EP 0351680 B1 19921104 - USE OF P-TOLUENE SULFONIC ACID IN THE ELECTROLYTIC COLOURING OF ANODICALLY OBTAINED ALUMINIUM SURFACES
Title (en)
USE OF P-TOLUENE SULFONIC ACID IN THE ELECTROLYTIC COLOURING OF ANODICALLY OBTAINED ALUMINIUM SURFACES
Publication
Application
Priority
DE 3824402 A 19880719
Abstract (en)
[origin: US4917780A] Undesirable greenish tinges that normally result when coloring anodized aluminum by AC electrolysis in solutions of silver salts can be avoided by adding to the electrolytes an appropriate amount of p-toluenesulfonic acid and/or its salts. The coloring solution may also contain (i) sulfuric acid, (ii) alkali metal, ammonium and/or alkaline earth metal salts of sulfuric acid and/or (iii) alkali metal, ammonium and/or alkaline earth metal acetates.
IPC 1-7
IPC 8 full level
C25D 11/22 (2006.01)
CPC (source: EP KR US)
C25D 11/14 (2013.01 - KR); 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 0351680 A1 19900124; EP 0351680 B1 19921104; AT E82022 T1 19921115; AU 3824489 A 19900125; AU 609320 B2 19910426; BR 8903540 A 19900313; DE 3824402 A1 19900125; DE 58902601 D1 19921210; ES 2035994 T3 19930501; GR 3006151 T3 19930621; JP H0273993 A 19900313; KR 900001886 A 19900227; NZ 229977 A 19900828; US 4917780 A 19900417; ZA 895471 B 19900328
DOCDB simple family (application)
EP 89112555 A 19890710; AT 89112555 T 19890710; AU 3824489 A 19890718; BR 8903540 A 19890718; DE 3824402 A 19880719; DE 58902601 T 19890710; ES 89112555 T 19890710; GR 920402464 T 19921105; JP 18723589 A 19890719; KR 890010185 A 19890718; NZ 22997789 A 19890718; US 38261189 A 19890719; ZA 895471 A 19890718