EP 3443147 A1 20190220 - SUPPRESSION OF PHOSPHATE DRAGGING RESULTING FROM THE PLANT DESIGN IN A DIP COATING PROCESS SEQUENCE
Title (en)
SUPPRESSION OF PHOSPHATE DRAGGING RESULTING FROM THE PLANT DESIGN IN A DIP COATING PROCESS SEQUENCE
Title (de)
UNTERDRÜCKUNG ANLAGENBEDINGTER PHOSPHATÜBERSCHLEPPUNG IN EINER PROZESSFOLGE ZUR TAUCHLACKIERUNG
Title (fr)
INHIBITION DU TRANSPORT DE PHOSPHATES LIÉ AU DÉPÔT DANS UNE SUITE D'OPÉRATIONS JUSQU'AU LAQUAGE PAR IMMERSION
Publication
Application
Priority
- DE 102016206418 A 20160415
- EP 2017058995 W 20170413
Abstract (en)
[origin: WO2017178619A1] The present invention relates to a method for the preliminary treatment against corrosion of a plurality of metallic components, in which dragging of water-soluble phosphates from an acid passivation process using water-dissolved phosphates as the active components, and which can be, in particular, a phosphating process, into the dip coating treatment stage, is effectively prevented. In the method according to the invention, a component is conveyed by a conveyor frame through all the treatment stages of the preliminary treatment line, and the conveyance pair consisting of the component and of the conveyor frame is only separated after dip coating for transferring the pre-treated component to the firing stage, releasing the conveyor frame to receive again a component to be pre-treated. In the process according to the invention, the transport pair consisting of the component and the conveyor frame passes before dip coating and immediately after acid passivation through an intermediate treatment stage, wherein at least the part of the conveyor frame having been previously brought into contact with the aqueous treatment solution containing water-soluble phosphates during acid passivation, is then brought into contact with an acid aqueous medium containing a total amount of at least 0.1 g/kg, relative to the medium, of water-soluble compounds of the elements Zr, Ti, Cr(III) and/or Al.
IPC 8 full level
C25D 13/20 (2006.01); C09D 5/44 (2006.01); C23C 22/07 (2006.01); C23C 22/73 (2006.01); C23C 22/83 (2006.01)
CPC (source: EP US)
C09D 5/4488 (2013.01 - US); C23C 22/07 (2013.01 - US); C23C 22/73 (2013.01 - EP US); C23C 28/04 (2013.01 - US); C25D 13/02 (2013.01 - US); C25D 13/04 (2013.01 - US); C25D 13/20 (2013.01 - EP US); C25D 13/22 (2013.01 - US); C23C 2222/10 (2013.01 - EP US)
Citation (search report)
See references of WO 2017178619A1
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)
WO 2017178619 A1 20171019; CN 108779572 A 20181109; DE 102016206418 A1 20171019; EP 3443147 A1 20190220; MX 2018010249 A 20180927; US 2019032224 A1 20190131
DOCDB simple family (application)
EP 2017058995 W 20170413; CN 201780016614 A 20170413; DE 102016206418 A 20160415; EP 17719525 A 20170413; MX 2018010249 A 20170413; US 201816149502 A 20181002