Global Patent Index - EP 1207220 A1

EP 1207220 A1 20020522 - Method for surface treatment of aluminum or aluminum alloy

Title (en)

Method for surface treatment of aluminum or aluminum alloy

Title (de)

Verfahren zur Oberflächenbehandlung von Aluminium und Aluminiumlegierung

Title (fr)

Methode pour le traitement de surface d'aluminium et d'alliage d'aluminium

Publication

EP 1207220 A1 20020522 (EN)

Application

EP 01125530 A 20011025

Priority

JP 2000325941 A 20001025

Abstract (en)

This method employs the electrolyte which consists mainly of a sulfuric acid bath, an oxalic acid bath, or their mixture bath added with either a metal nitrate selected from silver nitrate, copper nitrate, and their combination or a metal sulfate selected from silver sulfate, copper sulfate, and their combination and allows the base material immersed in the electrolyte to be fed with an AC/DC combined current, a negative PR waveform current, or a negative pulse waveform current so as to develop an anodized layer on the surface of the base material and simultaneously deposit in the anodized layer a metal separated from either the metal nitrate or the metal sulfate. Accordingly, both the development of the anodized layer and the deposition of metal can be implemented by a single action of the electrolytic process. <IMAGE>

IPC 1-7

C25D 11/04; C25D 11/06

IPC 8 full level

C25D 11/04 (2006.01); C25D 11/06 (2006.01); C25D 11/22 (2006.01); C25D 11/08 (2006.01); C25D 11/14 (2006.01); C25D 11/16 (2006.01)

CPC (source: EP)

C25D 11/024 (2013.01); C25D 11/04 (2013.01); C25D 11/06 (2013.01); C25D 11/22 (2013.01)

Citation (search report)

Designated contracting state (EPC)

DE FR GB IT

DOCDB simple family (publication)

EP 1207220 A1 20020522; EP 1207220 B1 20080116; CN 1181228 C 20041222; CN 1351196 A 20020529; DE 60132422 D1 20080306

DOCDB simple family (application)

EP 01125530 A 20011025; CN 01137508 A 20011025; DE 60132422 T 20011025