The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Apr. 11, 2023
Filed:
Jun. 05, 2018
Nippon Light Metal Company, Ltd., Tokyo, JP;
Toyo Aluminium K. K., Osaka, JP;
Shuhei Enoki, Shizuoka, JP;
Yuta Shimizu, Shizuoka, JP;
Masahiko Katano, Shizuoka, JP;
Toshifumi Taira, Osaka, JP;
Kazuya Fujimoto, Osaka, JP;
Shinya Sone, Osaka, JP;
NIPPON LIGHT METAL COMPANY, LTD., Tokyo, JP;
TOYO ALUMINIUM K. K., Osaka, JP;
Abstract
When manufacturing an electrode for an electrolytic capacitor, in a first hydration step (ST), 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 (ST), 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 (ST), 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.