Conversion coatings on aluminium from sprayed KF solutions

The invention is a method of forming a conversion coating on an aluminium surface. According to the method, the aluminium surface is conversion coated by first treating the surface by thermal degreasing or aqueous alkaline degreasing and then spraying the treated surface with an aqueous solution of...

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Bibliographische Detailangaben
Hauptverfasser:	ZALUZEC, MATTHEW JOHN, LAZARZ, KIMBERLEY ANN, VAN EVANS, TIMOTHY
Format:	Patent
Sprache:	eng ; fre ; ger
Schlagworte:	CHEMICAL SURFACE TREATMENT CHEMISTRY CLADDING OR PLATING BY SOLDERING OR WELDING 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 MATERIAL WITH METALLIC MATERIAL COATING METALLIC MATERIAL CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING DIFFUSION TREATMENT OF METALLIC MATERIAL INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION INGENERAL MACHINE TOOLS METAL-WORKING NOT OTHERWISE PROVIDED FOR METALLURGY PERFORMING OPERATIONS SOLDERING OR UNSOLDERING SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THESURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTION TRANSPORTING WELDING WORKING BY LASER BEAM
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Beschreibung
Zusammenfassung:	The invention is a method of forming a conversion coating on an aluminium surface. According to the method, the aluminium surface is conversion coated by first treating the surface by thermal degreasing or aqueous alkaline degreasing and then spraying the treated surface with an aqueous solution of KF. The concentration of KF in the solution is 0.5-15.0 wt. % and the temperature is 90-212 DEG F. The solution is sprayed on the aluminium surface for at least 5 seconds at a pressure of 5-50 psi. The conversion coating formed on the aluminium surface consists essentially of: (a) substantially all K3AlF6 or (b) a mixture comprising a major proportion of K3AlF6 and a minor proportion of KAlF4