ELECTROCHEMICAL ETCHING OF HIGH VOLTAGE ALUMINIUM ANODE FOIL

摘要

Aluminium electrolytic capacitor foil of a high cubic texture etched by passing the foil through an electrolyte bath containing 3% hydrochloric acid and 1% aluminum as aluminum chloride under the influence of a direct current and at a temperature of 75 DEG C. The foil thus etched has a significantly higher capacitance resulting from a greater density of tunnels, an elongation of the tunnels, and a fairly linear tunnel structure in the foil.