Title: Manufacture of anode foil used in aluminium electrolytic capactiance
Application Number: 94103155 Application Date: 1994.03.18
Publication Number: 1092823 Publication Date: 1994.09.28
Approval Pub. Date: 2002.11.27 Granted Pub. Date: 2002.11.27
International Classifi-cation: C25D11/06;C25D11/16;H01G9/00
Applicant(s) Name: Matsushita Electric Industrial Co., Ltd. Address:
Inventor(s) Name: Tadayoshi Kurihara;Kazuo Okamura;Yoshihito Yoshiru
Attorney & Agent: ZHAO GUOHUA
Abstract:
    The inbention relates to a production method for anode foil for use in aluminium electrolytic capacitor. This invention includes a first step for dipping etched aluminium foil into pure water of high temperature for a predetermined period of time, a second step for dipping the aluminium foil into an aqueous solution containing an organic acid and at least one kind of a salt thereof after the first step, and a third step for subjecting the aluminium foil to a forming treatment in an electrolytic solution after the second step, wherein either straight saturated dicarboxylic acid having an odd number of carbons or trans-straight unsaturated dicarboxylic acid is used or organic acid having an aromatic ring and a carboxyl group is used as the organic acid in the second step, whereby leakage current characteristics are improved by weakening a dissolving action to a hydrated film and strengthening a bonding action to the hydrated film.
Time: 14