CN102915847A - Medium-high voltage electronic aluminum foil corrosion pretreatment method - Google Patents
Medium-high voltage electronic aluminum foil corrosion pretreatment method Download PDFInfo
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- CN102915847A CN102915847A CN2012103917780A CN201210391778A CN102915847A CN 102915847 A CN102915847 A CN 102915847A CN 2012103917780 A CN2012103917780 A CN 2012103917780A CN 201210391778 A CN201210391778 A CN 201210391778A CN 102915847 A CN102915847 A CN 102915847A
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Abstract
A medium-high voltage electronic aluminum foil corrosion pretreatment method comprises the following steps: placing an aluminum foil into pure water or aqueous solution containing ammonia water or amine at the temperature between 70 and 100 DEG C for treatment, performing proper heat treatment after treatment, and generating a hydrated oxidation film with uniformly distributed defects on the surface of the aluminum foil after treatment. During pitting corrosion, Cl<-> is easily transmitted to the surface of the aluminum foil through water and defects in the hydrated oxidation film, so that the pitting uniformity of a high-voltage aluminum foil can be improved, the possibility of hole combination is reduced, and the specific capacitance of the aluminum foil is obviously improved on the premise of not reducing the mechanical strength and the bending performance of the aluminum foil.
Description
Technical field
The present invention relates to anode foil for aluminum electrolytic capacitor corrosion technology field, specifically the pretreated method of a kind of mesohigh electronic aluminum foil corrosion.
Background technology
Miniaturization is the inexorable trend of aluminium electrolytic capacitor development, carries out electrolytic corrosion to enlarge its specific area, to improve than electric capacity by the high pure electronic aluminium foil to purity 〉=99.99%, is the most effective technological approaches of aluminium electrolytic capacitor miniaturization.
At present, the electrolytic corrosion process of mesohigh electric aluminum foil generally comprises preliminary treatment, sends out pitting corrosion, the reprocessing of reaming burn into.The equally distributed high density of high-pressure aluminium foil surface formation, aperture, the long rational Tunnel-hole in hole are the keys that obtains high specific capacitance.The cubic texture that the Tunnel-hole corrosion requires high voltage electronic aluminum foil must have high occupation rate, this needs high voltage electronic aluminum foil to carry out long-time vacuum annealing under a little less than the temperature of its fusing point, the thick γ-Al of mesohigh electric aluminum foil Surface Creation 3 ~ 5 nm
2O
3Film.This layer γ-Al
2O
3Although film is very thin, its compact structure, defect concentration is little, and the aggressivity anion is difficult to penetrate this tunic, and the Tunnel-hole distributed pole that causes aluminium foil surface to form is inhomogeneous, and the also hole of Tunnel-hole easily occurs, and forms cluster formula pit, has limited the raising of aluminium foil than electric capacity.Therefore, the state of mesohigh electric aluminum foil surface film oxide is one of key factor of the density, distribution and the size that affect Tunnel-hole.By certain preliminary treatment, change the state of mesohigh electric aluminum foil surface film oxide or passivating film, such as composition, structure and defective, can effectively improve the uniformity of sending out the hole, improve and compare electric capacity.Therefore, rationally, effectively pretreating process is to improve etched foil than one of key technology of electric capacity.Existing preconditioning technique comprises: acid, alkali soak preliminary treatment, electrolysis pretreatment, chemical deposition metal and shielding film technology etc.China Patent Publication No. is that 101425392A has announced add 0.001 ~ 0.025% bismuth-containing or the compound of indium in the treatment fluid of alkali, acid, mixed base or mixed acid, or the pretreating process of its mixture, has improved the ratio electric capacity of aluminium foil.China Patent Publication No. is that 101976612 A have announced with 0.15 ~ 0.6 mol/LNaOH+0.01 ~ 1%ZnO mixed solution and clean and pretreatment fluid as aluminium foil, has and improves aluminium foil than the effect of electric capacity.Although above patented technology technique is simple, industrial production is easy to realize that it is limited that it improves effect than electric capacity.China Patent Publication No. is that 1993786A has announced and utilized the shielding film technological invention and prepare organic microballoon of one deck arranging rule at aluminium foil surface, guides it to form the orderly Tunnel-hole of high density during aluminium foil corrosion, can significantly improve the specific volume of aluminium foil.This technology is because the flow process complexity is loaded down with trivial details, and governing factor is more, also rests at present the laboratory research stage, has no industrial report in enormous quantities.
Summary of the invention
The present invention is directed to the deficiency of existing mesohigh electric aluminum foil preconditioning technique, provide a kind of under the prerequisite of holding anode aluminium foil mechanical strength and buckling performance, improve Tunnel-hole and send out hole density and uniformity, thereby improve its specific area and than the pretreated method of mesohigh electronic aluminum foil corrosion of electric capacity.
The present invention solves the problems of the technologies described above by the following technical solutions: the pretreated method of a kind of mesohigh electronic aluminum foil corrosion, comprise the steps: that high-pressure aluminium foil placed pure water or at 0 ~ 1% ammoniacal liquor, percentage is mass percent, below identical, or add in pure water in the solution of 0 ~ 1% amine, or in the mixed liquor of 0 ~ 1% ammoniacal liquor and amine, temperature is 70 ~ 100 ℃, processing time is 30 ~ 180s, then sends out pitting corrosion.
The pretreated method of described mesohigh electronic aluminum foil corrosion, comprise the steps: that high-pressure aluminium foil placed pure water or at 0 ~ 1% ammoniacal liquor, or in pure water, add in the solution of 0 ~ 1% amine, or in the mixed liquor of 0 ~ 1% ammoniacal liquor and amine, temperature is 70 ~ 100 ℃, processing time is 30 ~ 180s, with the heat treatment 0 ~ 5h under 400 ~ 550 ℃ of environment of the high-pressure aluminium foil after above-mentioned steps is processed, then sends out pitting corrosion again.
Described amine comprises: monoethanolamine, diethanol amine, triethanolamine, ethylenediamine, propane diamine, diisopropylamine or aniline.
The mixed liquor of described 0 ~ 1% ammoniacal liquor and amine, ammoniacal liquor and amine mixed proportion scope are 1:5 ~ 5:1.
The pretreated method of mesohigh electronic aluminum foil corrosion of the present invention comprises 2 kinds: the first is that aluminium foil only carries out the aqua oxidation preliminary treatment, i.e. the processing of aluminium foil in above-mentioned pretreatment fluid; The second carries out heat treatment to a certain degree after being the preliminary treatment of aluminium foil process aqua oxidation again.
In the first mesohigh electronic aluminum foil corrosion preprocess method, by the aqua oxidation film of aqua oxidation preliminary treatment in aluminium foil surface formation one deck porous, replaced the γ-Al of the original densification of aluminium foil surface
2O
3Film, when sending out pitting corrosion, Cl
-Be transferred to aluminium foil surface by the water in the aqua oxidation film and defective easily, can improve the uniformity that the mesohigh aluminium foil is sent out the hole, reduce and the hole odds.Because the aqua oxidation membrane impedance that aluminium foil surface generates is little, the tunnel hole length of generation can shorten, and the aluminium foil mechanical strength improves.Can make Tunnel-hole reach equal length by supervention hole liquid concentration or temperature after suitably reducing, reduce by 1 ~ 2 ℃ such as the temperature that will send out hole liquid, HCl concentration reduces by 0.05 ~ 0.2M in the solution, can make etched foil under the prerequisite that keeps mechanical strength, improves and compares electric capacity.
In the second mesohigh electronic aluminum foil corrosion preprocess method, form one deck porous by aqua oxidation preliminary treatment and follow-up heat treatment in the aluminium foil surface preparation, and contain the aqua oxidation film of a small amount of crystallization water, the content of the crystallization water depends on heat treatment temperature and time, when sending out pitting corrosion, bootable hole process of water and defective in the aqua oxidation film forms high density, equally distributed Tunnel-hole, and tunnel hole length changes little, therefore can significantly improve the ratio electric capacity of etched foil.
The pretreated method of mesohigh electronic aluminum foil corrosion of the present invention, relatively traditional acid, alkali, mixed acid or mixed base dipping pretreatment technique have that to send out the hole uniformity high, improve more remarkable than electric capacity, the advantage such as solution composition is simple, and is easy to control, and cost is low.
Embodiment
By the following examples technical scheme of the present invention is further described.
In the electrochemical corrosion of anode aluminium foil, adopting purity is 99.99%, and thickness is 120 μ m, and the cubic texture occupation rate is greater than 95% aluminium foil.Send out pitting corrosion through after the preliminary treatment, sending out hole solution is 0.6M HCl+7.4M H
2SO
4+ 0.8 MAl
3+Mixed solution, temperature is 72 ℃, carries out reaming corrosion again, reaming solution is 3%HNO
3Solution, unless otherwise indicated, % is mass percent in full, below identical, temperature is 70 ℃, and reprocessing is salpeter solution, cleans at last, oven dry, last basis " the electron trade standard SJ/T 11140-1997 of the People's Republic of China (PRC): electrode foil for aluminum electrolytic capacitors " is carried out 520V and is changed into.
Comparative Examples
Adopt traditional mixed acid pretreating process, used pretreatment fluid is 1 M HCl+7 M H
2SO
4, temperature is 80 ℃, and aluminium foil is directly soaked 120s in pretreatment fluid, carries out above-mentioned send out pitting corrosion, the reprocessing of reaming burn into and 520V again and changes into processing.
Embodiment 1
It is that 100 ℃ pure water reacts 60s that aluminium foil is placed temperature, carries out send out pitting corrosion, reaming burn into reprocessing and the 520V identical with Comparative Examples again and changes into processing.
Embodiment 2
It is that 100 ℃ pure water reacts 60s that aluminium foil is placed temperature, and sends out pitting corrosion, and sending out a hole solution is 0.5 M HCl+7.4M H
2SO
4+ 0.8M Al
3+Mixed solution, reduce 0.1M than the HCl concentration of Comparative Examples, temperature is 72 ℃, carries out the reaming corrosion identical with Comparative Examples again, reprocessing and 520V change into processing.
Embodiment 3
It is that 100 ℃ pure water reacts 60s that aluminium foil is placed temperature, and sends out pitting corrosion, and sending out a hole solution is 0.6M HCl+7.4M H
2SO
4+ 0.8M Al
3+Mixed solution, temperature is 71 ℃, reduces by 1 ℃ than the temperature of Comparative Examples, carries out the reaming corrosion identical with Comparative Examples again, reprocessing and 520V change into processing.
Embodiment 4
It is 0.3% to contain WITH AMMONIA TREATMENT liquid that aluminium foil is placed mass percent, and temperature is 80 ℃, and the reaction time is 120s, and sends out pitting corrosion, and sending out a hole solution is 0.6M HCl+7.4M H
2SO
4+ 0.8M Al
3+Mixed solution, temperature is 71 ℃, carries out the reaming identical with Comparative Examples corrosion again, reprocessing and 520V change into processing.
Embodiment 5
It is 0.3% to contain the propane diamine treatment fluid that aluminium foil is placed mass percent, and temperature is 80 ℃, and the reaction time is 120s, and sends out pitting corrosion, and sending out a hole solution is 0.6M HCl+7.4M H
2SO
4+ 0.8M Al
3+Mixed solution, temperature is 71 ℃, carries out the reaming identical with Comparative Examples corrosion again, reprocessing and 520V change into processing.
Embodiment 6
Be that aluminium foil is placed temperature is that 100 ℃ pure water reacts 60s, and with aluminium foil heat treatment 2h under 500 ℃ of temperature, carry out again send out pitting corrosion, reaming burn into reprocessing and the 520V identical with Comparative Examples and change into processing.
Embodiment 7
It is 0.3% to contain WITH AMMONIA TREATMENT liquid that aluminium foil is placed mass percent, temperature is 80 ℃, reaction time is 120s, and with aluminium foil heat treatment 30s under 500 ℃ of temperature, carries out send out pitting corrosion, reaming burn into reprocessing and the 520V identical with Comparative Examples again and change into processing.
Embodiment 8
It is 0.3% to contain the propane diamine treatment fluid that aluminium foil is placed mass percent, temperature is 90 ℃, reaction time is 60s, and with aluminium foil heat treatment 30s under 500 ℃ of temperature, carries out send out pitting corrosion, reaming burn into reprocessing and the 520V identical with Comparative Examples again and change into processing.
Embodiment 9
It is 0.3% to contain the triethanolamine treatment fluid that aluminium foil is placed mass percent, temperature is 90 ℃, reaction time is 60s, and with aluminium foil heat treatment 120s under 500 ℃ of temperature, carries out send out pitting corrosion, reaming burn into reprocessing and the 520V identical with Comparative Examples again and change into processing.
Embodiment 10
It is 0.3% ammoniacal liquor and 0.3% triethanolamine mixed treating liquid that aluminium foil is placed mass percent, temperature is 80 ℃, reaction time is 120s, and with aluminium foil heat treatment 120s under 500 ℃ of temperature, carries out send out pitting corrosion, reaming burn into reprocessing and the 520V identical with Comparative Examples again and change into processing.
Table 1 is Comparative Examples and the major parameter that uses preprocess method of the present invention and the bulking value that obtains aluminium foil, shows the specific volume that adopts preprocess method of the present invention can significantly improve aluminium foil.
Table 1 Comparative Examples and use preprocess method of the present invention obtain the bulking value of aluminium foil
As can be seen from Table 1, adopt the present invention can improve electric aluminum foil specific volume 0.045 μ f/cm
2, average out to 0.035 μ f/cm
2The specific volume increase rate is 6.1%, average out to 4.8%.
Claims (4)
1. pretreated method of mesohigh electronic aluminum foil corrosion, it is characterized in that, comprise the steps: that high-pressure aluminium foil placed pure water or at 0 ~ 1% ammoniacal liquor, percentage is mass percent, below identical, or in pure water, add in the solution of 0 ~ 1% amine, or in the mixed liquor of 0 ~ 1% ammoniacal liquor and amine, temperature is 70 ~ 100 ℃, and the processing time is 30 ~ 180s, then sends out pitting corrosion.
2. the pretreated method of mesohigh electronic aluminum foil corrosion according to claim 1, it is characterized in that, comprise the steps: that high-pressure aluminium foil placed pure water or at 0 ~ 1% ammoniacal liquor, or in pure water, add in the solution of 0 ~ 1% amine, or in the mixed liquor of 0 ~ 1% ammoniacal liquor and amine, temperature is 70 ~ 100 ℃, and the processing time is 30 ~ 180s, with the heat treatment 0 ~ 5h under 400 ~ 550 ℃ of environment of the high-pressure aluminium foil after above-mentioned steps is processed, then send out pitting corrosion again.
3. the pretreated method of mesohigh electronic aluminum foil corrosion according to claim 1 is characterized in that, described amine is monoethanolamine, diethanol amine, triethanolamine, ethylenediamine, propane diamine, diisopropylamine or aniline.
4. the pretreated method of mesohigh electronic aluminum foil corrosion according to claim 1 is characterized in that, the mixed liquor of described 0 ~ 1% ammoniacal liquor and amine refers to that ammoniacal liquor and amine mixed proportion scope are 1:5 ~ 5:1.
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Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103361692A (en) * | 2013-07-15 | 2013-10-23 | 广西贺州市桂东电子科技有限责任公司 | Medium-high voltage electronic aluminum foil diffused tin nucleus electro-deposition method |
| CN104078240A (en) * | 2014-07-07 | 2014-10-01 | 南通南辉电子材料股份有限公司 | Method for manufacturing anode foil of alternating current motor capacitor |
| CN105006373A (en) * | 2015-06-09 | 2015-10-28 | 中国海洋大学 | Al/Al2O3/BaTiO3 composite film super capacitor and preparation method thereof |
| CN109786657A (en) * | 2017-11-10 | 2019-05-21 | 宁德时代新能源科技股份有限公司 | Current collector, current collector manufacturing method, electrode pole piece and lithium ion battery |
| CN110783107A (en) * | 2019-11-07 | 2020-02-11 | 南通海星电子股份有限公司 | Method for manufacturing high-mechanical-property low-voltage electrode foil |
| CN114678222A (en) * | 2022-03-07 | 2022-06-28 | 广西正润新材料科技有限公司 | Method for inducing uniform pore formation of medium-high voltage anode foil by hydrothermal in-situ synthesis of multi-metal MOFs |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1092823A (en) * | 1993-03-19 | 1994-09-28 | 松下电器产业株式会社 | Manufacture of anode foil used in aluminium electrolytic capactiance |
| JPH08306592A (en) * | 1995-04-27 | 1996-11-22 | Kobe Steel Ltd | Manufacturing for aluminum foil in electrolytic capacitor |
| JP2003193260A (en) * | 2001-12-27 | 2003-07-09 | Showa Denko Kk | Aluminum foil for electrolytic capacitor electrode having excellent etching property, production method therefor, and method of producing aluminum etched foil for electrolytic capacitor electrode |
-
2012
- 2012-10-16 CN CN2012103917780A patent/CN102915847A/en active Pending
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1092823A (en) * | 1993-03-19 | 1994-09-28 | 松下电器产业株式会社 | Manufacture of anode foil used in aluminium electrolytic capactiance |
| JPH08306592A (en) * | 1995-04-27 | 1996-11-22 | Kobe Steel Ltd | Manufacturing for aluminum foil in electrolytic capacitor |
| JP2003193260A (en) * | 2001-12-27 | 2003-07-09 | Showa Denko Kk | Aluminum foil for electrolytic capacitor electrode having excellent etching property, production method therefor, and method of producing aluminum etched foil for electrolytic capacitor electrode |
Cited By (11)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103361692A (en) * | 2013-07-15 | 2013-10-23 | 广西贺州市桂东电子科技有限责任公司 | Medium-high voltage electronic aluminum foil diffused tin nucleus electro-deposition method |
| CN103361692B (en) * | 2013-07-15 | 2016-03-30 | 广西贺州市桂东电子科技有限责任公司 | The method of mesohigh electric aluminum foil galvanic deposit disperse tin nucleus |
| CN104078240A (en) * | 2014-07-07 | 2014-10-01 | 南通南辉电子材料股份有限公司 | Method for manufacturing anode foil of alternating current motor capacitor |
| CN104078240B (en) * | 2014-07-07 | 2017-01-18 | 南通南辉电子材料股份有限公司 | Method for manufacturing anode foil of alternating current motor capacitor |
| CN105006373A (en) * | 2015-06-09 | 2015-10-28 | 中国海洋大学 | Al/Al2O3/BaTiO3 composite film super capacitor and preparation method thereof |
| CN105006373B (en) * | 2015-06-09 | 2017-12-12 | 中国海洋大学 | A kind of aluminium/aluminum oxide/barium titanate laminated film ultracapacitor and preparation method thereof |
| CN109786657A (en) * | 2017-11-10 | 2019-05-21 | 宁德时代新能源科技股份有限公司 | Current collector, current collector manufacturing method, electrode pole piece and lithium ion battery |
| CN110783107A (en) * | 2019-11-07 | 2020-02-11 | 南通海星电子股份有限公司 | Method for manufacturing high-mechanical-property low-voltage electrode foil |
| CN110783107B (en) * | 2019-11-07 | 2021-06-29 | 南通海星电子股份有限公司 | Method for manufacturing high-mechanical-property low-voltage electrode foil |
| CN114678222A (en) * | 2022-03-07 | 2022-06-28 | 广西正润新材料科技有限公司 | Method for inducing uniform pore formation of medium-high voltage anode foil by hydrothermal in-situ synthesis of multi-metal MOFs |
| CN114678222B (en) * | 2022-03-07 | 2024-06-07 | 广西广投正润新材料科技有限公司 | Method for inducing uniform pore formation of medium-high voltage anode foil by adopting hydrothermal in-situ synthesis of multi-metal MOFs |
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Application publication date: 20130206 |