C - Chemistry – Metallurgy – 25 – D
Patent
C - Chemistry, Metallurgy
25
D
C25D 3/04 (2006.01) C25D 21/14 (2006.01)
Patent
CA 2054201
The present invention provides a process for electroplating chromium using lead anodes while achieving the advantages of using methanesulfonic acid without suffering the excessive anode-corrosion characteristics associated with that acid. Accordingly, chromium is electrodeposited from a bath containing chromic acid, sulfate and an alkylpolysulfonic acid containing from one to about three carbon atoms. The invention also provides a plating process for chromium electrodeposition, a plating bath for use in the inventive process, and a replenishment composition for existing plating baths.
L'invention se rapporte à un procédé d'électrodéposition de chrome utilisant des anodes de plomb, qui conserve les avantages d'utilisation de l'acide méthanesulfonique tout en empêchant la corrosion excessive des anodes généralement associée à l'utilisation de cet acide. Selon la présente invention, le chrome est électrodéposé à partir d'un bain contenant de l'acide chromique, du sulfate et de l'acide alkylpolysulfonique renfermant un à environ trois atomes de carbone. L'invention se rapporte également à un procédé de galvanoplastie pour l'électrodéposition de chrome, a un bain galvanoplastique utilisable dans le procédé de la présente invention, ainsi qu'à une composition de nourrissage pour bains galvanoplastiques existants.
Atotech Deutschland Gmbh
Borden Ladner Gervais Llp
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