Bath for the electrolytic deposition of a palladium- nickel...

Details Bath for the electrolytic deposition of a palladium- nickel... Bath for the electrolytic deposition of a palladium- nickel...

C - Chemistry, Metallurgy

25

D

204/26

C25D 3/56 (2006.01)

Patent

CA 1176204

ABSTRACT OF THE DISCLOSURE An improved bath for the electrolytic deposition of a palladium-nickel alloy for decorative and/or technical finishes is disclosed, comprising an aqueous solution of palladium- and nickel-ammines having a palladium content in the range 5 to 30 g/l, a nickel content in the range 5 to 30 g/l wherein the ratio of palladium to nickel is adjusted so that the alloy electrolytically deposited therefrom has a palladium content of 30 to 90% by weight, wherein the improvement is the addition, to improve mixed crystal formation, of one or more of the following: sodium vinylsulphonate sodium allylsulphonate sodium propynesulphonate sodium methallylsulphonate N-pyridinium propylsulphobetaine N-pyridinium ethylsulphobetaine sodium N-benzylpyridinium-2-ethylsulphonate. Coatings prepared from such baths have improved corrosion resistance and gloss.

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