US2912369A - Fabrication of etched foils for electrolytic capacitors - Google Patents

Fabrication of etched foils for electrolytic capacitors Download PDF

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Publication number
US2912369A
US2912369A US524784A US52478455A US2912369A US 2912369 A US2912369 A US 2912369A US 524784 A US524784 A US 524784A US 52478455 A US52478455 A US 52478455A US 2912369 A US2912369 A US 2912369A
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US
United States
Prior art keywords
etched
aluminum
electrode
electrolytic capacitors
foil
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
Application number
US524784A
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English (en)
Inventor
Altenpohl Dietrich
Emler Friedrich
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.)
Constellium Singen GmbH
Original Assignee
Aluminium Walzwerke Singen GmbH
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 Aluminium Walzwerke Singen GmbH filed Critical Aluminium Walzwerke Singen GmbH
Application granted granted Critical
Publication of US2912369A publication Critical patent/US2912369A/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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    • 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
    • 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
    • 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

Definitions

  • Such loose aluminum particles are easily discovered, for example by rubbing the etched foil with the naked hand or with a cloth.
  • the etched foil appreciably improved in its effect by removing mechanically the loose particles from the surface of the foil before forming it.
  • This removing can be carried out in different ways.
  • the foil is first rinsed in a water bath or by spraying and afterwards rubbed on both sides with wet wipers of foamed latex, whereby the loose particles are removed completely or at least nearly completely from the surface.
  • foamed latex has also a sucking effect which contributes to the thorough removing of the loose particles.
  • foamed latex of course other natural or synthetic products with a same effect may be used, or the sucking effect may be produced in another way.
  • Removing the loose particles is also possible by spraying water or blowing a gas against the surface of the foil with a high pressure. But the use of foamed latex wipers is more eflicacious.
  • the accompanying drawing shows schematically an 2,912,369 Patented Nov. 10, 1959 example of an arrangement for removing the loose particles from the surface of an etched aluminum foil.
  • the etched foil 1 passes first the tank 2, where it is drawn through the rinsing water 3 and sprayed with water or blown by gas under pressure from the nozzle 4.
  • the reference numeral 5 designates the rolls which guide the foil 1. After leaving the tank 2 the wet foil is rubbed with the rolls 6 and 7 of foamed latex. It is also possible to arrange two pairs of rolls from which the first pair chiefly loosens the particles and the second pair removes them from the surface of the foil.
  • the residual current had been measured at 450 volts in the finished capacitor.
  • a method of making aluminum electrodes for electrolytic capacitors comprising the steps of etching the surface of the aluminum electrode to multiply the effective surface area of the electrode, rinsing the etched surface with'a liquid to remove any soluble salts from the etched surface and oxidizing the etched surface of the electrode, the improvement comprising subjecting the etched surface of the aluminum electrode prior to the oxidizing step to the action of a soft, porous, rotating roll, which action subjects the etched surfaceto the suction of the roll, to remove any particles loosened during the etching step from the surface of the aluminum elec-. trode before the oxidizing step, which particles would normally not be dislodged by the rinsing action alone.
  • a method of making aluminum electrodes for electrolytic capacitors comprising the steps of etching the surface of an aluminum electrodev to multiply the effective surface area of the electrode and oxidizing the surface of the electrode after the etching step, the improvement comprising the steps of removing any particles loosened during the etching step from the surface of the aluminum electrode before the oxidizing step by subjecting the said surface to the action of a soft, porous foam latex rotatable roll, said roll having a hollow interior which communicates with a liquid under pressure and perforations from the hollow interior to the outer periphery of the roll through which the liquid flows, the action of the rotatable roll subjecting the etched surf-ace to the combined action of the suction of the roll and the rinsing liquid.

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  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Metallurgy (AREA)
  • Materials Engineering (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Organic Chemistry (AREA)
  • Power Engineering (AREA)
  • General Chemical & Material Sciences (AREA)
  • Mechanical Engineering (AREA)
  • Electrochemistry (AREA)
  • Microelectronics & Electronic Packaging (AREA)
  • Chemical Treatment Of Metals (AREA)
  • ing And Chemical Polishing (AREA)
  • Fixed Capacitors And Capacitor Manufacturing Machines (AREA)
US524784A 1954-07-28 1955-07-27 Fabrication of etched foils for electrolytic capacitors Expired - Lifetime US2912369A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DEA20846A DE1033781B (de) 1954-07-28 1954-07-28 Verfahren zur Herstellung von auf chemischem oder elektrochemischem Wege stark aufgerauhten Aluminiumflaechen fuer Elektrolytkondensatoren

Publications (1)

Publication Number Publication Date
US2912369A true US2912369A (en) 1959-11-10

Family

ID=6924782

Family Applications (1)

Application Number Title Priority Date Filing Date
US524784A Expired - Lifetime US2912369A (en) 1954-07-28 1955-07-27 Fabrication of etched foils for electrolytic capacitors

Country Status (6)

Country Link
US (1) US2912369A (de)
AT (1) AT196525B (de)
BE (1) BE540125A (de)
DE (1) DE1033781B (de)
DK (1) DK86151C (de)
FR (1) FR1128255A (de)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6231619B1 (en) * 1995-12-11 2001-05-15 Shipley Company, L.L.C. Electroplating process

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1155540B (de) * 1962-04-09 1963-10-10 Siemens Ag Verfahren zur Herstellung von Aluminiumelektroden fuer Elektrolytkondensatoren
FR2438163B1 (fr) * 1978-10-05 1985-09-27 Joud Fernand Robert Moteur a combustion interne performant
JPS6227192A (ja) * 1985-07-26 1987-02-05 Fuji Photo Film Co Ltd 平版印刷版用支持体の製造方法

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB467024A (en) * 1935-12-09 1937-06-09 Dubilier Condenser Co 1925 Ltd Improvements in or relating to electrolytic condensers and other electrolytic devices
US2549946A (en) * 1948-02-03 1951-04-24 Hudson Electrochemical Co Electropolishing
US2682502A (en) * 1950-07-19 1954-06-29 Kaiser Aluminium Chem Corp Method and material for electrolytically brightening aluminum surfaces
US2684922A (en) * 1950-05-06 1954-07-27 Reynolds Metals Co Method of making planographic printing sheets

Family Cites Families (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR781144A (fr) * 1933-11-11 1935-05-09 Magnavox Co Perfectionnements aux dispositifs électrolytiques, tels que condensateurs et analogues
DE754221C (de) * 1934-08-22 1953-01-19 Radio Patents Corp Verfahren zur Herstellung von Elektroden fuer elektrolytische Kondensatoren, die zwecks Oberflaechenvergroesserung geaetzt oder sonstwie chemisch behandelt sind
GB489884A (en) * 1936-08-06 1938-08-05 Mallory Patents Holding Compan Processes for etching electrode metal for electrolytic condensers and the like
GB508075A (en) * 1936-12-22 1939-06-22 Siemens Ag Improvements in or relating to processes for the purification of etched electrodes
CH209021A (de) * 1937-08-19 1940-03-15 Philips Nv Elektrolytischer Kondensator.
US2282723A (en) * 1939-11-22 1942-05-12 Alfred E Hamilton Method of finishing metal sheets
US2396685A (en) * 1940-11-07 1946-03-19 Aerovox Corp Art of aluminum etching

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB467024A (en) * 1935-12-09 1937-06-09 Dubilier Condenser Co 1925 Ltd Improvements in or relating to electrolytic condensers and other electrolytic devices
US2549946A (en) * 1948-02-03 1951-04-24 Hudson Electrochemical Co Electropolishing
US2684922A (en) * 1950-05-06 1954-07-27 Reynolds Metals Co Method of making planographic printing sheets
US2682502A (en) * 1950-07-19 1954-06-29 Kaiser Aluminium Chem Corp Method and material for electrolytically brightening aluminum surfaces

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6231619B1 (en) * 1995-12-11 2001-05-15 Shipley Company, L.L.C. Electroplating process

Also Published As

Publication number Publication date
AT196525B (de) 1958-03-25
FR1128255A (fr) 1957-01-03
DE1033781B (de) 1958-07-10
DK86151C (da) 1958-09-01
BE540125A (fr) 1959-07-17

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