EP 0039093 B1 19831116 - METHOD OF PHOSPHATING THE SURFACES OF METALS, AND ITS USE
Title (en)
METHOD OF PHOSPHATING THE SURFACES OF METALS, AND ITS USE
Publication
Application
Priority
DE 3016576 A 19800430
Abstract (en)
[origin: EP0039093A1] Phosphate coatings are formed on metal surfaces e.g. sheet steel by use of a zinc phosphate composition having a low ratio Zn:P2O5 but containing relatively high contacts of CIO3 and NO3. The process results in coatings having a fine grain and high wet corrosion resistance and which are particularly suitable for immersion electro-lacquering. Solutions contain (in g/l) 0.3-1.3 Zn, 10-26 P2O5, 0.1-3 Ni, 1-6 CIO3 and 5-25 NO3. The ratio of P2O5/Zn is in the range 9-85 and the ratio of Ni/Zn in the range 0-1.5. Solutions may also include sodium nitrite or nitrobenzene sulphonate, BF<->4 or SiF<2->6 and small amounts (e.g. up to 0.5 g/l) of other cations e.g. NH<+>4, Ca, Mn, Cu, Co.
IPC 1-7
IPC 8 full level
C23C 22/14 (2006.01); C23C 22/36 (2006.01)
CPC (source: EP)
C23C 22/14 (2013.01); C23C 22/362 (2013.01)
Designated contracting state (EPC)
AT BE CH DE FR LI NL SE
DOCDB simple family (publication)
EP 0039093 A1 19811104; EP 0039093 B1 19831116; AT E5332 T1 19831215; BR 8102619 A 19820119; DE 3016576 A1 19811105; DE 3161398 D1 19831222; ES 501701 A0 19820916; ES 8207233 A1 19820916; GB 2074611 A 19811104; GB 2074611 B 19841003; IT 1207959 B 19890601; IT 8121425 A0 19810429; PT 72944 A 19810501; PT 72944 B 19820326
DOCDB simple family (application)
EP 81200286 A 19810313; AT 81200286 T 19810313; BR 8102619 A 19810429; DE 3016576 A 19800430; DE 3161398 T 19810313; ES 501701 A 19810428; GB 8113014 A 19810428; IT 2142581 A 19810429; PT 7294481 A 19810429