Electrolytic graining of aluminium in nitric acid and oxalic...

Details Electrolytic graining of aluminium in nitric acid and oxalic... Electrolytic graining of aluminium in nitric acid and oxalic...

C - Chemistry, Metallurgy

25

F

204/11.5, 204/86

C25F 3/04 (2006.01) B41N 3/03 (2006.01)

Patent

CA 1224181

ABSTRACT OF THE DISCLOSURE This invention relates to a process for the electrolytic graining of a material in the form of a sheet, a foil or a strip, comprising aluminum or an alloy thereof, in an aqueous electrolyte containing nitric acid and, as an additive, oxalic acid. Further additives which may optionally be contained in the electrolyte comprise boric acid, aluminum nitrate and/or hydrogen peroxide. The material which has been roughened according to the inventive process is preferably used as a support material for lithographic printing plates carrying a photosensitive coating. The roughened surface may additionally be sub- jected to an anodic oxidation treatment.

421763

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