EP 4065748 A1 20221005 - RESOURCE-SAVING METHOD FOR ACTIVATING A METAL SURFACE PRIOR TO A PHOSPHATIZATION PROCESS
Title (en)
RESOURCE-SAVING METHOD FOR ACTIVATING A METAL SURFACE PRIOR TO A PHOSPHATIZATION PROCESS
Title (de)
RESSOURCENSCHONENDES VERFAHREN ZUR AKTIVIERUNG EINER METALLOBERFLÄCHE VOR EINER PHOSPHATIERUNG
Title (fr)
PROCÉDÉ D'ÉCONOMIE DE RESSOURCES POUR ACTIVER UNE SURFACE MÉTALLIQUE AVANT UN PROCESSUS DE PHOSPHATATION
Publication
Application
Priority
- EP 19211410 A 20191126
- EP 2020082608 W 20201119
Abstract (en)
[origin: WO2021104973A1] The invention relates to a method for phosphatizing metal surfaces in a layer-forming manner using a colloidal aqueous solution as an activation stage, containing a dispersed particulate constituent, wherein in addition to dispersed inorganic compounds of phosphates of polyvalent metal cations, the particulate constituent contains polymeric organic compounds as dispersants, which are composed at least partly of styrene and/or an α-olefin with no more than 5 carbon atoms and at least partly of maleic acid and/or the anhydride and/or the imide thereof, and the polymeric organic compounds additionally comprise polyoxyalkylene units. In the activation stage of the method according to the invention, the addition of condensed phosphates can be omitted such that the content of dissolved condensed phosphates in the colloidal aqueous solution is less than 0.25 based the phosphate content in the particulate constituent of the solution, in each case with respect to the element P.
IPC 8 full level
C23C 22/36 (2006.01); C23C 22/78 (2006.01)
CPC (source: EP KR US)
C23C 22/12 (2013.01 - US); C23C 22/184 (2013.01 - US); C23C 22/22 (2013.01 - US); C23C 22/362 (2013.01 - EP KR); C23C 22/73 (2013.01 - EP KR); C23C 22/78 (2013.01 - EP 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
DOCDB simple family (publication)
EP 3828306 A1 20210602; CN 114761618 A 20220715; CN 114761618 B 20240319; EP 4065748 A1 20221005; JP 2023503493 A 20230130; KR 20220106124 A 20220728; MX 2022006240 A 20220622; US 2022290303 A1 20220915; WO 2021104973 A1 20210603
DOCDB simple family (application)
EP 19211410 A 20191126; CN 202080081518 A 20201119; EP 2020082608 W 20201119; EP 20807401 A 20201119; JP 2022531053 A 20201119; KR 20227017347 A 20201119; MX 2022006240 A 20201119; US 202217664701 A 20220524