CN101649458B - Method for reducing remaining copper on surface of cathode foil of aluminum electrolytic capacitor - Google Patents
Method for reducing remaining copper on surface of cathode foil of aluminum electrolytic capacitor Download PDFInfo
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- CN101649458B CN101649458B CN2009101155973A CN200910115597A CN101649458B CN 101649458 B CN101649458 B CN 101649458B CN 2009101155973 A CN2009101155973 A CN 2009101155973A CN 200910115597 A CN200910115597 A CN 200910115597A CN 101649458 B CN101649458 B CN 101649458B
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Abstract
The invention relates to a method for reducing remaining copper on the surface of a cathode foil of an aluminum electrolytic capacitor. The cathode foil is an etched copper-aluminum alloy foil. The method orderly comprises the following steps: (1) washing the cathode foil; (2) high-temperature treatment: roasting the cathode foil at 300-550 DEG C for 10-60 seconds; and (3) impregnating the cathode foil in a 4-10 wt% nitric acid solution at 35-45 DEG C for 60-120 seconds. An aluminum oxide film is firstly formed on the cathode foil by thermal oxidization, and the cathode foil is treated with the nitric acid solution to remove copper; due to the existence of the aluminum oxide film, the oxidization of the copper in the nitric acid solution is not affected by the corrosion of the aluminum soas to completely dissolve the copper; therefore, the method can effectively reduce the remaining copper on the surface of the cathode foil of the aluminum electrolytic capacitor.
Description
Technical field
The present invention relates to a kind of method that reduces remaining copper on surface of cathode foil of aluminum electrolytic capacitor.
Background technology
Aluminium electrolutic capacitor is the cathode aluminum foil that is connected by the anode aluminium foil of anode lead wire connection, cathode lead, and the centre is separated by electrolytic paper, dipping electrolytic solution after reeling, and upright through organizing again, aging sorting forms.Cathode Foil is one of main raw during aluminium electrolutic capacitor is produced, because domestic 2301 type Cathode Foil are that a kind of aluminum content is 99% aluminum-copper alloy paper tinsel, its paper tinsel surface after corroding will be adsorbed up to 30mg/m
2Cupric ion, have a strong impact on work-ing life of aluminium electrolutic capacitor.
Summary of the invention
Technical problem to be solved by this invention provides a kind of method that can effectively reduce remaining copper on surface of cathode foil of aluminum electrolytic capacitor.
For solving above technical problem, the following technical scheme that the present invention takes:
A kind of method that reduces remaining copper on surface of cathode foil for aluminum electrolytic capacitors, described Cathode Foil is process corrosive X alloy paper tinsel, this method in turn includes the following steps:
(1), cleans Cathode Foil;
(2), pyroprocessing: Cathode Foil is placed 300 ℃～550 ℃ following roastings 10～60 seconds;
(3), Cathode Foil is immersed in the salpeter solution of 4～10wt%, dipping time is 60～120 seconds, and dipping temperature is 35～45 ℃.
As the preferred embodiments of the invention: in the step (2), the temperature of roasting is 350 ℃～450 ℃.The time of roasting is 15～25 seconds, and 400 ℃ of maturing temperatures, roasting time goes the copper effect best in the time of 20 seconds.In the step (3), the concentration of salpeter solution is 5～7wt%, most preferably 6%, and dipping time is preferably 80～95 seconds, and in general, in the time of 90 seconds, the content of extraneous copper can reach Schwellenwert, and along with the continuation of nitric acid treatment time increases, copper content rises again gradually.
Because the enforcement of above technical scheme, the present invention compared with prior art has following advantage:
The present invention at first makes Cathode Foil produce one deck pellumina through thermooxidizing, and then Cathode Foil handled with salpeter solution remove copper, because the existence of pellumina, the corrosion of copper in salpeter solution do not influenced by the aluminium corrosive, can realize the dissolving fully of copper, thereby the present invention can effectively reduce the remaining copper that cathode foil of aluminum electrolytic capacitor reduces the surface.
Embodiment
The current potential of aluminium in salpeter solution improves with concentration; its current potential is lower than 50% o'clock standard potential less than copper at concentration of nitric acid; therefore, be lower than at 50% o'clock at concentration of nitric acid, aluminium and copper constitute the corrosion galvanic couple; wherein; aluminium is anode, and copper is negative electrode, and at this moment aluminium becomes sacrificial anode; copper obtains galvanic protection, and the copper that adheres on the aluminium foil can not remove.Therefore, in order effectively to remove copper, the concentration of normally used nitric acid must be more than 50%.The present invention directly uses nitric acid treatment with process corrosive Cathode Foil, but before with nitric acid treatment, make the surface of Cathode Foil thermooxidizing take place and generate one deck pellumina, the two poles of the earth of the corrosion galvanic couple of aluminium and copper formation are separated, so, the corrosion of copper in salpeter solution influenced by the aluminium corrosive no longer, promptly uses the nitric acid of low concentration, also can reach extraordinary removal effect.Below in conjunction with concrete specific embodiment, technical scheme of the present invention is further described, but the present invention is not limited to these embodiment.
Embodiment 1
According to the method for the reduction remaining copper on surface of cathode foil of aluminum electrolytic capacitor of present embodiment, Cathode Foil in turn includes the following steps for through the etched foil after the corrosion treatment:
(1), uses the washed with de-ionized water Cathode Foil;
(2), pyroprocessing: Cathode Foil is placed 400 ℃ of following roastings 20 seconds;
(3), Cathode Foil is immersed in the salpeter solution of 6wt%, dipping time is 90 seconds, and dipping temperature is about 40 ℃.
Embodiment 2
According to the method for the reduction remaining copper on surface of cathode foil of aluminum electrolytic capacitor of present embodiment, Cathode Foil in turn includes the following steps for through the etched foil after the corrosion treatment:
(1), uses the washed with de-ionized water Cathode Foil;
(2), pyroprocessing: Cathode Foil is placed 550 ℃ of following roastings 10 seconds;
(3), Cathode Foil is immersed in the salpeter solution of 6wt%, dipping time is 90 seconds, and dipping temperature is about 40 ℃.
Embodiment 3
According to the method for the reduction remaining copper on surface of cathode foil of aluminum electrolytic capacitor of present embodiment, Cathode Foil in turn includes the following steps for through the etched foil after the corrosion treatment:
(1), uses the washed with de-ionized water Cathode Foil;
(2), pyroprocessing: Cathode Foil is placed 300 ℃ of following roastings 50 seconds;
(3), Cathode Foil is immersed in the salpeter solution of 6wt%, dipping time is 90 seconds, and dipping temperature is about 40 ℃.
Embodiment 4
According to the method for the reduction remaining copper on surface of cathode foil of aluminum electrolytic capacitor of present embodiment, Cathode Foil in turn includes the following steps for through the etched foil after the corrosion treatment:
(1), uses the washed with de-ionized water Cathode Foil;
(2), pyroprocessing: Cathode Foil is placed 400 ℃ of following roastings 20 seconds;
(3), Cathode Foil is immersed in the salpeter solution of 4wt%, dipping time is 120 seconds, and dipping temperature is about 40 ℃.
The copper content testing method of establishing criteria detects the residual volume of the Cathode Foil surface copper of embodiment 1～4, the results are shown in Table 1.
Table 1 embodiment 1～4 gained Cathode Foil surface extraneous copper content
| Embodiment | Extraneous copper content (mg/m 2) |
| Embodiment 1 | 1.9 |
| Embodiment 2 | 1.6 |
| Embodiment 3 | 2.3 |
| Embodiment 4 | 2.0 |
More than the present invention has been done detailed description; its purpose is to allow the personage that is familiar with this art can understand content of the present invention and is implemented; can not limit protection scope of the present invention with this; all equivalences of doing according to spirit of the present invention change or modify, and all should be encompassed in protection scope of the present invention.
Claims (5)
1. method that reduces remaining copper on surface of cathode foil of aluminum electrolytic capacitor, described Cathode Foil are for through corrosive X alloy paper tinsel, and it is characterized in that: this method in turn includes the following steps:
(1), cleans Cathode Foil;
(2), pyroprocessing: Cathode Foil is placed 300 ℃～550 ℃ following roastings 10～60 seconds;
(3), Cathode Foil is immersed in the salpeter solution of 4～10wt%, dipping time is 60～120 seconds, and dipping temperature is 35～45 ℃.
2. method according to claim 1 is characterized in that: in the step (2), the temperature of roasting is 350 ℃～450 ℃.
3. method according to claim 1 and 2 is characterized in that: in the step (2), the time of roasting is 15～25 seconds.
4. method according to claim 1 is characterized in that: in the step (3), the concentration of described salpeter solution is 5～7wt%.
5. according to claim 1 or 4 described methods, it is characterized in that: in the step (3), dipping time is 80～95 seconds.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2009101155973A CN101649458B (en) | 2009-06-23 | 2009-06-23 | Method for reducing remaining copper on surface of cathode foil of aluminum electrolytic capacitor |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2009101155973A CN101649458B (en) | 2009-06-23 | 2009-06-23 | Method for reducing remaining copper on surface of cathode foil of aluminum electrolytic capacitor |
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| Publication Number | Publication Date |
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| CN101649458A CN101649458A (en) | 2010-02-17 |
| CN101649458B true CN101649458B (en) | 2011-03-16 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN2009101155973A Expired - Fee Related CN101649458B (en) | 2009-06-23 | 2009-06-23 | Method for reducing remaining copper on surface of cathode foil of aluminum electrolytic capacitor |
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Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN108004547A (en) * | 2017-11-20 | 2018-05-08 | 湖北富奕达电子科技有限公司 | A kind of aluminium electrolytic capacitor cathode aluminium foil corrosion new process |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1489161A (en) * | 2003-08-21 | 2004-04-14 | 上海交通大学 | Method for removing residual copper of aluminium corroding foil surface of negative electrode for aluminium electrolytic capacitor |
| CN1861846A (en) * | 2006-03-27 | 2006-11-15 | 无锡市骏达交通环保有限公司 | Removing process of residual copper on cathode foil surface for improved aluminium electrolyzing capacitor |
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2009
- 2009-06-23 CN CN2009101155973A patent/CN101649458B/en not_active Expired - Fee Related
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1489161A (en) * | 2003-08-21 | 2004-04-14 | 上海交通大学 | Method for removing residual copper of aluminium corroding foil surface of negative electrode for aluminium electrolytic capacitor |
| CN1861846A (en) * | 2006-03-27 | 2006-11-15 | 无锡市骏达交通环保有限公司 | Removing process of residual copper on cathode foil surface for improved aluminium electrolyzing capacitor |
Non-Patent Citations (1)
| Title |
|---|
| 任晓辉等.低表面附着铜含量的铝阴极箔研究.《电子元件与材料》.2004,第23卷(第2期),1-4. * |
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| CN101649458A (en) | 2010-02-17 |
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