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Dual-section current waveform corrosion method for improving length consistency of channel holes of medium and high voltage anode aluminum foil

A technology of current waveform and anode aluminum foil, which is applied in the direction of circuits, capacitors, electrical components, etc., can solve the problems of uneven length of tunnel holes and hinder the improvement of specific capacitance of aluminum foil, and achieve the effect of improving consistency

Active Publication Date: 2014-04-23
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] Aiming at the problem that the length of the tunnel holes generated by the existing medium and high voltage aluminum foil corrosion technology is uneven, which seriously hinders the improvement of the specific capacitance of the aluminum foil, the invention invents a method according to the growth dynamics of the tunnel holes and the passivation current density of the aluminum foil with holes. The parameters of the attenuation current waveform, the pitting corrosion technology that significantly improves the length consistency of the tunnel hole

Method used

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  • Dual-section current waveform corrosion method for improving length consistency of channel holes of medium and high voltage anode aluminum foil
  • Dual-section current waveform corrosion method for improving length consistency of channel holes of medium and high voltage anode aluminum foil
  • Dual-section current waveform corrosion method for improving length consistency of channel holes of medium and high voltage anode aluminum foil

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Embodiment 1

[0033] According to the basic growth law and passivation current density of tunnel holes in the pitting corrosion system at the same temperature as in Comparative Example 1, two stages of attenuation current waveforms are obtained to improve the consistency of tunnel hole lengths. The first stage waveform is a constant current waveform, and the corrosion time The second stage waveform is an exponential decay waveform, the corrosion time is 25s, and the lowest current density at the end is 50mA cm -2 . After the aluminum foil was subjected to the same pretreatment as that of Comparative Example 1, the current waveform was used for pitting corrosion, and the charge density was 25C cm -2 , and then carry out the same hole expansion corrosion, post-treatment and 520V chemical conversion treatment as in Comparative Example 1.

Embodiment 2

[0035] According to the basic growth law and passivation current density of the tunnel hole in the pitting corrosion system at the same temperature as in Comparative Example 1, two stages of attenuation current waveforms are obtained to improve the consistency of the tunnel hole length. The first stage waveform is a small-amplitude linear decay current waveform , the corrosion time is 60s, the waveform of the second stage is an exponential decay waveform, the corrosion time is 25s, and the minimum current density at the end is 50mA cm -2 . After the aluminum foil was subjected to the same pretreatment as that of Comparative Example 1, the current waveform was used for pitting corrosion, and the charge density was 25C cm -2 , and then carry out the same hole expansion corrosion, post-treatment and 520V chemical conversion treatment as in Comparative Example 1.

Embodiment 3

[0037] According to the basic growth law and passivation current density of tunnel holes in the pitting corrosion system at the same temperature as in Comparative Example 1, two stages of attenuation current waveforms are obtained to improve the consistency of tunnel hole lengths. The first stage waveform is a constant current waveform, and the corrosion time 60s, the waveform of the second stage is a linear attenuation waveform, the corrosion time is 25s, and the lowest current density at the end is 50mA cm -2 . After the aluminum foil was subjected to the same pretreatment as that of Comparative Example 1, the current waveform was used for pitting corrosion, and the charge density was 25C cm -2 , and then carry out the same hole expansion corrosion, post-treatment and 520V chemical conversion treatment as in Comparative Example 1.

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Abstract

A dual-section current waveform corrosion method for improving the length consistency of channel holes of a medium and high voltage anode aluminum foil comprises the following steps of corroding the aluminum foil by adopting two sections of current waveforms: at the first stage, adopting a constant current or a small-amplitude linear attenuation current to enable the aluminum to generate the channel holes with the needed density, and at the second stage, adopting a linear or exponent form attenuation current waveform to enable the channel holes generated at the first stage to continuously grow to achieve or approach the limit length without generating new channel holes, wherein the corrosion time, the lowest corrosion current density and the current attenuation waveform of the second stage are determined by testing the growth kinetic curve of the channel holes of the aluminum foil in a corrosion solution and the maximum anode passivating current density of the hole generating aluminum foil. According to the dual-section current waveform corrosion method for improving the length consistency of the channel holes of the medium and high voltage anode aluminum foil, the length consistency of the channel holes can be obviously improved, the hole combining phenomenon of the channel holes and corrosion thinning are reduced, and the specific capacitance and the bending resistance of the medium and high voltage aluminum foil are improved.

Description

technical field [0001] The invention relates to the technical field of anode foil corrosion for aluminum electrolytic capacitors, in particular to a two-stage current waveform corrosion method for improving the consistency of tunnel hole lengths of medium and high voltage anode aluminum foils. 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. The electrolytic corrosion process of medium and high pressure aluminum foil generally includes pretreatment, hole corrosion, hole expansion corrosion, and posttreatment. The main function of pretreatment is to remove oil, impurities and oxide film on the surface of the light foil, improve the surface condition, and promote ...

Claims

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Application Information

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IPC IPC(8): H01G9/055
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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