C - Chemistry – Metallurgy – 25 – D
Patent
C - Chemistry, Metallurgy
25
D
204/11.5
C25D 11/04 (2006.01) B41N 3/03 (2006.01) C25D 11/06 (2006.01) C25D 11/12 (2006.01) C25F 3/04 (2006.01)
Patent
CA 1056762
CORROSION AND ABRASION RESISTANT ALUMINUM AND ALUMINUM ALLOY PLATES PARTICULARLY USEFUL AS SUPPORT MEMBERS FOR PHOTOLITHOGRAPHIC PLATES AND THE LIKE Abstract of the Disclosure A process for electrolytically forming on an aluminum or aluminum alloy sheet or plate a protective layer of film which is corrosion and abrasion-resistant and provided with a hydrophilic surface. The process consists in first anodizing the aluminum or aluminum alloy sheet or plate in an electrolyte consisting of an aqueous solution of a mineral acid such as to form on the aluminum or aluminum alloy surface an aluminum oxide film, and subsequently electrolytically treating the film in an aqueous solution of sodium silicate, such as to form a durable abrasion-resistant and corrosion-resistant. barrier layer on the sheet or plate of aluminum or aluminum alloy which is hydrophilic and which prevents deterioration of a light sensi- tive diazo resin r or the like, placed as a photosensitive coat- ing on the sheet or plate so as to form a presensitized litho- graphic plate.
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