Acid-mixed reaming corrosion method for high-voltage anode foil in aluminum electrolysis

A medium-high voltage, anode foil technology, applied in the direction of electrolytic capacitors, circuits, capacitors, etc., can solve the problem of excessive anode foil holes, etc., and achieve the effect of low cost, simple process and excellent quality of aluminum foil

Active Publication Date: 2018-09-14
新疆广投桂东电子科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] The purpose of the present invention is to overcome the problem of too large or too small holes in the anode foil in the prior art for hole expansion corrosion in a single acid system, and to provide a method for the mixed acid hole expansion corrosion of the anode foil in aluminum electrolysis

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  • Acid-mixed reaming corrosion method for high-voltage anode foil in aluminum electrolysis

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Embodiment 1

[0031] A method for hole-expanding corrosion of medium-voltage anode foil in aluminum electrolysis with mixed acid, comprising the following steps:

[0032] (1) Pre-treatment: put the soft aluminum foil with aluminum content ≥99.99%, {100} area occupancy ≥95.6%, and a thickness of 125 um in a solution containing 3% hydrochloric acid and 35% sulfuric acid at a temperature of 75°C. Soak in the mixed solution for 90 s;

[0033] (2) Primary porosity corrosion: Put the pretreated aluminum foil in a mixed solution containing 3% hydrochloric acid and 35% sulfuric acid by mass at a temperature of 80°C, and apply a current density of 600 mA / cm 2 The intermittent pulse current, the intermittent time is 8 s after power-on, 400 ms after power-off, and the total time for primary pitting corrosion is 80 s;

[0034] (3) Secondary pore expansion corrosion: Wash the aluminum foil after primary pore corrosion with pure water, put it in a mixed solution of hydrochloric acid and 2% nitric acid a...

Embodiment 2

[0041] A method for hole-expanding corrosion of medium-voltage anode foil in aluminum electrolysis with mixed acid, comprising the following steps:

[0042] (1) Pretreatment: Soak the soft aluminum foil with aluminum content ≥99.99%, {100} surface occupancy ≥95.6%, and thickness of 125 um in a hydrochloric acid solution containing 6% by mass at a temperature of 75°C for 120 s;

[0043] (2) Primary porosity corrosion: Put the pretreated aluminum foil in a mixed solution containing 5% hydrochloric acid and 30% sulfuric acid by mass at a temperature of 75-90°C, and apply a current density of 800 mA / cm 2 The intermittent pulse current, the intermittent time is 12 s when power is on, 600 ms when power is off, and the total time for primary pitting corrosion is 90 s;

[0044] (3) Secondary pore expansion corrosion: wash the aluminum foil after the primary pore corrosion with pure water, put it into a hydrochloric acid solution with a temperature of 84°C and a mass percentage of 5%,...

Embodiment 3

[0051] A method for hole-expanding corrosion of medium-voltage anode foil in aluminum electrolysis with mixed acid, comprising the following steps:

[0052] (1) Pre-treatment: put the soft aluminum foil with aluminum content ≥99.99%, {100} surface occupancy ≥95.6%, and a thickness of 125 um in a solution containing 2% hydrochloric acid and 35% sulfuric acid at a temperature of 65°C. Soak in the mixed solution for 30 s;

[0053] (2) Primary porosity corrosion: Put the pretreated aluminum foil in a mixed solution containing 1% hydrochloric acid and 50% sulfuric acid by mass at a temperature of 75°C, and apply a current density of 1000 mA / cm 2 The intermittent pulse current, the intermittent time is 2 s when power is on, 1000 ms when power is off, and the total time for primary pitting corrosion is 30 s;

[0054] (3) Secondary pore expansion corrosion: wash the aluminum foil after the primary pore corrosion with pure water, put it in a nitric acid solution with a temperature of ...

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Abstract

The invention relates to the technical field of anode foil corrosion for aluminum electrolytic capacitors, in particular to an acid-mixed reaming corrosion method for high-voltage anode foil in aluminum electrolysis. The method comprises six steps of pre-treatment, first-stage pitting corrosion, second-stage reaming corrosion, third-stage reaming corrosion, post-treatment and formation treatment,and is characterized in that the aluminum foil after the first-stage pitting corrosion is subjected to second-stage and third-stage acid-mixed reaming corrosion, respective characteristics of hydrochloric acid and nitric acid are fully utilized for common reaming, so that defects of single acid reaming corrosion can be overcome; 520 Vt specific volume of the aluminum foil is 0.750-0.799 uF/cm<2>,which is increased by 1.57%-3.03% than the specific volume of the aluminum foil in single acid reaming corrosion; 375 Vt specific volume is 1.265-1.293 uF/cm<2>, which is increased by 1.59%-3.60% thanthe specific volume of the aluminum foil in single acid reaming corrosion.

Description

technical field [0001] The invention relates to the technical field of anode foil corrosion for aluminum electrolytic capacitors, in particular to a method for hole-expanding corrosion of high-voltage anode foil in aluminum electrolysis with mixed acid. Background technique [0002] Aluminum electrolytic capacitors are the main electronic materials for basic components in the electronic information industry. Their quality directly affects the performance of capacitors, and the production process of aluminum electrolytic anode foil determines the performance level of anode foil. The main process of the corrosion foil manufacturing process is to place the aluminum foil in a specific corrosion solution for pre-etching, hole corrosion, hole expansion corrosion, pure chemical corrosion, etc. The purpose is to form a certain number of holes on the surface of the aluminum foil to This results in a larger surface area and thus a capacity of the anode foil. The most critical of thes...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01G9/055H01G9/00
CPCH01G9/00H01G9/055
Inventor 杨小飞刘继林熊传勇
Owner 新疆广投桂东电子科技有限公司
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