JP2523654B2 - Method for manufacturing electrode foil for aluminum electrolytic capacitors - Google Patents
Method for manufacturing electrode foil for aluminum electrolytic capacitorsInfo
- Publication number
- JP2523654B2 JP2523654B2 JP62169026A JP16902687A JP2523654B2 JP 2523654 B2 JP2523654 B2 JP 2523654B2 JP 62169026 A JP62169026 A JP 62169026A JP 16902687 A JP16902687 A JP 16902687A JP 2523654 B2 JP2523654 B2 JP 2523654B2
- Authority
- JP
- Japan
- Prior art keywords
- chemical conversion
- aluminum
- foil
- electrode foil
- anode
- 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.)
- Expired - Lifetime
Links
Landscapes
- Chemical Treatment Of Metals (AREA)
Description
【発明の詳細な説明】 産業上の利用分野 本発明は、各種電気機器に利用されるアルミ電解コン
デンサ用電極箔の製造方法に関するものである。TECHNICAL FIELD The present invention relates to a method for producing an electrode foil for an aluminum electrolytic capacitor used in various electric devices.
従来の技術 一般にアルミ電解コンデンサは、電解エッチングを行
って実効表面積を拡大した電極箔に、化成処理により化
成皮膜（Al2O3）を形成し、そしてその電極箔をセパレ
ータと共に巻回して駆動用電解液を含浸させることによ
り構成している。Conventional technology Generally, aluminum electrolytic capacitors are used for driving by forming a chemical conversion film (Al 2 O 3 ) by chemical conversion treatment on an electrode foil whose effective surface area has been expanded by electrolytic etching, and winding the electrode foil together with a separator. It is configured by impregnating with an electrolytic solution.
最近電子部品の高密度実装に伴い、アルミ電解コンデ
ンサも、高温で使用される場合がほとんどである。その
結果、内部のアルミニウム電極箔は、表面の化成皮膜
が、高温中で駆動用電解液と接して使用されることにな
る。With the recent high-density mounting of electronic components, aluminum electrolytic capacitors are almost always used at high temperatures. As a result, the chemical conversion film on the surface of the internal aluminum electrode foil is used in contact with the driving electrolyte at high temperature.
駆動用電解液には、通常１〜10％程度の水分を含有す
るために、電解コンデンサが高温で、安定に動作するた
めには、陽極箔表面の化成皮膜が、耐水性を有し、電解
液中の水分に対して化学的安定性を持っていることが必
要である。Since the driving electrolyte usually contains about 1 to 10% of water, in order for the electrolytic capacitor to operate stably at high temperature, the chemical conversion film on the surface of the anode foil has water resistance and It is necessary to have chemical stability against water in the liquid.
従来は、化成皮膜に耐水性を持たせるため、リン酸水
溶液あるいはリン酸塩水溶液（アンモニウム塩、ナトリ
ウム塩等）に浸漬することにより、表面にリン酸イオン
を付着させる方法が一般的であった。Conventionally, in order to impart water resistance to a chemical conversion film, a method of attaching phosphate ions to the surface by immersing in a phosphoric acid aqueous solution or a phosphate aqueous solution (ammonium salt, sodium salt, etc.) has been generally used. .
発明が解決しようとする問題点 しかしながら、この従来の方法では、リン酸イオンと
アルミとの化学的密着性には限界があり、高温で長時間
経過すると、リン酸イオンが化成箔表面から離脱して化
成皮膜の耐水性が低下するという問題点があった。DISCLOSURE OF THE INVENTION Problems to be Solved by the Invention However, in this conventional method, there is a limit to the chemical adhesion between phosphate ion and aluminum, and phosphate ion is released from the surface of the chemical conversion foil after a long time at high temperature. However, there is a problem that the water resistance of the chemical conversion coating is lowered.
本発明は、このような従来の問題点を解決するもの
で、化成皮膜の耐水性を向上させることを目的とするも
のである。The present invention solves such conventional problems, and an object thereof is to improve the water resistance of a chemical conversion film.
問題点を解決するための手段 上記問題点を解決するために、本発明のアルミ電解コ
ンデンサ用電極箔の製造方法は、化成工程が完了した陽
極用アルミニウム化成箔の後処理として、前記陽極用ア
ルミニウム化成箔をリン酸アンモニウム塩水溶液に浸漬
し、その後少なくとも200℃以上の温度で熱処理を行う
ようにしたものである。Means for Solving the Problems In order to solve the above problems, the method for producing an electrode foil for an aluminum electrolytic capacitor according to the present invention is a post-treatment of an aluminum conversion foil for an anode in which a conversion step is completed. The chemical conversion foil is immersed in an aqueous solution of ammonium phosphate and then heat-treated at a temperature of at least 200 ° C. or higher.
作用 上記したアルミ電解コンデンサ用電極箔の製造方法に
よれば、化成工程が完了した陽極用アルミニウム化成箔
の後処理として、前記陽極用アルミニウム化成箔をリン
酸アンモニウム塩水溶液に浸漬し、その後少なくとも20
0℃以上の温度で熱処理を行うようにしているため、リ
ン酸アンモニウム塩水溶液への浸漬によって陽極用アル
ミニウム化成箔の表面に付着したリン酸イオンは熱処理
によって陽極用アルミニウム化成箔の表面に耐水性のあ
るリン酸アルミ化合物を生成することになり、これによ
り、リン酸イオンとアルミとの化学的密着性が向上する
ため、従来の方法より化成皮膜の耐水性を向上させるこ
とができるものである。Action According to the method for manufacturing an electrode foil for an aluminum electrolytic capacitor described above, as a post-treatment of the aluminum chemical conversion foil for the anode after the chemical conversion step is completed, the aluminum chemical conversion foil for the anode is immersed in an ammonium phosphate salt aqueous solution, and then at least 20
Since the heat treatment is performed at a temperature of 0 ° C. or higher, the phosphate ions attached to the surface of the aluminum chemical conversion foil for anode by immersion in the ammonium phosphate salt aqueous solution are water resistant to the surface of the aluminum chemical conversion foil for anode. As a result, it is possible to improve the water resistance of the chemical conversion film as compared with the conventional method because the chemical adhesion between the phosphate ion and aluminum is improved. .
また前記リン酸アンモニウム塩水溶液はほぼ中性であ
るため、アルミや化成皮膜を溶解させる作用は極めて小
さく、その結果、化成皮膜の破壊ということはなくなる
ため、前記熱処理を行った後に、化成皮膜修復のための
再化成を行うという必要はなくなるというすぐれた効果
を有するものである。Further, since the ammonium phosphate salt aqueous solution is almost neutral, the effect of dissolving aluminum and the chemical conversion film is extremely small, and as a result, the chemical conversion film is not destroyed. It has an excellent effect that it is not necessary to perform re-formation for.
実施例 以下本発明の一実施例について説明する。Example One example of the present invention will be described below.
化成工程が完了した陽極用アルミニウム化成箔（耐電
圧200V）の後処理として、この陽極用アルミニウム化成
箔をリン酸水溶液に浸漬し、表面にリン酸イオンを付着
させた試料（従来品）と、リン酸アンモニウム塩水溶液
に浸漬して表面にリン酸イオンを付着させた後、400℃
の温度で熱処理を行った試料（本発明品）とを純水中で
100℃でボイルした場合の耐電圧の変化を下の表に示
す。As a post-treatment of the aluminum chemical conversion foil for anodes (withstand voltage 200V) after the chemical conversion process was completed, the aluminum chemical conversion foil for anodes was immersed in a phosphoric acid aqueous solution, and a sample (conventional product) with phosphate ions attached to the surface, After dipping in ammonium phosphate aqueous solution to attach phosphate ion to the surface, 400 ℃
The sample (invention product) heat-treated at the temperature of
The change in withstand voltage when boiled at 100 ° C is shown in the table below.
この表から明らかなように、従来品では、2Hr以上の
純水中のボイルにより耐電圧が低下しているのに対し、
本発明品では、3Hrでも対電圧が低下せず、耐水性が向
上していることがわかる。 As is clear from this table, in the conventional product, the withstand voltage is lowered by boiling in pure water of 2 Hr or more,
It can be seen that in the product of the present invention, the counter voltage does not decrease even at 3 Hr, and the water resistance is improved.
なお、上記一実施例においては、熱処理の温度を400
℃にしたものについて説明したが、この400℃に限定さ
れるものではなく、少なくとも200℃以上の温度は熱処
理の温度としては必要である。In the above example, the heat treatment temperature was set to 400
Although the temperature is set to 400 ° C., the temperature is not limited to 400 ° C., and a temperature of at least 200 ° C. or higher is necessary as the heat treatment temperature.
発明の効果 以上のように本発明のアルミ電解コンデンサ用電極箔
の製造方法は、化成工程が完了した陽極用アルミニウム
化成箔の後処理として、前記陽極用アルミニウム化成箔
をリン酸アンモニウム塩水溶液に浸漬し、その後少なく
とも200℃以上の温度で熱処理を行うようにしているた
め、リン酸アンモニウム塩水溶液への浸漬によって陽極
用アルミニウム化成箔の表面に付着したリン酸イオンは
熱処理によって陽極用アルミニウム化成箔の表面に耐水
性のあるリン酸アルミ化合物を生成することになり、こ
れにより、リン酸イオンとアルミとの化学的密着性が向
上するため、従来の方法より化成皮膜の耐水性を向上さ
せることができるものである。EFFECTS OF THE INVENTION As described above, the method for producing an electrode foil for an aluminum electrolytic capacitor according to the present invention is a post-treatment of the aluminum chemical conversion foil for the anode in which the chemical conversion step is completed, and the aluminum chemical conversion foil for the anode is immersed in an ammonium phosphate salt aqueous solution. However, since the heat treatment is performed at a temperature of at least 200 ° C. or higher, the phosphate ions adhered to the surface of the anode aluminum chemical conversion foil by immersion in the ammonium phosphate salt aqueous solution are treated by the heat treatment to form the anode aluminum chemical foil. This results in the formation of a water-resistant aluminum phosphate compound, which improves the chemical adhesion between phosphate ions and aluminum, and thus improves the water resistance of the chemical conversion film compared to conventional methods. It is possible.
また前記リン酸アンモニウム塩水溶液はほぼ中性であ
るため、アルミや化成皮膜を溶解させる作用は極めて小
さく、その結果、化成皮膜の破壊ということはなくなる
ため、前記熱処理を行った後に、化成皮膜修復のための
再化成を行うという必要はなくなるというすぐれた効果
を有するものである。Further, since the ammonium phosphate salt aqueous solution is almost neutral, the effect of dissolving aluminum and the chemical conversion film is extremely small, and as a result, the chemical conversion film is not destroyed. It has an excellent effect that it is not necessary to perform re-formation for.
───────────────────────────────────────────────────── フロントページの続き (72)発明者 工藤 二三男 大阪府門真市大字門真1006番地 松下電 器産業株式会社内 (72)発明者 島谷 涼一 大阪府門真市大字門真1006番地 松下電 器産業株式会社内 (72)発明者 神崎 信義 大阪府門真市大字門真1006番地 松下電 器産業株式会社内 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Fumio Kudo 1006 Kadoma, Kadoma City, Osaka Prefecture Matsushita Electric Industrial Co., Ltd. (72) Ryoichi Shimatani 1006 Kadoma, Kadoma City, Osaka Matsushita Electric Industrial Co., Ltd. Company (72) Inventor Nobuyoshi Kanzaki 1006 Kadoma, Kadoma City, Osaka Prefecture Matsushita Electric Industrial Co., Ltd.
Claims (1)
成箔の後処理として、前記陽極用アルミニウム化成箔を
リン酸アンモニウム塩水溶液に浸漬し、その後少なくと
も200℃以上の温度で熱処理を行うことを特徴とするア
ルミ電解コンデンサ用電極箔の製造方法。1. As a post-treatment of an aluminum chemical conversion foil for an anode, which has been subjected to a chemical conversion step, the aluminum chemical conversion foil for an anode is immersed in an aqueous solution of ammonium phosphate, and then heat-treated at a temperature of at least 200 ° C. or higher. And a method for manufacturing an electrode foil for an aluminum electrolytic capacitor.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP62169026A JP2523654B2 (en) | 1987-07-07 | 1987-07-07 | Method for manufacturing electrode foil for aluminum electrolytic capacitors |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP62169026A JP2523654B2 (en) | 1987-07-07 | 1987-07-07 | Method for manufacturing electrode foil for aluminum electrolytic capacitors |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS6412512A JPS6412512A (en) | 1989-01-17 |
| JP2523654B2 true JP2523654B2 (en) | 1996-08-14 |
Family
ID=15878949
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP62169026A Expired - Lifetime JP2523654B2 (en) | 1987-07-07 | 1987-07-07 | Method for manufacturing electrode foil for aluminum electrolytic capacitors |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP2523654B2 (en) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH0658870B2 (en) * | 1989-08-03 | 1994-08-03 | 信英通信工業株式会社 | Aluminum electrolytic capacitor |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS6043812A (en) * | 1983-08-19 | 1985-03-08 | 松下電器産業株式会社 | Method of compounding aluminum electrolytic condenser electrode foil |
| JPS62134919A (en) * | 1985-12-09 | 1987-06-18 | 日通工株式会社 | Manufacture of anode foil for aluminum electrolytic capacitor |
-
1987
- 1987-07-07 JP JP62169026A patent/JP2523654B2/en not_active Expired - Lifetime
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS6043812A (en) * | 1983-08-19 | 1985-03-08 | 松下電器産業株式会社 | Method of compounding aluminum electrolytic condenser electrode foil |
| JPS62134919A (en) * | 1985-12-09 | 1987-06-18 | 日通工株式会社 | Manufacture of anode foil for aluminum electrolytic capacitor |
Also Published As
| Publication number | Publication date |
|---|---|
| JPS6412512A (en) | 1989-01-17 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| EXPY | Cancellation because of completion of term | ||
| FPAY | Renewal fee payment (event date is renewal date of database) |
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