FIELD: electrical engineering, manufacture of anodes of high-voltage electrolytic capacitors.
SUBSTANCE: foil of refined aluminum with purity above 99.9% for manufacture of anodes of electrolytic capacitors has average content by mass for sum of elements Pb + B + In amounting to 0.1 to 10 parts per million (preferably from 0.5 to 5 parts per million). These elements are so distributed in surface zone with depth 0.1 mcm that intensity of their signal generated by way of ionic analysis has dispersive ratio Rd = (Imax-Imin)/I average is below 5, preferably 2. Formula of invention describes process of production of such foil.
EFFECT: enhanced capacitance of capacitor.
6 cl, 3 dwg, 1 tbl
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