Pure inorganic acid formation process for positive electrode foil for high-voltage bolt type aluminium electrolytic capacitor

An aluminum electrolytic capacitor and bolt-type technology, applied in electrolytic capacitors, electrolytic capacitor manufacturing, capacitors, etc., can solve the problems of general leakage current, hydration resistance (unsatisfactory deterioration resistance, unsatisfactory oxide film quality, etc.

Active Publication Date: 2016-03-16
XINJIANG XIBU HONGYUAN ELECTRONICS CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] In the existing traditional anode foil formation process for high-voltage aluminum electrolytic capacitors, in order to obtain a stable oxide film working medium, a mixed acid containing boric acid or boric acid is used for formation. Although the quality of the formed porous oxide film is stable, it is resistant to hydration (anti- De

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0071] Pure inorganic acidification process of anode foil for high-voltage bolted aluminum electrolytic capacitors, the process includes the following steps in sequence:

[0072] (1) Pre-processing 1

[0073] Put the corroded foil in a place where impurity ions are removed, the temperature is 96°C, and the specific resistance reaches 10 5 Immerse in Ω·cm pure water for 12 minutes;

[0074] (2) Pre-processing 2

[0075] Put the aluminum foil after pretreatment 1 into 0.1wt% dicarboxylic acid solution for immersion, the immersion temperature is 80°C, and the immersion time is 90S;

[0076] (3) into 1

[0077] Put the aluminum foil that has been impregnated in pretreatment 2 into 0.1wt‰ phosphate solution for chemical formation, the pH of the phosphate solution is 3.5, the temperature is 70°C, the time is 4min, and the current density of formation is 0.01A / cm 2 ;

[0078] (4) into 2

[0079] Put the aluminum foil that has undergone chemical formation 1 into 0.1wt‰ phosphate...

Embodiment 2

[0101]Pure inorganic acidification process of anode foil for high-voltage bolted aluminum electrolytic capacitors, the process includes the following steps in sequence:

[0102] (1) Pre-processing 1

[0103] Put the corroded foil in a place where impurity ions are removed, the temperature is 98°C, and the specific resistance reaches 10 5 Immerse in pure water above Ω·cm for 14 minutes;

[0104] (2) Pre-processing 2

[0105] Put the aluminum foil that has undergone pretreatment 1 into 0.2wt% dicarboxylic acid solution for immersion, the immersion temperature is 80°C, and the immersion time is 60S;

[0106] (3) into 1

[0107] Put the aluminum foil that has been impregnated in the pretreatment 2 into a phosphate solution of 1.5wt‰ for formation. The pH of the phosphate solution is 5, the temperature is 85°C, the time is 5min, and the formation current density is 0.02A / cm 2 ;

[0108] (4) into 2

[0109] Put the aluminum foil that has undergone chemical formation 1 into a p...

Embodiment 3

[0131] Pure inorganic acidification process of anode foil for high-voltage bolted aluminum electrolytic capacitors, the process includes the following steps in sequence:

[0132] (1) Pre-processing 1

[0133] Put the corroded foil in a place where impurity ions are removed, the temperature is 97°C, and the specific resistance reaches 10 5 Immerse in pure water above Ω·cm for 12 minutes;

[0134] (2) Pre-processing 2

[0135] Put the aluminum foil after pretreatment 1 into 1wt% dicarboxylic acid solution for immersion, the immersion temperature is 85°C, and the immersion time is 30S;

[0136] (3) into 1

[0137] Put the pre-treatment 2 impregnated aluminum foil in 4wt‰ phosphate solution for formation, the pH of the phosphate solution is 7.5, the temperature is 95°C, the time is 10min, and the formation current density is 0.05A / cm 2 ;

[0138] (4) into 2

[0139] Put the aluminum foil that has undergone chemical formation 1 into 0.4wt‰ phosphate solution for chemical form...

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Abstract

The invention discloses a pure inorganic acid formation process for a positive electrode foil for a high-voltage bolt type aluminium electrolytic capacitor. The pure inorganic acid formation process is characterized by comprising the steps of dipping an etched foil into water for performing a dipping treatment to generate a hydrate film on the surface of the etched aluminium foil, then putting the etched aluminum foil, after the aluminum foil is subjected to the dipping treatment, into a dicarboxylic acid solution for further performing the dipping treatment, next putting the aluminum foil into a phosphate solution for performing a first time of formation to generate a dielectric oxide film on the surface of the aluminium foil; and then performing a second time of boric acid formation, and performing a roasting treatment and a phosphoric acid treatment to obtain the final positive electrode aluminium foil. According to the pure inorganic acid formation process for the positive electrode foil for the high-voltage bolt type aluminium electrolytic capacitor, the produced positive electrode foil is better in of electric property, low in current leakage, and high in hydration resistance, so that the formation process can particularly satisfy the high-quality demand of the high-voltage bolt type aluminium electrolytic capacitor; the service life of the high-voltage bolt type aluminium electrolytic capacitor can be prolonged, and the market competitiveness of the product is further enhanced; and in addition, experiments prove that the current leakage can be reduced by more than 28% by the formation process, and the service life of the aluminium electrolytic capacitor is improved by more than 1700 hours proved by an accelerated life test.

Description

technical field [0001] The invention relates to a forming process of an anode foil for a high-voltage bolt type aluminum electrolytic capacitor, in particular to a pure inorganic acid forming process. Background technique [0002] Anode foil is the key material for manufacturing high-voltage aluminum electrolytic capacitors. The life of high-voltage aluminum electrolytic capacitors mainly depends on the quality of the anode foil. The quality of the anode foil depends on the stability of the working medium oxide film on the surface of the aluminum foil. [0003] In the existing traditional anode foil formation process for high-voltage aluminum electrolytic capacitors, in order to obtain a stable oxide film working medium, a mixed acid containing boric acid or boric acid is used for formation. Although the quality of the formed porous oxide film is stable, it is resistant to hydration (anti- Deterioration) is not ideal, another electrical performance index parameter leakage cu...

Claims

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Application Information

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IPC IPC(8): H01G9/055H01G9/00C25D11/08
CPCC25D11/08H01G9/0029H01G9/055
Inventor 马坤松乔正山相志明陈厚兵吉民张拴
Owner XINJIANG XIBU HONGYUAN ELECTRONICS CO LTD
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