C - Chemistry – Metallurgy – 23 – C
Patent
C - Chemistry, Metallurgy
23
C
C23C 18/36 (2006.01) C23C 18/16 (2006.01)
Patent
CA 2241794
Orthophosphite ions produced by oxidation of hypophosphite in an electroless nickel plating bath can be removed by precipitation with an alkali metal or alkaline earth metal cation such as calcium. In order to avoid the precipitation of calcium sulfate and the generation of large amounts of particulates in the bath, nickel sulfate can be replaced by a nickel salt of an alkylsulfonic acid or hypophosphorous acid, whose anion forms a soluble salt with an alkali metal or alkaline earth metal cation.
Il est possible d'extraire d'un bain de plaquage au nickel non électrolytique les ions d'orthophosphite résultant de l'oxydation de l'hypophosphite par précipitation d'un cation de métal alcalin ou alcalino-terreux tel que le calcium. Pour éviter la précipitation du sulfate de calcium et la production de quantités importantes de matières particulaires dans le bain, le sulfate de nickel peut être remplacé par un sel de nickel d'un acide alkylsulfonique ou hypophosphoreux dont l'anion forme un sel soluble avec un cation de métal alcalin ou alcalino-terreux.
Martyak Nicholas Michael
Mccaskie John Edward
Atotech Deutschland Gmbh
Borden Ladner Gervais Llp
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