Method of etching aluminum

Details Method of etching aluminum Method of etching aluminum

1980-02-19

1981-10-27

Valentine, Donald R.

Chemistry: electrical and wave energy

Processes and products

Electrostatic field or electrical discharge

20412943, 204DIG9, 20412975, C25F 304

Patent

active

042971845

ABSTRACT:
A method of etching aluminum by applying an alternating electric current to aluminum which is in contact with an electrolyte containing hydrochloric acid, in which the alternating current has a symmetrical waveform wherein the current rises rapidly from zero to a maximum, then subsequently decreases rapidly in a first stage to an intermediate value which is about one-third to about one-half of the maximum, and thereafter decreases more slowly to zero in a second stage. Thereafter the current rises and falls in the opposite direction with the same waveform. The ratio of time of the second stage to time of the first stage of the waveform is in the range from 1 to 6. By this procedure higher capacitance values of the etched aluminum are obtained in comparison to prior procedures.

REFERENCES:
patent: 2930741 (1960-03-01), Burger et al.
patent: 3193485 (1965-07-01), Vincent
patent: 3477929 (1969-11-01), Namikata et al.
patent: 3520788 (1970-07-01), Paehr
patent: 4072589 (1978-02-01), Golda et al.
patent: 4087341 (1978-05-01), Takahashi et al.
patent: 4140599 (1979-02-01), Yamasaki et al.

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