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A Six-Stage Formation Process of High Stability High Voltage Anode Foil

A high-stability, anode foil technology, applied in the field of electrode foil, can solve the problems of inability to improve the hydration resistance and stability of the anode foil, the limited effect of the hydration resistance of the anode foil, flash fire on the surface of the anode foil, etc., to achieve high capacity, The effect of increasing the upper limit of voltage and high bending

Active Publication Date: 2021-12-07
XINJIANG JOINWORLD CO LTD +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, when the addition amount is too much or the formation voltage is too high, many problems such as anode foil corrosion, anode foil surface flash fire, and formation liquid whitening will occur, thus limiting the addition concentration of inorganic phosphoric acid or phosphate and the applicable upper limit of formation voltage
Since more phosphorus cannot be incorporated into the oxide film of the high-voltage anode foil, the effect of improving the hydration resistance of the anode foil and reducing the defects of the oxide film is limited
[0005] In the prior art, organic phosphine substances such as hydroxyethylidene diphosphonic acid, sodium ethylenediamine tetramethylene phosphonate, polyamino polyether group methylene phosphonic acid are added to the post-treatment liquid to improve the hydration resistance of the anode foil surface method, but this technology only acts on the surface of the anode foil, and cannot improve the overall hydration resistance and stability of the anode foil

Method used

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  • A Six-Stage Formation Process of High Stability High Voltage Anode Foil
  • A Six-Stage Formation Process of High Stability High Voltage Anode Foil
  • A Six-Stage Formation Process of High Stability High Voltage Anode Foil

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0100] (1) Primary feed: the conductive silver roller supplies power to the primary and secondary forming feeds.

[0101] (2) Boiling in high temperature water: soak the foil in water above 95°C for 11 minutes.

[0102] (3) Primary chemical synthesis: use a forming solution containing 2.0g / L ammonium dihydrogen phosphate, 1.0g / L citric acid, 1.0g / L triammonium citrate and 0.05g / L sodium hypophosphite for primary chemical synthesis , current density 80mA / cm 2 , the voltage is 150V, the formation time is 5min30s, and the processing temperature is 90°C.

[0103] (4) Secondary chemical formation: use a forming solution containing 1.0g / L ammonium dihydrogen phosphate, 0.6g / L citric acid, 0.5g / L triammonium citrate and 0.05g / L sodium hypophosphite for secondary chemical formation , current density 80mA / cm 2 , the voltage is 300V, the formation time is 5min30s, and the processing temperature is 90°C.

[0104] (5) Tertiary chemical conversion: use a forming solution containing 0.2...

Embodiment 2

[0107] The method of formation is the same as in Example 1, the difference is that the third stage forming liquid:

[0108] Tertiary chemical conversion: use a forming solution containing 0.2g / L citric acid and 0.7g / L ammonium dihydrogen phosphate to perform tertiary chemical conversion with a current density of 80mA / cm 2 , voltage 450V, formation time 8min10s, processing temperature 90°C.

[0109] Under the voltage of 450V, under the above-mentioned anodizing conditions, the third-stage forming liquid is clear and transparent, there is no flash fire on the surface of the anode foil, and the edge corrosion of the anode foil is relatively light.

Embodiment 3

[0111] The method of formation is the same as in Example 1, the difference is that the third stage forming liquid:

[0112] Tertiary chemical conversion: use a forming solution containing 0.2g / L citric acid and 0.6g / L ammonium dihydrogen phosphate to perform tertiary chemical conversion with a current density of 80mA / cm 2 , voltage 450V, formation time 8min10s, processing temperature 90°C.

[0113] Under the voltage of 450V, under the above-mentioned anodizing conditions, the third-stage forming liquid is clear and transparent, there is no flash fire on the surface of the anode foil, and the edge of the anode foil is severely corroded.

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Abstract

The invention is a six-stage chemical formation process of high-stability high-voltage anode foil. A six-stage chemical formation process for high-voltage high-voltage anode foils with high stability, including: (1) pretreatment; (2) primary chemical formation; (3) secondary chemical formation; (4) monobutyl phosphate treatment 1; (6) Four-stage chemical formation; (7) Sintered sheet treatment 1; (8) Phosphoric acid treatment 1; (9) Five-stage chemical formation; (10) Six-stage chemical formation; (11) Phosphoric acid treatment 2; (12) After (13) phosphoric acid treatment 3; (14) back-end repair 2; (15) burn-in treatment 2; (16) back-end repair 3; (17) post-treatment. The six-stage formation process of a high-stability high-voltage anode foil described in the present invention has a simple process and is easy to operate, and can produce high-stability high-voltage anode foil in batches, and the anode foil produced has high capacity, low leakage, and high bending And the multiple advantages of strong hydration resistance.

Description

technical field [0001] The invention belongs to the technical field of electrode foils, and in particular relates to a six-stage chemical formation process of high-voltage high-voltage anode foils with high stability. Background technique [0002] With the progress of society, people have put forward higher requirements for the life and quality of aluminum electrolytic capacitor products. Anode foil for aluminum electrolytic capacitors (hereinafter referred to as anode foil) is the key raw material for the manufacture of aluminum electrolytic capacitors. The chemical formation process of anode foil largely determines the performance of anode foil products. At present, in order to increase the capacity of the anode foil, organic acids such as citric acid and adipic acid are mostly used to form it, but there are problems of large leakage current and poor hydration resistance, which seriously affect the service life of the capacitor. [0003] The organic acid processes such as...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01G9/055
CPCH01G9/055
Inventor 林颖王江波祝进力黄予涵汪鑫李朋辉何志远庄晓彤白晶
Owner XINJIANG JOINWORLD CO LTD
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