Phosphate coating process

Details Phosphate coating process Phosphate coating process

1978-11-20

1980-11-11

Kendall, Ralph S.

Metal treatment

Compositions

Heat treating

C23F 710, C23F 712

Patent

active

042330874

ABSTRACT:
A continuous process for coating ferrous or zinciferous metal substrates using an acidic coating solution of zinc phosphate in the presence of hydrogen peroxide wherein (a) the molar ratio ortho phosphate/zinc in solution is maintained in the range 0.5-3.7, and (b) the coating solution is replenished with hydrogen peroxide, replenishment feed (i) (comprising zinc, ortho phosphate and anion N.sup.n-), and replenishment feed (ii) (comprising alkali), the ratio of the quantities of (i) and (ii) being defined. The acid H.sub.n N has a pK.sub.a value not greater than 3.

REFERENCES:
patent: 3607453 (1971-09-01), Engesser et al.
patent: 4071379 (1978-01-01), Cooke et al.
patent: 4089710 (1978-05-01), Cooke

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