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

1986-10-21

Tufariello, T. M.

Chemistry: electrical and wave energy

Processes and products

Electrostatic field or electrical discharge

20412995, C25F 304

Patent

active

046184058

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 inorganic electrolyte, at least one compound selected from the group consisting of condensed phosphoric acids, amidosulfonic acid, and the water-soluble alkali metal salts and ammonium salts thereof. In particular, the solution contains from 0.5 to 10% by weight of HCl and from 0.05 to 5.0% by weight of the additional inorganic electrolyte (for example, diphosphoric acid or polyphosphoric 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: 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.
Chemical Abstracts, vol. 93, Nr. 35852b, p. 618.
Chemical Abstracts, vol. 95, Nr. 143008f, p. 714.

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