Litho Strip For Electrochemical Roughening And Method For Its Manufacture

Abstract

The invention relates to a litho sheet for electrochemical roughening, consisting of a rolled aluminium alloy, wherein the sheet surface has a topography with a maximum peak height Rp or Sp of not more than 1.4 µm, preferably not more than 1.2 µm, in particular not more than 1.0 µm. The invention also relates to a method which is intended for producing a litho sheet and in the case of which a litho sheet consisting of an aluminium alloy is cold-rolled and in the case of which the litho sheet, following the final cold-rolling pass, is subjected to a degreasing treatment with a pickling step using an aqueous pickling medium, wherein the aqueous pickling medium contains at least 1.5 to 3% by weight of a mixture of 5-40% sodium tripolyphosphate, 3-10% sodium gluconate, 3-8% non-ionic and anionic surfactants and, optionally, 0.5-70% soda, wherein the concentration of sodium hydroxide in the aqueous pickling medium is between 0.1 and 5% by weight and the surface area removed by the degreasing treatment with simultaneous pickling step is at least 0.25 g/m2.

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