Phosphating method accelerated by n-oxides

Details Phosphating method accelerated by n-oxides Phosphating method accelerated by n-oxides

C - Chemistry, Metallurgy

23

C

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

Patent

CA 2300276

The invention relates to an acidic aqueous phosphating solution, containing 0.2 to 3g/l zinc ions, 3 to 50g/l phosphate ions, calculated as PO43-, and 0.05 to 4 g/l of an organic N-oxide. The N-oxide is preferably chosen from the N-oxides of substituted or non-substituted pyridines and morpholines, especially from pyridine-N-oxide, 2-methylpyridine-N-oxide, 4-methylpyridine-N- oxide, morpholine-N-oxide and N-methylmorpholine-N-oxide. The phosphating solution contains a co-accelerator; preferably chlorate, hydrogen peroxide, nitroguanidine and/or m-nitrobenzol sulfonate.

L'invention concerne une solution de phosphatation acide aqueuse contenant entre 0,2 et 3 g/l d'ions de zinc, entre 3 et 50 g/l d'ions de phosphate, figurant sous PO¿4??3-¿, ainsi que comme médiateur, entre 0,05 et 4 g/l d'un N-oxyde organique. Le N-oxyde est de préférence sélectionné dans les N-oxydes substitués ou des pyridines et des morpholines non substituées, notamment dans le groupe de pyridine-N-oxyde, 2-méthylpyridine-N-oxyde, 4-méthylpyridine-N-oxyde, morpholine-N-oxyde et N-méthylmorpholine-N-oxyde. La solution de phosphatation contient comme comédiateur, de préférence du chlorate, du peroxyde d'hydrogène, de la nitroguanidine et/ou du sulfonate de m-nitrobenzène.

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