| 摘要 |
A porous aluminum anode element having an increased effective surface area is prepared by an electrolytic etching process using an etchant solution containing CrO4-- in a higher concentration and a lower current density than those heretofore proposed. Currents of a digital signal type, such as a pulse current, or those of triangular, sawtooth, trapezoidal or staircase waveform, are preferred.
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