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Corrosion process of low-voltage hard high-specific capacitance aluminum electrode foil

A technology of aluminum electrode foil and process method, which is applied in the field of aluminum foil manufacturing, can solve the problems of large investment in variable frequency power supply equipment, large AC waveform distortion, and high requirements for the use environment, and achieve low equipment investment, high performance specific volume, and low operation and maintenance costs Effect

Active Publication Date: 2015-05-20
GUANGDONG HUAFENG NEW ENERGY TECH CO LTD +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] In the power frequency corrosion technology, although the power frequency power supply used is simple in structure, it also has the problems of poor control accuracy and large AC waveform distortion. Because of the waveform distortion, it is not easy to obtain a high specific volume for the product electrode aluminum foil
In the frequency conversion corrosion technology, the equipment investment of the frequency conversion power supply used is large, and the requirements for the use environment are high, resulting in high product costs.
In addition, in the multi-stage corrosion process, the power frequency selection, current density, and temperature setting of each stage require a very close cooperation between the front and back stages, and the applicable process conditions are relatively narrow.
In the environment of fierce competition in the market, it is unwise to invest too much equipment costs, and the follow-up maintenance costs are also quite huge, but the stability and advancement of industrial frequency power supply and corrosion technology products are difficult to meet the needs of customers. There is still a small amount of room in the cost

Method used

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  • Corrosion process of low-voltage hard high-specific capacitance aluminum electrode foil

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Embodiment 1

[0027] A method for etching a low-pressure hard high-volume aluminum electrode foil, comprising the following steps:

[0028] 1. Spotting corrosion: first soak the domestic 95μm hard light foil after degreasing treatment in the spotting corrosion liquid for 45 seconds, and then apply a current density of 0.3A / cm2 for 16 seconds. The composition of the spotting corrosion liquid is 18wt% hydrochloric acid, 0.8wt% sulfuric acid, the temperature is maintained at 40°C;

[0029] 2. Deep hole expansion corrosion: Deep corrosion is carried out on the basis of pitting corrosion in the previous process. With the expansion of corrosion pits, the main components of the corrosion liquid are 20wt% hydrochloric acid, 1.2wt% sulfuric acid, and 6g / L oxalic acid is added , 300mg / L thiourea, 150mg / L ferric chloride, the temperature is maintained at 33°C, and an average current density of 0.15A / cm2 is applied during the electrification process, and the action time is 360 seconds;

[0030] 3. New...

Embodiment 2

[0033] A method for etching a low-pressure hard high-volume aluminum electrode foil, comprising the following steps:

[0034] 1. Spotting corrosion: first soak the domestic 95μm hard light foil after degreasing treatment in the spotting corrosion liquid for 30 seconds, and then apply a current density of 0.3A / cm2 for 12 seconds. The composition of the spotting corrosion liquid is 18wt% hydrochloric acid, 0.8wt% sulfuric acid, the temperature is maintained at 35°C;

[0035]2. Deep hole expansion corrosion: Deep corrosion is carried out on the basis of pitting corrosion in the previous process. With the expansion of corrosion pits, the main components of the corrosion liquid are 20wt% hydrochloric acid, 1.2wt% sulfuric acid, and 6g / L oxalic acid is added , 300mg / L thiourea, 150mg / L ferric chloride, the temperature is maintained at 30°C, and an average current density of 0.15A / cm2 is applied during the power-on process, and the action time is 300 seconds;

[0036] 3. New hole co...

Embodiment 3

[0039] A method for etching a low-pressure hard high-volume aluminum electrode foil, comprising the following steps:

[0040] 1. Spotting corrosion: first soak the domestic 95μm hard light foil after degreasing treatment in the spotting corrosion liquid for 60 seconds, and then apply a current density of 0.3A / cm2 for 20 seconds. The composition of the spotting corrosion liquid is 18wt% hydrochloric acid, 0.8wt% sulfuric acid, the temperature is maintained at 45°C;

[0041] 2. Deep hole expansion corrosion: Deep corrosion is carried out on the basis of pitting corrosion in the previous process. With the expansion of corrosion pits, the main components of the corrosion liquid are 20wt% hydrochloric acid, 1.2wt% sulfuric acid, and 6g / L oxalic acid is added , 300mg / L thiourea, 150mg / L ferric chloride, the temperature is maintained at 35°C, and an average current density of 0.15A / cm2 is applied during the electrification process, and the action time is 400 seconds;

[0042] 3. New...

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Abstract

The invention relates to a corrosion process of a low-voltage hard high-specific capacitance aluminum electrode foil and belongs to the technical field of aluminum foil manufacturing. According to the corrosion process, a constant-current fixed-frequency power source of the PWM control technology is adopted to provide electrochemical corrosion powder; the corrosion course of the low-voltage aluminum electrode foil is completed in three steps under different process conditions, namely point-distribution corrosion, deep hole-expanding corrosion and new hole corrosion; after the aluminum foil is corroded for three times, the low-voltage corroded electrode foil high in specific capacitance and excellent in property can be obtained; the corrosion volume of the electrode foil per square centimeter is within 10mg and the specific capacitance of the electrode foil is above 75 microfarads / cm<2>.

Description

technical field [0001] The invention relates to an corrosion process method of an aluminum electrode foil, in particular to a corrosion process method of a low-pressure hard high-specific volume aluminum electrode foil, and belongs to the technical field of aluminum foil manufacturing. Background technique [0002] In the family of electrolytic capacitors, aluminum electrolytic capacitors are high-performance, low-cost, and widely used basic components. They have been greatly developed in the world in the past 20 years and are widely used in household appliances, computers, communications, industrial controls, and electric vehicles. , Electric locomotives and military and aerospace equipment. For more than ten years, the production volume of global capacitors has continued to grow, while aluminum electrolytic capacitors have maintained their position of accounting for more than one-third of the entire capacitor market, and their annual growth rate has remained stable at 4-6%...

Claims

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Application Information

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IPC IPC(8): C25F3/04H01G9/055
Inventor 陈乾钧何海峰梁锦华钟思敏张泽权谭惠忠
Owner GUANGDONG HUAFENG NEW ENERGY TECH CO LTD