US3271287A - Apparatus for annealing and electrolytically treating metallic strip - Google Patents

Apparatus for annealing and electrolytically treating metallic strip Download PDF

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Publication number
US3271287A
US3271287A US240372A US24037262A US3271287A US 3271287 A US3271287 A US 3271287A US 240372 A US240372 A US 240372A US 24037262 A US24037262 A US 24037262A US 3271287 A US3271287 A US 3271287A
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US
United States
Prior art keywords
annealing
metal
electrolytic
electrolyte
tank
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
US240372A
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English (en)
Inventor
Post Wolfgang
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.)
Rio Tinto Switzerland AG
Original Assignee
Alusuisse Holdings AG
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Filing date
Publication date
Application filed by Alusuisse Holdings AG filed Critical Alusuisse Holdings AG
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    • 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
    • H01G9/0029—Processes of manufacture
    • H01G9/0032—Processes of manufacture formation of the dielectric layer
    • C—CHEMISTRY; METALLURGY
    • C21—METALLURGY OF IRON
    • C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
    • C21D9/00—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor
    • C21D9/52—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor for wires; for strips ; for rods of unlimited length
    • C21D9/54—Furnaces for treating strips or wire
    • C21D9/56—Continuous furnaces for strip or wire
    • C21D9/62—Continuous furnaces for strip or wire with direct resistance heating
    • 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
    • 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

  • the invention relates to process and an apparatus for annealing and electrolytic treatment of continuous lengths of metal, such as strips or wires, and especially to annealing and electrolytic etching of aluminium foil for electrolytic capacitors.
  • the electrode foil In the production of electrolytic capacitors the electrode foil is usually etched in order to increase its surface area. Before etching the foil is annealed, on the one hand to soften the foil after rolling, and on the other hand to volatilise lubricants and hence degrease the foil. This annealing is commonly efi'ected in a separate operation in annealing furnaces of various kinds.
  • annealing is effected by electrical resistance heating apart of the travelling length of metal, and electroyltic treatment is combined with it in one apparatus and in one working operation, by using sufiicient of the current flowing through the electrolytic treatment bath for annealing.
  • the whole or part of the current flowing through the electrolytic treatment bath can be used according to the extent of annealing desired.
  • the process is particularly suitable for the combined annealing and electrolytic etching of a continuous length of aluminium foil, which is passed through an electrolytic etching bath and is subjected before entering this bath to sufficient of the current flowing through the bath to anneal it.
  • a suitable apparatus for carrying out this process comprises an electrolytic treatment tank, means for passing a continuous length of metal through it, spaced electrical contact points for the metal defining between them an annealing zone, and a variable resistance connecting the points.
  • the annealing zone and the variable resistance are connected together in parallel in series with the electrolytic treatment bath, and in operation the proportion of current which flows through the annealing zone is controlled by the variable resistance.
  • the accompanying drawing shows schematically the preferred apparatus for annealing and electrolytic etching aluminium foil by the process according to the invention.
  • An aluminium foil 1 is unrolled from a supply roll 2, and is passed over contact rollers 3 and 4, which act as electrical contact points and define between them an annealing zone 5, and then into an etching bath 6.
  • the contact rollers may be made from copper or brass.
  • An electrode 7 dips into the etching bath. Current flows from a current source 8 via the electrode 7 through the bath 6 to the metal foil 1 and back to the current source 8 via the Patented Sept. 6, 1966 contact rollers 3 and 4. The whole of the current supplied by the current source 8 is used for the etching.
  • the foil only a part of the current flowing through the foil in the etching bath may be necessary. The higher the annealing temperature, the greater must be the current flowing through the annealing zone 5.
  • the contact rollers 3 and 4 are connected through a variable re sistance 9 in parallel with the annealing zone 5. The remaining current flows through the variable resistance 9. If the whole of the current used for etching is also necessary for annealing, the resistance 9 may be disconnected, and then the contact roller 4 serves only as a guide roller.
  • the annealing current can be adjusted as desired without it being necessary to alter the etching current. It is of course always necessary that the current fed to the electrolytic treatment bath should be greater than or equal to the current necessary for annealing.
  • the annealing zone 5 can be exposed to the atmosphere or can be surrounded by a screening tunnel through which an inert gas is passed. Further treatment baths can be installed after the etching bath '6.
  • metal strips or wires can be annealed and subjected to an electrolytic treatment such as etching or pickling.
  • a 50 mm. wide and 0.09 mm. thick aluminium foil having a purity of 99.99% was annealed by feeding it with a speed of 50 cm./min. through the apparatus illustrated in the accompanying drawing and was etched in an aqueous solution of 10% sodium chloride and 3% bydrochloric acid at -80 C.
  • the total current flowing through the apparatus and used for the etching amounted to 220 amps.
  • the resistance 9 was so adjusted that a partial current of amps flowed through the annealing zone 5.
  • the latter was 700 mm. long. In this way the aluminium foil was heated to a temperature of 350 C. By increasing the annealing current to 200 amps the temperature in the annealing zone rose to 450 C.
  • An apparatus for treating metal comprising an electrolytic treatment tank for containing an electrolyte for the electrolytic treatment of the metal, means for continuously advancing a continuous length of metal lengthwise through the electrolyte in said tank, two electrical contact points at the entrance side of said electrolytic tank in electrical contact with said metal and spaced therealong to define an annealing zone therebetween, and an incomplete electric circuit comprising a source of electric current having two terminals of opposite polarity, an electrode dipping into said electrolyte, an electrical connection between one of said terminals and said electrode, an electrical connection between the other terminal and the contact point furthest from the entrance side of the tank, and a variable resistance between said contact points in parallel with the section of the metal between said contact points while said metal is extending between said contact points, said circuit being completed by the continuous length of metal passing over the two electrical contact points and through the electrolyte.
  • one of the contact points is an electrically conductive roller adapted to be arranged at the surface of the liquid in the which an inert gas may be passed.

Landscapes

  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Power Engineering (AREA)
  • Metallurgy (AREA)
  • Microelectronics & Electronic Packaging (AREA)
  • Organic Chemistry (AREA)
  • Materials Engineering (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Electrochemistry (AREA)
  • Physics & Mathematics (AREA)
  • Thermal Sciences (AREA)
  • Crystallography & Structural Chemistry (AREA)
  • Mechanical Engineering (AREA)
  • Manufacturing & Machinery (AREA)
  • Cleaning And De-Greasing Of Metallic Materials By Chemical Methods (AREA)
  • Electroplating Methods And Accessories (AREA)
US240372A 1961-11-28 1962-11-27 Apparatus for annealing and electrolytically treating metallic strip Expired - Lifetime US3271287A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CH1382761A CH407697A (de) 1961-11-28 1961-11-28 Verfahren und Einrichtung zur kontinuierlichen Glühung und elektrolytischen Behandlung von Metallen in Form von Bändern oder Drähten

Publications (1)

Publication Number Publication Date
US3271287A true US3271287A (en) 1966-09-06

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ID=4395663

Family Applications (1)

Application Number Title Priority Date Filing Date
US240372A Expired - Lifetime US3271287A (en) 1961-11-28 1962-11-27 Apparatus for annealing and electrolytically treating metallic strip

Country Status (4)

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US (1) US3271287A (enExample)
CH (1) CH407697A (enExample)
GB (1) GB947852A (enExample)
NL (1) NL286037A (enExample)

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3714016A (en) * 1969-02-05 1973-01-30 Kolene Corp Aluminum shield for a roll in continuous strip apparatus
US4276347A (en) * 1976-12-25 1981-06-30 Mitsui Petrochemical Industries, Ltd. Reinforced resinous laminate
US4551210A (en) * 1984-11-13 1985-11-05 Olin Corporation Dendritic treatment of metallic surfaces for improving adhesive bonding
CN109487050A (zh) * 2019-01-15 2019-03-19 浙江金冠特种变压器有限公司 一种用于生产电源线的铜线退火装置

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1285887A (en) * 1918-06-06 1918-11-26 Herbert Alexander Annealing metal wire by electricity.
US1804486A (en) * 1928-08-18 1931-05-12 Wright Parvin Apparatus for treating wires
US2463412A (en) * 1942-07-25 1949-03-01 John S Nachtman Electric resistance heat-treating of electroplated coatings
US2755238A (en) * 1955-03-25 1956-07-17 Sprague Electric Co Electrolytic etching and oxidizing of aluminum
US3123543A (en) * 1961-11-24 1964-03-03 Method and apparatus for feeding articles

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1285887A (en) * 1918-06-06 1918-11-26 Herbert Alexander Annealing metal wire by electricity.
US1804486A (en) * 1928-08-18 1931-05-12 Wright Parvin Apparatus for treating wires
US2463412A (en) * 1942-07-25 1949-03-01 John S Nachtman Electric resistance heat-treating of electroplated coatings
US2755238A (en) * 1955-03-25 1956-07-17 Sprague Electric Co Electrolytic etching and oxidizing of aluminum
US3123543A (en) * 1961-11-24 1964-03-03 Method and apparatus for feeding articles

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3714016A (en) * 1969-02-05 1973-01-30 Kolene Corp Aluminum shield for a roll in continuous strip apparatus
US4276347A (en) * 1976-12-25 1981-06-30 Mitsui Petrochemical Industries, Ltd. Reinforced resinous laminate
US4551210A (en) * 1984-11-13 1985-11-05 Olin Corporation Dendritic treatment of metallic surfaces for improving adhesive bonding
CN109487050A (zh) * 2019-01-15 2019-03-19 浙江金冠特种变压器有限公司 一种用于生产电源线的铜线退火装置

Also Published As

Publication number Publication date
GB947852A (en) 1964-01-29
CH407697A (de) 1966-02-15
NL286037A (enExample)

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