A chromium-free water based coating for treating a Galvannealed or galvanized steel surface

A chromium free water based coating is developed for treating Galvannealed or galvanized steel surface. The coating is based upon hybrid condensation product of water soluble sol-gel solution prepared from solution containing one or more organofunctional silanes. The said silane solution is hydrolis...

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Bibliographische Detailangaben
Hauptverfasser:	BHAVE, KEDAR SHASHIKANT, PAIS, RAJESH SHYAM, GUIN, AKSHAY KUMAR, BHADU, MANISH KUMAR, SINHABABU, MOHUA RANI
Format:	Patent
Sprache:	eng
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 COMPOSITIONS OF MACROMOLECULAR COMPOUNDS CORRECTING FLUIDS DIFFUSION TREATMENT OF METALLIC MATERIAL DYES FILLING PASTES INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION INGENERAL INKS MACROMOLECULAR COMPOUNDS OBTAINED OTHERWISE THAN BY REACTIONSONLY INVOLVING UNSATURATED CARBON-TO-CARBON BONDS 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 MATERIALS THEREFOR WOODSTAINS
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Beschreibung
Zusammenfassung:	A chromium free water based coating is developed for treating Galvannealed or galvanized steel surface. The coating is based upon hybrid condensation product of water soluble sol-gel solution prepared from solution containing one or more organofunctional silanes. The said silane solution is hydrolised at pH 4-6.5 for 16 hours at room temperature with continuous stirring at a speed of 300-800 rpm. The coating composition when applied on a galvanized and galvannealed steel substrate provides more than 200 hours of white rust resistance at a coating thickness of less than 5 micron and can dry within 10-30 sec at 80-90 deg C peak metal temperature.