C - Chemistry – Metallurgy – 25 – D
Patent
C - Chemistry, Metallurgy
25
D
C25D 3/04 (2006.01) B41N 7/04 (2006.01) C25D 3/10 (2006.01) C25D 5/14 (2006.01) C25D 5/18 (2006.01) C25D 7/00 (2006.01)
Patent
CA 2334708
The invention relates to a galvanic bath, to a method for precipitating chromium onto objects using said galvanic bath, and to the use of this method for producing structured hard chromium layers on machine parts. The galvanic bath contains at least one compound which provides chromium (VI) ions, in an aqueous solution, and comprises a) a quantity of chromium (VI) ions corresponding to 100 to 600 g/l chromic acid anhydride, b) sulphate ions in the form of sulphuric acid and/or a soluble salt thereof, the molar concentration ratio of chromium (VI) ions to sulphate ions (SO42-) being 90:1 to 120:1 and c) a quantity of 2-hydroxyethane sulphonate ions corresponding to 0.01 to 3.0 g/l of the sodium salt.
L'invention concerne un bain galvanique, un procédé permettant de précipiter du chrome sur des objets au moyen dudit bain et l'utilisation dudit procédé pour produire des couches structurées de chrome dur sur des constituants de machines. Le bain galvanique, qui contient en solution aqueuse au moins un composé libérant des ions chrome VI, comprend a) des ions chrome VI en une quantité comprise entre 100 et 600 g/l d'anhydride d'acide chromique, b) des ions sulfate sous forme d'acide sulfurique et/ou d'un sel soluble de celui-ci, à une concentration donnant un rapport molaire entre les ions chrome VI et les ions sulfate (SO¿4??2-¿) compris entre 90/1 et 120/1, et c) des ions hydroxyéthanesulfonate en une quantité comprise entre 0,01 et 3,0 g/l du sel de sodium.
Cromotec Oberflachentechnik Gmbh
Ogilvy Renault Llp/s.e.n.c.r.l.,s.r.l.
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