EP 0675976 A1 19951011 - METHOD FOR THE ELECTROLYTIC INKING OF ALUMINIUM SURFACES USING A.C.
Title (en)
METHOD FOR THE ELECTROLYTIC INKING OF ALUMINIUM SURFACES USING A.C.
Title (de)
VERFAHREN ZUR ELEKTROLYTISCHEN WECHSELSTROMEINFÄRBUNG VON ALUMINIUMOBERFLÄCHEN.
Title (fr)
PROCEDE D'ENCRAGE ELECTROLYTIQUE DE SURFACES EN ALUMINIUM A L'AIDE DE COURANT ALTERNATIF.
Publication
Application
Priority
- DE 4244021 A 19921224
- EP 9303574 W 19931216
Abstract (en)
[origin: US5587063A] PCT No. PCT/EP93/03574 Sec. 371 Date Jul. 28, 1995 Sec. 102(e) Date Jul. 28, 1995 PCT Filed Dec. 16, 1993 PCT Pub. No. WO94/15002 PCT Pub. Date Jul. 7, 1994Anodized aluminum surfaces are electrolytically colored using alternating current in a process in which two different coloring baths are sequentially employed. One bath contains copper(II) ions and an additive which improves throwing power thereby providing uniform distribution of the depth of color. The other bath contains tin(II) ions, silver ions, or both tin(II) and silver ions. If tin(II) ions are included, additives which stabilize tin(II) ions and improve throwing power are also included. Either bath may be used first. The use of two separate coloring baths provides colored aluminum surfaces which have excellent resistance to corrosion. Workpieces with reddish-gold hues and darker tones can be produced.
IPC 1-7
IPC 8 full level
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 IT LI NL SE
DOCDB simple family (publication)
US 5587063 A 19961224; AT E142716 T1 19960915; DE 4244021 A1 19940630; DE 59303783 D1 19961017; EP 0675976 A1 19951011; EP 0675976 B1 19960911; ES 2091131 T3 19961016; JP H08504889 A 19960528; WO 9415002 A1 19940707
DOCDB simple family (application)
US 46470295 A 19950728; AT 94903803 T 19931216; DE 4244021 A 19921224; DE 59303783 T 19931216; EP 9303574 W 19931216; EP 94903803 A 19931216; ES 94903803 T 19931216; JP 51477894 A 19931216