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Anode foil and preparation method thereof

A technology of anode foil and aluminum foil, which is applied in the manufacture of electrolytic capacitors, electrolytic coatings, surface reaction electrolytic coatings, etc., can solve the problems of low loss, undetectable, short life, etc. The effect of low production efficiency

Active Publication Date: 2020-12-18
XINJIANG JOINWORLD CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The process of pure organic acidification is characterized by high capacity and high bending strength. However, due to the mixture of various organic acids, the composition of the bath solution is difficult to control, and it cannot be detected, resulting in poor product stability and consistency, and large leakage current and long life. short
[0005] It can be seen that the above-mentioned process cannot meet the needs of high-voltage, low-loss and high-reliability electrical products, such as industrial robots, solar energy, welding machines, and aircraft flashlights.
Due to the harsh operating environment, these products require not only long life, but also low loss

Method used

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  • Anode foil and preparation method thereof
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  • Anode foil and preparation method thereof

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preparation example Construction

[0049] The preparation process of the present invention is:

[0050] Multi-stage pretreatment—one-stage formation—KD1 (liquid feed)—two-stage formation—three-stage formation—KD2 (liquid feed)—four-stage formation—five-stage formation—KD3 (liquid feed)—six-stage formation— Heat treatment 1—intermediate treatment 1—repair 1—heat treatment 2—intermediate treatment 2—repair 2—heat treatment 3—repair 3—post-treatment—drying.

[0051] The main solutes of the chemical conversion solution include: citric acid and citrate, adipic acid and adipate, ammonium dihydrogen phosphate, boric acid and borate, phosphoric acid.

[0052] The present invention can prepare a semi-amorphous oxide film by using special bath composition and process flow, and the oxide film has characteristics such as low loss, low ESR (impedance), and ripple current resistance, and the anode produced by this method Foil is water resistant and performs better.

Embodiment 1

[0092] The specific operation steps are as follows:

[0093] (1) Pretreatment 1: Treat the aluminum foil in pure water at 90-98°C for 10 minutes; dry;

[0094] (2) Pretreatment 2: Treat the aluminum foil that has undergone pretreatment 1 in pure water at 80-98°C for 12 minutes, and dry it;

[0095] (3) Primary chemical formation: the aluminum foil that has undergone pretreatment 2 is subjected to the primary chemical formation solution containing 20wt% ammonium adipate and adipate, and the temperature is 50°C, and the current density is 50mA / cm 2 , into 5min, the applied voltage is 80V;

[0096] (4) KD1 (the first liquid feeding): feed the aluminum foil after primary formation in 10wt% ammonium adipate solution for 5 minutes, the temperature of the bath solution is 25°C, the voltage is 25V, and the current is 1550A.

[0097] (5) Secondary chemical formation: the aluminum foil treated in step (3) is subjected to a secondary electric treatment at a temperature of 55 ℃, curren...

Embodiment 2

[0136] The specific operation steps are as follows:

[0137] (1) Pretreatment 1: After treating the aluminum foil in pure water at 95°C for 10 minutes, dry it;

[0138] (2) Pretreatment 2: Treat the aluminum foil that has undergone pretreatment 1 in pure water at 95°C for 6 minutes, and then dry it;

[0139] (3) Pretreatment 3: Treat the aluminum foil that has undergone pretreatment 2 in pure water at 90°C for 10 minutes, and then dry it;

[0140] (4) Primary formation: the aluminum foil that has undergone pretreatment 3 is subjected to the first-stage electrification treatment in the primary formation solution containing 10wt% citric acid and citrate, the temperature is 60°C, and the current density is 50mA / cm 2 , into 5min, the applied voltage is 80V;

[0141] (5) KD1 (the first liquid feeding): Feed the first-stage formed aluminum foil in 2.0wt% phosphoric acid solution for 5 minutes, the temperature of the bath solution is 30°C, the voltage is 25V, and the current is 155...

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Abstract

The invention relates to an anode foil and a preparation method thereof. The preparation method of the anode foil comprises the steps of (1) pretreatment; (2) primary formation; (3) secondary formation; (4) third-stage formation; (5) fourth-stage formation; (6) five-stage formation; (7) six-stage formation; (8) first heat treatment; (9) first intermediate treatment; (10) first repairing; (11) secondary heat treatment; (12) secondary intermediate treatment; (13) secondary repairing; (14) third heat treatment; (15) third repairing; and (16) post-treatment. According to the anode foil and the preparation method thereof, the production process is simple, the bath solution is easy to control, an anode foil oxide film prepared by the method can effectively reduce the loss of an aluminum electrolytic capacitor and prolong the service life of the aluminum electrolytic capacitor, and the special requirements of the market for industrial robots, solar energy, welding machines, flash lamps for airplanes and the like are met.

Description

technical field [0001] The invention belongs to the technical field of anode foil, and in particular relates to an anode foil and a preparation method thereof. Background technique [0002] Aluminum electrolytic capacitors have been widely used in electronic products due to their simple preparation, low price, and superior performance. With the rapid development of electronic technology, the scale and market demand continue to grow. The core material for the manufacture of aluminum electrolytic capacitors is aluminum anode foil, and the anode foil formed by different chemical formation process systems will determine the characteristics of the capacitor. The existing processes are divided into three categories: 1. Pure boric acid chemical synthesis process, which is characterized by long life and low loss, but low bending and capacity; 2. Organic acid process, which is characterized by high capacity and bending strength High, but large leakage current and short life; 3. Mixe...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01G9/00H01G9/045H01G9/055C25D7/06C25D11/10C25D11/12
CPCC25D7/0614C25D11/10C25D11/12H01G9/0029H01G9/045H01G9/055
Inventor 李新芳杨辉陈嘉庚赵刚刚罗湘平
Owner XINJIANG JOINWORLD CO LTD
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