JPH0653083A - Manufacture of electrode foil for aluminum electrolytic capacitor - Google Patents
Manufacture of electrode foil for aluminum electrolytic capacitorInfo
- Publication number
- JPH0653083A JPH0653083A JP20332592A JP20332592A JPH0653083A JP H0653083 A JPH0653083 A JP H0653083A JP 20332592 A JP20332592 A JP 20332592A JP 20332592 A JP20332592 A JP 20332592A JP H0653083 A JPH0653083 A JP H0653083A
- Authority
- JP
- Japan
- Prior art keywords
- acid
- aqueous solution
- electrolytic capacitor
- electrode foil
- aluminum
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
Landscapes
- ing And Chemical Polishing (AREA)
Abstract
Description
【0001】[0001]
【産業上の利用分野】本発明はアルミニウム電解コンデ
ンサ用電極箔の製造方法に関するものである。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for manufacturing an electrode foil for aluminum electrolytic capacitors.
【0002】[0002]
【従来の技術】一般に、アルミニウム電解コンデンサに
おけるコンデンサ素子は、一対のアルミニウム箔を絶縁
紙とともに巻回し、かつ、駆動用電解液を含浸させるこ
とにより構成されている。アルミニウム電解コンデンサ
用電極箔は、塩素イオンを含む溶液中でその表面に電気
化学的あるいは化学的エッチング処理を施すことによっ
て粗面化を行い、単位面積当りの静電容量を大きくする
ことにより、アルミニウム電解コンデンサの小形化・軽
量化を実現してきた。特に低圧用電極箔のエッチングに
おいては交流電流によるエッチング処理が行われてお
り、高い拡面倍率が得られている。2. Description of the Related Art Generally, a capacitor element in an aluminum electrolytic capacitor is constructed by winding a pair of aluminum foils together with insulating paper and impregnating a driving electrolytic solution. The electrode foil for aluminum electrolytic capacitors is roughened by subjecting its surface to electrochemical or chemical etching treatment in a solution containing chlorine ions to increase the electrostatic capacity per unit area, We have realized downsizing and weight reduction of electrolytic capacitors. Particularly in the etching of the electrode foil for low voltage, an etching treatment with an alternating current is performed, and a high surface expansion ratio is obtained.
【0003】ここで、エッチング開始前のアルミニウム
箔の表面状態が交流エッチングによる粗面化に与える影
響は大きく、エッチング後のアルミニウム箔の静電容量
を左右することもある。Here, the surface condition of the aluminum foil before the start of etching has a great influence on the roughening by the AC etching, and the electrostatic capacity of the aluminum foil after the etching may be influenced.
【0004】実際のエッチング処理においては、多くの
場合、アルミニウム原箔の表面に残存している箔圧延時
の潤滑油等の汚れや自然酸化皮膜の除去、あるいはエッ
チングの腐食開始点の生成を目的として、例えばリン酸
やアルカリ水溶液等への浸漬処理がエッチング前処理と
して行われている。In the actual etching process, in many cases, the purpose is to remove stains such as lubricating oil and natural oxide film remaining on the surface of the original aluminum foil during foil rolling, or to create a corrosion starting point for etching. For example, a dipping treatment in phosphoric acid or an alkaline aqueous solution is performed as a pre-etching treatment.
【0005】[0005]
【発明が解決しようとする課題】しかしながら、このよ
うな浸漬処理による方法ではアルミニウム原箔の表面状
態、すなわち汚れや自然酸化皮膜のつき方によって処理
ムラを生じたり、その効果が不十分であるために、十分
な静電容量が得られていないという問題点があった。However, in such a method by the dipping treatment, the surface condition of the aluminum original foil, that is, the unevenness of the treatment is caused by the stain or the way of the natural oxide film, and the effect is insufficient. In addition, there is a problem that a sufficient capacitance is not obtained.
【0006】本発明はこのような従来の問題点を解決す
るもので、従来よりも安定した高い静電容量が得られる
アルミニウム電解コンデンサ用電極箔の製造方法を提供
することを目的とするものである。The present invention solves the above-mentioned conventional problems, and an object of the present invention is to provide a method of manufacturing an electrode foil for an aluminum electrolytic capacitor, which is capable of obtaining a stable and high electrostatic capacity as compared with the prior art. is there.
【0007】[0007]
【課題を解決するための手段】上記目的を達成するため
に本発明のアルミニウム電解コンデンサ用電極箔の製造
方法は、アルミニウム箔の交流電流によるエッチング処
理を行う前工程として、アルカリ水溶液中へ浸漬して処
理する工程と、この工程の後、塩酸を主体とし、かつリ
ン酸、硫酸、シュウ酸およびクロム酸のうち少なくとも
1種類を含ませた水溶液中で直流電流によるエッチング
処理を行う工程を設けたものである。In order to achieve the above object, the method for producing an electrode foil for an aluminum electrolytic capacitor according to the present invention comprises a step of immersing the aluminum foil in an alkaline aqueous solution as a pre-step of etching the aluminum foil with an alternating current. And a step of performing a DC current etching treatment in an aqueous solution containing hydrochloric acid as a main component and at least one of phosphoric acid, sulfuric acid, oxalic acid and chromic acid after this step. It is a thing.
【0008】[0008]
【作用】上記製造方法によれば、アルミニウム箔の交流
電流によるエッチング処理を行う前工程として、アルカ
リ水溶液中へ浸漬して処理する工程と、この工程の後、
塩酸を主体とし、かつリン酸、硫酸、シュウ酸およびク
ロム酸のうち少なくとも1種類を含ませた水溶液中で直
流電流によるエッチング処理を行う工程を設けているも
ので、アルカリ水溶液中への浸漬処理により、アルミニ
ウム原箔の表面の汚れや自然酸化皮膜をかなりの程度ま
で除去することができ、さらに直流電流によるエッチン
グ処理で、均一かつ十分に除去することができるため、
電極箔の表面に均一な保護皮膜を形成することができ
る。この保護皮膜は多孔質のものであり、孔以外の部分
は皮膜に覆われているために不活性であるが、孔の部分
は塩素イオンにより浸食されて活性となる。したがっ
て、この後に交流電流によるエッチング処理を行うと、
アルミニウム箔の表面上の活性部分、すなわち孔の部分
からの腐食が均一かつ高密度に起こり、不活性な部分か
らの腐食は起こらないため、高い静電容量を安定して得
ることができる。According to the above-mentioned manufacturing method, as a pre-step of performing the etching treatment of the aluminum foil with an alternating current, a step of immersing the aluminum foil in an alkaline aqueous solution and a treatment after this step,
It has a step of etching by direct current in an aqueous solution mainly containing hydrochloric acid and containing at least one of phosphoric acid, sulfuric acid, oxalic acid and chromic acid. Immersion in an alkaline aqueous solution As a result, it is possible to remove the dirt and natural oxide film on the surface of the aluminum raw foil to a considerable extent, and further it is possible to remove it uniformly and sufficiently by the etching treatment by the direct current.
A uniform protective film can be formed on the surface of the electrode foil. This protective film is porous and is inactive because the parts other than the pores are covered with the film, but the pores are eroded by chlorine ions and become active. Therefore, if an etching process with an alternating current is performed after this,
Corrosion from the active portion, that is, the hole portion, on the surface of the aluminum foil occurs uniformly and at high density, and the corrosion from the inactive portion does not occur, so that a high capacitance can be stably obtained.
【0009】[0009]
【実施例】以下、本発明の実施例について説明する。EXAMPLES Examples of the present invention will be described below.
【0010】本発明の実施例では、交流電流によるエッ
チング処理を行う前工程として、アルミニウム箔を3w
t% NaOH、液温50℃の水溶液中に180秒間浸
漬する処理を行い、この工程の後、7wt% HCl,
15wt% H2SO4,10wt% AlCl3、液温
80℃の水溶液中で、直流電流によるエッチング処理と
して、電流密度0.3A/cm2の直流電流を10秒間印
加した。この後、交流電流によるエッチング処理を8w
t% HCl,2wt% AlCl3、液温35℃の水
溶液中で、電流密度0.3A/cm2、周波数60Hzの交
流電流で420秒間行った。In the embodiment of the present invention, 3 w of aluminum foil is used as a pre-process for performing the etching treatment with an alternating current.
A treatment of immersing in an aqueous solution of t% NaOH and a liquid temperature of 50 ° C. for 180 seconds is performed, and after this step, 7 wt% HCl,
As an etching treatment with a direct current, a direct current with a current density of 0.3 A / cm 2 was applied for 10 seconds in an aqueous solution of 15 wt% H 2 SO 4 , 10 wt% AlCl 3 , and a liquid temperature of 80 ° C. After this, an etching process with an alternating current is performed for 8 w.
It was carried out in an aqueous solution of t% HCl, 2 wt% AlCl 3 , and a liquid temperature of 35 ° C. for 420 seconds with an alternating current having a current density of 0.3 A / cm 2 and a frequency of 60 Hz.
【0011】その比較例としては、交流電流によるエッ
チング処理を行う前に、アルミニウム箔を3wt% N
aOH、液温50℃の水溶液中で、180秒間浸漬する
浸漬処理を行い、この後、交流電流によるエッチング処
理を8wt% HCl,2wt% AlCl3、液温3
5℃の水溶液中で、電流密度0.3A/cm2、周波数6
0Hzの交流電流で420秒間行った。As a comparative example, an aluminum foil of 3 wt% N was added before etching with an alternating current.
Immersion treatment is performed by immersing for 180 seconds in an aqueous solution of aOH at a liquid temperature of 50 ° C., and then etching treatment by an alternating current is performed with 8 wt% HCl, 2 wt% AlCl 3 , liquid temperature 3
Current density 0.3 A / cm 2 , frequency 6 in 5 ° C aqueous solution
It was conducted for 420 seconds with an alternating current of 0 Hz.
【0012】上記した本発明の実施例および比較例でエ
ッチングされたそれぞれのアルミニウム箔について、7
0Vで化成処理を実施したときの両者の静電容量を比較
すると、比較例では16.3μF/cm2であるのに対
し、本発明の実施例では18.1μF/cm2であった。For each of the aluminum foils etched in the above-mentioned Examples of the present invention and Comparative Examples, 7
Comparing the electrostatic capacities of both when the chemical conversion treatment was carried out at 0 V, it was 16.3 μF / cm 2 in the comparative example, whereas it was 18.1 μF / cm 2 in the example of the present invention.
【0013】上記のように本発明の実施例におけるアル
ミニウム電解コンデンサ用電極箔は比較例に対し、10
%以上高い静電容量を得ることができる。これは交流電
流によるエッチング処理の前工程として行われる本発明
の実施例のアルカリ水溶液中への浸漬処理と直流電流に
よるエッチング処理の方が、比較例のアルカリ水溶液中
への浸漬処理のみの場合に比べ、アルミニウム原箔の表
面の汚れや自然酸化皮膜の除去を電気化学的に、均一か
つ十分に行うことができ、そして、直流電流によるエッ
チング処理液中に含まれる皮膜形成作用を有する硫酸に
より、均一で高密度の腐食開始点を生成しうる保護皮膜
を形成するからである。As described above, the electrode foil for an aluminum electrolytic capacitor in the example of the present invention was 10
% Or more high capacitance can be obtained. This is the case where the immersion treatment in the alkaline aqueous solution of the embodiment of the present invention and the etching treatment by the direct current which are performed as a pre-process of the etching treatment by the alternating current are only the immersion treatment in the alkaline aqueous solution of the comparative example. In comparison, it is possible to electrochemically and uniformly remove the dirt and the natural oxide film on the surface of the aluminum raw foil, and with sulfuric acid having a film forming action contained in the etching treatment liquid by direct current, This is because it forms a protective film capable of generating a uniform and high-density corrosion starting point.
【0014】本発明の実施例で用いられる直流エッチン
グ処理液の塩酸濃度は1〜20wt%で、好ましくは3
〜10wt%でよく、かつ硫酸を0.1〜30wt%、
特に好ましくは3〜25wt%を含むものがよい。ま
た、直流エッチング処理の条件としては0.05〜1A
/cm2の直流電流を10〜90秒間印加する。そしてま
た、処理液の温度としては20〜90℃がよく、好まし
くは60〜90℃がよい。The hydrochloric acid concentration of the DC etching treatment liquid used in the embodiment of the present invention is 1 to 20 wt%, preferably 3
10 to 10 wt% is sufficient, and sulfuric acid is 0.1 to 30 wt%,
Particularly preferably, it contains 3 to 25 wt%. The conditions for the DC etching treatment are 0.05 to 1 A.
A direct current of / cm 2 is applied for 10 to 90 seconds. Further, the temperature of the treatment liquid is preferably 20 to 90 ° C, more preferably 60 to 90 ° C.
【0015】なお、上記本発明の実施例では、塩酸を主
体とする水溶液に硫酸を用いたものについて説明した
が、硫酸の代わりにリン酸、シュウ酸、クロム酸のいず
れか一つを用いても上記実施例と同様の効果を有するも
のである。In the above embodiments of the present invention, sulfuric acid was used as the aqueous solution containing hydrochloric acid as a main component, but any one of phosphoric acid, oxalic acid and chromic acid was used instead of sulfuric acid. Also has the same effect as the above embodiment.
【0016】[0016]
【発明の効果】以上のように本発明のアルミニウム電解
コンデンサ用電極箔の製造方法によれば、アルミニウム
箔の交流電流によるエッチング処理を行う前工程とし
て、アルカリ水溶液中へ浸漬して処理する工程と、この
工程の後、塩酸を主体とし、かつリン酸、硫酸、シュウ
酸およびクロム酸のうち少なくとも1種類を含ませた水
溶液中で直流電流によるエッチング処理を行う工程を設
けているため、高い静電容量をもつアルミニウム電解コ
ンデンサ用電極箔を得ることができるものである。As described above, according to the method for producing an electrode foil for an aluminum electrolytic capacitor of the present invention, a step of dipping the aluminum foil in an alkaline aqueous solution as a pre-step of performing an etching treatment with an alternating current, and After this step, there is a step of performing direct current etching treatment in an aqueous solution containing hydrochloric acid as a main component and containing at least one of phosphoric acid, sulfuric acid, oxalic acid and chromic acid, so that high static The electrode foil for an aluminum electrolytic capacitor having a capacitance can be obtained.
Claims (1)
グ処理を行う前工程として、アルカリ水溶液中へ浸漬し
て処理する工程と、この工程の後、塩酸を主体としかつ
リン酸、硫酸、シュウ酸およびクロム酸のうち少なくと
も1種類を含ませた水溶液中で直流電流によるエッチン
グ処理を行う工程を設けたアルミニウム電解コンデンサ
用電極箔の製造方法。1. A process of dipping in an alkaline aqueous solution as a pre-process for etching an aluminum foil with an alternating current, and after this process, mainly hydrochloric acid and phosphoric acid, sulfuric acid, oxalic acid and chromium. A method for producing an electrode foil for an aluminum electrolytic capacitor, which comprises a step of performing an etching treatment with a direct current in an aqueous solution containing at least one kind of acid.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP20332592A JPH0653083A (en) | 1992-07-30 | 1992-07-30 | Manufacture of electrode foil for aluminum electrolytic capacitor |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP20332592A JPH0653083A (en) | 1992-07-30 | 1992-07-30 | Manufacture of electrode foil for aluminum electrolytic capacitor |
Publications (1)
Publication Number | Publication Date |
---|---|
JPH0653083A true JPH0653083A (en) | 1994-02-25 |
Family
ID=16472149
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP20332592A Pending JPH0653083A (en) | 1992-07-30 | 1992-07-30 | Manufacture of electrode foil for aluminum electrolytic capacitor |
Country Status (1)
Country | Link |
---|---|
JP (1) | JPH0653083A (en) |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
WO2019041797A1 (en) * | 2017-08-30 | 2019-03-07 | 南通海星电子股份有限公司 | Etching method for electrode foil for low-contact resistance low-voltage aluminum electrolytic capacitor |
-
1992
- 1992-07-30 JP JP20332592A patent/JPH0653083A/en active Pending
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
WO2019041797A1 (en) * | 2017-08-30 | 2019-03-07 | 南通海星电子股份有限公司 | Etching method for electrode foil for low-contact resistance low-voltage aluminum electrolytic capacitor |
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