DE926973C - Process for cleaning etched electrodes, in particular for use in electrolytic capacitors - Google Patents

Process for cleaning etched electrodes, in particular for use in electrolytic capacitors

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Publication number
DE926973C
DE926973C DES18494A DES0018494A DE926973C DE 926973 C DE926973 C DE 926973C DE S18494 A DES18494 A DE S18494A DE S0018494 A DES0018494 A DE S0018494A DE 926973 C DE926973 C DE 926973C
Authority
DE
Germany
Prior art keywords
cleaning
electrodes
remove
procedure
electrolytic capacitors
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
Application number
DES18494A
Other languages
German (de)
Inventor
Joachim Dr-Ing Kleffner
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Siemens AG
Original Assignee
Siemens AG
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Siemens AG filed Critical Siemens AG
Priority to DES18494A priority Critical patent/DE926973C/en
Application granted granted Critical
Publication of DE926973C publication Critical patent/DE926973C/en
Expired legal-status Critical Current

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Classifications

    • HELECTRICITY
    • H01ELECTRIC ELEMENTS
    • H01GCAPACITORS; CAPACITORS, RECTIFIERS, DETECTORS, SWITCHING DEVICES, LIGHT-SENSITIVE OR TEMPERATURE-SENSITIVE DEVICES OF THE ELECTROLYTIC TYPE
    • H01G9/00Electrolytic capacitors, rectifiers, detectors, switching devices, light-sensitive or temperature-sensitive devices; Processes of their manufacture
    • H01G9/004Details
    • H01G9/04Electrodes or formation of dielectric layers thereon

Landscapes

  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Microelectronics & Electronic Packaging (AREA)
  • Water Treatment By Electricity Or Magnetism (AREA)

Description

Verfahren zur Reinigung von geätzten Elektroden, insbesondere zur Verwendung in elektrolytischen Kondensatoren 'Es ist bekannt, zur Reinigung von geätzten Elektroden, insbesondere zur Verwendung in elektrolytischerr Kondensatoren, die Elektroden vorzugsweise unter Verwendung mindestens eines Diaphragm.as der Wirkung eines elektrischen Gleichstromes nuszusetzeri,, d. h. die Erscheinung der Elelktroasmose zur Entfernung der Ätzprodukte, vorzugsweise der Chlorionen, ,anzuwenden. Bei diesem Vertalhren :kann der Fall eintreten; daß die Reinigung der geätzten Elektroden nicht bis zu dem erwünscihten Grad @durchgeführt ist, sondern insofern unvollkommen bleibt, als in den Poren der Elcktroden ein,Sdhl:amm@rückstand:verbleibt. Dieser rührt davon her, daß z. B. die Aluminiumkationen im Kathodentraum hydrolisderen und, einte un, erwünschte gallertartige Ausfällung bilden" welche zum Teil in den Poren verbleibt un .d zum Teil auf der Badoberfläche in der Nähe der Elektroden sich ansammelt und bei der Herausführu,ng der Elektroden von diesen mitgenommen wird. und später nm Trockenturm zu -Tonerdehy@draten mit verschiedenem Wassergehalt auftrocknet. Um diesen Nachteil zu vermeiden, und. Bauch eine Reinigung der Elektroden zu erzielen, wird erfindungsgemäß vorges:chlragen,außer der bekannten elektroosmotiischen Reinigung zur Beseitigung der korrodderenden Anionen noch eineweitere elekbroosimotnscheRe,in!igung zur Entfernung der verschmutzenden Kationen vorz,unehimen.Process for cleaning etched electrodes, in particular for Use in electrolytic capacitors' It is known for cleaning etched electrodes, especially for use in electrolytic capacitors, the electrodes preferably using at least one diaphragm.as the effect an electric direct current nuszusetzeri ,, d. H. the phenomenon of electroasmosis to remove the etching products, preferably the chlorine ions. With this one Vertalhren: can the case occur; that cleaning the etched electrodes does not is carried out up to the desired degree @, but remains imperfect to the extent that than in the pores of the electric electrodes, Sdhl: amm @ residue: remains. This stems from it her that z. B. hydrolyze the aluminum cations in the cathode space and, unite, desired gelatinous precipitate "which partly remains in the pores and .d partly accumulates on the bath surface in the vicinity of the electrodes and when the electrodes are taken out, they are taken along. and later nm Drying tower to -Tonerdehy @ draten with different water content dries up. Around to avoid this disadvantage, and. To achieve cleaning of the electrodes, is proposed according to the invention, except for the known electroosmotic cleaning to eliminate the corrosive anions a further elecbroosimotnscheRe, in! vorz, unehimen to remove the polluting cations.

Die osmotiische Reinigung zur Entfernung der verschmutzenden Kationen kann ,so durchgeführt werden, daß anschliießend an die Elelctroo:smose zur Beseitigung der korrodierenden- Anionen, bei der die zu reinigenden Elektroden am negativen Spannungspal liegen, diese Elektroden durch ein z. B. mit destilliertem Wasser gefülltes Bad geführt wenden, wobei letzteres :am negativen und die Elektroeden am positiven Spannungspol liegen. Da- durch wird der in den Poren -der geätzten Elek- troden vorhandene Schlamm herausgelöst, so daß bei der .späteren Formierung .auch .die geätzten Elektroden im ihren Poren sicher mit einer Fornnie- rungsschidht Überzogen werden. Dies wurde vor- her nicht immer in, zufriedenstel.lender Weise er- zieIt. Vielmehr :deckten die verunreinigenden Be- standieide die Elekbroidenoberfläche in den Poren ab, so @daß eine ,derart verunreinigte Elektrode bei der Formierung unter Umständen Störungen .im Hochvolbbad --bei höheren, Temperaturen verur- sacht, wobei die bekannten Kipperscheinungen (Zu- -sammenbredhen der FoxmieTungs,s:pannung) auf- traten:, die @drax@auf zurückzuführen sind, daß durch E.nbgasungs- .und Lösungsvorgänge bisher @dwrch Schlamm verdeckte Stellen, die lm Niedervolbbad noch :nicht an; der Formierung teidgenommenhatten, plötzlich freigedegt wurden. Dies wird durch das erfindungsgemäße Verfrahren infolge Entfernung des Schlammes ,aus den Poren vermieden. Demnach bringt das, erfnvdungsgemüße Verfahren den Vox- teil mit sich, daß eine gleichmäßige Formierung der geätzten. Elektroden erzielt wird: Die mtit so :gereinigter Folie 'hergestellten Ele'k- trolytkondensatorennr haben eine uni io°/o höhere Kapazität u nd einen um 2 bis 8 % geringeren Ver- lustwsukeL im Vergleich mit einfach osmoti-sch ge- reinigte Folien bektzemden Elektrolytikonden- sataren. Setzt man: dem ans sich sehr schlecht leitenden destililieTten Wasser beispielsweise noch schwache formierende Säuren, z. B. Zitronensäure, Wein. säure od. 4crl., zu, so kann mit der edektroosmotisehen Kationenbeseitigung gleichzeitig eine Vorfoxnnierung erfolgen.The osmotic cleaning to remove the polluting cations can be carried out in such a way that following the Elelctroo: smose to remove the corrosive anions, in which the electrodes to be cleaned are at the negative voltage pal, these electrodes by a z. B. led bath filled with distilled water apply, with the latter: on the negative and the Electrodes are on the positive voltage pole. There- through is the in the pores of the etched elec- troden existing sludge dissolved out so that in the .later formation .also .the etched Electrodes securely in their pores with a fornie rungsschidht be covered. This has been not always in a satisfactory way. GOAL. Rather: covered the contaminating standieide the Elekbroidenfläche in the pores from, so @ that such a contaminated electrode at the formation under certain circumstances disturbances Hochvolbbad - at higher, temperatures cause gently, whereby the well-known tilting phenomena - Bringing together the FoxmieTungs, s: tension) occurred: who @ drax @ are due to that by E.bgassing and solution processes so far @dwrch Mud-covered areas that lm the low-volatility bath still: not on; took part in the formation, were suddenly exposed. This is made possible by the Procedure according to the invention as a result of removal of the sludge, avoided from the pores. Therefore the method according to the invention brings the Vox- part with itself that a uniform formation the etched. Electrodes is achieved: The elec- Trolyte capacitors have a uni% higher Capacity and a 2 to 8% lower consumption LustwsukeL in comparison with simply osmotic cleaned foils containing electrolytic conden- satars. If you put: what is very poorly conducting Distilled water, for example, is still weak forming acids, e.g. B. citric acid, wine. acid or 4crl., a pre-foaming can take place at the same time as the electroosmotic cation elimination.

Claims (1)

PATENTANSPRÜCHE: i. Verfahren, zur Reinigung von geätzten Elektroden, insbesondere zur Verwendung in eledebrolytisehen; Kondensatoren, dadurch ge- kenm,zeichnet, daß außer edier elektroosmo- bi@schen Reinigung der Elektroden zur Beseiti- gung der korrodierenden Anionen noch eine weitere elektroosmobiscJhe Reinigung zur Ent- fernung von verschmutzenden Kationen vor- genommen wird. z. Verfalhren nadh Anspruch i, dadurdh, ge- kennzeichnet, daß zur Entfernung der ver- schmutzenden Kaliionen die am positiven Span- nurvgspöd liegendem, Ele'kbrode-n, durch ein, z. B. mit äesbitliertem Wasser gefülltes, am nega- tiven liegendes Bad geführt werden. 3. Verfahren. mach Anspruch:2, sdadurch ge- kennz,ei:chnet, daß -dem. Biad noch schwache for- mierende Säuren, z. B. Zitronensäure, Wein- säure oid.,d@gl., zur Vorfornnierumg zugesetzt werden.
Angezogene Druckschriften: Deutsöhe Patentschrift Nr. 680 79.3; USA.-Patentschri.ft Nrc. 1986779; Zeitsohrn,ft für anorgannisdhe Chemie, Bd. 188, 1930 S.357 bis 395.
PATENT CLAIMS: i. Method of cleaning etched Electrodes, especially for use in eledebrolytisehen; Capacitors, thereby kenm, draws that apart from edier electroosmo- biological cleaning of the electrodes to remove the corrosive anions further electro-osmotic cleaning to remove removal of polluting cations is taken. z. Procedure nadh claim i, dadurdh, ge indicates that to remove the dirty potassium ions that have the most positive tension nurvgspöd lying, Ele'kbrode-n, by a, z. B. filled with de-aerated water, on the negative tive recumbent bath will. 3. Procedure. make a claim: 2, s kennz, ei: chnet that -dem. Biad still weak for- mating acids, e.g. B. citric acid, tartaric acid acid oid., d @ gl., added for preforming will.
Referred publications: German Patent No. 680 79.3; USA.-Patent No. c. 1986779; Zeitsohrn, ft für anorgannisdhe Chemie, Vol. 188, 1930 pp. 357 to 395.
DES18494A 1950-08-12 1950-08-12 Process for cleaning etched electrodes, in particular for use in electrolytic capacitors Expired DE926973C (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
DES18494A DE926973C (en) 1950-08-12 1950-08-12 Process for cleaning etched electrodes, in particular for use in electrolytic capacitors

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DES18494A DE926973C (en) 1950-08-12 1950-08-12 Process for cleaning etched electrodes, in particular for use in electrolytic capacitors

Publications (1)

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DE926973C true DE926973C (en) 1955-04-28

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1116822B (en) * 1957-08-09 1961-11-09 Siemens Ag Process for improving the anodic electrode provided with a formed oxide layer for an electrolytic capacitor

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1986779A (en) * 1934-02-14 1935-01-01 Ergon Res Lab Inc Electrolytic condenser and electrolyte therefor
DE680793C (en) * 1936-12-23 1939-09-07 Siemens & Halske Akt Ges Process for cleaning etched electrodes, in particular for use in electrolytic capacitors

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1986779A (en) * 1934-02-14 1935-01-01 Ergon Res Lab Inc Electrolytic condenser and electrolyte therefor
DE680793C (en) * 1936-12-23 1939-09-07 Siemens & Halske Akt Ges Process for cleaning etched electrodes, in particular for use in electrolytic capacitors

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1116822B (en) * 1957-08-09 1961-11-09 Siemens Ag Process for improving the anodic electrode provided with a formed oxide layer for an electrolytic capacitor

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