Zinc phosphate conversion coating and process
AssigneeHenkel Corporation
InventorsMichael L. Sienkowski, Gerald J. Cormier
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Abstract
Zinc phosphate coatings for metal surfaces and phosphating process. Concentrates containing (a) hydroxylamine sulfate and (b) zinc, nickel, manganese and phosphate ions are formulated into aqueous coating solutions for treating metal surfaces, including ferrous, zinc and aluminum surfaces.
Claims2
A concentrate composition for use in formulating an aqueous coating solution for the treatment of metal surfaces, said concentrate composition being selected from the group consisting of
- ______________________________________ Parts by Weight ______________________________________ (A) Water about 368.5 H.sub.3 PO.sub.4 (75%) about 390.00 HNO.sub.3 (42.degree.Be) about 5.0 Hydroxylamine Sulfate about 35.0 MnO about 13.5 ZnO about 26.0 Ni(NO.sub.3).sub.2 (30% solution) about 75.0 H.sub.2 SiF.sub.6 (25%) about 80.0 HF (70%) about 7.0 and (B) Water about 315.5 H.sub.3 PO.sub.4 (75%) about 390.0 HNO.sub.3 (42.degree.Be) about 5.0 Hydroxylamine Sulfate about 35.0 MnO about 21.5 ZnO about 26.0 Ni(NO.sub.3).sub.2 (30% Solution) about 120.0 HF (70%) about 7.0 H.sub.2 SiF.sub.6 (25%) about 80.0. ______________________________________
An aqueous phosphate coating solution for producing crystalline coatings on a metal substrate comprising the composition by weight of
- ______________________________________ % ______________________________________ hydroxylamine sulfate about 0.168 zinc ion about 0.10 nickel ion about 0.05 manganese ion about 0.05 phosphate ion about 1.37 nitrate ion about 0.12 free fluoride about 0.022 complex fluoride about 0.074. ______________________________________
Dependencies are inferred from the claim text.