Process of coating aluminum
First Claim
2. IN A METHOD OF COATING ALUMINUM OR ALUMINUM ALLOY SURFACES TO FORM AN ADHERENT, CORROSION-RESISTANT COATING THEREON WITHOUT THE EVOLUTION OF GASESOUS HYDROGEN, THE STEP WHICH COMPRISES SUBJECTING THE SURFACE TO THE ACTION OF AN AQUEOUS COATING AGENT HAVING A PH OF LESS THAN 3 BUT SUFFICIENTLY HIGH NUMERICALLY TO AVOID THE EVOLUTION OF GASEOUS HYDROGEN AND CONSISTING ESSENTIALLY OF WATER, AN AMOUNT OF HYDROFLUORIC ACID STICHIOMETRICALLY EQUIVALENT TO 0.25 TO 11 GRAMS OF GASEOUS HYDROGEN FLUORIDE PER LITER OF SOLUTION, AND FROM 10 TO 350 GRAMS PER LITER OF AMMONIUM DICHROMATE, THE AMOUNT OF HYDROFLUORIC ACID BEING LOW WHEN THE AMOUNT OF AMMONIUM DICHROMATE IS LOW AND HIGH WHEN THE AMOUNT OF AMAMMONIUM DICHROMATE IS HIGH BUT WITHIN THE RANGES INDICATED.
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Accused Products
60 Citations
2 Claims
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2. IN A METHOD OF COATING ALUMINUM OR ALUMINUM ALLOY SURFACES TO FORM AN ADHERENT, CORROSION-RESISTANT COATING THEREON WITHOUT THE EVOLUTION OF GASESOUS HYDROGEN, THE STEP WHICH COMPRISES SUBJECTING THE SURFACE TO THE ACTION OF AN AQUEOUS COATING AGENT HAVING A PH OF LESS THAN 3 BUT SUFFICIENTLY HIGH NUMERICALLY TO AVOID THE EVOLUTION OF GASEOUS HYDROGEN AND CONSISTING ESSENTIALLY OF WATER, AN AMOUNT OF HYDROFLUORIC ACID STICHIOMETRICALLY EQUIVALENT TO 0.25 TO 11 GRAMS OF GASEOUS HYDROGEN FLUORIDE PER LITER OF SOLUTION, AND FROM 10 TO 350 GRAMS PER LITER OF AMMONIUM DICHROMATE, THE AMOUNT OF HYDROFLUORIC ACID BEING LOW WHEN THE AMOUNT OF AMMONIUM DICHROMATE IS LOW AND HIGH WHEN THE AMOUNT OF AMAMMONIUM DICHROMATE IS HIGH BUT WITHIN THE RANGES INDICATED.
Specification
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Current AssigneeMichael H. Bruno, Paul J. Hartsuch
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Original AssigneeMichael H. Bruno, Paul J. Hartsuch
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InventorsBruno, Michael H., Hartsuch, Paul J.
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Application NumberUS02/783,614Time in Patent Office927 DaysField of SearchUS Class Current148/264CPC Class CodesC23C 22/37 containing also hexavalent ...
