DE962621C - Process for roughening the surface of an electrode, especially for electrolytic capacitors - Google Patents
Process for roughening the surface of an electrode, especially for electrolytic capacitorsInfo
- Publication number
- DE962621C DE962621C DES6975D DES0006975D DE962621C DE 962621 C DE962621 C DE 962621C DE S6975 D DES6975 D DE S6975D DE S0006975 D DES0006975 D DE S0006975D DE 962621 C DE962621 C DE 962621C
- Authority
- DE
- Germany
- Prior art keywords
- electrode
- roughening
- electrolytic capacitors
- diaphragm
- cathode
- 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
Links
- 238000000034 method Methods 0.000 title claims description 6
- 238000007788 roughening Methods 0.000 title claims description 4
- 239000003990 capacitor Substances 0.000 title claims description 3
- 238000005530 etching Methods 0.000 claims description 6
- 229920000298 Cellophane Polymers 0.000 claims 1
- 229910010293 ceramic material Inorganic materials 0.000 claims 1
- 230000005518 electrochemistry Effects 0.000 claims 1
- VEXZGXHMUGYJMC-UHFFFAOYSA-N Hydrochloric acid Chemical compound Cl VEXZGXHMUGYJMC-UHFFFAOYSA-N 0.000 description 4
- 239000002253 acid Substances 0.000 description 3
- 239000000203 mixture Substances 0.000 description 3
- FAPWRFPIFSIZLT-UHFFFAOYSA-M Sodium chloride Chemical compound [Na+].[Cl-] FAPWRFPIFSIZLT-UHFFFAOYSA-M 0.000 description 2
- VSCWAEJMTAWNJL-UHFFFAOYSA-K aluminium trichloride Chemical compound Cl[Al](Cl)Cl VSCWAEJMTAWNJL-UHFFFAOYSA-K 0.000 description 2
- IOLCXVTUBQKXJR-UHFFFAOYSA-M potassium bromide Chemical compound [K+].[Br-] IOLCXVTUBQKXJR-UHFFFAOYSA-M 0.000 description 2
- 108010010803 Gelatin Proteins 0.000 description 1
- 150000007513 acids Chemical class 0.000 description 1
- 229910052782 aluminium Inorganic materials 0.000 description 1
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 1
- WNROFYMDJYEPJX-UHFFFAOYSA-K aluminium hydroxide Chemical compound [OH-].[OH-].[OH-].[Al+3] WNROFYMDJYEPJX-UHFFFAOYSA-K 0.000 description 1
- 239000000919 ceramic Substances 0.000 description 1
- 239000003795 chemical substances by application Substances 0.000 description 1
- 238000000866 electrolytic etching Methods 0.000 description 1
- 239000004744 fabric Substances 0.000 description 1
- 229920000159 gelatin Polymers 0.000 description 1
- 239000008273 gelatin Substances 0.000 description 1
- 235000019322 gelatine Nutrition 0.000 description 1
- 235000011852 gelatine desserts Nutrition 0.000 description 1
- 150000002366 halogen compounds Chemical class 0.000 description 1
- 239000007788 liquid Substances 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 229910052751 metal Inorganic materials 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- VKJKEPKFPUWCAS-UHFFFAOYSA-M potassium chlorate Chemical compound [K+].[O-]Cl(=O)=O VKJKEPKFPUWCAS-UHFFFAOYSA-M 0.000 description 1
- 239000011833 salt mixture Substances 0.000 description 1
- 150000003839 salts Chemical class 0.000 description 1
- 239000011780 sodium chloride Substances 0.000 description 1
- 239000004753 textile Substances 0.000 description 1
Classifications
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01G—CAPACITORS; CAPACITORS, RECTIFIERS, DETECTORS, SWITCHING DEVICES, LIGHT-SENSITIVE OR TEMPERATURE-SENSITIVE DEVICES OF THE ELECTROLYTIC TYPE
- H01G9/00—Electrolytic capacitors, rectifiers, detectors, switching devices, light-sensitive or temperature-sensitive devices; Processes of their manufacture
- H01G9/004—Details
- H01G9/04—Electrodes or formation of dielectric layers thereon
- H01G9/048—Electrodes or formation of dielectric layers thereon characterised by their structure
- H01G9/055—Etched foil electrodes
-
- C—CHEMISTRY; METALLURGY
- C25—ELECTROLYTIC OR ELECTROPHORETIC PROCESSES; APPARATUS THEREFOR
- C25F—PROCESSES FOR THE ELECTROLYTIC REMOVAL OF MATERIALS FROM OBJECTS; APPARATUS THEREFOR
- C25F3/00—Electrolytic etching or polishing
- C25F3/02—Etching
- C25F3/04—Etching of light metals
Landscapes
- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Chemical & Material Sciences (AREA)
- Microelectronics & Electronic Packaging (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Electrochemistry (AREA)
- Materials Engineering (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
- ing And Chemical Polishing (AREA)
Description
Durch das Hauptpatent 756216 ist ein elektrolytisches Verfahren zum Aufrauhen der Oberfläche einer Elektrode, insbesondere für elektrolytische Kondensatoren, unter Schutz gestellt, das dadurch gekennzeichnet ist, daß Salz- und Säuregemische oder Salzgemische angewendet werden, die das Elektrodenmetall im stromlosen Zustand der Ätzanlage gar nicht oder nur schwach angreifen. Bei diesem Verfahren kann insbesondere die aufzurauhende Elektrode an den Pluspol gelegt werden.The main patent 756216 is an electrolytic Process for roughening the surface of an electrode, especially for electrolytic Capacitors, placed under protection, which is characterized in that salt and acid mixtures or salt mixtures are used, which the electrode metal in the currentless state of the etching system Do not attack at all or only weakly. With this method, in particular the Electrode to be placed on the positive pole.
Es ist nun festgestellt worden, daß in der Nähe der Kathode Rückstände auftreten, die bei Verwendung von Aluminium meistens aus Aluminiumhydroxyd bestehen. Diese Rückstände bilden sich besonders dann aus, wenn der pH-Wert der Lösung einen Wert über 7 annimmt. Um den notwendigen Säuregrad zu erreichen, war es daher erforderlich, im Laufe des Verfahrens der Ätzlösung Säure, z. B. Salzsäure, zuzugeben.It has now been found that residues occur in the vicinity of the cathode which, when aluminum is used, mostly consist of aluminum hydroxide. These residues are formed from especially when the pH value assumes a value more than 7 of the solution. In order to achieve the necessary degree of acidity, it was therefore necessary in the course of the process of the etching solution acid, e.g. B. hydrochloric acid to add.
Um diesen Übelstand zu vermeiden, wird nun gemäß der Erfindung das Ätzbad in an sich bekannter Weise durch ein 'Diaphragma in einen Kathoden- und einen Anodenraum getrennt. Als Diaphragma eignet sich insbesondere ein Stoff aus Textilien, wie Makogewebe o. ä., Keramik, Zello- as phan, tierischen Häuten, Gelatine od. dgl.In order to avoid this inconvenience, the etching bath is now known per se according to the invention Way separated by a 'diaphragm into a cathode and an anode compartment. as A material made of textiles, such as maco fabric or the like, ceramics, cellosis, is particularly suitable for the diaphragm phan, animal skins, gelatin or the like.
709 533/340709 533/340
Bei der Verwendung eines Diaphragmas ergibt es sich, daß die Ätzmittel im Anodenraum sauber bleiben, da die Rückstände selbst im Kathodenraum aufgefangen werden. Dadurch sind Einsparungen an Badflüssigkeit erreicht, denn bei dem Brauchbarwerden der Füllung ist nur die Auswechslung des Kathodenraumes nötig.When using a diaphragm, the result is that the etchant in the anode compartment is clean stay, as the residues are caught in the cathode compartment. This results in savings reached in bath liquid, because when the filling becomes usable, only the replacement is necessary of the cathode compartment is necessary.
Als Ätzmittel für die elektrolytische Ätzung mit dazwischengeschaltetem Diaphragma eignen sich Halogenverbindungen, wie Aluminiumchlorid, Natriumchlorid, Kaliumbromid, Kaliumchlorat od. dgl., allein oder im Gemisch mit Säuren, z. B. mit Salzsäure. Derartige Ätzmittel sind im Hauptpatent 756216 in genaueren Zusammensetzungen angegeben.Suitable etching agents for electrolytic etching with an interposed diaphragm are suitable Halogen compounds such as aluminum chloride, sodium chloride, potassium bromide, potassium chlorate Od. Like., Alone or in a mixture with acids, z. B. with hydrochloric acid. Such etchants are in the main patent 756216 given in more precise compositions.
Claims (2)
Deutsche Patentschriften Nr. 58133, 650191, 753;Considered publications:
German Patent Nos. 58133, 650191, 753;
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DES6975D DE962621C (en) | 1937-06-26 | 1938-08-12 | Process for roughening the surface of an electrode, especially for electrolytic capacitors |
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DES7049D DE932853C (en) | 1937-06-26 | 1937-06-26 | Process for roughening the surface of an electrode, especially for electrolytic capacitors |
| DES6975D DE962621C (en) | 1937-06-26 | 1938-08-12 | Process for roughening the surface of an electrode, especially for electrolytic capacitors |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| DE962621C true DE962621C (en) | 1957-06-06 |
Family
ID=25994766
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| DES6975D Expired DE962621C (en) | 1937-06-26 | 1938-08-12 | Process for roughening the surface of an electrode, especially for electrolytic capacitors |
Country Status (1)
| Country | Link |
|---|---|
| DE (1) | DE962621C (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US3316164A (en) * | 1964-04-23 | 1967-04-25 | Sprague Electric Co | Etching of aluminum foil |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE58133C (en) * | Dr. C. HOEPFNER in Giefsen | Apparatus for electrometallurgical work | ||
| DE563753C (en) * | 1930-04-06 | 1932-11-09 | Siemens Schuckertwerke Akt Ges | Process for removing electrolytes such as soluble salts and the like Like., made of fibers for electrical insulation purposes |
| GB439479A (en) * | 1935-08-27 | 1935-12-06 | Claude Douglas Gwinn | Improvements in or relating to electrolytic condensers |
| GB444231A (en) * | 1934-05-15 | 1936-03-17 | Plessey Co Ltd | Improvements in and relating to electrolytic condensers |
| DE650191C (en) * | 1933-01-25 | 1937-09-16 | Bullard Company | Process for the electrolytic cleaning of workpieces made of steel and iron |
-
1938
- 1938-08-12 DE DES6975D patent/DE962621C/en not_active Expired
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE58133C (en) * | Dr. C. HOEPFNER in Giefsen | Apparatus for electrometallurgical work | ||
| DE563753C (en) * | 1930-04-06 | 1932-11-09 | Siemens Schuckertwerke Akt Ges | Process for removing electrolytes such as soluble salts and the like Like., made of fibers for electrical insulation purposes |
| DE650191C (en) * | 1933-01-25 | 1937-09-16 | Bullard Company | Process for the electrolytic cleaning of workpieces made of steel and iron |
| GB444231A (en) * | 1934-05-15 | 1936-03-17 | Plessey Co Ltd | Improvements in and relating to electrolytic condensers |
| GB439479A (en) * | 1935-08-27 | 1935-12-06 | Claude Douglas Gwinn | Improvements in or relating to electrolytic condensers |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US3316164A (en) * | 1964-04-23 | 1967-04-25 | Sprague Electric Co | Etching of aluminum foil |
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