EP 1074640 A1 20010207 - 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
Application
Priority
- JP 9907124 W 19991217
- JP 35925498 A 19981217
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
IPC 8 full level
C25D 11/36 (2006.01)
CPC (source: EP KR)
C25D 11/36 (2013.01 - EP KR)
Designated contracting state (EPC)
DE FR GB
DOCDB simple family (publication)
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; KR 20010040816 A 20010515; WO 0036191 A1 20000622
DOCDB simple family (application)
EP 99959898 A 19991217; BR 9907916 A 19991217; CA 2320865 A 19991217; CN 99804171 A 19991217; JP 9907124 W 19991217; KR 20007008710 A 20000809