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US 4,374,710 AGranted
Electrolytic graining of aluminum with nitric and oxalic acids
AssigneeAmerican Hoechst Corporation
InventorJohn E. Walls
Life of this patent
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Abstract
Aluminum is electrolytically grained in an aqueous solution of nitric and oxalic acids to provide a surface structure suitable for use as part of a lithographic printing plate. The electrolyte may also optionally contain boric acid and/or aluminum nitrate and/or hydrogen peroxide.
Claims13
A method of treating the surface of a sheet of aluminum or the alloys thereof which comprises electrolytically graining said sheet under electrolyzing conditions in an aqueous solution of nitric acid and oxalic acid in a sufficient concentration and for a sufficient length of time to provide a finely grained surface topography to said sheet.
Dependencies are inferred from the claim text.