EP 0363200 A2 19900411 - Improvement of zinc phosphate treatment for cold working.
Title (en)
Improvement of zinc phosphate treatment for cold working.
Title (de)
Zinkphosphatbehandlung vor der Kaltverformung.
Title (fr)
Traitement amélioré au phosphate de zinc avant le travail à froid.
Publication
Application
Priority
JP 25243588 A 19881006
Abstract (en)
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)
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