Global Patent Index - EP 1678345 A1

EP 1678345 A1 20060712 - COLOURED CONVERSION LAYERS DEVOID OF CHROME FORMED ON METAL SURFACES

Title (en)

COLOURED CONVERSION LAYERS DEVOID OF CHROME FORMED ON METAL SURFACES

Title (de)

FARBIGE CHROMFREIE KONVERSIONSSCHICHTEN AUF METALLOBERFLÄCHEN

Title (fr)

COUCHES DE CONVERSION COLOREES SANS CHROME FORMEES SUR DES SURFACES METALLIQUES

Publication

EP 1678345 A1 20060712 (DE)

Application

EP 04790238 A 20041009

Priority

  • EP 2004011315 W 20041009
  • DE 10352076 A 20031107

Abstract (en)

[origin: WO2005047565A1] The invention relates to a method which is used to produce coloured layers on zinc, aluminium, magnesium or alloy surfaces. The surfaces are brought into contact with an aqueous treatment solution which is devoid of chrome, said solution containing, in total, 3 - 35 g/l persulfate ions and/or peroxodisulfate ions and not more than 10 g/l ammonia or ammonium ions, it has a pH value in the region of between 10 - 12 and a temperature in the range of between 30 - 80 DEG C. The surfaces are brought into contact with the treatment solution for a period in the region of 0.5 - 5 minutes and optionally, they are covered with a coating based on organic polymers. The invention further relates to metal parts treated according to said method.

IPC 1-7

C23C 22/66; C23C 22/60; C23C 22/73; B05D 7/14

IPC 8 full level

C23C 22/60 (2006.01); C23C 22/66 (2006.01); C23C 22/73 (2006.01)

CPC (source: EP US)

C23C 22/60 (2013.01 - EP US); C23C 22/66 (2013.01 - EP US); C23C 22/73 (2013.01 - EP US)

Designated contracting state (EPC)

AT BE BG CH CY CZ DE DK EE ES FI FR GB GR HU IE IT LI LU MC NL PL PT RO SE SI SK TR

DOCDB simple family (publication)

WO 2005047565 A1 20050526; EP 1678345 A1 20060712; EP 1678345 B1 20131120; US 2006272748 A1 20061207; US 2011011498 A1 20110120; US 7828911 B2 20101109; US 8268096 B2 20120918

DOCDB simple family (application)

EP 2004011315 W 20041009; EP 04790238 A 20041009; US 41842006 A 20060504; US 88946310 A 20100924