Production method of low pressure formed foil

A manufacturing method and technology of forming foil, applied in electrolytic capacitors, electrical components, circuits, etc., can solve problems such as weak bonding, environmental pollution, and increased waste discharge, achieve good passivation treatment effects, save raw material resources, and excellent The effect of hydration resistance

Inactive Publication Date: 2008-08-20
RUYUAN YAO AUTONOMOUS COUNTY DONGYANGGUANG FORMED FOIL CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] However, the existing passivation treatment has defects that cannot be ignored while improving product performance.
First of all, because the holes formed into foil at low pressure are non-straight sponge-like holes, the oxide film formed on the surface is thicker, and the phosphate radicals either cannot diffuse into the holes or are not firmly bonded during passivation treatment, resulting in passivation The treatment is difficult to cover completely or easily damaged; secondly, due to the low efficiency of passivation treatment, the concentration and temperature are often increased in order to achieve better results, which will easily lead to an increase in waste emissions, which will not only cause waste of resources, but also lead to environmental pollution

Method used

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  • Production method of low pressure formed foil

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Experimental program
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Effect test

Embodiment 1

[0024] According to the method of the present invention, making the foil with the highest conversion voltage of 20V, the specific method is as follows:

[0025] 1) The low-pressure corrosion foil is chemically treated in a 0.4mol / L ammonium adipate solution at 70°C, and the maximum applied voltage is 20V;

[0026] 2) Soak the foil in 0.25mol / L phosphoric acid solution at 60°C for 2 minutes, and then wash it with pure water;

[0027] 3) Perform the first re-formation treatment on the foil in the bath solution and temperature of 1), and the maximum applied voltage is 20V;

[0028] 4) Clean the formed foil and heat-treat it in an air atmosphere at a temperature of 500°C for 2 minutes;

[0029] 5) Carry out the second re-formation of the foil, the solution used is 0.4mol / L ammonium adipate + 0.02mol / L ammonium dihydrogen phosphate at 70°C, and the maximum applied voltage is 20V;

[0030] 6) After the foil is energized, the temperature of the bath is 80°C, and the bath contains 1...

Embodiment 2

[0036] According to the method of the present invention, the foil with the highest conversion voltage of 100V is made, and the specific method is as follows:

[0037]1) The low-pressure corrosion foil is subjected to chemical formation treatment in a 0.6mol / L ammonium adipate solution at 85°C, that is, the highest chemical formation voltage is 100V;

[0038] 2) Soak the formed foil in 0.38mol / L phosphoric acid solution at 70°C for 2 minutes, and then wash it with pure water;

[0039] 3) Perform the first re-formation treatment on the foil in the bath solution and temperature of 1), and the maximum applied voltage is 100V;

[0040] 4) Clean the formed foil and perform heat treatment in the air atmosphere at a temperature of 520°C for 2.5 minutes;

[0041] 5) Carry out the second re-formation of the foil, the solution used is 0.4mol / L ammonium adipate + 0.4mol / L ammonium dihydrogen phosphate at 75°C, and the maximum applied voltage is 100V;

[0042] 6) After the foil is energi...

Embodiment 3

[0049] According to the method of the present invention, the foil with the highest conversion voltage of 50V is made, and the specific method is as follows:

[0050] 1) The low-pressure corrosion foil is subjected to chemical conversion treatment in a 0.9mol / L ammonium adipate solution at 80°C, with a maximum chemical conversion voltage of 50V;

[0051] 2) Soak the foil in a 0.28mol / L phosphoric acid solution at 60°C for 2.5 minutes, and then wash it with pure water;

[0052] 3) Perform the first re-formation treatment on the foil in the bath solution and temperature of 1), and the maximum applied voltage is 50V;

[0053] 4) Clean the formed foil and perform heat treatment in the air atmosphere at a temperature of 490°C for 3 minutes;

[0054] 5) Carry out the second re-formation of the foil, the solution used is 0.4mol / L ammonium adipate + 0.2mol / L ammonium dihydrogen phosphate at 60°C, and the maximum applied voltage is 50V;

[0055] 6) The foil is treated after power-on, ...

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Abstract

The invention relates to a preparing method of a low-voltage formed foil, comprising the steps that: A) a low-voltage etched foil is formed; B) the formed foil is depolarized; C) the depolarized foil is first reformed; D) the first reformed foil is first heated; E) the first heated foil is second reformed, with a bath solution including ammoniun adipate solution added with phosphoric acid and/or monoammonium phosphate; F) the second reformed foil is put into organic multi-component phosphinic acid solution, electrified and post-processed ; and G) the post-processed foil is second heated to get the low-voltage formed foil. The preparing method can get better passivation effect and high passivation efficiency at the same time, saves resources, facilitates environment protection, and is more fit for workshop practical production conditions.

Description

technical field [0001] The invention relates to a method for preparing an aluminum foil for a capacitor, and more specifically, the invention relates to a method for manufacturing a low-voltage anode foil for an electrolytic capacitor. 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 the anode foil and an increase ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01G9/04H01G9/055C23F1/00C23F1/16H01G9/045H01G9/00
Inventor 李道重严志强
Owner RUYUAN YAO AUTONOMOUS COUNTY DONGYANGGUANG FORMED FOIL CO LTD
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