METHOD FOR PRODUCING ALUMINUM MATERIAL FOR ELECTROLYTIC CAPACITOR ELECTRODE, ALUMINUM MATERIAL FOR ELECTROLYTIC CAPACITOR ELECTRODE, METHOD FOR PRODUCING ELECTRODE MATERIAL FOR ELECTROLYTIC CAPACITOR, AND ALUMINUM ELECTROLYTIC CAPACITOR

摘要

An aluminum material for electrolytic capacitor electrodes is produced by bringing the surface of a cold-rolled aluminum material into contact with an aqueous acid solution containing one or more acids selected among sulfuric acids, hydrochloric acids and acids containing phosphorus, and then annealing the aluminum material. If necessary, the aluminum material is degreased before being brought into contact with the aqueous acid solution.