EP 0137540 A3 19870527 - PROCESS FOR THE ELECTROLYTIC ZINC PLATING OF STEEL
Title (en)
PROCESS FOR THE ELECTROLYTIC ZINC PLATING OF STEEL
Publication
Application
Priority
DE 3335009 A 19830928
Abstract (en)
[origin: US4547269A] A process of electrodepositing zinc on steel wherein zinc-containing aqueous sulfuric acid electrolytes are used which contain one or more oxyacids of sulfur in which the sulfur has an oxidation number from +5 to +1. The phosphatizing of the resulting zinc coatings results in phosphate coatings which are virtually free of spots. Suitable oxyacids are sulfurous acid (H2SO3), sulfoxylic acid (H2SO2), hyposulfurous acid (H2S2O4) and/or thiosulfuric acid (H2S2O3) in the form of acids, salts and acid anhydrides. The oxyacids should be present in the electrolyte in a concentration of 0.05 to 10 g/l, preferably 0.1 to 2 g/l.
IPC 1-7
IPC 8 full level
CPC (source: EP US)
C25D 3/22 (2013.01 - EP US)
Citation (search report)
- [A] US 1607869 A 19261123 - COLCORD FRANK F
- [A] US 1380142 A 19210531 - HANSON HUGO H, et al
- [A] US 3637475 A 19720125 - BERECZKY TIBERIU, et al
- [A] US 3850766 A 19741126 - KOSMOS J
- [X] THE ELECTROCHEMICAL SOCIETY, Band 80, 1941, Seiten 387-398; E.H. LYONS JR.: "Acid zinc plating"
- [X] H.W. DETTNER et al.: "Handbuch der Galvanotechnik", Band II, Seiten 293-294, Carl Hanser Verlag, M}nchen, DE;
- [A] METAL FINISHING ABSTRACTS, Band 24, Nr. 4, Juli/August 1982, Seite 242, Teddington, Middlesex, GB; & SU-A-905 335 (E.E. KRAVTSOV et al.)
Designated contracting state (EPC)
AT BE DE FR GB IT LU NL SE
DOCDB simple family (publication)
EP 0137540 A2 19850417; EP 0137540 A3 19870527; DE 3335009 A1 19850418; ES 535855 A0 19851216; ES 8605872 A1 19851216; JP S6092495 A 19850524; US 4547269 A 19851015
DOCDB simple family (application)
EP 84201280 A 19840907; DE 3335009 A 19830928; ES 535855 A 19840912; JP 20397084 A 19840928; US 65350484 A 19840921