EP 0354365 B1 19930421 - PROCESS FOR ELECTROLYTICALLY COLOURING ANODISED ALUMINIUM SURFACES WITH METAL SALTS
Title (en)
PROCESS FOR ELECTROLYTICALLY COLOURING ANODISED ALUMINIUM SURFACES WITH METAL SALTS
Publication
Application
Priority
DE 3824403 A 19880719
Abstract (en)
[origin: EP0354365A1] The invention relates to a process for electrolytically colouring anodised surfaces of aluminium and aluminium alloys with metal salts, wherein a defined oxide layer is first produced by means of direct current in acidic solution and this is then coloured by means of an alternating current or an alternating current with superposed direct current, using an acidic electrolyte containing tin(II) salts. The subject of the invention is the addition of water-soluble compounds of the general formulae (I) to (IV) which stabilise tin(II) salts <IMAGE> where R1 is hydrogen, alkyl, aryl, alkylaryl, alkylarylsulphonic acid, alkyl sulphonic acid and alkali metal salts thereof, each having 1 to 22 carbon atoms, R2 is hydrogen, alkyl, aryl, alkylaryl, alkylarylsulphonic acid, alkylsulphonic acid and alkali metal salts thereof, each having 1 to 22 carbon atoms, R3 represents one or more hydrogen atoms and/or alkyl, aryl or alkylaryl radicals having 1 to 22 carbon atoms and R4 and R5 represent one or more hydrogen atoms, alkyl, aryl and/or alkylaryl radicals, sulphonic acid, alkylsulphonic acid, alkylarylsulphonic acid and alkali metal salts thereof having 1 to 22 carbon atoms, at least one of the radicals R1, R2 and R3 being a radical other than hydrogen. <IMAGE>
IPC 1-7
IPC 8 full level
C25D 11/12 (2006.01); C25D 11/22 (2006.01)
CPC (source: EP US)
C25D 11/22 (2013.01 - EP US)
Designated contracting state (EPC)
AT BE CH DE ES FR GB GR IT LI NL SE
DOCDB simple family (publication)
EP 0354365 A1 19900214; EP 0354365 B1 19930421; AR 241811 A1 19921230; AT E88510 T1 19930515; AU 3824289 A 19900125; AU 608992 B2 19910418; BR 8903541 A 19900313; CA 1339115 C 19970729; CN 1039452 A 19900207; CN 1041446 C 19981230; DD 284061 A5 19901031; DE 3824403 A1 19900125; DE 58904127 D1 19930527; DK 355689 A 19900120; DK 355689 D0 19890718; ES 2041899 T3 19931201; FI 893466 A0 19890718; FI 893466 A 19900120; FI 89812 B 19930813; FI 89812 C 19931125; HU 205973 B 19920728; HU T50888 A 19900328; JP 2916168 B2 19990705; JP H0273994 A 19900313; KR 900001887 A 19900227; KR 960011248 B1 19960821; MX 173050 B 19940131; NO 177233 B 19950502; NO 177233 C 19950809; NO 892946 D0 19890718; NO 892946 L 19900122; NZ 229976 A 19910426; PL 162190 B1 19930930; PT 91208 A 19900208; PT 91208 B 19950301; SU 1722235 A3 19920323; TR 23878 A 19901016; US 5064512 A 19911112; YU 142989 A 19910430; YU 46733 B 19940405; ZA 895472 B 19900328
DOCDB simple family (application)
EP 89112556 A 19890710; AR 31442389 A 19890717; AT 89112556 T 19890710; AU 3824289 A 19890718; BR 8903541 A 19890718; CA 606138 A 19890719; CN 89104889 A 19890717; DD 33090189 A 19890717; DE 3824403 A 19880719; DE 58904127 T 19890710; DK 355689 A 19890718; ES 89112556 T 19890710; FI 893466 A 19890718; HU 361089 A 19890718; JP 18723689 A 19890719; KR 890010103 A 19890715; MX 1680489 A 19890714; NO 892946 A 19890718; NZ 22997689 A 19890718; PL 28063889 A 19890718; PT 9120889 A 19890718; SU 4614535 A 19890718; TR 54389 A 19890703; US 38216689 A 19890719; YU 142989 A 19890717; ZA 895472 A 19890718