A kind of etching method of ultra-high pressure etching foil

A technology of corroding foil and ultra-high pressure, which is applied in the field of electrolytic corrosion technology, can solve the problems of easy blockage of corrosion holes and small corrosion holes of anode foil, and achieve the effect of increasing the density of pores, increasing the diameter of holes, and increasing the density of pitting corrosion

Active Publication Date: 2021-12-07
NANTONG HAIXING ELECTRONICS +2
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The anode foil produced by this traditional corrosion process has small corrosion holes, and the corrosion holes are easy to be blocked during high-voltage formation. This requires research on large-aperture electrode foils to meet the needs.

Method used

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  • A kind of etching method of ultra-high pressure etching foil
  • A kind of etching method of ultra-high pressure etching foil

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0030] Primary pretreatment: use a mixture of 28wt% sulfuric acid and 4wt% hydrochloric acid, the temperature is 45°C, and the treatment time is controlled at 20 seconds.

[0031] Secondary pretreatment: use a mixture of 28wt% sulfuric acid and 4wt% hydrochloric acid, add 0.08g / L ferric chloride, the temperature is 55°C, and the AC frequency is 50HZ, 0.1A / cm 2 , 5s for initial pitting treatment.

[0032] Primary corrosion: use a mixture of 35 wt% sulfuric acid and 9 wt% hydrochloric acid, the temperature is 70 °C, and the intermittent pulse power-on mode is used for 7 times for electrolytic corrosion, and the power is cut off for 6 times. 8s, using direct current. Pulse power-on mode: first power on for 6s to attenuate the current density from 1.4A / cm2 to 0.6A / cm2, and then power on for 12s to attenuate the current density from 0.6A / cm2 to 0.02A / cm2.

[0033] Secondary corrosion: The corrosion solution is 9 wt% nitric acid and 0.1 g / L sodium polystyrene sulfonate, the temper...

Embodiment 2

[0036] Primary pretreatment: use a mixture of 30wt% sulfuric acid and 6wt% hydrochloric acid, the temperature is 45°C, and the treatment time is controlled at 20 seconds.

[0037] Secondary pretreatment: use a mixture of 30wt% sulfuric acid and 6wt% hydrochloric acid, add 0.06g / L ferric chloride, the temperature is 55℃, and the initial pitting corrosion treatment is carried out with an alternating current frequency of 80HZ, 0.06A / cm2, and 8s .

[0038] Primary corrosion: use a mixture of 35 wt% sulfuric acid and 9 wt% hydrochloric acid, the temperature is 70 °C, and the intermittent pulse power-on mode is used for 7 times for electrolytic corrosion, and the power is cut off for 6 times. 8s, using direct current. Pulse power-on mode: first power on for 7s to attenuate the current density from 1.3A / cm2 to 0.7A / cm2, and then power on for 11s to attenuate the current density from 0.7A / cm2 to 0.02A / cm2.

[0039] Secondary corrosion: The corrosion solution is 9 wt% nitric acid and...

Embodiment 3

[0042] Primary pretreatment: use a mixture of 28wt% sulfuric acid and 4wt% hydrochloric acid, the temperature is 45°C, and the treatment time is controlled at 20 seconds.

[0043] Secondary pretreatment: use 28wt% sulfuric acid and 4 wt% hydrochloric acid mixture, add 0.08g / L ferric chloride, the temperature is 55℃, and the initial pitting corrosion treatment is carried out with an alternating current frequency of 80HZ, 0.06A / cm2, 8s .

[0044] Primary corrosion: use a mixture of 35 wt% sulfuric acid and 9 wt% hydrochloric acid, the temperature is 70 °C, and the intermittent pulse power-on mode is used for 7 times for electrolytic corrosion, and the power is cut off for 6 times. 8s, using direct current. Pulse electrification mode: first add 8s to attenuate the current density from 1.3A / cm2 to 0.6A / cm2, and then charge for 10s to attenuate the current density from 0.6A / cm2 to 0.02A / cm2.

[0045] Secondary corrosion: The corrosion solution is 9 wt% nitric acid and 0.1 g / L sod...

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Abstract

A corrosion method for ultra-high pressure corroded foil, including: primary pretreatment: use 8-40 wt% sulfuric acid and 1-10 wt% hydrochloric acid mixture, the temperature is 20-50°C, and the treatment time is controlled at 10-30 second; secondary pretreatment: use 8‑40 wt% sulfuric acid and 1‑10 wt% hydrochloric acid mixture, add a small amount of ferric chloride, ferric chloride content is 0.01‑1g / L, temperature is 30‑60 ° C, Use frequency 50‑100HZ, low power, alternating current for initial pitting corrosion treatment; primary corrosion: use a mixture of 8‑40 wt% sulfuric acid and 1‑10 wt% hydrochloric acid at a temperature of 50‑80°C, using discontinuous Electrolytic corrosion was carried out in the pulse energization mode, and the power was cut off 6 times, each power-on time was 13-23s, and the power-off time was 8s, using direct current; secondary corrosion: the corrosion solution was 1-10 wt% nitric acid and corrosion inhibitor, and the temperature was 30- 80℃, using direct current, the current density is 0.05‑0.2A / cm 2 ;Post-treatment: use 1-10 wt% nitric acid, the temperature is 30-70°C, and the cleaning time is 1-5 minutes; then clean it with pure water, and then dry it in an oven at 100°C.

Description

technical field [0001] The invention relates to the field of electrolytic corrosion technology, in particular to a corrosion method for ultra-high pressure corrosion foil. Background technique [0002] Ultra-high voltage electrode foil can be used for capacitors with ultra-high voltage requirements and large specific capacity, which are required for medium and high voltage frequency converters, inverters, and communication power supplies. At present, the electrolytic corrosion process of medium and high pressure aluminum foil generally includes pretreatment, pore corrosion, hole expansion corrosion, and post-treatment. The specific process is as follows: first, place the aluminum foil in an alkaline or acidic pretreatment at 30-80°C and soak it for 20-90 seconds to remove oil stains, impurities and oxide film on the surface of the foil, improve the surface condition, and promote the pore corrosion of the aluminum foil in the next step. The hole forming process is to form an...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C25F3/04
CPCC25F3/04
Inventor 陈健王建中顾建萍冒慧敏
Owner NANTONG HAIXING ELECTRONICS
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