Zinc phosphate coating process

Details Zinc phosphate coating process Zinc phosphate coating process

1975-08-25

1977-10-11

Kendall, Ralph S.

Metal treatment

Compositions

Heat treating

118326, 118314, 118602, C23F 708

Patent

active

040533280

ABSTRACT:
Zinc phosphate coating solution contains phosphate ions in an amount of at least 0.5 percent by weight and in the phosphate ion to nitrate ion molar weight ratio of from 1 : 0.7 to 1 : 1.3. This solution also contains zinc ions in an amount, preferably, of at least 0.03 percent by weight and in a ratio of zinc ion to phosphate ion of less than 0.116 to 1. Nickel ions may be added in an amount of at least 0.01 percent by weight and in the nickel ion to zinc ion ratio of less than 1.89 to 1. The pH value of this solution ranges from about pH 3.3 to pH 3.8, whereby the consumption of nitrites employed as accelerators is reduced and sludges are formed in less amounts as in the form easily removable from an apparatus where the phosphating is effected. The zinc phosphate coating solution is preferably employed for an apparatus in which little or no solution is discharged out of the phosphating system.

REFERENCES:
patent: 2743204 (1956-04-01), Russell
patent: 3294593 (1966-12-01), Wyszomirski
patent: 3597283 (1971-08-01), Snee
patent: 3619300 (1971-11-01), Heller et al.
patent: 3676224 (1972-07-01), Snee
patent: 3906895 (1975-09-01), Morino et al.

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