JP2005154868A - Method of producing aluminum electrode foil for electrolytic capacitor - Google Patents
Method of producing aluminum electrode foil for electrolytic capacitor Download PDFInfo
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Abstract
Description
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り、特に、低圧用電極箔に関するものである。 The present invention relates to a method for producing an electrode foil for an aluminum electrolytic capacitor, and particularly to a low-pressure electrode foil.
今日、電子機器の小形化、薄形化にともない、アルミニウム電解コンデンサの小形化の要求が高まっている。またデジタル化が進む中で、高性能化も求められている。そのため、電解コンデンサ用アルミニウム電極箔の漏れ電流の低減が要求されている。従来は、化成処理を行う工程の途中で酸性水溶液中に浸漬を施して皮膜を溶解し、漏れ電流の原因である皮膜中のボイドやクラックを露呈後、修復化成を行い電極箔としていた(例えば、非特許文献1参照)。 Today, with the miniaturization and thinning of electronic devices, there is an increasing demand for miniaturization of aluminum electrolytic capacitors. As digitalization advances, higher performance is also required. Therefore, reduction of the leakage current of the aluminum electrode foil for electrolytic capacitors is required. Conventionally, the film was dissolved by immersion in an acidic aqueous solution in the middle of the chemical conversion treatment, and after exposing the voids and cracks in the film that caused the leakage current, it was repaired and formed into an electrode foil (for example, Non-patent document 1).
しかし、従来の電解コンデンサ用アルミニウム電極箔の製造方法においては、酸性溶液による皮膜の溶解が不十分であり、また、溶解量が増加すると静電容量が低下するという問題があった。よって、静電容量値を維持しつつ漏れ電流を低減する製造方法が求められていた。 However, in the conventional method for producing an aluminum foil for electrolytic capacitors, there is a problem that the film is not sufficiently dissolved by the acidic solution, and the capacitance decreases as the amount of dissolution increases. Therefore, a manufacturing method for reducing leakage current while maintaining the capacitance value has been demanded.
本発明は、上記課題を解決するため、エッチングされたアルミニウム箔に陽極酸化(以下、化成と称す)を行う工程で、該アルミニウム箔を、pH緩衝剤が含まれる水溶液に浸漬することを特徴とする電解コンデンサ用アルミニウム電極箔の製造方法である。 In order to solve the above-mentioned problems, the present invention is characterized by immersing the aluminum foil in an aqueous solution containing a pH buffering agent in a step of anodizing (hereinafter referred to as chemical conversion) the etched aluminum foil. It is a manufacturing method of the aluminum electrode foil for electrolytic capacitors.
また、上記の水溶液中のpH緩衝剤がリン酸塩であることを特徴とする電解コンデンサ用アルミニウム電極箔の製造方法である。 Further, the present invention provides the method for producing an aluminum electrode foil for electrolytic capacitors, wherein the pH buffer in the aqueous solution is a phosphate.
さらに、上記のリン酸塩がリン酸のナトリウム塩またはカリウム塩であり、その濃度が1.0〜200g/lであることを特徴とする電解コンデンサ用アルミニウム電極箔の製造方法である。 Furthermore, the above-mentioned phosphate is a sodium salt or potassium salt of phosphoric acid, and the concentration thereof is 1.0 to 200 g / l.
そして、上記のpH緩衝剤が含まれる水溶液にリン酸を混合することを特徴とする電解コンデンサ用アルミニウム電極箔の製造方法である。 And it is a manufacturing method of the aluminum electrode foil for electrolytic capacitors characterized by mixing phosphoric acid with the aqueous solution containing said pH buffer.
また、上記のpH緩衝剤の濃度が1.0〜200g/lであり、かつ、リン酸の濃度が30〜150g/lであることを特徴とする電解コンデンサ用アルミニウム電極箔の製造方法である。 Moreover, it is a manufacturing method of the aluminum electrode foil for electrolytic capacitors characterized by the density | concentration of said pH buffer being 1.0-200 g / l, and the density | concentration of phosphoric acid being 30-150 g / l. .
エッチング箔を化成工程で、pH緩衝剤が含まれる水溶液に浸漬することで、低圧小形品においても、静電容量を低下させることなく、漏れ電流を低減した電解コンデンサ用アルミニウム電極箔を製造することができる。
すなわち、pH緩衝剤の作用により水溶液中にOH基が生成され、OH基が外層の陽極酸化皮膜を通過し内部に到達して、皮膜欠陥部分に吸着し、次工程での再化成処理における皮膜生成の核となり、皮膜欠陥部の修復が可能となり、静電容量低下を伴わずに、皮膜内部の欠陥を修復して漏れ電流を低減するものと考えられる。
Manufacturing an aluminum electrode foil for electrolytic capacitors with reduced leakage current without reducing the capacitance even in low-pressure small products by immersing the etching foil in an aqueous solution containing a pH buffering agent in the chemical conversion step Can do.
That is, OH groups are generated in the aqueous solution by the action of the pH buffering agent, the OH groups pass through the outer anodic oxide film, reach the inside, and are adsorbed on the film defect portion, and the film in the re-chemical conversion treatment in the next step It is considered that the defect of the film can be repaired and the defects inside the film can be repaired to reduce the leakage current without lowering the capacitance.
以下、本発明について実施例に基づき具体的に説明する。 Hereinafter, the present invention will be specifically described based on examples.
[実施例1〜12]
エッチングされたアルミニウム箔を、アジピン酸アンモニウム80g/l、アジピン酸1.5g/lを溶解した化成液中で、85±2℃にて電圧印加し、22Vまで電圧を上昇させて化成し、その状態で17分間保持した後、pH緩衝剤として表1の組成のリン酸二水素ナトリウムを含む水溶液に60±2℃で1分40秒浸漬した。
また、従来例1、2としてリン酸を水溶液(30.0g/l、75.0g/l)に上記と同じ条件で浸漬した。
[Examples 1 to 12]
An etched aluminum foil was formed by applying a voltage at 85 ± 2 ° C. in a chemical solution in which ammonium adipate 80 g / l and adipic acid 1.5 g / l were dissolved, and increasing the voltage to 22 V. After maintaining for 17 minutes in the state, it was immersed in an aqueous solution containing sodium dihydrogen phosphate having the composition shown in Table 1 as a pH buffer at 60 ± 2 ° C. for 1 minute and 40 seconds.
Further, as Conventional Examples 1 and 2, phosphoric acid was immersed in an aqueous solution (30.0 g / l, 75.0 g / l) under the same conditions as described above.
上記の実施例1〜12、および従来例1、2の化成箔を用い、電圧20V印加3分後の漏れ電流、および静電容量を測定した。その結果を表1に示す。 Using the chemical conversion foils of Examples 1 to 12 and Conventional Examples 1 and 2, the leakage current 3 minutes after application of a voltage of 20 V and the capacitance were measured. The results are shown in Table 1.
表1から明らかなように、実施例2〜11の条件により得られた電解コンデンサ用アルミニウム電極箔は、従来例1(リン酸濃度30.0g/l)と比較して漏れ電流が0.49〜0.60倍に減少している。また、静電容量は同等レベルである。
ただし、リン酸二水素ナトリウム濃度は0.5g/lでは漏れ電流の低減効果が小さく(実施例1)、300g/lでは静電容量値が減少している(実施例12)。よって、リン酸二水素ナトリウム濃度は1.0〜200g/lの範囲が適当である。
また、このとき、リン酸二水素ナトリウム水溶液のpHは、8〜9の範囲になる。
そして、従来例2のようにリン酸濃度を75.0g/lとすると、漏れ電流が従来例1の0.60倍に減少するが、静電容量値も低下するので好ましくない。
As is apparent from Table 1, the aluminum electrode foil for electrolytic capacitors obtained under the conditions of Examples 2 to 11 had a leakage current of 0.49 compared to Conventional Example 1 (phosphoric acid concentration 30.0 g / l). It has decreased to ~ 0.60 times. Further, the capacitance is at the same level.
However, when the sodium dihydrogen phosphate concentration is 0.5 g / l, the effect of reducing leakage current is small (Example 1), and at 300 g / l, the capacitance value is reduced (Example 12). Accordingly, the sodium dihydrogen phosphate concentration is suitably in the range of 1.0 to 200 g / l.
At this time, the pH of the aqueous sodium dihydrogen phosphate solution is in the range of 8-9.
When the phosphoric acid concentration is 75.0 g / l as in Conventional Example 2, the leakage current is reduced to 0.60 times that of Conventional Example 1, but the capacitance value is also not preferable.
[実施例13〜31]
上記実施例1〜12と同様に、エッチングされたアルミニウム箔をアジピン酸アンモニウム80g/l、アジピン酸1.5g/lを溶解した化成液中で、85±2℃にて電圧印加し、22Vまで電圧を上昇させて化成し、その状態で17分間保持した後、pH緩衝剤として表2の組成のリン酸二水素ナトリウムおよびリン酸を含む水溶液に60±2℃で1分40秒浸漬した。
[Examples 13 to 31]
In the same manner as in Examples 1 to 12 above, a voltage was applied to the etched aluminum foil at 85 ± 2 ° C. in a chemical solution in which 80 g / l of ammonium adipate and 1.5 g / l of adipic acid were dissolved. After increasing the voltage and forming, and maintaining in that state for 17 minutes, it was immersed in an aqueous solution containing sodium dihydrogen phosphate and phosphoric acid having the composition shown in Table 2 as a pH buffer at 60 ± 2 ° C. for 1 minute and 40 seconds.
上記の実施例13〜31の化成箔を用い、電圧20V印加3分後の漏れ電流、および静電容量を測定した。その結果を表2に示す。 Using the chemical conversion foils of Examples 13 to 31, the leakage current and the capacitance after 3 minutes from the voltage of 20 V were measured. The results are shown in Table 2.
表2から明らかなように、実施例14〜21、23〜27、29、30の条件により得られた電解コンデンサ用アルミニウム電極箔は、従来例と比較して漏れ電流が0.51〜0.74倍に減少している。また、静電容量は従来例1と同等レベルである。
このとき、リン酸二水素ナトリウム濃度が0.5g/lでは漏れ電流の低減効果が小さく(実施例13)、また、300g/lでは静電容量値が減少している(実施例31)。
また、リン酸濃度が15.0g/lでは漏れ電流の低減効果が小さく(実施例22)、180g/lでは静電容量値が減少している(実施例28)。
よって、リン酸二水素ナトリウム濃度は1.0〜200g/l、リン酸濃度は30〜150g/lの範囲が適当である。
As is apparent from Table 2, the aluminum electrode foil for electrolytic capacitors obtained under the conditions of Examples 14 to 21, 23 to 27, 29, and 30 has a leakage current of 0.51 to 0. 0 as compared with the conventional example. It has decreased by 74 times. Further, the electrostatic capacity is at the same level as in Conventional Example 1.
At this time, when the sodium dihydrogen phosphate concentration is 0.5 g / l, the effect of reducing the leakage current is small (Example 13), and at 300 g / l, the capacitance value is reduced (Example 31).
Further, when the phosphoric acid concentration is 15.0 g / l, the effect of reducing the leakage current is small (Example 22), and when the phosphoric acid concentration is 180 g / l, the capacitance value is decreased (Example 28).
Therefore, it is appropriate that the sodium dihydrogen phosphate concentration is 1.0 to 200 g / l and the phosphoric acid concentration is 30 to 150 g / l.
なお、上記実施例としてリン酸二水素ナトリウムを用いたが、リン酸水素二ナトリウムやナトリウム塩だけでなく、カリウム塩であっても、同様の効果を得ることができる。 In addition, although the sodium dihydrogen phosphate was used as the said Example, even if it is not only a disodium hydrogen phosphate and a sodium salt but a potassium salt, the same effect can be acquired.
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