Anodic oxidation of aluminum in phosphoric acid containing...

Details Anodic oxidation of aluminum in phosphoric acid containing... Anodic oxidation of aluminum in phosphoric acid containing...

C - Chemistry, Metallurgy

25

D

204/11.5, 204/24

C25D 11/08 (2006.01) B41N 3/03 (2006.01) C25D 11/04 (2006.01)

Patent

CA 1236421

ABSTRACT OF THE DISCLOSURE In the process for the anodic oxidation of mechanically, chemically and/or electrochemically roughened aluminum or of one of its alloys, an aqueous electrolyte, which is free from H2SO4 and contains H3PO4 and Al+3 ions is used. The process parameters are: an electrolyte content of 25 g/l to 500 g/l of H3PO4 and at least 5 g/l of Al+3 ions, a treatment time of 5 seconds to 500 seconds, a current density of 1 A/dm2 to 30 A/dm2 and a temperature of 35°C to 95°C. The Al+3 ion source in particular is a salt of aluminum having a phosphoroxo anion, such as AlPO4. The material prepared in accord- ance with this invention is preferably employed as a support material for offset printing plates which carry a radiation-sensitive layer.

478562

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