Peroxide acceleration with phosphate neutralization

Details Peroxide acceleration with phosphate neutralization Peroxide acceleration with phosphate neutralization

C - Chemistry, Metallurgy

23

C

148/17

C23C 22/16 (2006.01)

Patent

CA 1048389

NEUTRALIZATION OF PEROXIDE CATALYZED ZINC PHOSPHATE SOLUTIONS ABSTRACT OF THE DISCLOSURE Disclosed is a process fox replenishing a peroxide catalyzed zinc phosphate conversion coating solution wherein the ratio of free to total P2O5 is maintained by the addition of a neutralizing ammonium or alkali metal phosphate solution of pH 6.5 - 10. Preferably, the peroxide is also included in the neutralizing solution. Advantages include ease of maintaining the. desired free to total P2O5 ratio, improved stability of the peroxide, and increased zinc ion solubility compared to alternative neutralization techniques.

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