Matsushita Electric Industrial Co., Ltd.

Kenji Toyama

Nobuyoshi Kanzaki

Ryoichi Shimatani

Koichi Kojima

Masanori Okabayashi

Fumio Kudo

Katsutoshi Nakano

Akihiro Jujo

A method for electrolytically etching an aluminium foil for use as an electrode of an aluminium electrolytic capacitor is described. In the method, an aluminium foil is electrolytically etched an on the surfaces thereof in a 3 to 25% hydrochloric acid solution containing aluminium chloride by application of an AC current. The AC current has a waveform, each cycle of which consists of positive and negative half cycles and an OFF time interval between the respective half cycles at which the AC current becomes zero whereby the size of pits formed by the etching is suitably controlled.

Method for etching electrode foils for an aluminium electrolytic

Optimum conditions, employed in an etching process of an aluminum foil for use in an electrolytic capacitor, are selected and combined together for realizing an extension of the effective surface area of the foil. This extension also gives an enlargement of the electrostatic capacitance of the foil electrode as well as an enhancement of the mechanical strength of the foil itself, the latter had been considered to be hardly compatible with the former.

Method for producing foil electrodes for electrolytic capacitor

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Uji, Japan

Kenji Toyama