EP 0269138 B1 19901128 - PROCESS FOR PRODUCING PHOSPHATE COATINGS ON METALS
Title (en)
PROCESS FOR PRODUCING PHOSPHATE COATINGS ON METALS
Publication
Application
Priority
DE 3636390 A 19861025
Abstract (en)
[origin: US4824490A] Disclosed is a process of producing a phosphate coating on a metal having a surface which consists at least in part of iron or steel. The metal is contacted at a temperature in the range from 30 DEG to 50 DEG C. with a phosphatizing solution which contains 5 to 25 g/l zinc, 1 to 10 g/l manganese, 0.1 to 13 g/l iron(II), 5 to 40 g/l phosphate (calculated as P2O5), 5 to 50 g/l nitrate, and which also contains 0.5 to 5 g/l fluoroborate (calculated as BF4), and 0.05 to 3 g/l tartaric acid and/or citric acid. The solution has been adjusted to weight ratios of Zn:P2O5=(0.5 to 3):1 and of Mn:Zn=(0.04 to 0.5):1 and to a ratio of free acid to total acid of (0.04 to 0.2):1. It is preferred to add nickel, copper and/or calcium to the phosphatizing solution and to adjust it to a content of Fe(II) not in excess of 10 g/l. The process is particularly suitable for preparing metals for cold working.
IPC 1-7
IPC 8 full level
C23C 22/13 (2006.01); C23C 22/18 (2006.01); C23C 22/36 (2006.01)
CPC (source: EP US)
C23C 22/364 (2013.01 - EP US)
Designated contracting state (EPC)
BE DE ES FR IT NL SE
DOCDB simple family (publication)
EP 0269138 A1 19880601; EP 0269138 B1 19901128; AU 8003887 A 19880428; BR 8705698 A 19880531; CA 1308629 C 19921013; DE 3636390 A1 19880428; DE 3766477 D1 19910110; ES 2018535 B3 19910416; GB 2203453 A 19881019; GB 2203453 B 19901205; GB 8725035 D0 19871202; JP 2700061 B2 19980119; JP S63190178 A 19880805; US 4824490 A 19890425; ZA 877980 B 19890628
DOCDB simple family (application)
EP 87201890 A 19871003; AU 8003887 A 19871022; BR 8705698 A 19871023; CA 548749 A 19871007; DE 3636390 A 19861025; DE 3766477 T 19871003; ES 87201890 T 19871003; GB 8725035 A 19871026; JP 26406787 A 19871021; US 11094987 A 19871020; ZA 877980 A 19871023