Aqueous alkaline cyanide-free bath for the galvanic...

Details Aqueous alkaline cyanide-free bath for the galvanic... Aqueous alkaline cyanide-free bath for the galvanic...

C - Chemistry, Metallurgy

25

D

C25D 3/22 (2006.01) C25D 3/56 (2006.01)

Patent

CA 2342219

An aqueous alkaline cyanide-free bath for the galvanic deposition of zinc or zinc alloy coatings on substrate surfaces is described, which contains in addition to a source of zinc ions and optionally a source of further metal ions, also hydroxide ions and a polymer of the general formula A that is soluble in the bath (see formula A) as well as optionally conventional additives. The bath may furthermore contain a quaternary derivative of a pyridine-3-carboxylic acid of the formula B and/or a quaternary derivative of a pyridine-3-carboxylic acid of the formula C (see formula C) A process for the galvanic deposition of zinc coatings and zinc alloy coatings using the aforedescribed bath is also described. By using the baths according to the invention it is possible to produce coatings that exhibit a uniform layer thickness combined with a high gloss, and which do not exhibit any tendency to exfoliate.

L'invention concerne un bain alcalin aqueux exempt de cyanure s'utilisant pour le dépôt par galvanisation de revêtements en zinc ou en alliage de zinc, sur des surfaces de substrat, qui contient, outre une source d'ions de zinc et éventuellement une source d'autres ions métalliques, des ions d'hydroxyde et un polymère de la formule générale (A), soluble dans ledit bain, ainsi qu'éventuellement des additifs classiques. Ce bain peut en outre contenir un dérivé quaternaire d'un acide pyridine-3-carboxylique de la formule (B) et/ou un dérivé quaternaire d'un acide pyridine-3-carboxylique de la formule (C). L'invention concerne également un procédé de dépôt par galvanisation de revêtements en zinc ou en alliage de zinc, à l'aide du bain décrit ci-dessus. L'utilisation des bains obtenus selon l'invention permet d'obtenir des revêtements d'épaisseur régulière et à haut degré de brillance, qui n'ont pas tendance à s'écailler.

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