EP 0363200 A3 19900718 - IMPROVEMENT OF ZINC PHOSPHATE TREATMENT FOR COLD WORKING
Title (en)
IMPROVEMENT OF ZINC PHOSPHATE TREATMENT FOR COLD WORKING
Publication
Application
Priority
JP 25243588 A 19881006
Abstract (en)
[origin: EP0363200A2] The present invention provides a zinc phosphating method for cold working which hardly produces sludge and can be carried out in a short period of time. The method comprises treating a steel material with a surface conditioning solution comprising 1 to 20 ppm of titanium ion and having a pH of 8 to 11, and then treating it with a chemical solution comprising zinc ion in a concentration of 1 to 20 g/l, phosphate ion in a concentration of at least 5 g/l, nitrate ion in a concentration sufficient to have a concentration ratio of phosphate ion / nitrate ion of at least 1/3, pyrophosphate or tripolyphosphate ion in a concentration of 0.2 to 2 g/l, Fe (II) ion in a concentration of 0.1 to 20 g/l and a material decomposing nitrite ion and not oxidizing the Fe (II) ion in a concentration of at least 0.05 g/l.
IPC 1-7
IPC 8 full level
C23C 22/12 (2006.01); C23C 22/13 (2006.01); C23C 22/23 (2006.01); C23C 22/78 (2006.01)
CPC (source: EP KR)
C23C 22/23 (2013.01 - EP KR)
Citation (search report)
- [Y] EP 0045110 A1 19820203 - METALLGESELLSCHAFT AG [DE], et al
- [Y] US 3671332 A 19720620 - RAUSCH WERNER, et al
- [A] US 3923554 A 19751202 - ZIEMBA VICTOR F
- [A] DE 1062082 B 19590723 - METALLGESELLSCHAFT AG
- [A] FR 2323776 A1 19770408 - PARKER STE CONTINENTALE [FR]
- [A] CHEMICAL ABSTRACTS, vol. 109, no. 26, December 1988, page 255, abstract no. 235087s, Columbus, Ohio, US; & JP-A-63 130 781 (NIPPON PAINT CO., LTD) 02-06-1988
Designated contracting state (EPC)
DE FR GB
DOCDB simple family (publication)
EP 0363200 A2 19900411; EP 0363200 A3 19900718; JP H02101174 A 19900412; KR 900006033 A 19900507
DOCDB simple family (application)
EP 89310196 A 19891005; JP 25243588 A 19881006; KR 890014407 A 19891006