Power-up protection method of hole generating corrosion second half V cathode of middle-high voltage electronic aluminum foil

A technology of electronic aluminum foil and power-on protection, which is applied in the direction of electrolytic capacitors, circuits, capacitors, etc., can solve problems affecting the performance of aluminum foil, etc., and achieve the effect of low cost, thickness maintenance, and good indicators

Active Publication Date: 2018-11-06
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

The aluminum foil is in a state of high temperature and high acidity chemical corrosion in the second half of the V, which will cause re-porosity of the aluminum foil and strong corrosion reduction on the surface, which affects the further improvement of the performance of the aluminum foil

Method used

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  • Power-up protection method of hole generating corrosion second half V cathode of middle-high voltage electronic aluminum foil
  • Power-up protection method of hole generating corrosion second half V cathode of middle-high voltage electronic aluminum foil

Examples

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Effect test

Embodiment 1

[0032] A method for half-V cathodic power-on protection after hole corrosion of medium and high voltage electronic aluminum foil, comprising the following steps:

[0033] (1) Pretreatment: The aluminum foil is soaked in a mixed solution containing 3% hydrochloric acid and 35% sulfuric acid at a temperature of 80°C for 120 s;

[0034] (2) The first half V porosity corrosion of the first level: the aluminum foil after pretreatment enters the porosity corrosion solution at a temperature of 75 ° C, and the applied current density is 600 mA cm -2 The direct current is carried out porosity corrosion 80 s, and described porosity corrosion solution is the mixed solution that contains mass percent and is 3% hydrochloric acid and 35% sulfuric acid;

[0035] (3) Cathodic energization protection in the second half V of the first level: After the first half V is corroded, the aluminum foil enters the second half V, and the cathode is subjected to constant current protection treatment for 8...

Embodiment 2

[0041] A method for half-V cathodic power-on protection after hole corrosion of medium and high voltage electronic aluminum foil, comprising the following steps:

[0042] (1) Pretreatment: The aluminum foil is immersed in a mixed solution containing 5% hydrochloric acid and 30% sulfuric acid at a temperature of 75°C for 100 s;

[0043] (2) The first half V porosity corrosion of the first level: the aluminum foil after pretreatment enters the porosity corrosion solution at a temperature of 70°C, and the applied current density is 500 mA cm -2 The direct current is carried out porosity corrosion 120 s, and described porosity corrosion solution is the mixed solution that contains mass percent and is 5% hydrochloric acid and 30% sulfuric acid;

[0044] (3) Cathodic energization protection for the second half V of the first level: After the first half V is corroded, the aluminum foil enters the second half V, and the cathode is subjected to constant current protection treatment for...

Embodiment 3

[0050] A method for half-V cathodic power-on protection after hole corrosion of medium and high voltage electronic aluminum foil, comprising the following steps:

[0051] (1) Pretreatment: The aluminum foil is immersed in a mixed solution containing 5% hydrochloric acid and 30% sulfuric acid at a temperature of 85 °C for 60 s;

[0052] (2) The first half V porosity corrosion of the first level: the aluminum foil after pretreatment enters the porosity corrosion solution at a temperature of 80 °C, and the applied current density is 800 mA cm -2 The direct current is carried out porosity corrosion 60 s, and described porosity corrosion solution is to contain the mixed solution that mass percent is 5% hydrochloric acid and 30% sulfuric acid;

[0053] (3) Cathodic energization protection in the second half V of the first level: After the first half V is corroded, the aluminum foil enters the second half V, and the cathode is subjected to constant current protection treatment for 80...

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Abstract

Provided is a power-up protection method of a hole generating corrosion second half V cathode of middle-high voltage electronic aluminum foil. After the aluminum foil is subjected to pretreatment andfirst-stage first half V hole generating corrosion, first-stage second half V cathode power-up protection is carried out, and after the aluminum foil enters a second half V, the cathode is subjected to constant-current protection treatment for 30 s to 120 s until the aluminum foil exceeds the liquid surface of the second half V, wherein the current density ranges from 5 mA/cm<2> to 30 mA/cm<2>. According to the method, after first-stage hole generating corrosion, second half V cathode power-up protection is added, the hole regenerating and hole combining phenomena of the aluminum foil are obviously reduced, and the surface corrosion thinning thickness of the aluminum foil is reduced by 37.5% to 67.5% compared with a traditional method; and hole generating density, the aperture of generatedholes, the hole generating uniformity and other indexes are good and about 2% higher than those of aluminum foil obtained through the traditional method, the material and thickness of the foil are kept uniform, and the bending frequency is increased by 5-10 times compared with the traditional aluminum foil.

Description

technical field [0001] The invention relates to the technical field of formation of anode foils for aluminum electrolytic capacitors, in particular to a half-V cathode power-on protection method for medium and high voltage electronic aluminum foils after porosity corrosion. Background technique [0002] Miniaturization is an inevitable trend in the development of aluminum electrolytic capacitors. Electrolytic corrosion of high-purity aluminum foil with {100} texture to expand its specific surface area and increase specific capacitance is the most effective technical approach for the miniaturization of aluminum electrolytic capacitors. [0003] At present, the electrolytic corrosion process of medium and high pressure aluminum foil generally includes four main steps: pretreatment, hole corrosion, hole expansion corrosion, and posttreatment. The key to obtaining high specific capacitance is to form evenly distributed tunnel holes with high density and reasonable size (aperture...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C25F3/04C23F13/02H01G9/055
CPCC23F13/02C25F3/04H01G9/055
Inventor 杨小飞梁力勃蔡小宇
Owner 新疆广投桂东电子科技有限公司
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