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公开(公告)号：US20200227209A1
公开(公告)日：2020-07-16
申请号：US16634188
申请日：2018-06-05
发明人： Shuhei ENOKI , Yuta SHIMIZU , Masahiko KATANO , Toshifumi TAIRA , Kazuya FUJIMOTO , Shinya SONE
摘要： When manufacturing an electrode for an electrolytic capacitor, in a first hydration step (ST1), an aluminum electrode is immersed in a first hydration processing solution having a temperature of at least 70° C. and comprising pure water or an aqueous solution to which phosphoric acid or a phosphate has been added so that the phosphorus concentration is no greater than 4 mass ppm. In a second hydration step (ST2), the aluminum electrode is immersed in a second hydration processing solution to which phosphoric acid or a phosphate has been added so that the phosphorus concentration is 4-5000 mass ppm, the second hydration processing solution having a pH of 3.0-9.0 and a temperature of at least 70° C. In a chemical conversion step (ST3), at least a boric acid chemical conversion process in which the aluminum electrode is chemically converted in a boric acid-based chemical conversion solution is included, and a chemical conversion coating having a coating withstand voltage of at least 200 V is formed on the aluminum electrode.
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公开(公告)号：US20210335554A1
公开(公告)日：2021-10-28
申请号：US16977255
申请日：2019-01-16
发明人： Yuta SHIMIZU , Masahiko KATANO , Toshifumi TAIRA , Kazuya FUJIMOTO , Shinya SONE
摘要： In production of an electrode for an aluminum electrolytic capacitor, a hydrated film is formed onto an aluminum electrode including a porous layer by immersing the aluminum electrode into a first hydration treatment liquid having a temperature of 80° C. or more in a first hydration treatment step (ST1) and thereafter the aluminum electrode is heated in an atmosphere having a temperature of 150° C. or more and 350° C. or less in a dehydration step (ST2). Subsequently, a hydrated film is formed onto the aluminum electrode by immersing the aluminum electrode into a second hydration treatment liquid having a temperature of 80° C. or more in a second hydration treatment step (ST3) and thereafter chemical formation of the aluminum electrode is performed at 400 V or more and further 600 V or more in a chemical formation step.
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公开(公告)号：US20200013556A1
公开(公告)日：2020-01-09
申请号：US16483405
申请日：2017-12-07
发明人： Yuta SHIMIZU , Shuhei ENOKI , Masahiko KATANO , Toshifumi TAIRA , Kazuya FUJIMOTO , Shinya SONE
摘要： A method for producing an electrode for an aluminum electrolytic capacitor is provided that can reduce defects in a chemical formation film formed at a chemical formation voltage of 500 V or higher.For producing the electrode for an aluminum electrolytic capacitor, an aluminum electrode is brought into contact with pure water having a temperature of 70° C. or higher to form a hydrated film having a suitable film thickness on the aluminum electrode at a hydration step, and then chemical formation is performed thereon at a chemical formation voltage of 500 V or higher in a chemical formation solution having a temperature of 40° C. or higher at a chemical formation step. At the chemical formation step, when the relative velocity of the chemical formation solution to the aluminum electrode is represented by a three-dimensional velocity vector B−A and the absolute value of the velocity vector B−A is represented by |B−A|, the absolute value |B−A| of the velocity vector satisfies the following conditional formula. 3 cm/s≤|B−A|≤100 cm/s
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