EP 0324395 B1 19921216 - PROCESS FOR PHOSPHATIZING METAL SURFACES
Title (en)
PROCESS FOR PHOSPHATIZING METAL SURFACES
Publication
Application
Priority
DE 3800835 A 19880114
Abstract (en)
[origin: US4944813A] The present invention relates to a process for phosphating metal surfaces, and more specifically of surfaces of iron, zinc, and aluminum and the alloys thereof as a pretreatment for cold working wherein the surfaces without previous activation are contacted in a temperature range of from 30 DEG C. to 70 DEG C. with an aqueous solution containing (a) from 10 to 40 g/l of Ca2+ ions, (b) from 10 to 40 g/l of Zn2+ ions, (c) from 10 to 100 g/l of OP43- ions and, as accelerator, (d) from 10 to 100 g/l of NO3- ions and/or (e) from 0.1 to 2.0 g/l of organic nitro compounds, said solution exhibiting a pH value in the range of from 2.0 to 3.8 and a ratio of free acid to total acid of from 1:4 to 1:100.
IPC 1-7
IPC 8 full level
C23C 22/12 (2006.01); C23C 22/13 (2006.01); C23C 22/22 (2006.01); C23C 22/36 (2006.01)
CPC (source: EP US)
C23C 22/22 (2013.01 - EP US); C23C 22/367 (2013.01 - EP US)
Citation (examination)
EP 0045110 A1 19820203 - METALLGESELLSCHAFT AG [DE], et al
Designated contracting state (EPC)
AT BE DE ES FR GB GR IT NL SE
DOCDB simple family (publication)
EP 0324395 A1 19890719; EP 0324395 B1 19921216; AT E83509 T1 19930115; AU 2850889 A 19890720; AU 604395 B2 19901213; BR 8900148 A 19890912; DE 3800835 A1 19890727; DE 58902980 D1 19930128; JP H01219172 A 19890901; MX 169762 B 19930723; TR 26644 A 19940525; US 4944813 A 19900731
DOCDB simple family (application)
EP 89100228 A 19890107; AT 89100228 T 19890107; AU 2850889 A 19890113; BR 8900148 A 19890113; DE 3800835 A 19880114; DE 58902980 T 19890107; JP 962189 A 19890117; MX 1453189 A 19890113; TR 4589 A 19890112; US 29715589 A 19890113