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Method for manufacturing low-pressure chemical synthesis foil for aluminum electrolysis capacitor and middle treatment groove

A technology for aluminum electrolytic capacitors and manufacturing methods, applied in electrolytic capacitors, capacitors, electrolytic coatings, etc., can solve the problems of loss of electrostatic capacity, thick oxide film, and low processing efficiency, and achieve high passivation processing efficiency and excellent hydration resistance , The effect of high capacitance

Inactive Publication Date: 2008-08-06
乳源县立东电子科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

First of all, when the formation voltage reaches a high value, because the pores of the low-pressure formation foil are non-straight sponge-like pores, the oxide film formed on the surface is thicker, and the phosphate radical cannot diffuse into the pores during chemical treatment. It is difficult to cover the passivation treatment comprehensively and thoroughly; secondly, due to the low efficiency of chemical treatment, in order to achieve better results, the concentration and temperature are often increased, which will lose part of the electrostatic capacity, making the electrostatic capacity and hydration resistance unreliable. have both

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0025] After multi-stage chemical formation, the foil with the highest applied voltage of 20V is placed in the above-mentioned intermediate treatment tank, and treated in the phosphoric acid bath at 70°C, pH value 3.0±0.5, and phosphate concentration 0.1mol / L: Set voltage 10V, set current density 50mA / cm 2 , The processing time is 3 minutes, the intermediate processing is completed, and then cleaning, supplementary chemical conversion, heat treatment, post-processing are carried out, and finally the finished product is obtained. The same sample is chemically treated in 0.2mol / L phosphoric acid according to the commonly used conditions, and then the subsequent chemical conversion treatment, cleaning, re-chemical conversion, heat treatment, post-treatment, the maximum applied voltage of the subsequent chemical conversion treatment is 20V.

Embodiment 2

[0027] Preparation of intermediate treatment solution: add 0.5mL of concentrated ammonia water (concentration: 15mol / L) to 2L of 0.4mol / L phosphoric acid solution, and the resulting mixed solution is intermediate treatment solution, with a pH value of 2.0±0.5. After multi-stage formation, the foil with the highest applied voltage of 100V is placed in the above-mentioned medium treatment tank, and the treatment is carried out at 80°C: the set voltage is 18V, and the set current density is 50mA / cm 2 , The processing time is 6 minutes, and then cleaning, supplementary chemical conversion, heat treatment, post-processing, and finally the finished product is obtained. The same sample was chemically treated in 0.4mol / L phosphoric acid according to the commonly used conditions, and then cleaned, reformed, heat treated, and post-treated.

Embodiment 3

[0029] Preparation of intermediate treatment solution: Add 5.0mL of concentrated phosphoric acid (concentration 14.5mol / L) to 2L of 0.15mol / L ammonium dihydrogen phosphate solution, the pH value of the mixed solution is 4.5±0.5, which is the intermediate treatment solution, and the concentration of phosphate is 0.18mol / L. After multi-stage formation, the foil with the highest applied voltage of 50V is placed in the above-mentioned medium treatment tank, and the treatment is carried out at 60°C: the set voltage is 10V, and the set current density is 50mA / cm 2 , The processing time is 4.5 minutes, the intermediate processing is completed, and then cleaning, re-forming, heat treatment, post-processing are carried out, and finally the finished product is obtained. The same sample was chemically neutralized in 0.2mol / L phosphoric acid according to commonly used conditions, and then cleaned, reformed, heat-treated, and post-treated.

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Abstract

The invention relates to a method for forming foil by low voltage of an aluminum electrolytic capacitor and a treatment groove for forming foil, wherein the method comprises the following steps: placing the formed foil which is treated by forming treatment under the highest forming voltage into a medium treatment groove and a groove solution, and proceeding the medium treatment, then proceeding subsequent forming treatment, an electrode plate which is corresponded with the formed foil is arranged in the treatment groove, the groove solution comprises phosphorus acid and / or ammonium phosphate component, the medium treatment comprises the following steps: placing the anode of direct current power supply on the formed foil, placing the cathode of the direct current power supply on an electrode plate, imposing electricity to the forming foil, the voltage value of the imposing electrical treatment is lower than that of the highest formed. The forming method of the invention and the treatment groove has the advantages that the efficiency of deactivation treatment is high, the coverage of the deactivation treatment is more comprehensive and thoroughly, which can simultaneously obtain higher electrostatic capacity, good water resistance and hydratability.

Description

technical field [0001] The invention relates to a method for preparing an aluminum foil for a capacitor and its equipment, more specifically, the invention relates to a method for manufacturing a low-voltage anode foil for an electrolytic capacitor and its equipment. Background technique [0002] Electrolytic capacitors are widely used in many related industries such as electronics. Now, with the progress of science and technology and the development of industry, higher requirements are put forward for electrolytic capacitors in terms of power frequency, low impedance, and long life. In order to achieve higher electrical performance of electrolytic capacitors, it is often necessary to use high-moisture electrolytes in capacitors. However, at high temperatures, the aluminum foil oxide film, especially the anode foil oxide film, will hydrate with moisture, so that the anode foil Aluminum hydroxide is formed on the surface, which leads to a decrease in the withstand voltage of...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C25D11/20C25D11/36H01G9/055
Inventor 李道重
Owner 乳源县立东电子科技有限公司
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