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EP0015869A1 - Procédé et dispositif pour le traitement électrolytique en continu d'une bande métallique - Google Patents

Procédé et dispositif pour le traitement électrolytique en continu d'une bande métallique Download PDF

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Publication number
EP0015869A1
EP0015869A1 EP80810054A EP80810054A EP0015869A1 EP 0015869 A1 EP0015869 A1 EP 0015869A1 EP 80810054 A EP80810054 A EP 80810054A EP 80810054 A EP80810054 A EP 80810054A EP 0015869 A1 EP0015869 A1 EP 0015869A1
Authority
EP
European Patent Office
Prior art keywords
cells
metal strip
sub
electrolyte solution
electrodes
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.)
Withdrawn
Application number
EP80810054A
Other languages
German (de)
English (en)
Inventor
William H. Anthony
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
Schweizerische Aluminium AG
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 Alusuisse Holdings AG, Schweizerische Aluminium AG filed Critical Alusuisse Holdings AG
Publication of EP0015869A1 publication Critical patent/EP0015869A1/fr
Withdrawn legal-status Critical Current

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    • C—CHEMISTRY; METALLURGY
    • C25—ELECTROLYTIC OR ELECTROPHORETIC PROCESSES; APPARATUS THEREFOR
    • C25D—PROCESSES FOR THE ELECTROLYTIC OR ELECTROPHORETIC PRODUCTION OF COATINGS; ELECTROFORMING; APPARATUS THEREFOR
    • C25D7/00—Electroplating characterised by the article coated
    • C25D7/06—Wires; Strips; Foils
    • C25D7/0614—Strips or foils
    • C—CHEMISTRY; METALLURGY
    • C25—ELECTROLYTIC OR ELECTROPHORETIC PROCESSES; APPARATUS THEREFOR
    • C25F—PROCESSES FOR THE ELECTROLYTIC REMOVAL OF MATERIALS FROM OBJECTS; APPARATUS THEREFOR
    • C25F7/00—Constructional parts, or assemblies thereof, of cells for electrolytic removal of material from objects; Servicing or operating

Definitions

  • the invention relates to a method and a device for the continuous electrochemical treatment of a metal strip, in particular to the continuous electrochemical cleaning and anodizing of aluminum strips for lithographic purposes and for applications in the field of capacitor foils.
  • Aluminum and aluminum alloys have been treated electrochemically for years using various techniques. All of these techniques require electricity generation in a continuously running metal strip. In one of these applied techniques, the current is fed to the continuously running metal strip via a copper contact roller or rod before the metal strip is immersed in the treatment cell.
  • This technique has many disadvantages. For example, the aluminum strip must be dried to prevent electrolytic dissolution of the contact roller or rod, since otherwise the contact roller or rod is anodically dissolved, which leads to holes in its surface.
  • An additional problem arises from the arc discharges that occur when the two surfaces are separated. These arc discharges are caused by edge ridges or protruding ridges on the belt surface. Arc discharges lead to pitting in the aluminum as well as pitting and oxidation in the contact part.
  • a third and even more important problem in the continuous electrochemical cleaning and anodizing of metal strips using the contact roller technique is the overheating of the metal strips, the anodic layers and the electrolyte solution as a result of the current being transported through the metal strip when it is in air from the contact point to the treatment cell emotional.
  • the electrochemical cleaning or etching of tapes for lithographic purposes can be up to - 0.5 A / cm 2 alternating or direct current over a treatment period require from 30 to 60 s. With a production of 18 m / min and a treatment time of 30 s, a 9 m long treatment cell would be required. With a bandwidth of 1 m, a current of 45,000 A would have to be transported through the metal belt.
  • a calculation shows that the metal strip would heat up at the speeds listed in Table I if this current flows through the metal strip, which moves in air from the contact roller to the solution.
  • U.S. Patent No. 3,865,700 discloses a method and apparatus for continuously anodizing aluminum in which some of the above-mentioned disadvantages related to contact roller technology are eliminated.
  • the above-mentioned patent document discloses a system in which the aluminum strip is first continuously anodized in an anodizing cell and then enters a cathodic contact cell in which the current is supplied to the metal strip as it passes through this contact cell. The aluminum strip then enters another anodizing cell.
  • This device reduces the current flow in the second anodizing cell to that part of the metal strip which is first immersed in the anodizing solution, since the metal strip is due to the pre-entry anodization in the contact cell already has an anodic and consequently electrochemically resistant layer.
  • This device also avoids the introduction of the current into the metal strip via a copper contact roller, so that the above-mentioned arc discharges, which cause pitting both on the strip and on the contact roller, are eliminated. With this device, however, it is still necessary to transport the metal strip in air from the contact cell to the subsequent anodizing cell. As a result, the above-mentioned overheating of the metal strip, the anodic layers and the electrolyte solution occurs in the treatment cell.
  • GB-PS 1 411 919 discloses a method and an apparatus for the electrochemical treatment of capacitor foils or sheets for lithographic purposes.
  • the metal strip is guided around conveyor rollers in a single electrolyte cell, and the electrical current is supplied to the metal strip through the treatment solution via a series of electrodes.
  • the metal strip remains immersed in the electrolyte solution during the passage of current, thereby preventing the metal strip from overheating by avoiding air contact and cooling the electrolyte solution.
  • the British patent solves the problems of overheating the metal strip, it suffers from another disadvantage which does not occur with the more conventional types of current transfer from treatment cell to treatment cell as discussed above using the contact cell technique of U.S. Patent No. 3,865,700.
  • the problem created by the British patent is the loss of electrical energy. This loss of electrical energy occurs because a large part of the electrical energy supplied to the electrodes is not transferred to the metal strip, but flows off via electrolyte solution paths.
  • FIG. 1 shows a first exemplary embodiment of the present invention, in which a treatment cell 10 with side walls 12 and a base 14 is divided into a plurality of cells 16, 18, 20, 22, 24 and 26 by inert partition walls 28, 30, 32, 34 and 36 is.
  • Each of these cells 16, 18, 20, 22, 24 and 26 is equipped with an electrode 38, 40, 42, 44, 46 and 48, which are connected to a 3-phase AC source 50. It is on This point mentions that the required number of phases of the alternating current or the number of rectifiers depends directly on the number of sub-cells present in the treatment cell.
  • the treatment cells shown in Fig. 1-5 are divided into six sub-cells and therefore require at least a 3-phase alternating current or three rectifiers.
  • the treatment cell were divided into two sub-cells, at least one single-phase alternating current or a single rectifier would be required. As a result, at least one single-phase alternating current or a single rectifier would be required for every two sub-cells.
  • a multi-phase alternating current or meh could for two sub-cells - eral rectifiers are used.
  • the current-carrying and the grounded poles 52 and 54 of the first phase are connected to the electrodes -38 and 44, respectively.
  • the current-carrying and the grounded pole 56 and 58 of the second phase are connected to the electrodes 40 and 46, respectively.
  • the current-carrying and the grounded pole are 60 and 62 with the electric - the associated 42 and 48 respectively.
  • a plurality of conveyor rollers 64 are provided, one of which is assigned to each electrode and each partition.
  • the treatment cell 10 contains an electrolyte solution 72 suitable for anodizing or electrochemical cleaning or etching.
  • the liquid level of the solution is set in such a way that it is approximately tangential to the surfaces of the conveyor rollers assigned to the partition walls, ie that the conveyor rollers just barely cover with liquid.
  • the immersed ends 68 of the electrodes and the free ends 70 of the partitions are arcuate and have the same radius of curvature as the conveyor rollers. In this way, the metal belt 66 does not come into contact with air when it runs over the rollers.
  • the electrolytic conduction path is limited to the solution film, which overflows the metal when it runs over the conveyor rollers, and to the solution, which lies between the underside of the conveyor rollers and flows through the arcuate surfaces of the partitions.
  • the electrical resistance of the solution path between the various current-carrying and grounded electrodes is relatively high compared to the metal strip. It follows from this that the metal strip represents the main carrier of the electrical current between the corresponding current-carrying and grounded electrode pairs. In this way, a loss of electrical energy is prevented and the heating of the metal strip due to air contact is also suppressed.
  • the metal belt 66 is fed via the conveyor roller 74 to the treatment cell 10 and is led out of it via the earthed conveyor roller 76.
  • the conveyor rollers can be made of plastic-coated steel, ceramic or another inert, non-conductive material.
  • the electrodes are preferably made of graphite or titanium.
  • FIG. 2 shows a second exemplary embodiment of the present invention. It is similar to that in FIG. 1 and is used for the electrolytic treatment of both sides of the metal strip by means of a 3-phase alternating current source 150.
  • this treatment cell 110 the partition walls in FIG. 1 are replaced by electrodes 128, 130, 132, 134, 136 and 138 which feed the current to the opposite side of the metal strip.
  • the principle of the arcuate end faces of the electrodes, which allow the associated conveyor rollers to be approached, is also maintained here. In this way, the solution path for the current between corresponding current-carrying and grounded electrode pairs has a high electrical resistance, as was previously discussed with reference to FIG. 1.
  • FIG. 3 shows a third exemplary embodiment of the present invention.
  • the metal strip is continuously treated in a treatment cell which has the geometry disclosed in FIGS. 1 and 2, the electrodes 238, 240, 242, 244, 246 and 248 being supplied with direct current the.
  • the principle of the arcuate end faces of the electrodes, which allow the assigned conveyor rollers to be approached, is also maintained here, as was previously discussed with reference to FIGS. 1 and 2. In this way, the solution for the current between electrode pairs has a high electrical resistance.
  • the metal strip runs over conveyor rollers in the same way as described above.
  • the current is supplied to the metal strip by connecting the electrodes to three separate rectifiers 250, as shown in FIG. 3.
  • the electrodes 238 and 240 are connected to the positive and negative poles of a first rectifier.
  • electrodes 242 and 244 are connected to the positive and negative poles of a second rectifier.
  • electrodes 246 and 248 are connected to the positive and negative poles of a third rectifier, respectively. It follows from this arrangement that the metal strip appears as a cathode in the first, third and fifth sub-cells 216, 220 and 224, and as an anode in the second, fourth and sixth sub-cells 218, 222 and 226.
  • the metal strip is thus electrochemically cleaned in the first, third and fifth sub-cells, while the metal strip is anodized in the second, fourth and sixth sub-cells.
  • the anodizing voltage can be gradually increased in successive anodizing cells 218, 222 and 226.
  • the continuous strip anodizing of both sides of the metal strip is achieved by using three rectifiers 350.
  • the electrodes 328, 330, 332, 334, 336 and 378 which feed the current to the underside of the metal strip, form the partition walls between the sub-cells.
  • the electrodes are provided with an arcuate surface in order to form a restricted solution with the assigned conveyor rollers, which causes an increase in the electrical resistance between adjacent cells.
  • FIG. 5 shows a fifth exemplary embodiment of the present invention, in which a metal strip can be electrochemically cleaned on the one hand and anodized on the other hand.
  • cells 416, 420 and 424 function as cathodic cleaning cells and cells 418, 422 and 426 as anodizing cells.
  • the current is applied to the metal strip in the manner shown in FIG. 5 and in the same manner as previously discussed with reference to FIGS. 3 and 4 was fed through a set of three rectifiers.
  • the embodiment of the treatment cell shown in FIG. 5 is also based on the idea of the electrical resistance between adjacent cells due to the arcuate design of the electrode surfaces, which the resistance the solution path between neighboring cells increased to keep as large as possible.
  • the liquid level of the solution is set in all treatment cells shown in Figs. 1 to 5 such that it is approximately tangential to the surfaces of the conveyor rollers associated with the partition walls or the electrodes with the corresponding arcuate surfaces, i.e. that the conveyor rollers are just barely covered with liquid.
  • the metal strip does not come into contact with air when it runs over the rollers from one cell to an adjacent cell.
  • the electrolytic conduction path is limited to the solution film which rinses the metal strip when it runs over the conveyor rollers and to the solution which flows between the underside of the conveyor rollers and the arcuate surfaces of the partition walls or the electrodes. It follows that the metal strip is the main carrier of the electrical current between the electrodes and thus contributes to a reduction in the loss of electrical energy.
  • the present invention provides an improved method and a device for the continuous electrochemical treatment of a metal strip, in particular for the continuous electrochemical cleaning or etching and anodizing of aluminum strip for lithographic purposes and for applications in the field of capacitor foils.
  • the electrolyte cell is designed in such a way that overheating of the metal strip as a result of air contact cannot occur and at the same time the current paths surrounding the metal strip between the Electrodes decreased.
  • the present invention has considerable advantages over known techniques, namely the prevention of pitting on the aluminum surface, the suppression of the heat build-up in the aluminum strip and a lower loss of electrical energy.

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  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Electrochemistry (AREA)
  • Materials Engineering (AREA)
  • Metallurgy (AREA)
  • Organic Chemistry (AREA)
  • Electroplating Methods And Accessories (AREA)
  • Fixed Capacitors And Capacitor Manufacturing Machines (AREA)
EP80810054A 1979-03-01 1980-02-13 Procédé et dispositif pour le traitement électrolytique en continu d'une bande métallique Withdrawn EP0015869A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
US16120 1979-03-01
US06/016,120 US4214961A (en) 1979-03-01 1979-03-01 Method and apparatus for continuous electrochemical treatment of a metal web

Publications (1)

Publication Number Publication Date
EP0015869A1 true EP0015869A1 (fr) 1980-09-17

Family

ID=21775510

Family Applications (1)

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EP80810054A Withdrawn EP0015869A1 (fr) 1979-03-01 1980-02-13 Procédé et dispositif pour le traitement électrolytique en continu d'une bande métallique

Country Status (4)

Country Link
US (1) US4214961A (fr)
EP (1) EP0015869A1 (fr)
DE (1) DE2917383A1 (fr)
DK (1) DK82580A (fr)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0082452A1 (fr) * 1981-12-21 1983-06-29 American Hoechst Corporation Procédé de grenage électrochimique d'aluminium avec un courant alternatif triphasé et son utilisation dans la fabrication des plaques à imprimer
EP0209168A1 (fr) * 1985-07-12 1987-01-21 N.V. Bekaert S.A. Procédé et dispositif pour le nettoyage par décapage électrochimique en utilisant un courant alternatif d'une fréquence spécifiée

Families Citing this family (16)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4315806A (en) * 1980-09-19 1982-02-16 Sprague Electric Company Intermittent AC etching of aluminum foil
FR2542766B1 (fr) * 1983-03-16 1987-07-03 Cegedur Procede et dispositif de traitement electrochimique de la surface de produits metalliques de forme allongee
JPS59215500A (ja) * 1983-05-19 1984-12-05 Fuji Photo Film Co Ltd 電解処理方法
DE3378270D1 (en) * 1983-06-13 1988-11-24 Hoechst Ag Method and plants for the continuous unilateral anodic oxidation of aluminium bands and utilization thereof to make offset printing plates
US4624751A (en) * 1983-06-24 1986-11-25 American Cyanamid Company Process for fiber plating and apparatus with special tensioning mechanism
CH655135A5 (de) * 1983-07-14 1986-03-27 Alusuisse Vorbehandlung eines bandes oder einer folie aus aluminium durch elektrochemische oxidation.
JPS6056099A (ja) * 1983-09-05 1985-04-01 Fuji Photo Film Co Ltd 電解処理装置
JPS6067699A (ja) * 1983-09-21 1985-04-18 Fuji Photo Film Co Ltd 電解処理方法
US4820390A (en) * 1987-07-06 1989-04-11 The Interlake Companies, Inc. Apparatus and method for continuous electrochemical machining of strip material
JPH07423B2 (ja) * 1987-11-27 1995-01-11 富士写真フイルム株式会社 印刷版用アルミニウム支持体の製造方法
DE3934683A1 (de) * 1989-10-18 1991-04-25 Kurt Hausmann Verfahren und vorrichtung zur elektrochemischen aufrauhung einer metalloberflaeche
US5181997A (en) * 1990-06-19 1993-01-26 Fuji Photo Film Co., Ltd. Apparatus and method for continuously electrolyzing aluminum products
IT1317896B1 (it) * 2000-08-10 2003-07-15 Ct Sviluppo Materiali Spa Metodo di decapaggio elettrolitico continuo di prodotti metallici concelle alimentate a corrente alternata.
US20050123681A1 (en) * 2003-12-08 2005-06-09 Jar-Wha Lee Method and apparatus for the treatment of individual filaments of a multifilament yarn
US8137752B2 (en) * 2003-12-08 2012-03-20 Syscom Advanced Materials, Inc. Method and apparatus for the treatment of individual filaments of a multifilament yarn
US9324472B2 (en) 2010-12-29 2016-04-26 Syscom Advanced Materials, Inc. Metal and metallized fiber hybrid wire

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3507767A (en) * 1966-06-23 1970-04-21 United States Steel Corp Apparatus for electrolytically cleaning strands
DE2234365A1 (de) * 1972-07-13 1974-01-24 Kalle Ag Vorrichtung zur kontunierlichen elektrochemischen behandlung eines metallbands
FR2192873A1 (fr) * 1972-07-13 1974-02-15 Kalle Ag
US4119515A (en) * 1977-03-28 1978-10-10 National Steel Corporation Apparatus for electroplating sheet metals

Family Cites Families (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR985497A (fr) * 1943-11-09 1951-07-19 Alais & Froges & Camarque Cie Procédé pour l'oxydation électrolytique continue de fils, bandes et pièces analogues métalliques
US2494954A (en) * 1946-02-02 1950-01-17 Reynolds Metals Co Apparatus for continuous anodizing of sheet metal
BE635457A (fr) * 1962-08-16
US3630864A (en) * 1967-06-19 1971-12-28 Tokyo Shibaura Electric Co Method and apparatus for continuous electrolytic polishing of fine metal wires
JPS5334107B2 (fr) * 1974-04-23 1978-09-19
AR204283A1 (es) * 1975-01-21 1975-12-10 Uss Eng & Consult Aparato para el tratamiento electrolitico de tiras de metal

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3507767A (en) * 1966-06-23 1970-04-21 United States Steel Corp Apparatus for electrolytically cleaning strands
DE2234365A1 (de) * 1972-07-13 1974-01-24 Kalle Ag Vorrichtung zur kontunierlichen elektrochemischen behandlung eines metallbands
FR2192873A1 (fr) * 1972-07-13 1974-02-15 Kalle Ag
US4119515A (en) * 1977-03-28 1978-10-10 National Steel Corporation Apparatus for electroplating sheet metals

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0082452A1 (fr) * 1981-12-21 1983-06-29 American Hoechst Corporation Procédé de grenage électrochimique d'aluminium avec un courant alternatif triphasé et son utilisation dans la fabrication des plaques à imprimer
EP0209168A1 (fr) * 1985-07-12 1987-01-21 N.V. Bekaert S.A. Procédé et dispositif pour le nettoyage par décapage électrochimique en utilisant un courant alternatif d'une fréquence spécifiée

Also Published As

Publication number Publication date
DE2917383A1 (de) 1980-09-04
US4214961A (en) 1980-07-29
DK82580A (da) 1980-09-02

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Inventor name: ANTHONY, WILLIAM H.