Process for phosphate conversion coating with treatment of rinse

Details Process for phosphate conversion coating with treatment of rinse Process for phosphate conversion coating with treatment of rinse

1977-04-19

1978-12-19

Kendall, Ralph S.

Metal treatment

Compositions

Heat treating

148 615R, 427345, C23F 710

Patent

active

041304462

ABSTRACT:
A process for phosphate conversion coating iron and steel which includes a multi-step water rinsing stage after the conversion coating stage, which comprises subjecting a part of the rinsing water used therein to a reverse osmosis treatment, returning the concentrated liquid thereof to the conversion coating stage, and using the filtrate as replenishing water for the conversion coating and/or the degreasing and water rinsing stages after subjecting it to an ion exchange treatment.

REFERENCES:
patent: 3996072 (1976-12-01), Oka et al.
Donelly et al., Plating, May 1974, pp. 432-442.
Merser et al., Chem. Abs. 80:872196, 1974.

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