EP 4196625 A1 20230621 - RESOURCE-CONSERVING METHOD FOR ZINC PHOSPHATING A METAL SURFACE
Title (en)
RESOURCE-CONSERVING METHOD FOR ZINC PHOSPHATING A METAL SURFACE
Title (de)
RESSOURCENSCHONENDES VERFAHREN ZUR ZINKPHOSPHATIERUNG EINER METALLOBERFLÄCHE
Title (fr)
PROCÉDÉ DE CONSERVATION DE RESSOURCES POUR LA PHOSPHATATION AU ZINC D'UNE SURFACE MÉTALLIQUE
Publication
Application
Priority
- EP 20190493 A 20200811
- EP 2021067630 W 20210628
Abstract (en)
[origin: WO2022033759A1] The present invention relates to a method for layer-forming zinc phosphating of metal surfaces using a colloidal, aqueous solution as an activation stage, wherein a zinc phosphate layer having a layer weight of less than 2.0 g/m2 is deposited on the surfaces of zinc in the method step following the activation. The activation stage is based on a colloidal, aqueous solution containing a dispersed, particulate component, wherein the particulate component contains, in addition to dispersed inorganic compounds of phosphates of polyvalent metal cations, a polymeric organic compound as a dispersant which at least in part is composed of styrene and/or an α-olefin having no more than 5 carbon atoms, wherein the polymeric organic compound has additional units of maleic acid, the anhydride thereof and/or the imide thereof and the polymeric organic compound additionally has polyoxyalkylene units. In order to form closed zinc phosphate coatings which sufficiently protect against corrosion and which can be supplied to subsequent electrophoretic painting, it is necessary that the portion of particulate components of the colloidal, aqueous solution equals at least 4 g/kg in relation to the colloidal, aqueous solution.
IPC 8 full level
C23C 22/78 (2006.01); C23C 22/36 (2006.01); C23C 22/73 (2006.01)
CPC (source: EP KR US)
C23C 22/12 (2013.01 - KR); C23C 22/17 (2013.01 - US); C23C 22/362 (2013.01 - EP KR); C23C 22/73 (2013.01 - EP KR); C23C 22/78 (2013.01 - EP KR); C23F 11/173 (2013.01 - KR); C23F 11/188 (2013.01 - KR)
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)
EP 3954805 A1 20220216; CN 116034185 A 20230428; EP 4196625 A1 20230621; JP 2023538000 A 20230906; KR 20230050387 A 20230414; MX 2023001656 A 20230307; US 2023175138 A1 20230608; WO 2022033759 A1 20220217
DOCDB simple family (application)
EP 20190493 A 20200811; CN 202180056390 A 20210628; EP 2021067630 W 20210628; EP 21735717 A 20210628; JP 2023509851 A 20210628; KR 20237008121 A 20210628; MX 2023001656 A 20210628; US 202318165696 A 20230207