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Method for manufacturing foil by composite oxidation film at low pressure

A composite oxide film and manufacturing method technology, which is applied in anodic oxidation, electrolytic capacitors, electrical components, etc., can solve the problems of oxide film thickness, low processing efficiency, electrostatic capacity and hydration resistance, and improve hydration resistance performance effect

Inactive Publication Date: 2009-05-06
DONGGUAN HEC CONDENSER CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] However, chemical post-treatment also brings 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

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  • Method for manufacturing foil by composite oxidation film at low pressure

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Embodiment 1

[0035] A method for manufacturing composite oxide film into foil at low pressure, comprising the following steps:

[0036] According to the method of the present invention, the formation foil with the highest formation voltage of 20V is made, and the specific method is as follows:

[0037] a. The low-pressure corrosion foil is chemically treated in 0.4mol / L ammonium adipate solution at 70°C, divided into four stages, and the voltages are: the first stage voltage of the four-stage chemical formation is: 20v×35% =7v; the second voltage of the four-level formation is: 20×60%=12v; the third-level voltage of the four-level formation is: 20×80%=16v; the fourth-level voltage of the four-level formation is: 20×100 %=20v means the highest conversion voltage is 20V;

[0038] b. Soak the formed foil that has been chemically treated in step a in 0.01mol / L sodium silicate solution at 60°C for 2 minutes, and then wash it with pure water;

[0039] c. Place the formed foil after step b at 7...

Embodiment 2

[0054] A method for manufacturing composite oxide film into foil at low pressure, comprising the following steps:

[0055] According to the method of the present invention, the formation foil with the highest formation voltage of 100V is made, and the specific method is as follows:

[0056] a. The low-pressure corrosion foil is chemically treated in 0.6mol / L ammonium adipate solution at 85°C, divided into four stages, and the voltages are: the first stage voltage of the four-stage chemical formation is: 100v×35% =35v; the second voltage of the four-level formation is: 100×60%=60v; the third-level voltage of the four-level formation is: 100×80%=80v; the fourth-level voltage of the four-level formation is: 100×100 %=100v means the highest conversion voltage is 100V;

[0057] b. Soak the formed foil that has been chemically treated in step a in 0.01mol / L sodium silicate solution at 60°C for 6 minutes, and then wash it with pure water;

[0058] c. Place the formed foil after ste...

Embodiment 3

[0073] A method for manufacturing composite oxide film into foil at low pressure, comprising the following steps:

[0074] According to the method of the present invention, the formation foil with the highest formation voltage of 50V is made, and the specific method is as follows:

[0075] a. The low-pressure corrosion foil is subjected to chemical conversion treatment in 0.9mol / L ammonium adipate solution at 80°C, divided into three stages, and the voltages are: the first stage voltage of the three-stage chemical formation is: 50v×40% =20v; the second level voltage of the three-level formation is: 50×80%=40v; the third-level voltage of the three-level formation is: 50×100%=50v; that is, the highest formation voltage is 50V;

[0076] b. Soak the formed foil that has been chemically treated in step a in 0.01mol / L sodium silicate solution at 60°C for 6 minutes, and then wash it with pure water;

[0077] c. Place the formed foil after step b at 80°C in a 0.9 mol / L ammonium adipa...

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Abstract

The invention relates to the technical field of formed foils, in particular to a method for manufacturing a composite oxide film low-voltage formed foil. The method is as follows: firstly, a formed foil is treated by sodium silicate, and an aluminum silicate film is generated on the surface of the formed foil, is a good hydration resistant film and can improve the hydration resistance of the formed foil; and secondly, the formed foil is formed in a mixture of ATMP and ammonium adipate, and a hydrous aluminum phosphate film with good water resistance is generated. The aluminum silicate film and the hydrous aluminum phosphate film can effectively prevent reaction of an alumina film and water, improve the hydration resistance of the composite oxide film low-voltage formed foil, and prolong the service life of a capacitor.

Description

Technical field: [0001] The invention relates to the technical field of formed foils, in particular to a method for manufacturing composite oxide film low-pressure formed foils. Background technique: [0002] Electrolytic capacitors are widely used in many related industries such as electronics. 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. Therefore, 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 the volume of the capacitor can be made...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C25D11/04H01G9/055
Inventor 李道重严志强
Owner DONGGUAN HEC CONDENSER CO LTD
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