DE1178946B - Etching liquid for the electrolytic roughening of aluminum anodes for electrolytic capacitors - Google Patents
Etching liquid for the electrolytic roughening of aluminum anodes for electrolytic capacitorsInfo
- Publication number
- DE1178946B DE1178946B DES53243A DES0053243A DE1178946B DE 1178946 B DE1178946 B DE 1178946B DE S53243 A DES53243 A DE S53243A DE S0053243 A DES0053243 A DE S0053243A DE 1178946 B DE1178946 B DE 1178946B
- Authority
- DE
- Germany
- Prior art keywords
- electrolytic
- etching liquid
- roughening
- aluminum
- aluminum anodes
- 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
- 238000005530 etching Methods 0.000 title claims description 11
- 239000007788 liquid Substances 0.000 title claims description 11
- 238000007788 roughening Methods 0.000 title claims description 10
- 229910052782 aluminium Inorganic materials 0.000 title claims description 8
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 title claims description 8
- 239000003990 capacitor Substances 0.000 title claims description 4
- VEXZGXHMUGYJMC-UHFFFAOYSA-N Hydrochloric acid Chemical compound Cl VEXZGXHMUGYJMC-UHFFFAOYSA-N 0.000 claims description 14
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N silicon dioxide Inorganic materials O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 claims description 14
- VSCWAEJMTAWNJL-UHFFFAOYSA-K aluminium trichloride Chemical compound Cl[Al](Cl)Cl VSCWAEJMTAWNJL-UHFFFAOYSA-K 0.000 claims description 4
- 239000007864 aqueous solution Substances 0.000 claims description 3
- 229910052681 coesite Inorganic materials 0.000 claims description 3
- 239000000084 colloidal system Substances 0.000 claims description 3
- 229910052906 cristobalite Inorganic materials 0.000 claims description 3
- 229910052682 stishovite Inorganic materials 0.000 claims description 3
- 229910052905 tridymite Inorganic materials 0.000 claims description 3
- 229910000041 hydrogen chloride Inorganic materials 0.000 claims description 2
- IXCSERBJSXMMFS-UHFFFAOYSA-N hydrogen chloride Substances Cl.Cl IXCSERBJSXMMFS-UHFFFAOYSA-N 0.000 claims description 2
- 239000000377 silicon dioxide Substances 0.000 description 6
- 229910001510 metal chloride Inorganic materials 0.000 description 3
- 239000003518 caustics Substances 0.000 description 2
- 238000002474 experimental method Methods 0.000 description 2
- 238000004519 manufacturing process Methods 0.000 description 2
- 239000000243 solution Substances 0.000 description 2
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 2
- 108010010803 Gelatin Proteins 0.000 description 1
- 239000004372 Polyvinyl alcohol Substances 0.000 description 1
- 229910004072 SiFe Inorganic materials 0.000 description 1
- LSNNMFCWUKXFEE-UHFFFAOYSA-N Sulfurous acid Chemical compound OS(O)=O LSNNMFCWUKXFEE-UHFFFAOYSA-N 0.000 description 1
- 239000002253 acid Substances 0.000 description 1
- 150000008064 anhydrides Chemical class 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 238000010790 dilution Methods 0.000 description 1
- 239000012895 dilution Substances 0.000 description 1
- 238000005868 electrolysis reaction Methods 0.000 description 1
- 238000005189 flocculation Methods 0.000 description 1
- 230000016615 flocculation Effects 0.000 description 1
- 150000002222 fluorine compounds Chemical class 0.000 description 1
- 239000011888 foil 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
- 239000003292 glue Substances 0.000 description 1
- 239000003864 humus Substances 0.000 description 1
- 239000012535 impurity Substances 0.000 description 1
- 238000011835 investigation Methods 0.000 description 1
- 238000005342 ion exchange Methods 0.000 description 1
- 150000002500 ions Chemical class 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 239000002574 poison Substances 0.000 description 1
- 231100000614 poison Toxicity 0.000 description 1
- 229920002451 polyvinyl alcohol Polymers 0.000 description 1
- 235000019353 potassium silicate Nutrition 0.000 description 1
- 235000012239 silicon dioxide Nutrition 0.000 description 1
- NTHWMYGWWRZVTN-UHFFFAOYSA-N sodium silicate Chemical compound [Na+].[Na+].[O-][Si]([O-])=O NTHWMYGWWRZVTN-UHFFFAOYSA-N 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
- 239000008399 tap water Substances 0.000 description 1
- 235000020679 tap water Nutrition 0.000 description 1
- 239000002699 waste material Substances 0.000 description 1
- 235000020681 well water Nutrition 0.000 description 1
- 239000002349 well water 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)
- Chemical & Material Sciences (AREA)
- Power Engineering (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Electrochemistry (AREA)
- Materials Engineering (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
- Microelectronics & Electronic Packaging (AREA)
- ing And Chemical Polishing (AREA)
Description
Ätzflüssigkeit für die elektrolytische Aufrauhung von Aluminiumanoden für Elektrolytkondensatoren Für die Aufrauhung von Aluminiumanoden werden bekanntlich unter anderem wäßrige Lösungen von Chlorwasserstoff und Metallchloriden als Atzflüssigkeit verwendet. Diese Ätzflüssigkeiten werden aus Leitungswasser und der im Handel befindlichen Salzsäure unter Zugabe eines geeignet erscheinenden Metallchlorids hergestellt.Etching liquid for the electrolytic roughening of aluminum anodes for electrolytic capacitors For the roughening of aluminum anodes are known including aqueous solutions of hydrogen chloride and metal chlorides as etching liquid used. These caustic liquids are made from tap water and those available on the market Hydrochloric acid produced with the addition of a suitable metal chloride.
Versuche zeigten, daß der Aufrauhgrad der Aluminiumoberfläche Schwankungen aufwies, obwohl die für die Aufrauhung bekanntermaßen bestimmenden Einflüsse (Oberflächen- und Materialbeschaffenheit sowie Vorbehandlung des Aluminiums, Badtemperatur, Ätzdauer, Elektrolysedaten und speziell die Salzsäure- und Metallchloridkonzentration der Ätzflüssigkeit) gleichgehalten wurden. Es wurde beobachtet, daß die Schwankungen auftraten, wenn die für die Atzflüssigkeit erforderliche Salzsäure gewechselt wurde. Durch eingehende Untersuchungen des Einflusses von Salzsäureproben verschiedener Herstellerfirmen sowie des Einflusses von natürlichen Verunreinigungen im Verdünnungswasser auf den Aufrauhgrad einer Aluminiumfolie ergab sich folgendes: Die Aufrauhwirkung der Ätzflüssigkeit verschlechtert sich mit steigendem Gehalt an Kieselsäure und an organischen Kolloiden, insbesondere Polyvinylalkohol und Humusstoffen (letztere z. B. von der säurelöslichen Art, wie sie unter anderem in Sulfitablauge oder in damit verunreinigten Wässern vorkommt). Was die Kieselsäure anbetrifft, so ist es wegen der vielen und meist wenig definierten Formen, in denen sie echt gelöst oder kolloid gelöst auftreten kann, im folgenden zweckmäßig, die in einer Lösung befindliche Kieselsäuremenge als Anhydrid, also als Si02, anzugeben. Die Kieselsäure, die bei dem Aufrauhprozeß als Ätzgift anzusprechen ist, kann bei der Salzsäureherstellung mit dem hierfür benötigten Brunnenwasser eingeschleppt werden; auch kann sie aus Wasserglaskitten stammen, die gelegentlich im Säurebau verwendet werden.Experiments showed that the degree of roughness of the aluminum surface fluctuates exhibited, although the influences known to determine the roughening (surface and material properties as well as pretreatment of the aluminum, bath temperature, etching time, Electrolysis data and especially the hydrochloric acid and metal chloride concentration of the Etching liquid) were kept the same. It was observed that the fluctuations occurred when the hydrochloric acid required for the etching liquid was changed. Through detailed investigations of the influence of hydrochloric acid samples of various Manufacturing companies as well as the influence of natural impurities in the dilution water The following was found on the degree of roughening of an aluminum foil: The roughening effect the etching liquid deteriorates with increasing silica and of organic colloids, especially polyvinyl alcohol and humus substances (the latter z. B. of the acid-soluble type, such as in sulfite waste liquor or in contaminated water occurs). As for silica, it is because of the many and mostly poorly defined forms in which they are genuinely solved or Colloidly dissolved can occur, in the following expediently, those located in a solution Specify the amount of silica as anhydride, i.e. as Si02. The silica that is used in The roughening process is to be addressed as a caustic poison, can in the production of hydrochloric acid be brought in with the well water required for this; she can also look Water glass kittens come from, which are occasionally used in acid construction.
Um einen möglichst hohen und gleichmäßigen Aufrauhgrad zu erhalten, wird auf Grund der Versuche vorgeschlagen, eine Ätzflüssigkeit, insbesondere eine wäßrige Lösung von Salzsäure und Aluminiumchlorid, zum elektrolytischen Aufrauhen von Aluminiumanoden für Elektrolytkondensatoren zu verwenden, die erfindungsgemäß derart ausgewählt, hergestellt oder behandelt ist, daß höchstens 0,05 g Si02 und höchstens 0,1 g organische Kolloide pro Liter Ätzflüssigkeit vorhanden sind.In order to obtain the highest possible and even degree of roughening, is proposed on the basis of the experiments, an etching liquid, in particular a aqueous solution of hydrochloric acid and aluminum chloride, for electrolytic roughening of aluminum anodes for electrolytic capacitors to be used according to the invention is selected, manufactured or treated such that at most 0.05 g SiO2 and no more than 0.1 g of organic colloids per liter of etching liquid are present.
Eine gegebenenfalls erforderliche Behandlung zur Entfernung von Kieselsäure gelingt in bekannter Weise z. B. durch Ausflockung mit Gelatine- oder Leimlösung oder durch Ionenaustauschverfahren, notfalls unter Zusatz von Fluoriden zur Erzeugung des austauschfähigen Ions (SiFe).Any treatment required to remove silica succeeds in a known manner z. B. by flocculation with gelatin or glue solution or by ion exchange processes, if necessary with the addition of fluorides for generation the exchangeable ion (SiFe).
Claims (1)
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DES53243A DE1178946B (en) | 1957-04-24 | 1957-04-24 | Etching liquid for the electrolytic roughening of aluminum anodes for electrolytic capacitors |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DES53243A DE1178946B (en) | 1957-04-24 | 1957-04-24 | Etching liquid for the electrolytic roughening of aluminum anodes for electrolytic capacitors |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| DE1178946B true DE1178946B (en) | 1964-10-01 |
Family
ID=7489155
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| DES53243A Pending DE1178946B (en) | 1957-04-24 | 1957-04-24 | Etching liquid for the electrolytic roughening of aluminum anodes for electrolytic capacitors |
Country Status (1)
| Country | Link |
|---|---|
| DE (1) | DE1178946B (en) |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US2193711A (en) * | 1937-12-14 | 1940-03-12 | Sprague Specialties Co | Electrolytic device |
| CH280488A (en) * | 1947-09-24 | 1952-01-31 | Soc D Produits Chimiques Des T | Process for brightening the surface of an object made of aluminum or aluminum alloy. |
| DE757309C (en) * | 1936-04-28 | 1954-08-02 | Siemens & Halske A G | Process for the treatment of electrodes, in particular for electrolytic capacitors |
-
1957
- 1957-04-24 DE DES53243A patent/DE1178946B/en active Pending
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE757309C (en) * | 1936-04-28 | 1954-08-02 | Siemens & Halske A G | Process for the treatment of electrodes, in particular for electrolytic capacitors |
| US2193711A (en) * | 1937-12-14 | 1940-03-12 | Sprague Specialties Co | Electrolytic device |
| CH280488A (en) * | 1947-09-24 | 1952-01-31 | Soc D Produits Chimiques Des T | Process for brightening the surface of an object made of aluminum or aluminum alloy. |
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