Process additives to reduce etch resist undercutting in the manufacture of anode foils
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United States of America Patent
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Jun 4, 2019
Grant Date -
Jun 7, 2018
app pub date -
Mar 15, 2017
filing date -
Dec 2, 2016
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Abstract
Anode foil, preferably aluminum anode foil, is etched using a process of adding an etch resist to the anode foil and treating the foil in an electrolyte bath composition comprising a sulfate, a halide, an oxidizing agent, a surface active agent, and a non-ionic surfactant. The anode foil is etched in the electrolyte bath composition by passing a charge through the bath. The etched anode foil is suitable for use in an electrolytic capacitor.
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