/silicate aluminum surface treatment for heat exchangers

Details Chromate/silicate aluminum surface treatment for heat exchangers Chromate/silicate aluminum surface treatment for heat exchangers

1992-12-30

1993-08-10

Pianalto, Bernard

Coating processes

With pretreatment of the base

Metal base

427436, B05D 300

Patent

active

052347141

ABSTRACT:
A chromate/silicate surface treatment for providing an aluminum heat exchanger with a corrosive-resistent hydrophilic coating. The subject process includes sequentially immersing an aluminum heat exchanger in a series of chemical solutions. The chemical solutions include a cleaning solution, followed by a rinse solution, chromate solution, additional rinse solution, and a silicate solution. The chemical concentrations of the cleaning solution, chromate solution and silicate solution are precisely controlled in order to avoid producing a coating which emits a musty odor.

REFERENCES:
patent: 3762178 (1973-10-01), Yamada et al.
patent: 4672816 (1987-06-01), Takahashi

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