Electrochemical graining of aluminum of aluminum alloy surfaces

C - Chemistry – Metallurgy – 25 – F

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204/20, 204/83.5

C25F 3/04 (2006.01) B41N 3/03 (2006.01) C25D 11/16 (2006.01) C25F 3/20 (2006.01) H05K 3/38 (2006.01) H05K 3/44 (2006.01)

Patent

CA 2018180

1 ELECTROCHEMICAL GRAINING OF ALUMINUM OR ALUMINUM ALLOY SURFACES ABSTRACT OF THE DISCLOSURE Aluminum or its alloys are electrochemically grained by using alternate current and an aqueous electrolyte comprising specific amounts of hydrochloric acid and an oxy-acid and/or a dicarboxylic acid, preferably lactic acid and/or succinic acid, respectively. Aluminum (or an alloy thereof) thus grained, can be coated with a photosensitive layer whereby forming a printing plate. Before coating it with the photosensitive layer, the plate can also be anodized by techniques well known to those skilled in the art.

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