Aluminum foil corrosion technique for electrolytic capacitor

An electrolytic capacitor and process technology, applied in the direction of electrolytic capacitors, capacitors, circuits, etc., can solve the problems of small surface contact area of ​​foil, high contact resistance, reduced electrical performance of aluminum electrolytic capacitors, etc., to improve electrical performance, reduce contact resistance, The effect of protecting the uncorroded part

Inactive Publication Date: 2009-08-12
日丰(清远)电子有限公司 +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

This new method described in this patents allows for better protection against corrodes caused by acidic environments compared to previous methods that had only one type of treatment. It also has several technical benefits such as improved conductivity or reduced impedance when exposed to different types of acids without causing damage due to overall it provides an efficient way to create strong materials suitable for use in electronic devices like lamps.

Problems solved by technology

This patented technical problem addressed in this patents relates to improving the efficiency at manufacturing highly functional tantalium oxynaphosphate (TaON) type ceramic materials that can be applied to electronics devices like those described above. Specifically, it focuses on finding ways to improve their properties without sacrificializing them or adding extra steps needed when creating these materials.

Method used

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  • Aluminum foil corrosion technique for electrolytic capacitor
  • Aluminum foil corrosion technique for electrolytic capacitor

Examples

Experimental program
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Effect test

Embodiment 1

[0013] Take an aluminum foil with a thickness of 105 μm and perform the following treatments in sequence:

[0014] After adopting the method described in patent application 200810066667.6 to carry out pretreatment, AC pre-corrosion and intermediate corrosion treatment on aluminum foil, follow the steps below for subsequent corrosion treatment:

[0015] (1) Dip the aluminum foil into a mixture of 22wt% hydrochloric acid, 0.15wt% sulfuric acid, 0.35wt% oxalic acid and 2.5wt% aluminum trichloride at a temperature of 40°C and a corrosion current density of 4A / dm 2 , power frequency is 20Hz, electricity is 480C / dm 2 , which is the first-level AC deep corrosion;

[0016] (2) Carry out the first level chemical corrosion in the aluminum foil after the treatment of step (1) in the mixed solution of 20wt% hydrochloric acid, 0.1wt% sulfuric acid, 0.1ppm cupric chloride, 2wt% aluminum chloride, the temperature is 60°C, treatment time 1 minute;

[0017] (3) Carry out the second-stage AC...

Embodiment 2

[0030] Using the same aluminum foil as in Example 1, it was etched. The process and process conditions were basically the same as in Example 1, only the frequency of the power supply in the AC deep etching process was adjusted to 30 Hz. The aluminum foil treated above is subjected to the usual post-treatment, and then the performance of the corroded foil is tested. Inspection condition is also identical with embodiment 1, records that its specific volume is 77.2 μ F / cm 2 , the weight loss is 1.09g / dm 2 , the tensile strength is 22.3N / cm, and the number of bending resistance is 89 times. Observing the scanning electron microscope image of the corroded foil, the surface hole morphology is rectangular, and the corrosion develops vertically in the depth direction. The test results show that the specific volume can be increased by 10% while keeping the mechanical properties of the aluminum foil basically unchanged.

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Abstract

The invention relates to an aluminum foil corrosion process for an electrolytic capacitor. The process comprises the following steps: preliminary treatment, AC pre-corrosion, intermediate treatment, subsequent corrosion and post-treatment. The process is characterized in that: the subsequent corrosion adopts a process of alternating multilevel low frequency AC corrosion and chemical corrosion; the adopted AC frequency is less than or equal to 30 Hz; the chemical corrosion is adopted after each level of AC corrosion; and the number of levels is usually 2 to 4. The aluminum foil corroded by the process has a square structured pore shape, less surface dissolution, and a specific volume improved by more than or equal to 10 percent. The process improves the corrosion efficiency and the face extension rate.

Description

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Claims

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Application Information

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Owner 日丰(清远)电子有限公司
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