Refined aluminum foil for electrolytic capacitors
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United States of America Patent
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Oct 29, 2002
Grant Date -
N/A
app pub date -
Feb 14, 2000
filing date -
Feb 23, 1999
priority date (Note) -
Expired
status (Latency Note)
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Abstract
Thin foil of refined aluminum for the manufacture of anodes for electrolytic capacitors, the foil being formed of aluminum of a purity greater than 99.9% by weight and at least one of the elements Pb, B and In with an average total content of these elements of between 0.1 and 10 ppm by weight. The elements are distributed in a surface zone of the foil at a depth of 0.1 .mu.m, such that a signal current obtained by ionic analysis has a dispersion ratio (I.sub.max -I.sub.min)/I.sub.average of less than 5.
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