CN101060039A - A leadless alloy designed electrolytic capacitor aluminum foil - Google Patents
A leadless alloy designed electrolytic capacitor aluminum foil Download PDFInfo
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- CN101060039A CN101060039A CN 200610113611 CN200610113611A CN101060039A CN 101060039 A CN101060039 A CN 101060039A CN 200610113611 CN200610113611 CN 200610113611 CN 200610113611 A CN200610113611 A CN 200610113611A CN 101060039 A CN101060039 A CN 101060039A
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- aluminum foil
- electrolytic capacitor
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- aluminium foil
- capacitor aluminum
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Abstract
The proposed lead-free alloy aluminum foil for electrolytic capacitor comprises: the Al with weight percent not less than 99. 98%, 1-30pm Si, 1-30ppm Fe, 20-80ppm Cu, 0. 1-20ppm Sn, and other impurities. This invention replaces the Al by Sn to ensure the product performance of corrosivity, is environmental friendly, and reduces product cost.
Description
Technical field
The invention belongs to alminium electrolytic condenser modulator material field, particularly the anode aluminum foil of electrolytic capacitor material.
Background technology
Aluminium foil is the important materials of producing aluminium electrolytic capacitor.Can make the long-pending lifting significantly of aluminium foil surface by suitable corrosion processing, and then obtain the high specific capacitance value.Lead ion has apparently higher than aluminum ions standard electrode potential, and the lead atom of trace is enriched in aluminium foil surface mostly in the finished product aluminium foil, can promote the generation of corrosion hole and the even distribution of promotion aluminium foil surface pit in electrochemical corrosion course significantly.Mainly edge＜100〉direction is vertically to the paper tinsel internal corrosion in the corrosion of high voltage anode aluminum foil, and therefore desirable high voltage anode aluminum foil should have high as far as possible cubic texture.The lead of trace can not influence the generation of strong cubic texture in the aluminium foil, and therefore leaded aluminium foil is present widely used high voltage anode aluminum foil.
Introduced the composition design of a series of ALuminum material for electrode of electrolytic capacitor among the CN1458982A, except the design of Fe, the Si of routine, Cu also by various trace elements such as interpolation Zn, Zr, V, Ti, Mn, Ga, Mg, Ca, In, Sn, Sb to guarantee the corrosive nature of aluminium foil from different perspectives; But important key is in all the components design: the Pb that need add 0.1～3ppm in aluminium foil.
Lead is poisonous carcinogen, if the related personnel absorbs lead in processes such as the production of aluminium foil, processing, use, discarded recovery, then can damage human body.Stipulate countries in the world at present, forbids that the new electronics and the electric equipment that are invested in market comprise harmful substances such as lead.Therefore the lead-free renovation of aluminum foil for electrolytic condenser meets the trend of industrial products environmental requirement and sustainable development.Simultaneously, industrial economical operation rule also requires the exploitation of environmentally friendly machine obviously not improve production cost.
Though the standard electrode potential of tin is higher than aluminium, lower than copper, be starkly lower than lead, therefore be not counted as helping the first-selected element of aluminium foil corrosion performance usually, general only tin as complementary element.
Summary of the invention
The present invention proposes a kind of aluminum foil for electrolytic condenser of lead-free alloyization, replaces lead with tin, when assurance does not contain hazardous substance, does not reduce the corrosive nature of aluminum foil for electrolytic condenser, and with low cost.
In the chemical composition of the present invention, Al purity: percentage by weight contains Si:1～40ppm, Fe:1～40ppm, Cu:10～80ppm, Sn:0.1～20ppm more than or equal to 99.98%, and all the other components are other impurity.
The present invention proposes to replace with tin in aluminium foil plumbous, because the atomic weight of tin has only lead half; The tin atom mark approximately is plumbous one times under the situation of same weight ratio mark.More tin atom helps remedying the lower slightly shortcoming of its standard electrode potential under the same weight fraction.On the other hand, tin is higher than lead at the diffusion coefficient below 300 ℃, helps it and is enriched in aluminium foil surface more, strengthens the effect that it promotes surperficial homogeneous corrosion, has guaranteed the corrosive nature of aluminium foil.Because unleaded, nonhazardous is a kind of environment-friendly type aluminum foil for electrolytic condenser.Simultaneously because tin cheap, and no longer add other trace element, can avoid the raising of this environment-friendly type aluminium foil product cost.
Characteristics of the present invention are, unleaded design, simple, cheap, the function admirable of composition, and corrosive nature is with to contain lead foil suitable.
Embodiment
Following table has provided cubic texture content and the contrast of etch pit distribution situation among the high voltage anode aluminum foil embodiment, and wherein the unit of micronutrient levels such as Sn, Fe, Si, Cu, Pb is ppm.The result shows that all stanniferous aluminium foils have all reached and impelled the even distributed target of corrosion hole.The cubic texture occupation rate of low tin content aluminium foil reaches the level of common high voltage anode aluminum foil and leaded aluminium foil all above 95%; But the cubic texture occupation rate obviously descends after the stanniferous amount surpasses 20ppm.
| High blocking embodiment | Sn | Fe | Si | Cu | Pb | Al | Cubic texture | Pit distributes |
| Common high blocking | -- | 9 | 13 | 50 | -- | ＞99.98％ | ＞95％ | Inhomogeneous |
| Contain Pb0.5ppm | -- | 12 | 14 | 50 | 0.5 | ＞99.98％ | ＞95％ | Evenly |
| Sn1 | 1 | 9 | 9 | 40 | -- | ＞99.98％ | ＞95％ | Evenly |
| Sn2 | 2 | 9 | 9 | 47 | -- | ＞99.98％ | ＞95％ | Evenly |
| Sn5 | 5 | 9 | 10 | 47 | -- | ＞99.98％ | ＞95％ | Evenly |
| Sn10 | 10 | 9 | 10 | 47 | -- | ＞99.98％ | ＞95％ | Evenly |
| Sn23 | 23 | 10 | 17 | 50 | -- | ＞99.98％ | 89％ | Evenly |
Claims (1)
1, a kind of aluminum foil for electrolytic condenser of lead-free alloy design, it is characterized in that, in the chemical composition of aluminum foil for electrolytic condenser, Al purity: percentage by weight is more than or equal to 99.98%, contain Si:1～40ppm, Fe:1～40ppm, Cu:10～80ppm, Sn:0.1～20ppm, all the other components are other impurity.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB2006101136112A CN100511516C (en) | 2006-10-09 | 2006-10-09 | A leadless alloy designed electrolytic capacitor aluminum foil |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB2006101136112A CN100511516C (en) | 2006-10-09 | 2006-10-09 | A leadless alloy designed electrolytic capacitor aluminum foil |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN101060039A true CN101060039A (en) | 2007-10-24 |
| CN100511516C CN100511516C (en) | 2009-07-08 |
Family
ID=38866073
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CNB2006101136112A Expired - Fee Related CN100511516C (en) | 2006-10-09 | 2006-10-09 | A leadless alloy designed electrolytic capacitor aluminum foil |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN100511516C (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103667801A (en) * | 2013-10-25 | 2014-03-26 | 国家电网公司 | Super-high-conductivity aluminum alloy conductor for power transmission system and preparation method thereof |
| JP2019081934A (en) * | 2017-10-31 | 2019-05-30 | 東洋アルミニウム株式会社 | Aluminum foil, and electronic component wiring board including the same, and method for producing the same |
| CN111195657A (en) * | 2020-01-10 | 2020-05-26 | 陈忠德 | Electronic aluminum foil composite material and electronic aluminum foil prepared from same |
-
2006
- 2006-10-09 CN CNB2006101136112A patent/CN100511516C/en not_active Expired - Fee Related
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103667801A (en) * | 2013-10-25 | 2014-03-26 | 国家电网公司 | Super-high-conductivity aluminum alloy conductor for power transmission system and preparation method thereof |
| CN103667801B (en) * | 2013-10-25 | 2016-01-20 | 国家电网公司 | For the preparation method of the superelevation electric conductivity aluminium alloy conductor of power transmission system |
| JP2019081934A (en) * | 2017-10-31 | 2019-05-30 | 東洋アルミニウム株式会社 | Aluminum foil, and electronic component wiring board including the same, and method for producing the same |
| JP7000120B2 (en) | 2017-10-31 | 2022-02-04 | 東洋アルミニウム株式会社 | Aluminum foil and electronic component wiring boards using it, and their manufacturing methods |
| CN111195657A (en) * | 2020-01-10 | 2020-05-26 | 陈忠德 | Electronic aluminum foil composite material and electronic aluminum foil prepared from same |
Also Published As
| Publication number | Publication date |
|---|---|
| CN100511516C (en) | 2009-07-08 |
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Granted publication date: 20090708 Termination date: 20091109 |