Zinc phosphate tungsten-containing coating compositions...

Details Zinc phosphate tungsten-containing coating compositions... Zinc phosphate tungsten-containing coating compositions...

C - Chemistry, Metallurgy

23

C

C23C 22/42 (2006.01) C23C 22/44 (2006.01)

Patent

CA 2245556

Zinc phosphate aqueous coating compositions containing tungsten and using an accelerator which is an oxime, hydroxylamine sulfate or a mixture thereof are disclosed. The accelerators are environmentally friendly and stable in the acidic environment of zinc phosphate coating compositions so as to enable formation of a one-package system. The tungsten component avoids the use of nickel or cobalt ions in the compositions which are environmentally objectionable.

On décrit des compositions aqueuses d'enduction à base de phosphate de zinc contenant du tungstène et comprenant comme accélérateur une oxime, du sulphate d'hydroxylamine ou un mélange de ces deux composés. Ces accélérateurs sont sans danger pour l'environnment et leur stabilité dans le milieu acide des compositions d'enduction à base de phosphate de zinc permet d'obtenir un système en un seul emballage. L'utilisation du tungstène évite le recours aux ions nickel ou cobalt qui rendent ces compositions nuisibles à l'environnement.

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