| 摘要 |
PROBLEM TO BE SOLVED: To provide a highly productive etching method for realizing the increase of the capacitance of an etching foil for an aluminum electrode capacitor. SOLUTION: In this etching process for roughening aluminum or an aluminum alloy foil by AC application in etching solution containing chlorine ion; the waveform of AC currents is constituted of principal waveform and complementary waveform, the main waveform is AC waveform of 2 cycles or more, the frequency of complementary waveform is made higher than the frequency of principal waveform, and the complementary waveform is AC waveform of 2 to 10 cycles. The AC waveform is repeated while the impression time of the principal waveform is 1 to 30 seconds, and the rate of the maximum amplitude of the complementary waveform to the maximum amplitude of the principal waveform is 0.5 to 1.2. COPYRIGHT: (C)2005,JPO&NCIPI
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