METHOD OF ETCHING ELECTRODE OF ALUMINUM ELECTROLYTIC CAPACITOR

PURPOSE:To extend the usable life of etchant by a method wherein the temperature of the etchant is elevated in accordance with the increase of an aluminum content in the etchant. CONSTITUTION:An aluminum electrode substrate is immersed in etchant composed of hydrochloric acid solution and phosphoric...

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Bibliographische Detailangaben
Hauptverfasser:	KANZAKI NOBUYOSHI, NAKANO KATSUTOSHI, SUGINO SATOSHI
Format:	Patent
Sprache:	eng
Schlagworte:	APPARATUS THEREFOR BASIC ELECTRIC ELEMENTS CAPACITORS CAPACITORS, RECTIFIERS, DETECTORS, SWITCHING DEVICES ORLIGHT-SENSITIVE DEVICES, OF THE ELECTROLYTIC TYPE CHEMISTRY ELECTRICITY ELECTROLYTIC OR ELECTROPHORETIC PROCESSES METALLURGY PROCESSES FOR THE ELECTROLYTIC REMOVAL OF MATERIALS FROMOBJECTS
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Beschreibung
Zusammenfassung:	PURPOSE:To extend the usable life of etchant by a method wherein the temperature of the etchant is elevated in accordance with the increase of an aluminum content in the etchant. CONSTITUTION:An aluminum electrode substrate is immersed in etchant composed of hydrochloric acid solution and phosphoric acid ions added to it and etched electrochemically by an AC current and, at the same time, the temperature of the etchant is elevated in accordance with the increase of an aluminum content in the etchant. For instance, 7% hydrochloric acid solution doped with 1.5% phosphoric acid ions is used as the etchant and the aluminum foil is etched by an AC current with a density of 0.15 A/cm . Then, in accordance with the increase of the aluminum content in the etchant, the etching temperature is elevated as shown by the attached diagram.