EP 0780495 B1 20010509 - Process for obtaining a brochantit patina on a copper surface
Title (en)
Process for obtaining a brochantit patina on a copper surface
Title (de)
Verfahren zur Erzeugung von Brochantit-Patina auf einer aus Kupfer bestehenden Oberfläche
Title (fr)
Procédé pour obtenir une patine de brochantit sur une surface en cuivre
Publication
Application
Priority
DE 19548261 A 19951222
Abstract (en)
[origin: EP0780495A2] A brochantite patina is generated on a copper surface in a continuous process in which the surface is first roughened and then made the anode in an electrolysis bath containing Na2CO3 and/or NaHCO3 and a salt of a sulphur containing acid. The temperature is 30-90 degrees C, the current density 1-20 A/dm<2> and the dwell time 10 seconds to 12 minutes. After rinsing it is then treated in a fixing bath containing at least one oxidising agent selected from H2O2, KClO3, K2S2O8, KMnO4 or CuSO4. The temperature is 35-95 degrees C and the dwell time 10-120 seconds. Finally it is rinsed and dried.
IPC 1-7
IPC 8 full level
C25D 11/34 (2006.01)
CPC (source: EP US)
C25D 11/34 (2013.01 - EP US)
Designated contracting state (EPC)
AT BE CH DE DK ES FI FR GB GR IE IT LI LU MC NL PT SE
DOCDB simple family (publication)
EP 0780495 A2 19970625; EP 0780495 A3 19970827; EP 0780495 B1 20010509; AT E201059 T1 20010515; CA 2190419 A1 19970623; CA 2190419 C 20001107; DE 19548261 A1 19970626; DE 59606874 D1 20010613; DK 0780495 T3 20010611; ES 2156248 T3 20010616; GR 3036263 T3 20011031; PT 780495 E 20010927; US 5714052 A 19980203
DOCDB simple family (application)
EP 96119420 A 19961204; AT 96119420 T 19961204; CA 2190419 A 19961115; DE 19548261 A 19951222; DE 59606874 T 19961204; DK 96119420 T 19961204; ES 96119420 T 19961204; GR 20010401112 T 20010724; PT 96119420 T 19961204; US 77220096 A 19961220