Phosphating of metallic substrate with electrolytic reduction of

Details Phosphating of metallic substrate with electrolytic reduction of Phosphating of metallic substrate with electrolytic reduction of

1977-04-27

1978-09-12

Kendall, Ralph S.

Metal treatment

Compositions

Heat treating

148 615Z, 204DIG13, 427345, C23F 710

Patent

active

041135199

ABSTRACT:
In a method for phosphating the surface of a metallic substrate by treament with a phosphating solution comprising nitrite ions as the accelerator, an improvement wherein the supply of the nitrite ions to the phosphating solution is carried out by electrolytic reduction of nitrate ions present in the phosphating solution, whereby a desired concentration of nitrite ions in the phosphating solution is maintained without accumulation of alkali metal and/or ammonium ions unavailable for the phosphating and a uniform phosphate coating film having satisfactorily good coating properties is formed on said surface.

REFERENCES:
patent: 3510412 (1970-05-01), Raviv et al.
patent: 3616304 (1971-10-01), Bedi
patent: 3640805 (1972-02-01), Knight et al.
patent: 3996072 (1976-12-01), Oka et al.

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