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A method for the formation of anode foil for ultra-high voltage aluminum electrolytic capacitors

A technology of aluminum electrolytic capacitors and a chemical formation method, which is applied in electrolytic capacitors, electrolytic capacitor manufacturing, capacitors and other directions, can solve the problems of long processing time, inconvenient production control, unfavorable mass production, etc., and achieves improved hydration performance, Improved density and hydration resistance with less loss

Active Publication Date: 2020-10-13
XINJIANG JOINWORLD CO LTD
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  • Application Information

AI Technical Summary

Problems solved by technology

[0007] Method 1: Adopt three-level chemical conversion method, including pre-treatment, first-level chemical conversion, phosphoric acid treatment 1, high-temperature treatment 1, second-level chemical conversion, phosphoric acid treatment 2, high-temperature treatment 2, third-level chemical conversion, and post-treatment. Ammonium adipate, boric acid, and ammonium pentaborate are used as chemical forming liquids; the ultra-high pressure anode foil oxide film synthesized by this method has the advantages of good compactness, high capacity, and good water resistance, but the production process takes a relatively long time and the number of chemical formation stages is small , low production efficiency, not conducive to mass production
[0008] Method 2: Adopt the six-level chemical conversion method, including pretreatment, first-level chemical conversion, second-level chemical conversion, first liquid feeding, third-level chemical conversion, fourth-level chemical conversion, second liquid feeding, and fifth-level chemical conversion , the sixth stage of chemical formation, the first phosphoric acid treatment, the first high temperature treatment, six second chemical formation, the second phosphoric acid treatment, the second high temperature treatment, six third chemical formation, post-treatment, while using azelaic acid , boric acid, ammonium pentaborate, hypophosphite, and ammonium citrate are used as the chemical solution; this method has the advantages of short boosting time, small leakage current, long life, etc., but the production process is more complicated, there are many tanks, and the production control is not good. Convenience, not conducive to the stability of the product, adding organic acid is easy to produce defects

Method used

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  • A method for the formation of anode foil for ultra-high voltage aluminum electrolytic capacitors
  • A method for the formation of anode foil for ultra-high voltage aluminum electrolytic capacitors
  • A method for the formation of anode foil for ultra-high voltage aluminum electrolytic capacitors

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Experimental program
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Effect test

Embodiment 1

[0081] The specific operation steps are as follows:

[0082] (1) Pretreatment: Treat the corroded aluminum foil with a purity of 99.99% in pure water at 98° C. for 15 minutes.

[0083] (2) Primary formation: the pretreated aluminum foil is subjected to the first stage in an aqueous solution containing 1wt% boric acid, 0.5wt% ammonium pentaborate, 0.3wt% citric acid and citrate and 0.03wt% hypophosphite Power-on treatment, temperature 90°C, current density 55mA / cm 2 , the applied voltage is 35% of the terminal voltage (that is, 35% vf), and the formation takes 15 minutes.

[0084] (3) Secondary formation: the aluminum foil after the primary formation is subjected to a second-stage electrification treatment in an aqueous solution containing 2wt% boric acid and 0.4wt% ammonium pentaborate at a temperature of 90°C and a current density of 52mA / cm 2 , the applied voltage is 60% of the terminal voltage, and the formation takes 15 minutes.

[0085] (4) Tertiary chemical formation:...

Embodiment 2

[0110] The specific operation steps are as follows:

[0111] (1) Pretreatment: Treat the corroded aluminum foil with a purity of 99.99% in pure water at 90° C. for 25 minutes.

[0112] (2) Primary formation: the pretreated aluminum foil is subjected to the first stage in an aqueous solution containing 1wt% boric acid, 0.5wt% ammonium pentaborate, 0.2wt% citric acid and citrate and 0.02wt% hypophosphite Power-on treatment, temperature 80°C, current density 50mA / cm 2 , the applied voltage is 30% of the terminal voltage (that is, 30% vf), and the formation takes 15 minutes.

[0113] (3) Secondary formation: the aluminum foil after the primary formation is subjected to a second-stage electrification treatment in an aqueous solution containing 2wt% boric acid and 0.4wt% ammonium pentaborate at a temperature of 80°C and a current density of 45mA / cm 2 , the applied voltage is 70% of the terminal voltage, and it is formed for 10 minutes.

[0114] (4) Tertiary formation: the aluminu...

Embodiment 3

[0133] The specific operation steps are as follows:

[0134] (1) Pretreatment: Treat the corroded aluminum foil with a purity of 99.99% in pure water at 95° C. for 20 minutes.

[0135] (2) Primary formation: the pretreated aluminum foil is subjected to the first stage in an aqueous solution containing 1wt% boric acid, 0.5wt% ammonium pentaborate, 0.2wt% citric acid and citrate and 0.02wt% hypophosphite Power-on treatment, temperature 85°C, current density 45mA / cm 2 , the applied voltage is 32% of the terminal voltage (that is, 32% vf), and it is formed for 5 minutes.

[0136] (3) Secondary formation: the aluminum foil after the primary formation is subjected to a second-stage electrification treatment in an aqueous solution containing 2wt% boric acid and 0.4wt% ammonium pentaborate at a temperature of 85°C and a current density of 40mA / cm 2 , the applied voltage is 65% of the terminal voltage, and it is formed for 5 minutes;

[0137] The liquid feeding treatment is as follo...

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Abstract

The invention relates to a formation method for an anode foil of an extra-high voltage aluminum electrolytic capacitor. The formation method for the anode foil of the extra-high voltage aluminum electrolytic capacitor comprises the following steps: (1) pre-treatment; (2) first level formation; (3) second level formation; (4) third level formation; (5) four level formation; (6) five level primary formation; (7) primary high temperature treatment; (8) phosphoric acid treatment; (9) fifth level secondary formation; (10) secondary high temperature treatment; (11) fifth level third formation; and (12) post-treatment. According to the formation method, the voltage in each level formation is greater than that applied in the previous level formation. The formation method also comprises a liquid feeding treatment which is carried out after second level formation or third level treatment. The formation method for the anode foil of the extra-high voltage aluminum electrolytic capacitor is simpleto control, and the bath solution components are relatively simple and better to control, so that the formation method is suitable for industrial batch production.

Description

technical field [0001] The invention belongs to the technical field of aluminum electrolytic capacitor anode foil, and in particular relates to a method for forming an ultra-high voltage aluminum electrolytic capacitor anode foil. Background technique [0002] With the development of the electronics industry, the application of aluminum electrolytic capacitors is becoming more and more extensive. Various applications make the market place higher requirements on the performance of aluminum electrolytic capacitors, which are the most commonly used in electronic products. For example, there is pressure from the improvement of integrated circuits and complete machine circuits, and there is also pressure from the mutual penetration of other capacitors in high-voltage, high-frequency, long-life, and small-capacity applications. At present, in the research on the performance improvement of aluminum electrolytic capacitors, high voltage and long life have become a new research hots...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C25D11/08C25D11/12C25D11/24H01G9/00H01G9/055
CPCC25D11/08C25D11/12C25D11/24H01G9/0032H01G9/055
Inventor 杨辉李新芳赵刚刚
Owner XINJIANG JOINWORLD CO LTD
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