Bath for the galvanic deposition of gold and gold alloys,...

Details Bath for the galvanic deposition of gold and gold alloys,... Bath for the galvanic deposition of gold and gold alloys,...

C - Chemistry, Metallurgy

25

D

C25D 3/62 (2006.01) C25D 3/48 (2006.01)

Patent

CA 2438207

The invention relates to a bath for the galvanic deposition of gold and gold alloys, and to the use thereof for producing dental shaped elements, wherein the gold is present in the form of a gold sulfite complex. The inventive bath and the inventive use are characterized in that at least one bismuth compound is present in addition to the optional other metals and conventional additives for gold sulfites of the above-described kind. The bismuth compound is preferably a complex compound, especially one that contains the complexing agents NTA, HEDTA, TEPA, DTPA, EDNTA or EDTA. The invention has several advantages, the most important being that the bismuth can be added to the bath already when it is prepared. The invention provides for a bath that is functional for a long period and that does not necessarily require the addition of other additives before galvanization.

L'invention concerne un bain électrolytique pour déposer de l'or et des alliages en or, et son utilisation pour la fabrication de corps moulés dentaires. L'or de ce bain se présente sous forme de complexe d'aurosulfite. L'invention est caractérisée en ce que le bain contient, outre d'autres métaux éventuels et les additifs usuels pour de tels bains d'aurosulfite, au moins un composé bismuth. Ce composé bismuth est de préférence un composé complexe contenant en particulier les agents complexants NTA, HEDTA, TEPA, DTPA, EDNTA ou EDTA. Cette invention présente toute une série d'avantages, parmi lesquels il est à noter que le bismuth peut être ajouté au bain dès sa réalisation, ce qui permet à l'utilisateur de disposer d'un bain fonctionnel pendant une durée prolongée, bain auquel il n'est pas obligatoire d'ajouter d'autres additifs avant la galvanisation.

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