Phosphating of metallic substrate

Details Phosphating of metallic substrate Phosphating of metallic substrate

1978-10-12

1979-12-25

Kendall, Ralph S.

Metal treatment

Compositions

Heat treating

148 615R, 204181R, 204DIG13, C23F 710

Patent

active

041804171

ABSTRACT:
In a method for phosphating the surface of a metallic substrate by treatment with a phosphating solution containing 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 while changing the direction of the current flow at a fixed interval of time, 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 also without accumulation of precipitates on the electrode, and a uniform phosphate coating film having satisfactorily good coating properties is formed on said surface.

REFERENCES:
patent: 3401065 (1968-09-01), Steinbrecher et al.
patent: 4113519 (1978-09-01), Oka et al.

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