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Electrolyte for melting aluminum foil of anode of capacitor and aluminum foil melting method

A technology of anode aluminum foil and chemical formation method, which is applied in the direction of electrolytic coating, surface reaction electrolytic coating, coating, etc., can solve the problems of low electrostatic capacity and withstand voltage value of anode foil, etc.

Active Publication Date: 2011-10-12
富德(清远)电子铝箔有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The traditional formation process usually adopts a multi-stage formation method to gradually increase the thickness of the oxide film, during which it undergoes phosphoric acid treatment, high temperature treatment and re-formation process; when the traditional anode foil is formed, the electrolyte is mostly boric acid , adipic acid, phosphoric acid, hypophosphorous acid or salts of these acids to configure the electrolyte, coupled with many restrictions on the chemical formation process conditions, the electrostatic capacity and withstand voltage value of the produced anode foil are usually relatively low

Method used

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  • Electrolyte for melting aluminum foil of anode of capacitor and aluminum foil melting method
  • Electrolyte for melting aluminum foil of anode of capacitor and aluminum foil melting method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0071] Take the experimental results of 51Vf anode foil as an example:

[0072] (1) Turn the 20V sample into a film with a voltage of 23.8V and a specific volume of 75uF / cm 2 The corroded foil (using the method of EIAJ RC-2364A) is placed in the electrolyte solution containing 0.2% oxalic acid, 3.5% and deionized water, at a temperature of 65 ° C, 0.11A / dm 2 The electric current is treated for 100 seconds to obtain a first-grade formed foil.

[0073] (2) After cleaning the first-grade foil, put it into an 8% by weight ammonium adipate deionized aqueous solution, and at a temperature of 70°C, feed 0.16A / dm 2 The current is treated for 140 seconds to obtain a secondary formed foil.

[0074] (3) After cleaning the secondary foil, put it into 5.5% by weight ammonium adipate deionized aqueous solution, and pass through 0.17A / dm at a temperature of 70°C 2 The current is treated for 140 seconds to obtain a three-stage formed foil.

[0075] (4) After cleaning the tertiary formed f...

Embodiment 2

[0091] Take the experimental results of 142.0Vf anode foil as an example:

[0092] (1) Turn the 80V sample into a film with a voltage of 87.8V and a specific volume of 12.8uF / cm 2 The corroded foil (using the method of EIAJ RC-2364A) is placed in the electrolyte solution containing 0.6% oxalic acid, 5.25% ammonium adipate and ionized water. At a temperature of 75°C, 0.165A / dm 2 The electric current is treated for 140 seconds to obtain a first-grade formed foil.

[0093] (2) After cleaning the first-grade foil, put it into an 8% by weight ammonium adipate deionized aqueous solution, and at a temperature of 70°C, feed 0.16A / dm 2 The current is treated for 140 seconds to obtain a secondary formed foil.

[0094] (3) After cleaning the secondary foil, put it into 5.5% by weight ammonium adipate deionized aqueous solution, and pass through 0.17A / dm at a temperature of 70°C 2 The current is treated for 140 seconds to obtain a three-stage formed foil.

[0095] (4) After cleaning...

Embodiment 3

[0111] Take the experimental results of 150.0Vf anode foil as an example:

[0112] (1) Turn the 80V sample into a film with a voltage of 87.8V and a specific volume of 12.8uF / cm 2 The corroded foil (using the method of EIAJ RC-2364A) is placed in the electrolyte solution containing 1% oxalic acid, 7% ammonium adipate and ionized water. At a temperature of 85 ° C, 0.11A / dm 2 The electric current is treated for 180 seconds to obtain a first-grade formed foil.

[0113] (2) After cleaning the first-grade foil, put it into an 8% by weight ammonium adipate deionized aqueous solution, and at a temperature of 70°C, feed 0.16A / dm 2 The current is treated for 140 seconds to obtain a secondary formed foil.

[0114] (3) After cleaning the secondary foil, put it into 5.5% by weight ammonium adipate deionized aqueous solution, and pass through 0.17A / dm at a temperature of 70°C 2 The current is treated for 140 seconds to obtain a three-stage formed foil.

[0115] (4) After cleaning the...

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Abstract

The invention relates to an electrolyte for melting an aluminum foil and an aluminum foil melting method. The capacitor anode aluminum foil melting method comprises the steps of corrosion, multi-stage melting, intermediate treatment, heat treatment, re-melting and post treatment of the aluminum foil. The electrolyte used for melting in the first stage of the multi-stage melting comprises 0.2 to 1.0 percent of oxalate, 3.5 to 7 percent of ammonium adipate and the balance of water according to weight percentage. The aluminum foil of the capacitor anode, which is prepared by the method, has higher electrostatic capacity and withstand voltage.

Description

【Technical field】 [0001] The invention relates to the field of aluminum electrolytic capacitors, in particular to an aluminum foil forming electrolyte and an aluminum foil forming method. 【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. 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. In order to increase the electrostatic capacity of the anode foil, a method of increasing the specific surface area of ​​the electrode foil and the dielectric constant of the oxide film is generally adopted. [0003] The traditional capa...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C25D11/10C25D11/12
Inventor 钟斌曾建皇徐永进高伯安彭书洪
Owner 富德(清远)电子铝箔有限公司
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