EP 0213590 B1 19910717 - PROCESS FOR FORMING CONVERSION LAYERS ON ZINC AND/OR ZINC/ALUMINIUM ALLOYS
Title (en)
PROCESS FOR FORMING CONVERSION LAYERS ON ZINC AND/OR ZINC/ALUMINIUM ALLOYS
Publication
Application
Priority
US 77340585 A 19850906
Abstract (en)
[origin: EP0213590A1] An aqueous acidic treating solution for forming a chromium-containing passivate coating on the surface of zinc or zinc-aluminium alloys contains chromium ions of which the predominant proportion are in the hexavalent state, preferably in an amount 2-20 g/l., nitrate ions, preferably in an amount 0.5-6 g/l., and phosphate ions, preferably in an amount 1-15 g/l. The solution may also contain fluoride ions, molybdate ions and tungstate ions. The phosphide may be an alkali metal or ammonium phosphate, a polyphosphate or phosphoric acid.
IPC 1-7
IPC 8 full level
C23C 22/24 (2006.01); C23C 22/33 (2006.01); C23C 22/37 (2006.01); C23C 22/38 (2006.01); C23C 22/40 (2006.01); C23C 22/44 (2006.01)
CPC (source: EP KR)
C23C 22/06 (2013.01 - KR); C23C 22/33 (2013.01 - EP); C23C 22/38 (2013.01 - EP); C23C 22/44 (2013.01 - EP)
Designated contracting state (EPC)
AT BE DE FR IT SE
DOCDB simple family (publication)
EP 0213590 A1 19870311; EP 0213590 B1 19910717; AT E65266 T1 19910815; AU 5875286 A 19870312; AU 590885 B2 19891123; CA 1274754 A 19901002; DE 3628660 A1 19870319; DE 3680263 D1 19910822; ES 2001659 A6 19880601; GB 2179960 A 19870318; GB 2179960 B 19900124; GB 8621560 D0 19861015; JP S6256579 A 19870312; KR 870003229 A 19870416; NZ 216539 A 19890224
DOCDB simple family (application)
EP 86111789 A 19860826; AT 86111789 T 19860826; AU 5875286 A 19860616; CA 511361 A 19860611; DE 3628660 A 19860823; DE 3680263 T 19860826; ES 8601629 A 19860904; GB 8621560 A 19860908; JP 20356386 A 19860829; KR 860006734 A 19860814; NZ 21653986 A 19860616