Phosphate coating process and control of the phosphate coating s

Details Phosphate coating process and control of the phosphate coating s Phosphate coating process and control of the phosphate coating s

1975-08-21

1976-12-07

Talbert, Jr., Dennis E.

Metal treatment

Compositions

Heat treating

148 615Z, 148 616, 427345, 210 30R, 210 34, 210 37R, C23F 708

Patent

active

039960722

ABSTRACT:
A phosphate coating solution for forming coatings on a metal surface is contacted with an anion-exchanger loaded or contacted with nitrite ions, whereby the nitrate ions present in the coating solution are replaced by the nitrite ions. This process permits continued operation of a phosphate coating process without replenishing a nitrite solution. This process also allows no accumulation of alkali metal and/or ammonium ions unavailable for the phosphate coating and provides uniform coatings with satisfactory coating properties on the metal surface.

REFERENCES:
patent: 2909455 (1959-10-01), Newhard Jr. et al.
patent: 2967791 (1961-01-01), Halversen
patent: 3015594 (1962-01-01), Russell
patent: 3455816 (1969-07-01), Swanson
patent: 3516875 (1970-06-01), Rausch et al.

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