EP 0584096 B1 19960110 - PROCESS FOR ELECTROLYTICALLY COATING A STEEL OBJECT ON ONE OR BOTH SIDES
Title (en)
PROCESS FOR ELECTROLYTICALLY COATING A STEEL OBJECT ON ONE OR BOTH SIDES
Title (de)
VERFAHREN ZUM EIN- ODER BEIDSEITIGEN ELEKTROLYTISCHEN BESCHICHTEN EINES GEGENSTANDES AUS STAHL
Title (fr)
PROCEDE POUR APPLIQUER UN REVETEMENT ELECTROLYTIQUE EN ACIER, SUR L'UNE DES FACES OU SUR LES DEUX FACES D'UN OBJET
Publication
Application
Priority
- AT 9200068 W 19920513
- AT 98091 A 19910513
Abstract (en)
[origin: WO9220839A1] A process for electrolytically coating a steel object on one or both sides, preferably a steel strip with zinc or a zinc-iron alloy, in which the object is connected as the cathode in a galvanic cell and metallic zinc or a zinc-iron alloy is deposited upon the object from an aqueous solution of zinc chloride with a pH of 0.1 to 3.0, and preferably 1.0 to 2.0, using insoluble anodes. For the deposition of metallic zinc, the concentration of the zinc chloride solution is set from 50 to 1000 g/l ZnCl2 and that of divalent iron ions from 0.5 to 60 g/l and the mol ratio of zinc to iron in the electrolyte is maintained at 3 or over. Part of the flow of the electrolyte solution is preferably continuously fed into a column filled with metallic zinc in which the trivalent iron is reduced during electrolysis to divalent iron and at the same time metallic zinc is dissolved. In order to deposit a zinc-iron alloy, the mol ratio of zinc to iron in the electrolyte is set at under 3. The invention also includes a device for the advantageous performance of the process.
IPC 1-7
IPC 8 full level
C25D 3/22 (2006.01); C25D 3/56 (2006.01); C25D 5/08 (2006.01); C25D 5/26 (2006.01); C25D 21/14 (2006.01); F03D 9/00 (2006.01); F03D 11/02 (2006.01)
CPC (source: EP US)
C25D 3/22 (2013.01 - EP US); C25D 3/565 (2013.01 - EP US); C25D 21/14 (2013.01 - EP US)
Designated contracting state (EPC)
BE DE ES FR GB IT
DOCDB simple family (publication)
WO 9220839 A1 19921126; AT 397663 B 19940627; AT A98091 A 19931015; BR 9205997 A 19951114; DE 59205029 D1 19960222; EP 0584096 A1 19940302; EP 0584096 B1 19960110; JP 2719046 B2 19980225; JP H06507205 A 19940811; KR 100232084 B1 19991201; US 5637205 A 19970610
DOCDB simple family (application)
AT 9200068 W 19920513; AT 98091 A 19910513; BR 9205997 A 19920513; DE 59205029 T 19920513; EP 92908752 A 19920513; JP 50911292 A 19920513; KR 930703422 A 19931112; US 14612893 A 19931220