EP 0215041 B1 19880817 - PROCESS FOR THE PHOSPHATING OF METAL SURFACES
Title (en)
PROCESS FOR THE PHOSPHATING OF METAL SURFACES
Publication
Application
Priority
ES 541129 A 19850222
Abstract (en)
[origin: WO8604931A1] Process for the phosphating of metal surfaces, particularly iron and steel, with aqueous, acid phosphating solutions. Along with zinc and phosphate ions, the solutions contain an activator combination of alkali metal bromate and m-nitrobenzolsulphonate. This new process is particularly well suited for the pretreatment of metal surfaces prior to cathodic electrobath lacquering. The acid phosphating solutions meet the following conditions: a) zinc content 1,2 to 2 g/l; b) bromate content 0.5 to 1 g/l; c) m-nitrobenzolsulphonate 0.2 to 0.5 g/l; d) weight ratio phosphate: zinc = (7 to 20) : 1; e) weight ratio phosphate : bromate = (14 to 48) : 1; f) weight ratio zinc : bromate = (1.2 to 4) : 1; g) weight ratio bromate : m-nitrobenzolsulphonate = (1 to 5) : 1; h) number of points total acid 18 to 25; i) number of points free acid 0.5 to 1; g) temperature 35 to 40<o>C.
IPC 1-7
IPC 8 full level
C23C 22/12 (2006.01); C23C 22/17 (2006.01); C23C 22/18 (2006.01)
CPC (source: EP US)
C23C 22/17 (2013.01 - EP US); C23C 22/184 (2013.01 - EP US)
Designated contracting state (EPC)
BE DE FR GB IT NL SE
DOCDB simple family (publication)
WO 8604931 A1 19860828; BR 8605484 A 19870422; DE 3660553 D1 19880922; EP 0215041 A1 19870325; EP 0215041 B1 19880817; ES 541129 A0 19860401; ES 8606528 A1 19860401; JP S62501919 A 19870730; PL 254554 A1 19860826; SU 1560060 A3 19900423; US 4708744 A 19871124
DOCDB simple family (application)
EP 8600084 W 19860220; BR 8605484 A 19860220; DE 3660553 T 19860220; EP 86901388 A 19860220; ES 541129 A 19850222; JP 50142786 A 19860220; PL 25455485 A 19850715; SU 4028345 A 19861021; US 83292386 A 19860224