Process and composition for coating aluminum surfaces
First Claim
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1. IN THE ART OF PRODUCING A CHROMATE CONVERSION COATING ON SURFACES OF ALUMINUM AND ALLOYS THEREOF IN WHICH ALIUMINUM IS THE PREDOMINANT INGREDIENT BY TREATING THE SURFACE WITH AN AQUEOUS ACID BATH OF THE TYPE WHICH CONSISTS ESSENTIALLY OF HEXAVALENT CHROMIUM AND FLUORINE IN PROPORTIONS CAPABLE OF PRODUCING SUCH A COATING;
- THE METHOD WHICH COMPRISES INCLUDING IN THE BATH, AS AN ADDITION AGENT, METAL IONS FROM THE GROUP CONSISTING OF ZIRCONIUM, TITANIUM AND STANNIC TIN IN A QUANTITY SUFFICIENT TO ENHANCE THE CORROSION RESISTANCE OF THE COATED SURFACE AND THEN TREATING THE SURFACE WITH SUCH BATH.
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1 Claim
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1. IN THE ART OF PRODUCING A CHROMATE CONVERSION COATING ON SURFACES OF ALUMINUM AND ALLOYS THEREOF IN WHICH ALIUMINUM IS THE PREDOMINANT INGREDIENT BY TREATING THE SURFACE WITH AN AQUEOUS ACID BATH OF THE TYPE WHICH CONSISTS ESSENTIALLY OF HEXAVALENT CHROMIUM AND FLUORINE IN PROPORTIONS CAPABLE OF PRODUCING SUCH A COATING;
- THE METHOD WHICH COMPRISES INCLUDING IN THE BATH, AS AN ADDITION AGENT, METAL IONS FROM THE GROUP CONSISTING OF ZIRCONIUM, TITANIUM AND STANNIC TIN IN A QUANTITY SUFFICIENT TO ENHANCE THE CORROSION RESISTANCE OF THE COATED SURFACE AND THEN TREATING THE SURFACE WITH SUCH BATH.
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Current AssigneeNewhard Jr Nelson James, Spruance Jr Frank Palin
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Original AssigneeNewhard Jr Nelson James, Spruance Jr Frank Palin
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InventorsSPRUANCE JR FRANK PALIN, NEWHARD JR NELSON JAMES
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Application NumberUS03/280,364Time in Patent Office2,350 DaysField of SearchUS Class Current148/268CPC Class CodesC23C 22/37 containing also hexavalent ...C23C 22/38 containing also phosphates
