EP 4121580 A1 20230125 - METHOD FOR GENERATING A PHOSPHATE CONVERSION COATING AND NICKEL-FREE PHOSPHATING SOLUTION
Title (en)
METHOD FOR GENERATING A PHOSPHATE CONVERSION COATING AND NICKEL-FREE PHOSPHATING SOLUTION
Title (de)
VERFAHREN ZUM ERZEUGEN EINER PHOSPHATIERSCHICHT UND NICKELFREIE PHOSPHATIERLÖSUNG
Title (fr)
PROCÉDÉ DE GÉNÉRATION D'UN REVÊTEMENT DE CONVERSION DE PHOSPHATE ET SOLUTION DE PHOSPHATATION EXEMPTE DE NICKEL
Publication
Application
Priority
EP 2020057635 W 20200319
Abstract (en)
[origin: WO2021185449A1] The invention provides a method for generating a phosphate conversion coating on a surface of a steel flat product provided with a metallic protective coating, the polluting effect of which method is minimized. To this end, according to the invention, a nickel-free aqueous phosphating solution is applied to the metallic protective coating, which solution contains 0.1 - 10 g/l phosphoric acid, 0.5 - 15 g/l of a zinc salt, 1 - 100 g/l of an alkaline earth metal salt, and 0.5 - 25 g/l of a monovalent or polyvalent organic carboxylic acid comprising 1-8 carbon atoms or a salt of said carboxylic acid and optionally at least one additive selected from the group of surfactants and iron salts, in contents of up to 10 g/l each.
IPC 8 full level
C23C 22/22 (2006.01); C23C 22/80 (2006.01)
CPC (source: EP)
C23C 22/22 (2013.01); C23C 22/80 (2013.01)
Citation (search report)
See references of WO 2021185449A1
Designated contracting state (EPC)
AL AT BE BG CH CY CZ DE DK EE ES FI FR GB GR HR HU IE IS IT LI LT LU LV MC MK MT NL NO PL PT RO RS SE SI SK SM TR
Designated extension state (EPC)
BA ME
Designated validation state (EPC)
KH MA MD TN
DOCDB simple family (publication)
DOCDB simple family (application)
EP 2020057635 W 20200319; EP 20713264 A 20200319