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US 6,471,793 B1Granted
Refined aluminum foil for electrolytic capacitors
AssigneePechiney Rhenalu
InventorJean-Remi Butruille
Life of this patent
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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 μm, such that a signal current obtained by ionic analysis has a dispersion ratio (Imax−Imin)/Iaverage of less than 5.
Claims6
Thin foil of refined aluminum for the manufacture of anodes for electrolytic capacitors,
- said foil comprising 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 said elements of between 0.1 and 10 ppm by weight,
- said elements being distributed in a surface zone of said foil at a depth of 0.1 μm, such that a signal current obtained by ionic analysis has a dispersion ratio (Imax−Imin)/Iaverage of less than 5.
Dependencies are inferred from the claim text.