Aluminum based phosphate final rinse

Details Aluminum based phosphate final rinse Aluminum based phosphate final rinse

1991-02-28

1992-07-07

Robinson, Ellis P.

Stock material or miscellaneous articles

Composite

Of metal

428472, 4284721, 4281722, 428696, 428697, 428702, 148256, 148259, C23C 2283, C23C 900

Patent

active

051282119

ABSTRACT:
A final rinse for a phosphatized metal surface includes a phosphoric acid solution including aluminum chlorohydrate. The aluminum chlorohydrate solution is applied at a concentration of about 100 to about 1500 ppm at a pH of 3 to about 4.5. The pH is obtained by controlling the concentration of the phosphoric acid. This is preferably used to coat previously phosphatized metal surfaces such as iron, steel, aluminum and galvanize.

REFERENCES:
patent: 3857723 (1974-12-01), Haskell et al.
patent: 3877998 (1975-04-01), Guhde
patent: 4039353 (1977-08-01), Kulick et al.
patent: 4097287 (1978-06-01), Ito et al.
patent: 4182637 (1980-01-01), Otrhalek et al.
patent: 4298404 (1981-11-01), Greene
patent: 4376000 (1983-03-01), Lindert
patent: 4497666 (1985-02-01), Schapira et al.
patent: 4650526 (1987-03-01), Claffey
Ron Zurilla et al: Phosphate Final rinse Options, Pretreat '90, pp. 4-1 thru 4-18.

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