Method of treating tin plate
First Claim
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1. IN A METHOD OF TREATING SHEET MATERIAL HAVING A TIN SURFACE, TO INHIBIT THE TENDENCY THEREOF TO SULPHIDE STAINING AND BAKING DISCOLORATION AND INCREASE THE ADHERENCE OF LACQUER, THE STEPS INCLUDING FIRST MAKING THE MATERIAL CATHODE IN AN ACID SOLUTION CONTAINING FROM 2 TO 3% OF A CHROMATE OF AN ALKALI METAL AND HAVING A PH VALUE OF FROM 2 TO 7, THEREBY AT LEAST PARTIALLY REDUCING THE OXIDE FILM INITIALLY EXISTING ON THE MATERIAL, AND IMMEDIATELY THEREAFTER MAKING THE MATERIAL ANODE WHILE STILL IN SAID SOLUTION, THEREBY RE-OXIDIZING THE TIN SURFACE AND FORMING THEREON A WATER-INSOLUBLE PROTECTIVE FILM OF A COMPLEX COMBINATION OF THE OXIDE AND SAID CHROMATE.
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1 Claim
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1. IN A METHOD OF TREATING SHEET MATERIAL HAVING A TIN SURFACE, TO INHIBIT THE TENDENCY THEREOF TO SULPHIDE STAINING AND BAKING DISCOLORATION AND INCREASE THE ADHERENCE OF LACQUER, THE STEPS INCLUDING FIRST MAKING THE MATERIAL CATHODE IN AN ACID SOLUTION CONTAINING FROM 2 TO 3% OF A CHROMATE OF AN ALKALI METAL AND HAVING A PH VALUE OF FROM 2 TO 7, THEREBY AT LEAST PARTIALLY REDUCING THE OXIDE FILM INITIALLY EXISTING ON THE MATERIAL, AND IMMEDIATELY THEREAFTER MAKING THE MATERIAL ANODE WHILE STILL IN SAID SOLUTION, THEREBY RE-OXIDIZING THE TIN SURFACE AND FORMING THEREON A WATER-INSOLUBLE PROTECTIVE FILM OF A COMPLEX COMBINATION OF THE OXIDE AND SAID CHROMATE.
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Current AssigneeRichard A. Neish
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Original AssigneeRichard A. Neish
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InventorsNeish, Richard A.
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Application NumberUS03/056,843Time in Patent Office1,385 DaysField of SearchUS Class Current205/219CPC Class CodesC25D 11/38 Chromatising
