Global patent index - EP 1017878 A1

EP 1017878 A1 2000-07-12 - CHROMATE TREATMENT OR POSTPASSIVATION WITH STABILISED SOLUTIONS BASED ON Cr (III)/(VI)

Title (en)

CHROMATE TREATMENT OR POSTPASSIVATION WITH STABILISED SOLUTIONS BASED ON Cr (III)/(VI)

Title (de)

CHROMATIERUNG ODER NACHPASSIVIERUNG MIT STABILISIERTEN Cr(III)/Cr(VI)-HALTIGEN LÖSUNGEN

Title (fr)

CHROMATATION OU POSTPASSIVATION AVEC DES SOLUTIONS STABILISEES A BASE DE Cr(III)/Cr(VI)

Publication

EP 1017878 A1 (DE)

Application

EP 98951353 A

Priority

  • DE 19740248 A
  • EP 9805630 W

Abstract (en)

[origin: DE19740248A1] An aqueous chromating or post-passivating solution, which contains trivalent and hexavalent chromium and acetate ions, has a pH of 3.9-5.0 and contains 0.1-10 g/l acetate ions. An aqueous chromating or post-passivating solution has a pH of 3.9-5.0, a total chromium content of 0.1-10 g/l, a Cr(III):Cr(VI) ratio of 1:1-4 and an acetate ion content of 0.1-10 g/l. Independent claims are also included for (i) an aqueous concentrate which, on dilution by a factor of 50-2000 with water, gives the above solution; and (ii) a chromating or post-passivating treatment, in which the metal surfaces are contacted for 1-120 secs. with the above solution at 20-60 deg C. Preferred Feature: The solution additionally contains one or more of up to 0.5 g/l fluoride ions, up to 1.0 g/l zirconium and/or titanium compounds, up to 0.5 g/l phosphate ions, up to 0.5 g/l nickel(II) ions and up to 0.5 g/l iron(III) ions.

IPC 1-7 (main, further and additional classification)

C23C 22/30; C23C 22/33; C23C 22/37; C23C 22/38; C23C 22/83

IPC 8 full level (invention and additional information)

C23C 22/30 (2006.01); C23C 22/33 (2006.01); C23C 22/37 (2006.01); C23C 22/38 (2006.01); C23C 22/83 (2006.01)

CPC (invention and additional information)

C23C 22/37 (2013.01); C23C 22/30 (2013.01); C23C 22/33 (2013.01); C23C 22/38 (2013.01); C23C 22/83 (2013.01)

Citation (search report)

See references of WO 9914398A1

Designated contracting state (EPC)

BE DE ES FR GB IT SE

EPO simple patent family

DE 19740248 A1 19990318; CA 2303101 A1 19990325; EP 1017878 A1 20000712; WO 9914398 A1 19990325; ZA 9808356 B 19990312

INPADOC legal status

2002-12-18 [18R] REFUSED

- Ref Legal Event Code: 18R

- Effective date: 20020725

2002-03-13 [17Q] FIRST EXAMINATION REPORT

- Ref Legal Event Code: 17Q

- Effective date: 20020131

2000-07-12 [17P] REQUEST FOR EXAMINATION FILED

- Ref Legal Event Code: 17P

- Effective date: 20000303

2000-07-12 [AK] DESIGNATED CONTRACTING STATES:

- Ref Legal Event Code: AK

- Designated State(s): BE DE ES FR GB IT SE