公开(公告)号：EP3389064A1

公开(公告)日：2018-10-17

申请号：EP16872671.9

申请日：2016-09-20

申请人： Nippon Light Metal Company, Ltd.

发明人： SHIMIZU, Yuta ,  YOSHIDA, Yuya ,  KATANO, Masahiko ,  SONE, Shinya ,  MEHATA, Masashi ,  TAIRA, Toshifumi

IPC分类号： H01G9/04 ,  H01G9/00 ,  H01G9/055

CPC分类号： H01G9/045 ,  C23F1/20 ,  H01G9/00 ,  H01G9/0029 ,  H01G9/04 ,  H01G9/0525 ,  H01G9/055 ,  H01G2009/0408 ,  H01G2009/0416

摘要： An aluminum electrode in which a porous layer made of a sintered layer of aluminum powder having an average particle diameter of 1 µm to 10 µm is laminated in a thickness of 150 µm to 3000 µm on a surface of an aluminum core material is produced by chemical formation to produce an anode for an electrolytic capacitor. In this process, an organic acid immersion step of immersing the aluminum electrode in an organic acid aqueous solution containing dodecanoic acid, benzoic acid, propanedioic acid, butanedioic acid, (E)-2-butenedioic acid, 2-hydroxypropane-1,2,3-tricarboxylic acid, (E)-1-propene-1,2,3-tricarboxylic acid, or the like is carried out after a pure water boiling step and before a chemical formation step. In the chemical formation step, a phosphoric acid immersion step of immersing the aluminum electrode in an aqueous solution containing phosphate ions is carried out one or more times in the course of raising a film withstand voltage to a chemical formation voltage.