CN101211696A - Electrolytic capacitor low impedance anode aluminum foil erosion method and its chemical processing fluid - Google Patents
Electrolytic capacitor low impedance anode aluminum foil erosion method and its chemical processing fluid Download PDFInfo
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- CN101211696A CN101211696A CN 200610201482 CN200610201482A CN101211696A CN 101211696 A CN101211696 A CN 101211696A CN 200610201482 CN200610201482 CN 200610201482 CN 200610201482 A CN200610201482 A CN 200610201482A CN 101211696 A CN101211696 A CN 101211696A
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Abstract
The invention relates to a method for corroding the low-impedance anode aluminum foil for electrolytic capacitor and the chemical pretreatment solutions. The method comprises the following steps: the first step of primary electrolytic corrosion, the second step of chemical treatment and the third step of secondary electrolytic corrosion; the chemical pretreatment solutions consist of 4.0N to 5.0N of hydrochlorides, 0.15N to 5.0N of sulfates, 0.05N to 0.15N of phosphoric acids, 0.01N to 0.05N of nitric acids and 1.0N to 2.0N of aluminium chlorides. The invention forms the uniformly distributed pits with larger clearances and passive films enduring the corrosion on the surface of the clean aluminium foil and then implements the expanding treatment, so the impendance of the obtained etching foil is outstandingly lowered and in particular the invention has outstanding effects on the electrode foil with a voltage ranging from 50 to 100V. The use of the method controls the size, distribution and clearance of the pits to a certain extent, improves the corrosion morphology and increases the clearance of the pits and distribution uniformity so as to lower the impedance of the anode foil. The invention is suitable for the corrosion of the low-voltage aluminium foil with a voltage ranging from 25V to 100V, can lower the impedance of the anode foil by a great amount and can be used for preparing the low-impedance electrolytic capacitor anode aluminium foil.
Description
Technical field
The present invention relates to the corrosion technology field to anode foil for aluminum electrolytic capacitor, is a kind of electrolytic capacitor low impedance anode aluminum foil erosion method and chemical processing fluid thereof.
Background technology
Anode foils is the main production raw material of producing aluminium electrolytic capacitor, and its quality directly influences the performance of capacitor.Low-impedance capacitor has become a main direction of capacitor development.The quality level of domestic anode foils manufacturing company is also lower, is example with the product of 132V specification, and impedance can only be accomplished 1.2m Ω.Compare with external like product, also have sizable gap.
The erosion profile of anode foils and the size of its impedance have close ties.The impedance that reduces anode foils has three kinds of approach: (1) increases aluminum content in the aluminium foil corrosion layer; (2) reduce the local aggregation extent of pit, improve the even distributivity of pit; (3) increase the pit spacing.
At present, thereby mainly adopt the method that reduces electrochemical corrosion processing time increase etched foil weight to reduce impedance, promptly increase aluminum content in the aluminium foil corrosion layer low-voltage anode foil.Domestic existing two stages that often are divided into of electrochemical corrosion aluminium foil: (1) sends out hole: aluminium foil is immersed in adds the fault location generation spot corrosion of certain current density (direct current or alternating current) at aluminium foil surface in the acid solution that contains chloride ion, generate corrosion starting point or hole; (2) reaming: aluminium foil is immersed in adds certain current density (direct current or alternating current) in the solution that contains hydrochloric acid, sulfuric acid and impel agent, enlarge the pit radius in aluminium foil surface spot corrosion place; Galvanic corrosion technology commonly used has direct current to add interchange, exchange to add interchange, or direct current adds direct current.But, its electrode foil product exist local pit too much, problem such as skewness, pit spacing be less than normal.
Summary of the invention
The invention provides a kind of electrolytic capacitor low impedance anode aluminum foil erosion method and chemical processing fluid thereof, overcome the deficiency of prior art, realized the impedance of reduction anode foils.
One of technical scheme of invention is achieved like this: a kind of electrolytic capacitor low impedance anode aluminum foil erosion method, and it is undertaken by following step:
A galvanic corrosion of first step: the aluminium foil of oil removing clean is immersed in the electrolyte of acid and aluminium salt, adds certain electric field, carry out electrochemical corrosion, form one deck passivating film at aluminium foil surface, wherein:
Electrolyte prescription: hydrochloric acid 3.0N to 4.0N; Sulfuric acid 0.05N to 0.3N, phosphoric acid 0.02N to 0.15N, aluminium chloride 1.0N to 2.0N;
Condition: alternating current: 0.2 peace/square centimeter is to 1.0 peace/square centimeters; Temperature: 35 ℃ to 50 ℃; Processing time: 10s to 1min;
Second step chemical is handled: on passivating film, form evenly some pit group, wherein:
Prescription for the treatment of liquid: hydrochloric acid 4.0N to 5.0N; Sulfuric acid 0.15N to 0.4N, phosphoric acid 0.05N to 0.15N, nitric acid: 0.01N to 0.05N, aluminium chloride 1.0N to 2.0N;
Condition: temperature: 50 ℃ to 70 ℃; Processing time: 2min to 8min;
The galvanic corrosion of third step secondary: the aluminium foil that will form some pits in electrolyte adds alternating current and corrodes expansion face, further sends out the hole and enlarges hole, increases the effective surface area of paper tinsel, obtains needed electrolytic capacitor low impedance anode aluminum foil, wherein,
Electrolyte prescription: hydrochloric acid 4.0N to 6.0N; Sulfuric acid 0.05N to 0.5N erosion agent; Phosphoric acid 0.05N to 0.25N; Nitric acid 0.01N to 0.05N; Aluminium chloride 1.0N to 2.0N; Oxalic acid 10g/L to 30g/L; Copper chloride 0 is to 5ppm; Iron chloride 5ppm to 40ppm; Thiocarbamide 0.15g/L to 3.0g/L;
Condition: alternating current: 0.5 peace/square centimeter is to 10 peace/square centimeters; Time: 10min to 25min; Temperature: 30 ℃ to 45 ℃.
Two of technical scheme of the present invention is achieved like this: a kind of chemical processing fluid that is used for electrolytic capacitor low impedance anode aluminum foil erosion method, and its prescription is: hydrochloric acid 4.0N to 5.0N; Sulfuric acid 0.15N to 0.4N, phosphoric acid 0.05N to 0.15N, nitric acid: 0.01N to 0.05N, aluminium chloride 1.0N to 2.0N.
The present invention has following characteristics: the present invention forms bigger pit of even distribution, spacing and the anti-flat passivating film of corrosion of cutting at clean aluminium foil surface, carrying out reaming then handles, thus obtained etched foil impedance obviously reduces, and especially the electrode foil effect to 50～100V is remarkable.Controlled size, distribution and the spacing of pit to a certain extent with the method, improved erosion profile, increased pit spacing and distributing homogeneity, thereby reduced the anode foils impedance.The present invention is applicable to that the 25V～corrosion of 100V low pressure aluminum electric pole foil can reduce the impedance of anode foils significantly, can prepare the Low ESR anode aluminum foil of electrolytic capacitor.
Embodiment
The present invention is not subjected to the restriction of following embodiment, can determine concrete execution mode according to the technical scheme and the actual conditions of the invention described above.
Below in conjunction with embodiment the present invention is done further argumentation:
This electrolytic capacitor low impedance anode aluminum foil erosion method is undertaken by following step:
A galvanic corrosion of first step: the aluminium foil of oil removing clean is immersed in the electrolyte of acid and aluminium salt, adds certain electric field, carry out electrochemical corrosion, form one deck passivating film at aluminium foil surface, wherein:
Electrolyte prescription: hydrochloric acid 3.0N or 4.0N; Sulfuric acid 0.05N or 0.3N, phosphoric acid 0.02N or 0.15N, aluminium chloride 1.0N or 2.0N;
Condition: alternating current: 0.2 peace/square centimeter or 1.0 peace/square centimeters; Temperature: 35 ℃ or 50 ℃; Processing time: 10s or 1min;
Second step chemical is handled: on passivating film, form evenly some pit group, wherein:
Prescription for the treatment of liquid: hydrochloric acid 4.0N or 5.0N; Sulfuric acid 0.15N or 0.4N, phosphoric acid 0.05N or 0.15N, nitric acid: 0.01N or 0.05N, aluminium chloride 1.0N or 2.0N;
Condition: temperature: 50 ℃ or 70 ℃; Processing time: 2min or 8min;
The galvanic corrosion of third step secondary: the aluminium foil that will form some pits in electrolyte adds alternating current and corrodes expansion face, further sends out the hole and enlarges hole, increases the effective surface area of paper tinsel, obtains needed electrolytic capacitor low impedance anode aluminum foil, wherein,
Electrolyte prescription: hydrochloric acid 4.0N or 6.0N; Sulfuric acid 0.05N or 0.5N erosion agent; Phosphoric acid 0.05N or 0.25N; Nitric acid 0.01N or 0.05N; Aluminium chloride 1.0N or 2.0N; Oxalic acid 10g/L or 30g/L; Copper chloride 0 or 5ppm; Iron chloride 5ppm or to 40ppm; Thiocarbamide 0.15g/L or 3.0g/L;
Condition: alternating current: 0.5 peace/square centimeter or 10 peace/square centimeters; Time: 10min or 25min; Temperature: 30 ℃ or 45 ℃.
This prescription that is used for the chemical processing fluid of electrolytic capacitor low impedance anode aluminum foil erosion method is:
Hydrochloric acid 4.0N or 5.0N; Sulfuric acid 0.15N or 0.4N, phosphoric acid 0.05N or 0.15N, nitric acid: 0.01N or 0.05N, aluminium chloride 1.0N or 2.0N;
The product measurement of the foregoing description gained electrode foil 132V specification is learnt that its impedance only is 0.8m Ω, and this impedance 1.2m Ω than the same specification electrode foil of existing traditional handicraft preparation is much lower.
Claims (2)
1. electrolytic capacitor low impedance anode aluminum foil erosion method is characterized in that being undertaken by following step:
A galvanic corrosion of first step: the aluminium foil of oil removing clean is immersed in the electrolyte of acid and aluminium salt, adds certain electric field, carry out electrochemical corrosion, form one deck passivating film at aluminium foil surface, wherein:
Electrolyte prescription: hydrochloric acid 3.0N to 4.0N; Sulfuric acid 0.05N to 0.3N, phosphoric acid 0.02N to 0.15N, aluminium chloride 1.0N to 2.0N;
Condition: alternating current: 0.2 peace/square centimeter is to 1.0 peace/square centimeters; Temperature: 35 ℃ to 50 ℃; Processing time: 10s to 1min;
Second step chemical is handled: on passivating film, form evenly some pit group, wherein:
Prescription for the treatment of liquid: hydrochloric acid 4.0N to 5.0N; Sulfuric acid 0.15N to 0.4N, phosphoric acid 0.05N to 0.15N, nitric acid: 0.01N to 0.05N, aluminium chloride 1.0N to 2.0N;
Condition: temperature: 50 ℃ to 70 ℃; Processing time: 2min to 8min;
The galvanic corrosion of third step secondary: the aluminium foil that will form some pits in electrolyte adds alternating current and corrodes expansion face, further sends out the hole and enlarges hole, increases the effective surface area of paper tinsel, obtains needed electrolytic capacitor low impedance anode aluminum foil, wherein,
Electrolyte prescription: hydrochloric acid 4.0N to 6.0N; Sulfuric acid 0.05N to 0.5N erosion agent; Phosphoric acid 0.05N to 0.25N; Nitric acid 0.01N to 0.05N; Aluminium chloride 1.0N to 2.0N; Oxalic acid 10g/L to 30g/L; Copper chloride 0 is to 5ppm; Iron chloride 5ppm to 40ppm; Thiocarbamide 0.15g/L to 3.0g/L;
Condition: alternating current: 0.5 peace/square centimeter is to 10 peace/square centimeters; Time: 10min to 25min; Temperature: 30 ℃ to 45 ℃.
2. a chemical processing fluid that is used for electrolytic capacitor low impedance anode aluminum foil erosion method is characterized in that this chemical processing fluid prescription is: hydrochloric acid 4.0N to 5.0N; Sulfuric acid 0.15N to 0.4N, phosphoric acid 0.05N to 0.15N, nitric acid: 0.01N to 0.05N, aluminium chloride 1.0N to 2.0N.
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Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101950688A (en) * | 2010-11-04 | 2011-01-19 | 南通华冠电子科技有限公司 | Method for manufacturing medium and high-voltage anode aluminum foil for aluminum electrolytic capacitor |
| CN101964256A (en) * | 2010-11-04 | 2011-02-02 | 南通华冠电子科技有限公司 | Method for manufacturing medium and high-voltage anodic aluminum foil |
| CN103276435A (en) * | 2013-05-21 | 2013-09-04 | 东莞劲胜精密组件股份有限公司 | Micro-nano processing method for aluminum/aluminum alloy surface and aluminum/ aluminum alloy structure |
| CN104630871A (en) * | 2015-01-13 | 2015-05-20 | 肇庆华锋电子铝箔股份有限公司 | Corrosion process of low-voltage hard high-specific capacitance aluminum electrode foil |
| CN105957717A (en) * | 2016-05-26 | 2016-09-21 | 乳源县立东电子科技有限公司 | Multi-stage multi-time pitting method for middle high voltage anode foil |
| CN106981367A (en) * | 2017-04-18 | 2017-07-25 | 扬州宏远电子有限公司 | The follow-on solid-state capacitor electrode aluminium foil processing method of one kind post processing |
| CN107740177A (en) * | 2017-10-09 | 2018-02-27 | 山西沃特海默新材料科技股份有限公司 | A kind of electrochemical heat corrosion preparation method of micropore battery aluminium foil |
| CN111519239A (en) * | 2020-05-18 | 2020-08-11 | 南通海星电子股份有限公司 | Etching method for ultrahigh-pressure etched foil |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN1834295A (en) * | 2005-03-18 | 2006-09-20 | 新疆众和股份有限公司 | Method of preparing electrolytic condenser high specific volume anode aluminum foil |
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2006
- 2006-12-30 CN CN 200610201482 patent/CN101211696B/en not_active Expired - Fee Related
Cited By (12)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101950688A (en) * | 2010-11-04 | 2011-01-19 | 南通华冠电子科技有限公司 | Method for manufacturing medium and high-voltage anode aluminum foil for aluminum electrolytic capacitor |
| CN101964256A (en) * | 2010-11-04 | 2011-02-02 | 南通华冠电子科技有限公司 | Method for manufacturing medium and high-voltage anodic aluminum foil |
| CN103276435A (en) * | 2013-05-21 | 2013-09-04 | 东莞劲胜精密组件股份有限公司 | Micro-nano processing method for aluminum/aluminum alloy surface and aluminum/ aluminum alloy structure |
| CN103276435B (en) * | 2013-05-21 | 2014-08-06 | 东莞劲胜精密组件股份有限公司 | Micro-nano processing method for aluminum/aluminum alloy surface and aluminum/ aluminum alloy structure |
| WO2014187049A1 (en) * | 2013-05-21 | 2014-11-27 | 东莞劲胜精密组件股份有限公司 | Micro-nano processing method for aluminum or aluminum alloy surface, and aluminum or aluminum alloy structure |
| CN104630871A (en) * | 2015-01-13 | 2015-05-20 | 肇庆华锋电子铝箔股份有限公司 | Corrosion process of low-voltage hard high-specific capacitance aluminum electrode foil |
| CN105957717A (en) * | 2016-05-26 | 2016-09-21 | 乳源县立东电子科技有限公司 | Multi-stage multi-time pitting method for middle high voltage anode foil |
| CN105957717B (en) * | 2016-05-26 | 2018-11-30 | 乳源县立东电子科技有限公司 | The multiple hair engaging aperture method of the multistage of mesohigh anode foils |
| CN106981367A (en) * | 2017-04-18 | 2017-07-25 | 扬州宏远电子有限公司 | The follow-on solid-state capacitor electrode aluminium foil processing method of one kind post processing |
| CN107740177A (en) * | 2017-10-09 | 2018-02-27 | 山西沃特海默新材料科技股份有限公司 | A kind of electrochemical heat corrosion preparation method of micropore battery aluminium foil |
| CN111519239A (en) * | 2020-05-18 | 2020-08-11 | 南通海星电子股份有限公司 | Etching method for ultrahigh-pressure etched foil |
| CN111519239B (en) * | 2020-05-18 | 2021-12-07 | 南通海星电子股份有限公司 | Etching method for ultrahigh-pressure etched foil |
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