METHOD FOR MANUFACTURING ELECTRODE FOR ALUMINUM ELECTROLYTIC CAPACITORS

Title:

METHOD FOR MANUFACTURING ELECTRODE FOR ALUMINUM ELECTROLYTIC CAPACITORS

Document Type and Number:

WIPO Patent Application WO/2019/220690

Kind Code:

A1

Abstract:

A first method for manufacturing an electrode for aluminum electrolytic capacitors includes, as pretreatment steps for a chemical conversion treatment step (ST14), a hydration treatment step (ST11), a heat treatment step (ST12) and a post-heat-treatment hydration treatment step (ST13). In the hydration treatment step (ST11), an aluminum electrode (1) is immersed in pure water having a temperature of 70°C or higher to form a hydration coating film on the aluminum electrode (1). In the heat treatment step (ST12), the aluminum electrode (1) is heated in an atmosphere having a temperature of 300 to 600°C inclusive to dehydrate the aluminum electrode (1). In the post-heat-treatment hydration treatment step (ST13), the aluminum electrode (1) is immersed in a hydration treatment solution which is prepared by adding a hydration inhibitor to pure water and has a temperature of 70°C or higher. In the post-heat-treatment hydration treatment step (ST13), the hydration inhibitor added to the pure water is, for example, phosphoric acid or a salt thereof.

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Inventors:

SHIMIZU YUTA (JP)
ENOKI SHUHEI (JP)
SHIRAI ASAMI (JP)
KATANO MASAHIKO (JP)

Application Number:

PCT/JP2019/002666

Publication Date:

November 21, 2019

Filing Date:

January 28, 2019

Export Citation:

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Assignee:

NIPPON LIGHT METAL CO (JP)

International Classes:

H01G9/00

Foreign References:

JPH09246108A	1997-09-19
JPH0574663A	1993-03-26
JPH04364019A	1992-12-16
JPS53135452A	1978-11-27
JPS54102251A	1979-08-11
JP2000003835A	2000-01-07