Process for the electrochemical roughening of aluminum for use a

Details Process for the electrochemical roughening of aluminum for use a Process for the electrochemical roughening of aluminum for use a

1985-04-23

1986-07-15

Tufariello, T. M.

Chemistry: electrical and wave energy

Processes and products

Electrostatic field or electrical discharge

20412985, 20412995, C25F 304

Patent

active

046004823

ABSTRACT:
Disclosed is a process for electrochemically roughening aluminum or aluminum alloys for use as printing plate supports, in an aqueous mixed electrolyte solution containing hydrochloric acid (HCl) and, as an additional component, at least one haloalkanoic acid of the general formula Hal.sub.x H.sub.y-x C.sub.z --COOH, in which Hal stands for a halogen atom, z is an integer from 1 to 5, y=2z+1 and x is an integer from 1 to y. In particular, the solution contains from 0.5 to 10% by weight of HCl and from 0.1 to 8.0% by weight of haloalkanoic acid, for example, monochloracetic acid or trifluoroacetic acid. The support materials which are particularly uniformly roughened are employed in the production of offset-printing plates.

REFERENCES:
patent: 3755116 (1973-08-01), Terai et al.
patent: 3887447 (1975-06-01), Sheasby et al.
patent: 3899400 (1975-08-01), Patrie, et al.
patent: 4052275 (1977-10-01), Gumbinner et al.
patent: 4172772 (1979-10-01), Ould et al.
patent: 4339315 (1982-07-01), Kikuchi et al.
patent: 4367124 (1983-01-01), Kikuchi et al.
A. J. Dowell, "The Alternating Current Etching of Aluminium Lithographic Sheet", Transactions of the Institute of Metal Finishing, vol. 57, pp. 138-144, 1979.

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