DE1170749B - Liquid suitable for roughening aluminum electrodes for electrolytic capacitors - Google Patents
Liquid suitable for roughening aluminum electrodes for electrolytic capacitorsInfo
- Publication number
- DE1170749B DE1170749B DES69065A DES0069065A DE1170749B DE 1170749 B DE1170749 B DE 1170749B DE S69065 A DES69065 A DE S69065A DE S0069065 A DES0069065 A DE S0069065A DE 1170749 B DE1170749 B DE 1170749B
- Authority
- DE
- Germany
- Prior art keywords
- electrolytic capacitors
- hydrochloric acid
- roughening
- aluminum electrodes
- liquid suitable
- 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
- 238000007788 roughening Methods 0.000 title claims description 9
- 229910052782 aluminium Inorganic materials 0.000 title claims description 6
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 title claims description 6
- 239000003990 capacitor Substances 0.000 title claims description 5
- 239000007788 liquid Substances 0.000 title claims 2
- VEXZGXHMUGYJMC-UHFFFAOYSA-N Hydrochloric acid Chemical compound Cl VEXZGXHMUGYJMC-UHFFFAOYSA-N 0.000 claims description 22
- 229910052753 mercury Inorganic materials 0.000 claims description 5
- 238000004519 manufacturing process Methods 0.000 claims description 2
- -1 mercury ions Chemical class 0.000 claims description 2
- 238000011109 contamination Methods 0.000 claims 1
- 238000000034 method Methods 0.000 description 5
- QSHDDOUJBYECFT-UHFFFAOYSA-N mercury Chemical compound [Hg] QSHDDOUJBYECFT-UHFFFAOYSA-N 0.000 description 3
- 239000000654 additive Substances 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 239000012535 impurity Substances 0.000 description 2
- 229910052751 metal Inorganic materials 0.000 description 2
- 239000002184 metal Substances 0.000 description 2
- 239000012530 fluid Substances 0.000 description 1
- 238000011835 investigation Methods 0.000 description 1
- 229910000510 noble metal Inorganic materials 0.000 description 1
- 239000002994 raw material Substances 0.000 description 1
Classifications
-
- C—CHEMISTRY; METALLURGY
- C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
- C23F—NON-MECHANICAL REMOVAL OF METALLIC MATERIAL FROM SURFACE; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL; MULTI-STEP PROCESSES FOR SURFACE TREATMENT OF METALLIC MATERIAL INVOLVING AT LEAST ONE PROCESS PROVIDED FOR IN CLASS C23 AND AT LEAST ONE PROCESS COVERED BY SUBCLASS C21D OR C22F OR CLASS C25
- C23F1/00—Etching metallic material by chemical means
- C23F1/10—Etching compositions
- C23F1/14—Aqueous compositions
- C23F1/16—Acidic compositions
- C23F1/20—Acidic compositions for etching aluminium or alloys thereof
Landscapes
- Chemical & Material Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- General Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Materials Engineering (AREA)
- Mechanical Engineering (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
- ing And Chemical Polishing (AREA)
Description
Zum Aufrauhen von Aluminiumelektroden für Elektrolytkondensatoren geeignete Flüssigkeit Die Erfindung betrifft zum Aufrauhen von Aluminiumelektroden für Elektrolytkondensatoren im technischen Großverfahren geeignete technisch reine Salzsäure, die Verunreinigungen durch kleine Mengen von Fremdstoffen enthält, mit der ein möglichst hoher und gleichmäßiger Rauhfaktor erzielt wird. Die zur Herstellung von Elektrolytkondensatoren verwendeten Aluminiumbänder werden zur Vergrößerung ihrer kapazitiv wirksamen Oberfläche vor ihrer weiteren Verarbeitung einem Aufrauhverfahren unterzogen. Dieses ist üblicherweise als Wanderverfahren ausgebildet, wobei die Bänder vorzugsweise unter Stromeinfluß durch ein Bad aus Salzsäure geführt werden. Zur Durchführung dieses Verfahrens wird selbstverständlich aus wirtschaftlichen Gründen nicht chemisch reine Salzsäure verwendet, sondern eine handelsübliche technische Qualität, die noch verschiedene Verunreinigungen enthält. Die Menge und Art dieser Verunreinigungen sind außerdem auch nicht in jedem Falle gleich.For roughening aluminum electrodes for electrolytic capacitors Suitable Fluid The invention relates to roughening aluminum electrodes technically pure, suitable for electrolytic capacitors in large-scale technical processes Hydrochloric acid, which contains small amounts of foreign matter contaminated with which achieves the highest possible and even roughness factor. The one used to manufacture Aluminum tapes used by electrolytic capacitors are used for magnification their capacitively effective surface a roughening process before their further processing subjected. This is usually designed as a walking process, with the Ribbons are preferably passed through a bath of hydrochloric acid under the influence of current. To carry out this process is of course economical For reasons, chemically pure hydrochloric acid is not used, but a commercially available technical one Quality that still contains various impurities. The amount and type of this Furthermore, impurities are not always the same.
Es ist auch bekannt, der zum Aufrauhen verwendeten Salzsäure Zusätze zuzufügen, die die Angriffswirkung auf die Metalloberfläche erhöhen, oder die Metalloberfläche hierzu mit einem edleren Metall in Berührung zu bringen. Von derartigen Zusätzen wird bei der Erfindung nicht Gebrauch gemacht. Vielmehr soll die Aufrauhwirkung der Salzsäure an sich ausgenutzt werden. Man hat nun festgestellt, daß der Raubfaktor der verschiedenen derart gerauhten Aluminiumbänder nicht bei allen Bändern der gleiche ist, sondern Streuungen unterworfen ist. Auf Grund von Vermutungen wurden daraufhin Untersuchungen durchgeführt, die den Einfluß der Quecksilberkonzentration der Salzsäure auf die Aufrauhung klären sollten. Es stellte sich dabei heraus, daß ein solcher Einfiuß besteht und daß mit steigender Quecksilberkonzentration der Salzsäure der Rauhfaktor der damit gerauhten Bänder fällt.It is also known the hydrochloric acid additives used for roughening add, which increase the attack effect on the metal surface, or the metal surface to bring this into contact with a more noble metal. Such additives is not used in the invention. Rather, the roughening effect should the hydrochloric acid can be used per se. It has now been established that the predatory factor of the various aluminum strips roughened in this way are not the same for all strips is, but is subject to scatter. On the basis of assumptions were thereupon Investigations carried out the influence of the mercury concentration of the hydrochloric acid should clarify the roughening. It turned out that such a Influence exists and that with increasing mercury concentration of hydrochloric acid the The roughness factor of the ribbons roughened with it falls.
Um diesen schädlichen Einfluß auszuschalten und dadurch zu möglichst hohen Rauhfaktoren zu gelangen, wird daher ein Salzsäurerauhbad vorgeschlagen, das erfindungsgemäß weniger als 25 - 10-g g Quecksilberionen in einem Liter konzentrierter Salzsäure enthält. Bei einem geringeren als dem angegebenen Quecksilbergehalt konnte man keine meßbare Verringerung des Rauhfaktors mehr feststellen. Nach Befolgung dieser Lehre wurde bei sonst gleichen Rohstoffen und Verfahrensbedingungen ein stets gleichbleibend hoher Rauhfaktor der Bänder gemessen.In order to eliminate this harmful influence and thereby as much as possible To get high roughness factors, a hydrochloric acid roughening bath is therefore proposed according to the invention less than 25-10 g of mercury ions in one liter more concentrated Contains hydrochloric acid. With a lower than the specified mercury content could one can no longer detect any measurable reduction in the roughness factor. After compliance this teaching has always been a constant with the same raw materials and process conditions consistently high roughness factor of the strips measured.
Claims (1)
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DES69065A DE1170749B (en) | 1960-06-23 | 1960-06-23 | Liquid suitable for roughening aluminum electrodes for electrolytic capacitors |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DES69065A DE1170749B (en) | 1960-06-23 | 1960-06-23 | Liquid suitable for roughening aluminum electrodes for electrolytic capacitors |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| DE1170749B true DE1170749B (en) | 1964-05-21 |
Family
ID=7500707
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| DES69065A Pending DE1170749B (en) | 1960-06-23 | 1960-06-23 | Liquid suitable for roughening aluminum electrodes for electrolytic capacitors |
Country Status (1)
| Country | Link |
|---|---|
| DE (1) | DE1170749B (en) |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US2033444A (en) * | 1932-12-02 | 1936-03-10 | Nisizawa Yusiti | Method of etching aluminum |
| US2052962A (en) * | 1934-12-31 | 1936-09-01 | Mallory & Co Inc P R | Process of etching |
-
1960
- 1960-06-23 DE DES69065A patent/DE1170749B/en active Pending
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US2033444A (en) * | 1932-12-02 | 1936-03-10 | Nisizawa Yusiti | Method of etching aluminum |
| US2052962A (en) * | 1934-12-31 | 1936-09-01 | Mallory & Co Inc P R | Process of etching |
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