IMPROVED CR(III)-BASED PASSIVATION FOR ZINC-ALUMINUM COATED STEEL

The present application is directed to an aqueous passivation composition for the treatment of zinc or zinc alloy coatings, said composition having a pH of from 6.5 to 9 and comprising, based on the weight of the composition: a) at least one base polymer selected from acrylic polymers and non-ionic...

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Bibliographische Detailangaben
Hauptverfasser:	VIJAY, Meenu, JADHAV, Aditi, DAS, Niranjan, WAGH, Komal
Format:	Patent
Sprache:	eng ; fre ; ger
Schlagworte:	ADHESIVES 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 COMPOSITIONS BASED THEREON CORRECTING FLUIDS DIFFUSION TREATMENT OF METALLIC MATERIAL DYES FILLING PASTES INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION INGENERAL INKS METALLURGY MISCELLANEOUS APPLICATIONS OF MATERIALS MISCELLANEOUS COMPOSITIONS NATURAL RESINS ORGANIC MACROMOLECULAR COMPOUNDS PAINTS PASTES OR SOLIDS FOR COLOURING OR PRINTING POLISHES SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THESURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTION THEIR PREPARATION OR CHEMICAL WORKING-UP USE OF INORGANIC OR NON-MACROMOLECULAR ORGANIC SUBSTANCES ASCOMPOUNDING INGREDIENTS USE OF MATERIALS THEREFOR WOODSTAINS
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Beschreibung
Zusammenfassung:	The present application is directed to an aqueous passivation composition for the treatment of zinc or zinc alloy coatings, said composition having a pH of from 6.5 to 9 and comprising, based on the weight of the composition: a) at least one base polymer selected from acrylic polymers and non-ionic polyurethane polymers present in an amount of from 5 to 60 wt. % of; b) trivalent Cr(III) ions, present in an amount of from 0.1 to 2.5 wt. %, calculated as Cr; c) ascorbic acid; d) at least one aluminum compound present in an amount of from 0.1 to 2.5 wt. %; and, e) at least one finely divided wax present in the composition in an amount of up to 10 wt. %; wherein said composition is substantially free of nitrate anions and is substantially free of hexavalent chromium (Cr(VI)).