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1. (WO1991006693) PROTECTION OF LEAD-CONTAINING ANODES DURING CHROMIUM ELECTROPLATING
Latest bibliographic data on file with the International Bureau

Pub. No.: WO/1991/006693 International Application No.: PCT/US1990/006422
Publication Date: 16.05.1991 International Filing Date: 06.11.1990
IPC:
C25D 3/04 (2006.01) ,C25D 21/14 (2006.01)
C CHEMISTRY; METALLURGY
25
ELECTROLYTIC OR ELECTROPHORETIC PROCESSES; APPARATUS THEREFOR
D
PROCESSES FOR THE ELECTROLYTIC OR ELECTROPHORETIC PRODUCTION OF COATINGS; ELECTROFORMING; JOINING WORKPIECES BY ELECTROLYSIS; APPARATUS THEREFOR
3
Electroplating; Baths therefor
02
from solutions
04
of chromium
C CHEMISTRY; METALLURGY
25
ELECTROLYTIC OR ELECTROPHORETIC PROCESSES; APPARATUS THEREFOR
D
PROCESSES FOR THE ELECTROLYTIC OR ELECTROPHORETIC PRODUCTION OF COATINGS; ELECTROFORMING; JOINING WORKPIECES BY ELECTROLYSIS; APPARATUS THEREFOR
21
Processes for servicing or operating cells for electrolytic coating
12
Process control or regulation
14
Controlled addition of electrolyte components
Applicants:
ATOCHEM NORTH AMERICA, INC. [US/US]; Three Parkway Philadelphia, PA 19102, US
Inventors:
NEWBY, Kenneth, Russ; US
Agent:
HENN, Robert, B.; Atochem North America, Inc. Three Parkway Philadelphia, PA 19102, US
Priority Data:
431,96306.11.1989US
Title (EN) PROTECTION OF LEAD-CONTAINING ANODES DURING CHROMIUM ELECTROPLATING
(FR) PROTECTION DES ANODES CONTENANT DU PLOMB PENDANT L'ELECTRODEPOSITION DE CHROME
Abstract:
(EN) 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.
(FR) 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.
Designated States: AU, BR, CA, JP
European Patent Office (AT, BE, CH, DE, DK, ES, FR, GB, GR, IT, LU, NL, SE)
Publication Language: English (EN)
Filing Language: English (EN)
Also published as:
EP0452471CA2054201AU1990067569