Preparation for producing aluminum electrolysis capacitor using ultrasonics

An aluminum electrolytic capacitor and ultrasonic technology, applied in electrolytic capacitors, cleaning methods using liquids, capacitors, etc., can solve the problems of loss of electrostatic capacity, low efficiency, incompatibility of electrostatic capacity and hydration resistance, etc. The effect of improving quality

Inactive Publication Date: 2009-05-06
DONGGUAN HEC CONDENSER CO LTD
View PDF0 Cites 16 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] However, chemical treatment also brings defects that cannot be ignored while improving product performance.
First, when the formation voltage reaches a higher value, the oxide film formed on the surface is thicker, and the phosphate radical cannot diffuse into the pores during conventional phosphoric acid treatment, which makes it difficult to fully and thoroughly cover the passivation treatment; secondly, conventional phosphoric acid treatment The treatment efficiency is low, and in order to achieve better results, the concentration and temperature are often increased, which will lose part of the electrostatic capacity, so that the electrostatic capacity and hydration resistance cannot be combined

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0022] Corrosion foil was used under high pressure and boiled in pure water for 12 minutes. The first-stage chemical formation was carried out at 85°C with 5.0wt% boric acid and 1.0wt% ammonium borate aqueous solution, and the current density was 20mA.cm -2 , when the voltage reaches 200V, the constant voltage is 8 minutes; then the second-stage formation is carried out at 85°C with 5wt% boric acid and 0.5wt% ammonium borate aqueous solution, and the current density is 20mA.cm -2 , when the voltage reaches 400V, the voltage is constant for 10 minutes; then the third-stage chemical formation is carried out at 85°C in a mixed solution of 5wt% boric acid and 0.15wt% ammonium borate aqueous solution, and the current density is 20mA.cm -2 , when the voltage reaches 520V, keep the voltage for 15 minutes; then carry out the fourth-stage formation at 85°C with 5wt% boric acid and 0.08wt% ammonium borate aqueous solution, and the current density is 20mA.cm -2 , When the voltage reache...

Embodiment 2

[0026] Use 99.8% low-pressure corrosion foil, boil in pure water for 6 minutes, carry out the first-stage and second-stage chemical formation in a 5wt% ammonium adipate solution at 75°C, and perform ultrasonic phosphoric acid passivation treatment after reaching a predetermined voltage of 20v. The phosphate concentration is 0.08mol / L, the pH value is 4.5, the treatment time is 1 minute, and the treatment temperature is 25°C. Then it is reformed in the above-mentioned ammonium adipate solution and heat treated at 500°C for 2 minutes.

Embodiment 3

[0030] Use 99.8% low-pressure corrosion foil, boil in pure water for 6 minutes, carry out the first-stage and second-stage chemical formation in 7wt% ammonium adipate solution at 85°C, and perform ultrasonic phosphoric acid passivation treatment after reaching the predetermined voltage of 80v. The phosphate concentration is 0.12mol / L, the pH value is 3.0, the treatment time is 50 seconds, and the treatment temperature is 35°C. Then it is reformed in the above-mentioned ammonium adipate solution and heat treated at 500°C for 2 minutes.

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

PUM

No PUM Login to View More

Abstract

The invention relates to the technical field of formed foil, in particular to a preparation method of an anode foil for aluminum electrolytic capacitors with ultrasonic wave. The preparation method comprises the following steps: boiling pure water, formation treatment, heat treatment, phosphoric acid passivation treatment with ultrasonic wave, reformation treatment and post-treatment, wherein the formed foil after heat treatment is subjected to phosphoric acid passivation treatment with ultrasonic wave in a phosphoric acid tank liquid. The technology cleans the foil after formation treatment with ultrasonic wave to remove the impurities in oxide film and air remaining in foil pores, and clean up unstable filam so as to remarkably improve the quality of the filam; and the phosphate can penetrate into the bottom of the foil pores under the action of ultrasonic wave to completely generate a phosphoric acid passive film in order to truly improve the quality of the filam and prolong the life of the filam.

Description

Technical field: [0001] The invention relates to the technical field of formed foils, in particular to a method for manufacturing anode foils of aluminum electrolytic capacitors by ultrasonic waves. Background technique: [0002] Electrolytic capacitors are widely used in many related industries such as electronics. The advancement of science and technology and the development of industry have put forward higher requirements for the electrical performance of electrolytic capacitors such as power frequency, low impedance, and long life. In order to achieve higher electrical performance of electrolytic capacitors, it is often necessary to use high-moisture electrolytes in capacitors. However, at high temperatures, the aluminum foil oxide film, especially the anode foil oxide film, will hydrate with moisture. Aluminum hydroxide is formed on the surface of the foil, which leads to a decrease in the withstand voltage of the anode foil and an increase in the leakage current. It m...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

Application Information

Patent Timeline
no application Login to View More
IPC IPC(8): H01G9/045H01G9/048C23C22/07B08B3/12
Inventor何凤荣李道重
OwnerDONGGUAN HEC CONDENSER CO LTD