| 摘要 |
<p>This invention relates to a material in the form of a sheet, a foil or a strip from aluminum or an alloy thereof, which has been chemically, mechanically and/or electrochemically roughened and optionallyanodically oxidized and has a hydrophilic surface coating applied to at least one surface thereof, which is based on at least one chemical compound containing at least one ionic functional group. This surface coating comprises a mixture of a) at least one salt having a silicate, fluoroborate, tetraborate or pentaborate anion and a monovalent cation and b) at least one alkali metal salt or ammonium salt of a sulfonic, phosphonic or tribasic or higher functionality carboxylic acid or of a phosphoric acid ester still carrying at leat one acid functional group, which gives an alkaline reaction in an aqueous solution and does not form an insoluble precipitate with the salt of part a) in an aqueous solution; optionally, this coating is additionally subjected to an acid rinsing step. Suitable compounds having the features indicated under b) include, for example, polyvinyl phosphonic acid and phytic acid. In the process for the manufacture of the inventive material, aluminum is caused to interact with an aqueous solution containing components a) and b), either by immersion or by an electrochemical treatment. The material is preferably used in the production of lithographic printing plates which carry a photosensitive coating.</p> |
