Phosphate conversion coating and compositions and...

C - Chemistry – Metallurgy – 23 – C

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C23C 22/18 (2006.01) C23C 22/12 (2006.01) C23C 22/36 (2006.01)

Patent

CA 2177844

The following water soluble materials are all satisfactory internal accelerators for otherwise conventional zinc phosphate conversion coating solutions: reducing sugars, starch, urea, and poly(acrylates and methacrylates). Concentrates including these ingredients and otherwise conventional constituents of zinc phosphate conversion coating compositions, except for excluding conventional accelerators other than nitrate, are stable in composition during storage, unlike most conversion coating compositions, containing conventional accelerators. Thus concentrates according to the invention are practical single-package concentrates that can be made into working phosphating compositions by dilution with water only.

Les substances solubles dans l'eau suivantes constituent des accélérateurs internes satisfaisants pour des solutions de revêtement de conversion à phosphate de zinc conventionnelles à d'autres égards: les sucres réducteurs, l'amidon, l'urée, et les poly{acrylates et méthacrylates}. Les concentrés contenant ces ingrédients et d'autres éléments des compositions de revêtement de conversion à phosphate de zinc, conventionnels à tous les égards sauf en ce qu'ils ne contiennent pas d'accélérateurs conventionnels autres que le nitrate, présentent une composition stable au stockage à la différence de la plupart des compositions de revêtement de conversion contenant des accélérateurs conventionnels. Ainsi, les concentrés selon l'invention constituent des concentrés pratiques prêts à l'emploi pouvant être transformés en compositions de phosphatage seulement par dilution avec de l'eau.

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