A pore corrosion method for controlling the length and consistency of tunnel holes in aluminum foil

A consistent and tunneling technology, applied in the direction of capacitors, circuits, electrical components, etc., can solve the problems of uneven length of tunnel holes, low production efficiency of single V corrosion in aluminum foil industry, hindering the improvement of specific capacitance of aluminum foil, etc., to achieve the improvement of production efficiency , The effect of specific capacitance improvement

Active Publication Date: 2019-01-04
新疆广投桂东电子科技有限公司
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  • Abstract
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  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0008] The purpose of the present invention is to provide a method for controlling aluminum foil tunnel holes in order to solve the problems that aluminum foils of different thicknesses need to form tunnel holes of different lengths, and the uneven length of the tunnel holes seriously hinders the improvement of the specific capacitance of aluminum foil and the low production efficiency of single V corrosion in the aluminum foil industry. The length and consistency of the on-off current waveform corrosion method, according to the basic growth law of the tunnel hole and the passivation current density to obtain the on-off decay current waveform to control the length of the aluminum foil tunnel hole and improve the length consistency, suitable for multi-V corrosion process

Method used

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  • A pore corrosion method for controlling the length and consistency of tunnel holes in aluminum foil
  • A pore corrosion method for controlling the length and consistency of tunnel holes in aluminum foil
  • A pore corrosion method for controlling the length and consistency of tunnel holes in aluminum foil

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Embodiment 1

[0029] The technological process of the on-off current waveform corrosion method for controlling the length and consistency of aluminum foil tunnel holes of the present invention includes: pretreatment, on-off attenuation current waveform hole corrosion, hole expansion corrosion, post-treatment and other steps. details as follows:

[0030] (1) Pretreatment: Soak an aluminum foil with a purity of 99.99%, a thickness of 120 μm, and a cubic texture occupancy of more than 95% in a mixed solution of 1M HCl+3.5M H2SO4 at a temperature of 80°C for 120s.

[0031](2) On-off decay current waveform porosity corrosion: When the required aluminum foil tunnel hole length is approximately 30 μm, place the pretreated aluminum foil in 0.8N HCl+0.8N A13++7.2N H2SO4 at a temperature of 72°C In the mixed solution, according to the basic growth curve and passivation current density of the tunnel hole in the pitting corrosion system at this temperature, an on-off parabolic decay current waveform is...

Embodiment 2

[0038] The difference from Example 1 is that in the on-off decaying current waveform porosity corrosion step of this example, when the required length of the aluminum foil tunnel hole is approximately 40 μm, the pretreated aluminum foil is placed in a 0.8N at a temperature of 72°C In the mixed solution of HCl+0.8N Al3++7.2N H2SO4, according to the basic growth curve and passivation current density of the tunnel hole in the pitting corrosion system at this temperature, the channel to control the length of the tunnel hole and improve the length consistency can be obtained. Broken parabolic decay current waveform. The number of on-off waveforms is 6, and the initial current density i0 is 600mA cm-2. Each power-on time is 15s, each power-off time is 15s, and the final corrosion current density is 50mA cm-2.

Embodiment 3

[0042] The difference from Example 1 is that in the on-off decaying current waveform pitting corrosion step of this example, when the required length of the tunnel hole of the aluminum foil is approximately 45 μm, the pretreated aluminum foil is placed in a 0.8N at a temperature of 72°C In the mixed solution of HCl+0.8N Al3++7.2N H2SO4, according to the basic growth curve and passivation current density of the tunnel hole in the pitting corrosion system at this temperature, the channel to control the length of the tunnel hole and improve the length consistency can be obtained. Broken parabolic decay current waveform. The number of on-off waveforms is 6, and the initial current density i0 is 650mA cm-2. Each power-on time is 20s, each power-off time is 20s, and the final corrosion current density is 50mA cm-2.

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Abstract

The invention discloses a hole-creating corrosion method for controlling a length and consistency of an aluminium foil tunnel hole. The method comprises steps of pretreatment, hoe-creating corrosion, hole-expanding corrosion, and post treatment. The invention mainly relates to the hole-creating corrosion technology. A tunnel hole growth kinetic curve of an aluminium foil in any hole-creating corrosion system and an anode maximum passivation current density of a hole-creating aluminium foil are tested; according to a needed tunnel hole length, corrosion time for each electrification, a lowest corrosion current density, and a current attenuation waveform are determined; and then an on-off hole-creating corrosion current waveform for controlling a length and consistency of a tunnel hole in a corresponding hole-creating corrosion system is obtained and electrifying corrosion is carried out by using the current waveform. According to the invention, the method is suitable for different hole-creating corrosion systems; corrosion in an aluminium foil can be carried out to obtain tunnel holes having different lengths and good length consistency. Meanwhile, tunnel holes with proper lengths can be formed according to aluminium foil corrosion with different thicknesses, so that the electrostatic specific volume of the aluminium foil can be improved effectively. The corrosion technology is suitable for a multi-V corrosion process; and compared with the one-time electrifying corrosion technology, the corrosion technology enables the production efficiency of the industrial aluminium foil corrosion to be improved obviously.

Description

technical field [0001] The invention relates to the technical field of anode foil corrosion for aluminum electrolytic capacitors, in particular to a pore corrosion method for controlling the length and consistency of aluminum foil tunnel holes. 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 practical and effective technical approach for the miniaturization of aluminum electrolytic capacitors. [0003] The electrolytic corrosion process of medium and high pressure aluminum foil generally includes 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 diameter and pore length) on the surface of ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01G9/055
CPCH01G9/055
Inventor 何业东梁力勃宋洪洲杨小飞蔡小宇
Owner 新疆广投桂东电子科技有限公司
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