| 摘要 |
PROBLEM TO BE SOLVED: To obtain a high roughening rate in aluminum foil for an electrolytic capacitor by electroless etching. SOLUTION: The aluminum foil for an electrolytic capacitor to be subjected to etching has a composition comprising, by mass, 5 to <50 ppm Fe and 5 to 60 ppm Si, and further comprising one or more kinds selected from Mn, Zn, Ni, Sn, Ag, Pt and Au by >40 to 500 ppm in total, and the balance Al of≥99.9% with inevitable impurities, and in which the content of Cu in the inevitable impurities is regulated to <15 ppm. Its chemical solubility improves, electroless etching is made possible, and deterioration in a chemical film by low purity is not caused. Application of electrolytic etching is made possible as well, and etching having a more increased reaction rate is made possible. COPYRIGHT: (C)2007,JPO&INPIT
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