| 摘要 |
PROBLEM TO BE SOLVED: To provide a manufacturing method, which makes the capacitor of electrode foil for electrolytic capacitor high, can reduce leakage current and can improve water resistance. SOLUTION: A pure boiling process for immersing an etched aluminum foil in high-temperature pure water for prescribed time period, a process for forming an anode oxide coat with adipic acid chemical liquid and a process for forming the anode oxide coat with silicic acid chemical liquid being installed and a different oxide coat is formed. Thus, the capacity of electrode foil is made high, leakage current is reduced and water resistance can be improved. Then, an electrolytic capacitor can be miniaturized, and capacity can be made to be high and the practical value becomes high.
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