CONVEYOR FRAME TREATMENT FOR SUPPRESSING PHOSPHATE DRAGGING RESULTING FROM THE PLANT DESIGN IN A DIP COATING PROCESS SEQUENCE

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,...

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Bibliographische Detailangaben
Hauptverfasser:	PILAREK, Frank-Oliver, BROUWER, Jan-Willem, RESANO ARTALEJO, Fernando Jose
Format:	Patent
Sprache:	eng ; fre ; ger
Schlagworte:	ADHESIVES APPARATUS THEREFOR CHEMICAL PAINT OR INK REMOVERS CHEMICAL SURFACE TREATMENT CHEMISTRY COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATIONOR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY IONIMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL COATING COMPOSITIONS, e.g. PAINTS, VARNISHES ORLACQUERS COATING MATERIAL WITH METALLIC MATERIAL COATING METALLIC MATERIAL CORRECTING FLUIDS DIFFUSION TREATMENT OF METALLIC MATERIAL DYES ELECTROFORMING ELECTROLYTIC OR ELECTROPHORETIC PROCESSES FILLING PASTES INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION INGENERAL INKS METALLURGY MISCELLANEOUS APPLICATIONS OF MATERIALS MISCELLANEOUS COMPOSITIONS NATURAL RESINS PAINTS PASTES OR SOLIDS FOR COLOURING OR PRINTING POLISHES PROCESSES FOR THE ELECTROLYTIC OR ELECTROPHORETIC PRODUCTIONOF COATINGS SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THESURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTION USE OF MATERIALS THEREFOR WOODSTAINS
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Beschreibung
Zusammenfassung:	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, 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 during a special processing step for treating only the conveyor frame with an acid aqueous conditioning medium containing a total amount of at least 0.1 g/kg, relative to the medium, of water-soluble compounds of the elements iron, aluminium, calcium, magnesium, zinc, chromium(III), titanium and/or zirconium. This step is carried out according to the invention after the conveyance pair has been separated to transfer the pre-treated component to the baking stage, thus releasing the conveyor frame to receive again a component to be pre-treated.