Cleaning and treatment of etched cathode aluminum capacitor foil

Details Cleaning and treatment of etched cathode aluminum capacitor foil Cleaning and treatment of etched cathode aluminum capacitor foil

1982-12-10

1984-02-21

Valentine, Donald R.

Chemistry: electrical and wave energy

Processes and products

Electrostatic field or electrical discharge

2041415, 204207, 134 3, 134 28, 134 41, C25F 304, C25F 100, C23G 102, B08B 300

Patent

active

044328460

ABSTRACT:
An improved method is disclosed for producing cathode aluminum foil for electolytic capcitors in which aluminum foil of 98.0% to 99.99% purity is etched in an electrolytic bath containing a chloride or hydrochloric acid in water solution while subjected to an AC and/or DC current, and treated following etching by immersion in an aqueous solution of nitric acid containing about 2.5 to about 3.7 weight percent nitric acid, rinsing, and immersion in an aqueous solution containing about 1.5 to about 5.0 weight percent chromic acid and about 3.0 to about 5.0 weight percent phosphoric acid, again rinsed to substantially completely remove chloride ions from the etched foil surface and increase the capacitance of the foil, and to substantially reduce the capacitance decay rate of the treated foil. The treated foil may be passivated in an aqueous solution of a carboxyl acid, preferably a 1.5 to 5.0 weight percent solution of citric acid in deionized water, before drying.

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patent: 4279715 (1981-07-01), Arora et al.
patent: 4292148 (1981-09-01), Bernard
patent: 4332652 (1982-06-01), Arora et al.

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