EP 0031103 B1 19830928 - METHOD FOR THE PRETREATMENT OF METAL SURFACES PRIOR TO PHOSPHATIZING
Title (en)
METHOD FOR THE PRETREATMENT OF METAL SURFACES PRIOR TO PHOSPHATIZING
Publication
Application
Priority
DE 2951600 A 19791221
Abstract (en)
[origin: US4384900A] This invention is directed to a method for treating metal surfaces. More particularly, this invention is directed to an improved method for cleaning, scouring, and activating metal surfaces prior to phosphatization, which comprises contacting said metal surfaces with an aqueous solution comprising primary and/or secondary alkali metal or ammonium salts of orthophosphates and conventional metal cleaning components, the solution having a pH value of from about 6.3 to 8.2, said pH being lower than the pH value of solutions of the corresponding secondary orthophosphates alone having the same concentration; and containing optionally condensed phosphates in an amount corresponding to the amount necessary to soften the water hardness of the water used.
IPC 1-7
IPC 8 full level
C23G 1/14 (2006.01); C23C 22/00 (2006.01); C23C 22/62 (2006.01); C23C 22/72 (2006.01); C23C 22/78 (2006.01); C23C 22/80 (2006.01); C23G 1/24 (2006.01)
CPC (source: EP US)
C23C 22/78 (2013.01 - EP US); C23C 22/80 (2013.01 - EP US)
Designated contracting state (EPC)
BE DE FR GB
DOCDB simple family (publication)
EP 0031103 A1 19810701; EP 0031103 B1 19830928; AT 372116 B 19830912; AT A620980 A 19830115; BR 8008327 A 19810707; CA 1151497 A 19830809; DE 2951600 A1 19810702; DE 3065089 D1 19831103; JP H028029 B2 19900222; JP S5693880 A 19810729; US 4384900 A 19830524
DOCDB simple family (application)
EP 80107866 A 19801212; AT 620980 A 19801219; BR 8008327 A 19801218; CA 367202 A 19801219; DE 2951600 A 19791221; DE 3065089 T 19801212; JP 17815180 A 19801218; US 21924580 A 19801222