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A method for corroding low-voltage electrode foil of chip-type aluminum electrolytic capacitor

A technology of aluminum electrolytic capacitors and low-voltage electrodes, applied in electrolytic capacitors, capacitors, circuits, etc., can solve the problems of small hole self-corrosion, porous corrosion layer with different corrosion degrees, and no capacity, so as to avoid self-corrosion and accurate corrosion process The effect of controllable and emission reduction

Active Publication Date: 2020-09-22
NANTONG HAIXING ELECTRONICS +2
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Due to the differences in the content of impurity ions, grain boundaries, and dislocations contained in different positions of the light foil, the corrosion degree cannot be accurately controlled during the hole expansion corrosion process, and serious surface and Self-corrosion phenomenon in small holes, resulting in large corrosion depth at local locations, corroded small holes merged, etc.
In the actual production process, it is reflected in the large difference in corrosion depth, severe thinning and uneven thickness of residual core layer, uneven corrosion degree of porous corrosion layer, and uneven distribution and size of pores, resulting in the capacity dispersion of electrode foil after formation. The risk of large difference, low bending strength, and high contact resistance will affect the yield rate of aluminum electrolytic capacitors in the production process
If it is used in a chip type (V-CHIP) aluminum electrolytic capacitor, it is very easy to have broken foil, no capacity, early failure, and short life of the capacitor during the production process, which restricts the chip type (V-CHIP) Mass Production Efficiency and Product Scale of Aluminum Electrolytic Capacitors

Method used

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  • A method for corroding low-voltage electrode foil of chip-type aluminum electrolytic capacitor
  • A method for corroding low-voltage electrode foil of chip-type aluminum electrolytic capacitor
  • A method for corroding low-voltage electrode foil of chip-type aluminum electrolytic capacitor

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0062] A. Soak the low-voltage anode foil in 5wt% hydrochloric acid, 0.1wt% sulfuric acid, 0.1wt% AlCl 3 In the mixed solution as pretreatment, the action conditions are: temperature 20°C, time 180 seconds;

[0063] B, the anode foil that step A obtains adopts 5wt% hydrochloric acid, 0.1wt% sulfuric acid, 0.1wt%AlCl 3 Corrosion treatment of energized porosity, the action conditions are: temperature 30°C, current density 0.4A / cm², current waveform frequency is non-sine wave 50 / 45 / 40 / 35Hz, time 20 seconds;

[0064] C, the anode foil that step B obtains adopts 5wt% hydrochloric acid, 0.1wt% sulfuric acid, 0.1wt%AlCl 3 Soaking as intermediate treatment, the action conditions are: temperature 30°C, time 20 seconds;

[0065] D, the anode foil obtained in step C is washed with pure water for 20 seconds;

[0066] E. Repeat steps B, C, and D 4 times;

[0067] F, the anode foil that step E obtains adopts 5wt% hydrochloric acid, 0.1wt% sulfuric acid, 0.1wt%AlCl 3 , 0.05wt% phosphori...

Embodiment 2

[0074] A. Soak the low-voltage anode foil in 7wt% hydrochloric acid, 0.5wt% sulfuric acid, 0.5wt% AlCl 3 In the mixed solution as pretreatment, the action conditions are: temperature 40°C, time 130 seconds;

[0075] B, the anode foil that step A obtains adopts 7wt% hydrochloric acid, 0.5wt% sulfuric acid, 0.5wt%AlCl 3 Corrosion treatment of energized porosity, the action conditions are: temperature 40 ℃, current density 0.6A / cm², current waveform frequency is non-sinusoidal wave 50 / 45 / 40 / 35Hz, time 45 seconds;

[0076] C, the anode foil that step B obtains adopts 7wt% hydrochloric acid, 0.5wt% sulfuric acid, 0.5wt%AlCl 3 Soaking as intermediate treatment, the action conditions are: temperature 40°C, time 45 seconds;

[0077] D, the anode foil obtained in step C is washed with pure water for 40 seconds;

[0078] E. Repeat steps B, C, and D 4 times;

[0079] F, the anode foil that step E obtains adopts 7wt% hydrochloric acid, 0.5wt% sulfuric acid, 0.5wt%AlCl 3 , 0.1wt% phos...

Embodiment 3

[0086] A. Soak the low-voltage anode foil in 9wt% hydrochloric acid, 0.8wt% sulfuric acid, 0.8wt% AlCl 3 In the mixed solution as pretreatment, the action conditions are: temperature 60°C, time 80 seconds;

[0087] B, the anode foil that step A obtains adopts 9wt% hydrochloric acid, 0.8wt% sulfuric acid, 0.8wt%AlCl 3 Corrosion treatment of energized porosity, the action conditions are: temperature 50 ℃, current density 0.8A / cm², current waveform frequency is non-sine wave 45 / 40 / 37.5 / 35Hz, time 70 seconds;

[0088] C, the anode foil that step B obtains adopts 9wt% hydrochloric acid, 0.8wt% sulfuric acid, 0.8wt%AlCl 3 Soaking as intermediate treatment, the action conditions are: temperature 50°C, time 70 seconds;

[0089] D, the anode foil obtained in step C is washed with pure water for 60 seconds;

[0090] E. Repeat steps B, C, and D 4 times;

[0091] F, the anode foil that step E obtains uses 9wt% hydrochloric acid, 0.8wt% sulfuric acid, 0.8wt%AlCl 3 , 0.6wt% phosphoric ...

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Abstract

The invention discloses a corrosion method for low-voltage electrode foil of a V-CHIP aluminum electrolytic capacitor. The corrosion method comprises the following steps that a mixed solution of hydrochloric acid, sulfuric acid and AlCl3 is adopted for soaking, and pretreatment is achieved; the hydrochloric acid, sulfuric acid and AlCl3 solution is electrified for hole generating corrosion; intermediate treatment is conducted on the hydrochloric acid, sulfuric acid and AlCl3 solution, and washing is conducted with pure water; the steps of hole generating corrosion, intermediate treatment and washing are repeated; reaming electrifying corrosion is conducted in corrosive liquid of hydrochloric acid, sulfuric acid, AlCl3, phosphoric acid and polystyrolsulfon acid or sodium polystyrenesulfonate, soaking is conducted with the hydrochloric acid, sulfuric acid, AlCl3 and phosphoric acid solution, washing is conducted with pure water, and the steps of reaming corrosion, soaking and washing arerepeated; and lastly, soaking is conducted by adopting a nitric acid solution, and annealing treatment is conducted after washing is conducted with the pure water. The corrosive aluminum foil produced through the corrosion method has the characteristics of being small in corrosion depth, good in mechanical property and low in contact resistance after being formed and is effectively suitable for being used for the capacitor with the minimum width of 2.2 mm in the manufacturing process of the V-CHIP capacitor.

Description

technical field [0001] The invention relates to a method for corroding a low-voltage electrode foil of a patch type aluminum electrolytic capacitor. Background technique [0002] The rapid development of electronic component integration and high-speed processing technology, the continuous innovation of mobile product miniaturization and high-performance technology, especially for aluminum electrolytic capacitors used in LED lighting, electronic power circuits, and vehicles. requirements. At the same time, due to the continuous improvement of the automation of production equipment and the cost of global human resources, the electronic component patching and automated production will become the trend and development direction of electronic manufacturing companies, and the chip (V-CHIP) aluminum electrolytic capacitor is The innovative application of ordinary aluminum electrolytic capacitors in patch production. [0003] The key to the chip-type (V-CHIP) aluminum electrolytic...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C25F3/04C23F1/20C23F11/173H01G9/055H01G9/045
CPCC23F1/20C23F11/173C25F3/04H01G9/045H01G9/055
Inventor 严季新陈健王建中周小兵于永王亚飞张智源赵宇飞吴骏钱琳灵
Owner NANTONG HAIXING ELECTRONICS