Global Patent Index - EP 1074640 A1

EP 1074640 A1 2001-02-07 - ELECTROLYTIC PHOSPHATING PROCESS AND COMPOSITE COATING FORMED ON STEEL SURFACE

Title (en)

ELECTROLYTIC PHOSPHATING PROCESS AND COMPOSITE COATING FORMED ON STEEL SURFACE

Title (de)

ELEKTROLYTISCHER PHOSPHATIERUNGSPROZESS UND KOMPOSITBESCHICHTUNGEN, DIE AUF EINE STAHLOBERFLÄCHE AUFGEBRACHT SIND

Title (fr)

PROCEDE DE PHOSPHATATION ELECTROLYTIQUE ET REVETEMENT COMPOSITE FORME SUR UNE SURFACE D'ACIER

Publication

EP 1074640 A1 (EN)

Application

EP 99959898 A

Priority

  • JP 9907124 W
  • JP 35925498 A

Abstract (en)

The present invention provides a phosphate chemical treatment technology suitable for electrolytic treatment. The present invention discloses a phosphate chemical treatment bath containing at least phosphate ions and phosphoric acid, nitrate ions, metal ions that form a complex with phosphate ions in the phosphate chemical treatment bath, and metal ions for which the electrical potential, at which the ions of the metal dissolved in the phosphate chemical treatment bath are reduced and precipitate as metal, is equal to or greater than the anodic electrolytic reaction potential of water as the solvent; the concentration of metal ions other than those which are a component of the film in the treatment bath being 0-400 ppm, and the treatment bath being substantially free of solids that have an effect on the film formation reaction. <IMAGE>

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

C25D 11/36

IPC 8 full level (invention and additional information)

C25D 11/36 (2006.01)

CPC (invention and additional information)

C25D 11/36 (2013.01)

Designated contracting state (EPC)

DE FR GB

EPO simple patent family

EP 1074640 A1 20010207; EP 1074640 A4 20060621; BR 9907916 A 20020430; BR 9907916 B1 20110726; CA 2320865 A1 20000622; CA 2320865 C 20100316; CN 1221687 C 20051005; CN 1293720 A 20010502; KR 100400522 B1 20031010; WO 0036191 A1 20000622

INPADOC legal status


2008-01-02 [17Q] FIRST EXAMINATION REPORT

- Effective date: 20071128

2006-06-21 [A4] SUPPLEMENTARY SEARCH REPORT

- Effective date: 20060519

2004-05-19 [RBV] DESIGNATED CONTRACTING STATES (CORRECTION):

- Designated State(s): DE FR GB

2001-02-07 [17P] REQUEST FOR EXAMINATION FILED

- Effective date: 20000810

2001-02-07 [AK] DESIGNATED CONTRACTING STATES:

- Kind Code of Ref Document: A1

- Designated State(s): AT BE CH CY DE DK ES FI FR GB GR IE IT LI LU MC NL PT SE