Chemical conversion film of tantalum or niobium, method for forming the same and electrolytic capacitor using the same
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United States of America Patent
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May 29, 2007
Grant Date -
Apr 15, 2004
app pub date -
Dec 5, 2001
filing date -
Dec 13, 2000
priority date (Note) -
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Abstract
The present invention provides an electrolytic capacitor that operates stably even when used for a long period of time under severe conditions, and forms an intermediate composition portion of metal and oxide within a chemical conversion film to a thickness of 40 nm or more so as to suppress the migration of oxygen atoms within a chemical conversion film of a valve metal. This intermediate composition portion is obtained by subjecting a base metal comprised by containing nitrogen in a valve action metal to anodic oxidation treatment.
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