Film forming compositions containing molybdate derived coatings

Coated metal particles 10 comprise a coating 14 derived from a molybdate solution that is reactive to the uncoated metal. Typically, the metal is aluminium or aluminium alloy. Preferably, the coating comprises a molybdate oxide and is electrically conductive or semiconductive, with a thickness of 1...

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Bibliographische Detailangaben
Hauptverfasser:	Kent Boomer, Ryan Merritt
Format:	Patent
Sprache:	eng
Schlagworte:	ADHESIVES CASTING CHEMICAL PAINT OR INK REMOVERS CHEMISTRY COATING COMPOSITIONS, e.g. PAINTS, VARNISHES ORLACQUERS CORRECTING FLUIDS DYES FILLING PASTES INKS MAKING METALLIC POWDER MANUFACTURE OF ARTICLES FROM METALLIC POWDER METALLURGY MISCELLANEOUS APPLICATIONS OF MATERIALS MISCELLANEOUS COMPOSITIONS NATURAL RESINS PAINTS PASTES OR SOLIDS FOR COLOURING OR PRINTING PERFORMING OPERATIONS POLISHES POWDER METALLURGY TRANSPORTING USE OF MATERIALS THEREFOR WOODSTAINS WORKING METALLIC POWDER
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Beschreibung
Zusammenfassung:	Coated metal particles 10 comprise a coating 14 derived from a molybdate solution that is reactive to the uncoated metal. Typically, the metal is aluminium or aluminium alloy. Preferably, the coating comprises a molybdate oxide and is electrically conductive or semiconductive, with a thickness of 1 nm to 5 microns. The coating is normally free from chromium and/or lithium. The molybdate solution may comprise potassium molybdate with potassium permanganate and/or potassium hexafluorozirconate. The solution may be aqueous with a pH of 2-4 or 9-11. A corrosion-resistant composition comprising the coated metal particles and a binder is also disclosed, wherein the composition is suitable for application onto a metal substrate. The composition may comprise an ionic or organic corrosion inhibitor, which is lithium-free and may comprise synergistic combinations of metal oxalates, metal pirates, metal succinates, metal tartrates, and metal adipates. A method of manufacturing the coated particles is further claimed.