Low voltage aluminum electrolysis capacitor formed foil production method

An aluminum electrolytic capacitor and a manufacturing method technology, applied in electrolytic capacitors, capacitors, circuits and other directions, can solve the problems of loss of electrostatic capacity, oxide film thickness, low processing efficiency, etc., achieve high passivation processing efficiency, improve hydration resistance, The effect of high electrostatic capacity

Active Publication Date: 2009-05-06
YIDU DONGYANGGUANG FORMED FOIL
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, chemical post-treatment also has defects that cannot be ignored while improving product performance.
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 post-treatment. It is difficult to cover the passivation treatment comprehensively and thoroughly; secondly, due to the low efficiency of chemical post-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 unsatisfactory. have both

Method used

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  • Low voltage aluminum electrolysis capacitor formed foil production method
  • Low voltage aluminum electrolysis capacitor formed foil production method
  • Low voltage aluminum electrolysis capacitor formed foil production method

Examples

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Effect test

Embodiment 1

[0027] According to the method of the present invention, making the foil with the highest conversion voltage of 20V, the specific method is as follows:

[0028] 1) The low-pressure corroded foil is subjected to chemical conversion treatment in 0.4mol / ammonium adipate solution at 75°C, divided into three stages, and the voltages are respectively first-level: 20V×40%=8V; second-level: 20V×80%=16V ;Third level: 20V×100%=20V, that is, the highest voltage is 20V;

[0029] 2) Soak the foil in 60°C, 0.02mol / L phosphorous acid solution for 2 minutes, and then wash it with pure water;

[0030] 3) Perform chemical conversion treatment on the foil again in the bath solution of 1), and the chemical conversion voltage is 20V;

[0031] 4) Clean the formed foil and heat-treat it in an air atmosphere at a temperature of 500°C for 2 minutes;

[0032] 5) The foil is chemically treated again, and the forming voltage is 20V; the solution used is 75°C, 0.4mol / L ammonium adipate and 1.5×10 -5 mo...

Embodiment 2

[0045] According to the method of the present invention, it is 20V foil that the highest conversion voltage is made, and the specific method is as follows:

[0046] 1) The low-pressure corrosion foil is subjected to chemical conversion treatment in a 0.4mol / L ammonium adipate solution at 75°C, divided into two stages, and the voltages are respectively first stage: 20V×50%=10V; second stage: 20×100%= 20V is the highest conversion voltage of 20V;

[0047] 2) Soak the foil in 60°C, 0.02mol / L phosphorous acid solution for 2 minutes, and then wash it with pure water;

[0048] 3) Perform chemical conversion treatment on the foil again in the bath solution of 1), and the chemical conversion voltage is 20V;

[0049] 4) Clean the formed foil and heat-treat it in an air atmosphere at a temperature of 500°C for 2 minutes;

[0050] 5) The foil was chemically treated again, the solution used was 75°C, 0.4mol / L ammonium adipate and 1.5×10 -5 mol / L mixed solution of ammonium dihydrogen ph...

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Abstract

The invention relates to a preparation method of a formed foil used for low-voltage aluminum electrolytic capacitors. The aluminum foil is respectively added with two new treating agents during formation, i.e. phosphite and amino trimethylene phosphonic acid ( ATMP); the aluminum foil which generates a filam is put in a phosphate dilute solution to be chemically treated, and a layer of aluminum phosphide film is generated on the surface of the aluminum foil to improve the hydration resistance of the foil; the aluminum foil is formed in an ATMP solution, which ensures that not only a hydration resistant phosphating film can be generated, but also the formed aluminum foil has high efficiency and more complete covering; the solubility of oxide film is much lower, thereby a very good water resistant film is obtained and the aluminum foil obtains higher electrostatic capacity simultaneously.

Description

Technical field: [0001] The invention relates to a method for manufacturing chemically formed foil for capacitors, in particular to a method for manufacturing anode foil for low-voltage aluminum electrolytic capacitors. Background technique: [0002] Electrolytic capacitors are widely used in many related industries such as electronics. Now, the advancement of science and technology and the development of industry have put forward higher requirements for electrolytic capacitors in terms of power frequency, low impedance, and long life. With the development of the electronic industry, electronic products are becoming more and more miniaturized and portable, so various electronic components tend to develop in the direction of miniaturization, and capacitors are no exception. The volume of aluminum electrolytic capacitors is mainly restricted by the electrostatic capacity of the anode foil (that is, the formed foil). The higher the capacitance of the anode foil, the smaller t...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01G9/045H01G9/048C23F17/00C25F3/04C23C22/08C22F1/04
Inventor 严志强
Owner YIDU DONGYANGGUANG FORMED FOIL
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