Method for forming ultrahigh-voltage anode foil for aluminum electrolytic capacitors

A technology of aluminum electrolytic capacitors and chemical formation methods, applied in the direction of electrolytic capacitors, capacitor electrodes, capacitors, etc., to achieve the effects of short boosting time, high specific volume, and thin oxide film

Active Publication Date: 2012-07-25
新疆金泰新材料技术股份有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Therefore, at present, in the fields of aerospace, automotive inverters, industrial inverters and other industries, there is an urgent need for ultra-hi

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028] Treat the corroded aluminum foil with a purity of 99.99% in pure water at a temperature of 93°C for 10 minutes; place it in 2% boric acid, 0.5wt% citric acid, 5wt% ammonium carbonate, and 0.05 wt% sodium hypophosphite aqueous solution , at 85°C, 50mA / (cm 2 ), 170V, 15 minutes; placed in 1.8 wt % boric acid, 0.45 wt % citric acid, 3 wt % ammonium carbonate, 0.02 wt % ammonium hypophosphite aqueous solution, at 85 ° C, 50 mA / (cm 2 ), 360v for 15 minutes; aluminum foil passed through 50 wt % ammonium citrate solution, and electrolyzed for 15 minutes at 30°C, 15V, 1500A; take it out and clean it, then place it in 0.05 wt % azelaic acid, 3.5 wt % boric acid, 1.2 wt % ammonium carbonate aqueous solution, at 85 ° C, 30mA / (cm 2 ) and 460v for 15 minutes; take it out and put it in 0.05 wt % azelaic acid, 4 wt % boric acid, 0.8 wt % ammonium carbonate aqueous solution, at 88 ℃, 30mA / (cm 2 ), 600v, 15 minutes; the aluminum foil passed through 30% ammonium adi...

Embodiment 2

[0030] Treat the corroded aluminum foil with a purity of 99.99% in pure water at a temperature of 94°C for 12 minutes; place it in an aqueous solution of 1.5% boric acid, 0.4wt% citric acid, 4wt% ammonium carbonate, and 0.03 wt% ammonium hypophosphite , at 88°C, 50mA / (cm 2 ), 200V for 12 minutes; placed in 1.2 wt % boric acid, 0.4 wt % citric acid, 2.5 wt % ammonium carbonate, 0.01 wt % ammonium hypophosphite aqueous solution, at 88 ° C, 50 mA / (cm 2 ), under the conditions of 400v, it was formed for 12 minutes; the aluminum foil was passed through 30wt% ammonium adipate solution, and electrolyzed for 12 minutes under the conditions of 30℃, 15V, 1400A; In 3wt% boric acid and 0.8wt% ammonium carbonate aqueous solution, at 85°C, 30mA / (cm 2 ), 590v, and formed for 12 minutes; take it out and put it in 0.06 wt % azelaic acid, 3.5 wt % boric acid, 0.4 wt % ammonium carbonate aqueous solution, at 88 ℃, 30mA / (cm 2 ), 700v, and formed for 12 minutes; aluminum foil...

Embodiment 3

[0032] Treat the corroded aluminum foil with a purity of 99.99% in pure water at a temperature of 93°C for 15 minutes; place it in 2% boric acid, 0.1wt% citric acid, 2wt% ammonium carbonate, and 0.01 wt% ammonium hypophosphite aqueous solution , at 88°C, 50mA / (cm 2 ), 260V, 12 minutes; placed in 1.2 wt % boric acid, 0.3 wt % citric acid, 2 wt % ammonium carbonate, 0.02 wt % ammonium hypophosphite aqueous solution, at 88 ° C, 50 mA / (cm 2 ) and 500v for 12 minutes; aluminum foil passed through 20wt% ammonium adipate solution and electrolyzed for 12 minutes at 30°C, 15V, 700A; take it out and clean it, then place it in 0.07wt% azelaic acid, In 3.5wt% boric acid and 0.8wt% ammonium carbonate aqueous solution, at 85°C, 30mA / (cm 2 ), 680v, and 12 minutes; take it out and place it in 0.07 wt % azelaic acid, 3.1 wt % boric acid, 0.3 wt % ammonium carbonate aqueous solution, at 88 °C, 30 mA / (cm 2 ), 800v, ​​and formed for 12 minutes; the aluminum foil passed throu...

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Abstract

The invention relates to the production of electronic components, and discloses a method for forming anode foil for electrolytic capacitors. The ultrahigh-voltage anode foil is formed through six stages, wherein from the stage 1 to stage 5, each stage has a formation tank, and in the stage 6, three formation tanks are connected in parallel; and an acid fluid mixture containing a boric acid, a citric acid or an azelaic acid (the electric conductance and pH value thereof are adjusted by using carbon-containing inorganic salts) and ammonium hypophosphite or sodium monophosphate for improving the boiled performance of an oxidation film is filled in each formation tank. Correspondingly, the processing step is also adjusted, and the produced anode foil not only can be applied to the fields and industries of aerospace and automotive frequency converters and industrial frequency converters and the like meeting the ultrahigh voltage requirements on a withstand voltage of 700-1200V, but also is dense in oxidation film surface, high in specific volume and short in boosting time.

Description

technical field [0001] The invention relates to a method for manufacturing a capacitor anode foil, in particular to a method for forming an ultra-high voltage anode foil for an aluminum electrolytic capacitor. Background technique [0002] At present, in addition to some articles and reports on the manufacturing methods of medium and high voltage anode foils in my country, there are also production implementations of 200-700v anode foils, but the withstand voltage of anode foils produced by these manufacturing methods generally does not exceed 700v . Therefore, at present, in the fields of aerospace, automotive inverters, industrial inverters and other industries, there is an urgent need for ultra-high voltage anode foils with a withstand voltage of more than 700v or even 1200v, and this urgent demand has not yet been produced, and it is still blank. Contents of the invention [0003] The purpose of the present invention is to overcome the above disadvantages, design and m...

Claims

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Application Information

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IPC IPC(8): H01G9/04H01G9/055C25D11/12
Inventor 严民冯天兰
Owner 新疆金泰新材料技术股份有限公司
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