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Method for manufacturing positive electrode aluminum foil of electrolytic capacitor

A technology of electrolytic capacitors and anode aluminum foil, applied in the direction of electrolytic capacitors, capacitor manufacturing, capacitors, etc., can solve the problems of unstable product quality, weakened dissolution, etc., and achieve the effect of high specific volume and good bending

Inactive Publication Date: 2008-01-23
DONGGUAN HEC CONDENSER CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

The organic acid in the second process adopts a straight-chain saturated dicarboxylic acid or a trans straight-chain unsaturated dicarboxylic acid with an odd number of carbon atoms, or an organic acid with an aromatic ring and a carboxyl group, so that the dissolution of the oxide film weakened, the bonding effect on the oxide film is enhanced, and the leakage current characteristics are improved, but there are deficiencies such as unstable product quality

Method used

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  • Method for manufacturing positive electrode aluminum foil of electrolytic capacitor

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Embodiment 1

[0017] Use a high-pressure corroded foil with a purity of 99.99%, treat it in pure water above 98°C for 12 minutes, and then treat it in an aqueous solution of 0.04wt% fumaric acid at 75°C for 2.5 minutes. wt%, 75°C phosphate for the first stage of formation, the current density is 20mA.cm -2 After reaching the predetermined voltage of 200V, it was kept constant for 8 minutes; then, the second-stage formation was carried out at 85°C in a mixed solution of 5wt% boric acid, 0.3wt% ammonium borate (or sodium) aqueous solution, and 0.5wt% citric acid, and the current density was 20mA .cm -2 When the voltage reaches 400V, keep the voltage constant for 10 minutes; then carry out the third-stage formation at 85°C in a mixed solution of 5wt% boric acid, 0.15wt% ammonium borate (or sodium) aqueous solution, and 0.1wt% citric acid, and keep the voltage constant when the voltage reaches 520V. Press for 15 minutes; then carry out the fourth-stage formation at 85°C in a mixed solution of ...

Embodiment 2

[0020] Use a high-pressure corrosion foil with a purity of 99.99%, treat it in pure water above 98°C for 10 minutes, and then treat it in an aqueous solution of 0.03wt% maleic acid at 75°C for 4 minutes. %, 85 ℃ phosphate for the first stage of formation, the current density is 30mA.cm -2 After reaching the predetermined voltage of 180V, it was constant for 8 minutes; then, the second-stage formation was carried out in a mixed solution of 3wt% boric acid, 1.0wt% ammonium borate (or sodium) aqueous solution, and 0.20wt% gluconic acid, with a current density of 20mA.cm -2 When the voltage reaches 350V, the constant voltage is 8 minutes; then in the mixed solution of 3wt% boric acid, 0.50wt% ammonium borate (or sodium) aqueous solution, and 0.10wt% gluconic acid, the third stage is formed at 85°C, and when the voltage reaches 480V, it is constant Press for 12 minutes; then carry out the fourth-stage formation at 85°C in a mixed solution of 3wt% boric acid, 0.10wt% ammonium borate...

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Abstract

The invention belongs to a method for producing high voltage anode aluminum foil in electrolytic capacitor, which relates to a reduction technology about the method for producing high voltage anode aluminum foil in electrolytic capacitor. The invention mainly comprises a number of procedures comprising pure water boiling, pre-processing, four-stage reduction, heat treatment, phosphoric acid treatment, depolarization treatment and after-treatment. After the treatment of pure water boiling, the aluminum foil will be treatment with a plurality of unsaturated organic acids, then undergone first-state reduction in phosphoric acid and salt, then undergone the second-stage, third-stage and fourth-stage reduction and depolarization in boric acid, boric acid ammonium (or natrium) or minim organic acid solution. Therefore, the produced anode aluminum foil has the advantages of high specific volume and excellent bending performance.

Description

[0001] Field [0002] The invention belongs to a method for manufacturing medium and high voltage anode aluminum foils of electrolytic capacitors. Background technique: [0003] At present, the manufacture of medium and high voltage anode foils for aluminum electrolytic capacitors mainly uses boric acid and ammonium borate or borax for chemical formation, including immersing the corroded foil in high-temperature pure water for a period of time as the first process; The aqueous solution of acid and at least one of these organic acid salts is the second step, and finally, the above-mentioned aluminum foil is subjected to a generation treatment in an electrolytic solution. The organic acid in the second process adopts a straight-chain saturated dicarboxylic acid or a trans straight-chain unsaturated dicarboxylic acid with an odd number of carbon atoms, or an organic acid with an aromatic ring and a carboxyl group, so that the dissolution of the oxide film weakened, the bonding e...

Claims

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Application Information

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IPC IPC(8): H01G9/055H01G13/00C25D11/16C25D11/04C25D11/12C25D11/08C25D11/10
Inventor 何凤荣
Owner DONGGUAN HEC CONDENSER CO LTD
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