| 摘要 |
PURPOSE:To obtain a metal plate for a printing plate material excellent in the stability of the quantity of a hydrophilic film, by applying cathodic electrolytic treatment to a steel plate or aluminum or aluminum alloy plate subjected to surface treatment as hydrophilic treatment in an aqueous solution containing a water-soluble zirconium salt. CONSTITUTION:Ething or mechanical grinding due to liquid homing is applied to a steel plate or aluminum or aluminum alloy plate with a thickness of 30-250mum prepared by a rolling method. Single layer plating or alloying plating treatment of chromium or nickel having anticorrosion effect is applied to the steel plate. Cathodic treatment is applied to the steel plate or aluminum or aluminum alloy plate, to which surface treatment was applied, in an aqueous solution containing one or more kind of a water-soluble zirconium salt. As the water-soluble zirconium salt, for example, there are potassium zirconium fluoride and sodium zirconium fluoride, etc. and one or more kind from among sulfuric acid, hydrochloric acid, nitric acid, fluoric acid, phosphoric acid, silicic acid or a water-soluble compound thereof may be added to said solution. |
