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Intermediate treatment method of electrode foil for medium and high voltage aluminum electrolytic capacitors

A technology of aluminum electrolytic capacitors and processing methods, applied in electrolytic capacitors, capacitors, circuits, etc., can solve the problems of large lateral deviation and high thinning rate, and achieve the effects of reducing lateral deviation, balancing potential energy, and increasing specific surface area

Active Publication Date: 2018-01-12
NANTONG HAIXING ELECTRONICS +2
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This electrode foil manufacturing method has a high thinning rate and a large lateral deviation of the capacitance at 11 o'clock

Method used

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Examples

Experimental program
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Effect test

Embodiment 1

[0013] Example 1, medium treatment method of electrode foil for medium and high voltage aluminum electrolytic capacitors: take aluminum foil with a purity of 99.99%, dip it in an aqueous solution of 25% sulfuric acid and 4% hydrochloric acid at 65°C for 90 seconds, take it out and place it In an aqueous solution of 25% sulfuric acid and 4% hydrochloric acid, under the condition of 74°C and a current density of 0.2A / (cm)2, first-level corrosion for 150 seconds; after taking it out, wash it with tap water, and then dry it in an oven at 350°C Finally, use ultrasonic waves in tap water at a temperature of 23°C with a frequency of 50KHZ and a power of 5KW for 10 seconds, and then rinse in 6wt% nitric acid solution for 40 seconds. After taking it out, it is subjected to secondary corrosion for 1000 seconds in an aqueous solution of 9% nitric acid and 0.5% phosphoric acid at 65°C and a current density of 0.10 A / (cm)2; In the solution, chemically wash for 180 seconds under the conditi...

Embodiment 2

[0014] Example 2, medium treatment method of electrode foil for medium and high voltage aluminum electrolytic capacitors: take aluminum foil with a purity of 99.99%, dip it in an aqueous solution of 25% sulfuric acid and 4% hydrochloric acid at 65°C for 90 seconds, take it out and place it In an aqueous solution of 25% sulfuric acid and 4% hydrochloric acid, under the condition of 74°C and a current density of 0.2A / (cm)2, first-level corrosion for 150 seconds; after taking it out, wash it with tap water, and then dry it in an oven at 350°C Finally, use ultrasonic waves in tap water at a temperature of 23°C with a frequency of 50KHZ and a power of 5KW for 30 seconds, and then wash them in 6wt% nitric acid solution for 40 seconds. After taking it out, it is subjected to secondary corrosion for 1000 seconds in an aqueous solution of 9% nitric acid and 0.5% phosphoric acid at 65°C and a current density of 0.10 A / (cm)2; In the solution, chemically wash for 180 seconds under the con...

Embodiment 3

[0015] Example 3, medium treatment method of electrode foil for medium and high voltage aluminum electrolytic capacitors: take aluminum foil with a purity of 99.99%, dip it in an aqueous solution of 25% sulfuric acid and 4% hydrochloric acid at 65°C for 90 seconds, take it out and place it In an aqueous solution of 25% sulfuric acid and 4% hydrochloric acid, under the condition of 74°C and a current density of 0.2A / (cm)2, first-level corrosion for 150 seconds; after taking it out, wash it with tap water, and then dry it in an oven at 350°C Finally, use ultrasonic waves in tap water at a temperature of 23°C with a frequency of 50KHZ and a power of 5KW for 50 seconds, and then wash them in 6wt% nitric acid solution for 40 seconds. After taking it out, it is subjected to secondary corrosion for 1000 seconds in an aqueous solution of 9% nitric acid and 0.5% phosphoric acid at 65°C and a current density of 0.10 A / (cm)2; In the solution, chemically wash for 180 seconds under the con...

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PUM

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Abstract

The invention discloses an intermediate processing method of an electrode foil for a middle-high voltage aluminium electrolytic capacitor. The intermediate processing method comprises steps of pretreatment, primary corrosion, intermediate processing, secondary corrosion, aftertreatment, drying corrosion and the like. The described intermediate processing comprises washing, drying, ultrasonic washing, and chemical washing. The intermediate processing is that an aluminium foil processed by primary corrosion is washed by tap water, then is subjected to ultrasonic processing for 10 to 50 seconds in tap water with a temperature of 10 to 50 DEG C under the conditions of frequency of 1 to 50KHZ and power of 0.5 to 5KW by using ultrasonic waves after being dried by a drying oven with a temperature of 150 to 350 DEG C, and finally, is chemically washed for 40 to 120 seconds in 2 to 6 weight percent of hydrochloric acid solution. The intermediate processing method disclosed by the invention has the advantages that compared with an original process, when the intermediate processing method is adopted to process a dried and washed anode etched foil, a thinning ratio is reduced by 2 to 4mum, and a 11-point lateral deviation of a electrostatic capacity is reduced by 15 to 30 percent.

Description

technical field [0001] The invention relates to a method for manufacturing an electrode foil for a capacitor, and is especially suitable for a method for manufacturing an electrode foil for a medium-high voltage aluminum electrolytic capacitor. Background technique [0002] Prior to this, the manufacturing method of electrode foil for medium and high voltage aluminum electrolytic capacitors was as follows: take aluminum foil with a purity of 99.99%, oxidize it in an aqueous solution of 25-45% sulfuric acid and 4-10% hydrochloric acid or 4-8% hydrogen Sodium aqueous solution, soak for 60-180 seconds at 30-90°C, take it out and place it in an aqueous solution of 25-45% sulfuric acid and 4-10% hydrochloric acid, at 60-90°C, the current density is 0.15-0.70A / Under the condition of (cm)2, the first-order corrosion takes 80-150 seconds; after taking it out, it is washed with tap water, and then rinsed in 2-6wt% nitric acid solution for 40-120 seconds. After taking it out, use an...

Claims

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Application Information

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IPC IPC(8): H01G9/055H01G9/045
CPCH01G9/045H01G9/055
Inventor 陈小峰朱鸿伟
Owner NANTONG HAIXING ELECTRONICS
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