Method of forming hard, abrasionresistant coatings on aluminum and aluminum alloys
First Claim
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1. A METHOD OF PRODUCING A HARD, ABRASION-RESISTANT ANODIC COATING ON THE SURFACE OF A PREDOMINANTLY ALUMINUM OR ALUMINUM ALLOY ARTICLE BY MAKING THE ARTICLE TO BE COATED AN ANODE IN AN ELECTROLYTIC CELL CONTAINING AN AQUEOUS ACIDIC COATING-FORMING ELECTROLYTE COMPRISING PREDOMINANTLY AN AQUEOUS SOLUTION OF SULFURIC ACID AND PASSING AN ELECTRIC CURRENT THROUGH THE ELECTROLYTIC CELL, INCLUDING THE ANODE, WHILE MAINTAINING THE ELECTROLYTE AT A TEMPERATURE BELOW 35* F. DURING THE ENTIRE COATING OPERATION.
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1 Claim
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1. A METHOD OF PRODUCING A HARD, ABRASION-RESISTANT ANODIC COATING ON THE SURFACE OF A PREDOMINANTLY ALUMINUM OR ALUMINUM ALLOY ARTICLE BY MAKING THE ARTICLE TO BE COATED AN ANODE IN AN ELECTROLYTIC CELL CONTAINING AN AQUEOUS ACIDIC COATING-FORMING ELECTROLYTE COMPRISING PREDOMINANTLY AN AQUEOUS SOLUTION OF SULFURIC ACID AND PASSING AN ELECTRIC CURRENT THROUGH THE ELECTROLYTIC CELL, INCLUDING THE ANODE, WHILE MAINTAINING THE ELECTROLYTE AT A TEMPERATURE BELOW 35* F. DURING THE ENTIRE COATING OPERATION.
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Current AssigneeCharles F. Burrows
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Original AssigneeCharles F. Burrows
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InventorsBurrows, Charles F.
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Application NumberUS03/157,640Time in Patent Office1,648 DaysField of SearchUS Class Current205/148CPC Class CodesC25D 11/08 containing inorganic acids
