Satin-finished nickel or nickel alloy coating

C - Chemistry – Metallurgy – 25 – D

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C25D 3/12 (2006.01) C25D 3/56 (2006.01)

Patent

CA 2407157

In order to achieve an even satin-finished nickel or nickel alloy coating an acid nickel or nickel alloy electroplating bath is proposed which contains a sulfosuccinic acid compound of the general formula (I) additional to at least one quaternary ammonium compound, wherein R1, R2 = hydrogen ion, alkali ion, alkaline earth ion, ammonium ion and/or C1-C18 hydrocarbon moiety, wherein R1 and R2 are identical or different with the proviso that at the most one of the groups R1 and R2 = hydrogen ion, alkali ion, and alkaline earth ion, and wherein K+ = hydrogen ion, alkaline ion, alkaline earth ion, ammonium ion.

Selon l'invention, pour réaliser un revêtement en nickel satiné uni ou en alliage de nickel, il est proposé un bain d'acide de nickel ou de galvanoplastie pour alliage de nickel contenant un composé d'acide sulfosuccinique de la formule générale I ajouté à au moins un composé d'ammonium quaternaire, dans laquelle R1, R2 = un ion d'hydrogène, un ion alcalin, un ion alcalino-terreux, un ion d'ammonium et/ou une C1-C18 fraction d'hydrocarbure, R1 et R2 étant identiques ou différents pour autant qu'au maximum un des groupes R1 et R2 représente un ion d'hydrogène, un ion alcalin, un ion alcalino-terreux, K<+> représentant un ion d'hydrogène, un ion alcalin, un ion alcalino-terreux, un ion d'ammoniac.

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