EP0430917B1 - Vorrichtung zur elektrolytischen Abscheidung einer kontinuierlichen Schicht mit konstanter Schichtdicke - Google Patents

Vorrichtung zur elektrolytischen Abscheidung einer kontinuierlichen Schicht mit konstanter Schichtdicke Download PDF

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Publication number
EP0430917B1
EP0430917B1 EP90870223A EP90870223A EP0430917B1 EP 0430917 B1 EP0430917 B1 EP 0430917B1 EP 90870223 A EP90870223 A EP 90870223A EP 90870223 A EP90870223 A EP 90870223A EP 0430917 B1 EP0430917 B1 EP 0430917B1
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EP
European Patent Office
Prior art keywords
cathode
anode
modules
anodic
module
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
EP90870223A
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English (en)
French (fr)
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EP0430917A1 (de
Inventor
Jean Crahay
Roger Franssen
Marios Economopoulos
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.)
Centre de Recherches Metallurgiques CRM ASBL
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Centre de Recherches Metallurgiques CRM ASBL
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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
    • C25D7/0642—Anodes
    • 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
    • C25D7/0607—Wires

Definitions

  • the present invention relates to a device for forming a continuous electrolytic deposit of constant thickness on a mobile substrate, such as a moving metal strip. It more particularly aims at achieving a small and regular distance between the anode and the cathode, so as to allow the use of high current densities while limiting the ohmic losses in the electrolyte.
  • the device of the invention applies both to the deposition of a permanent protective coating on a metal strip and to the manufacture of a thin sheet, then separated from the substrate on which it has been formed.
  • a permanent protective coating on a metal strip
  • a thin sheet then separated from the substrate on which it has been formed.
  • an electrolytic deposition device comprising a circular cathode and an anode constituted by a plurality of anode modules.
  • the cathode formed by the substrate passes in front of these anodes with a spacing which can vary as a function of deformations, mechanical or thermal, of the substrate itself or of its support and guide rollers.
  • the geometric shape of the substrate and / or of its support and guide rollers may also have imperfections which have an adverse effect on the regularity of the electrolysis interval.
  • this electrolysis interval is as regular as possible, that is to say that its variations are kept within as narrow limits as possible. Indeed, these variations acquire a relative importance all the greater as the electrolysis interval is narrower, and this results in corresponding variations in the resistance of the electrical circuit, the current density and finally the efficiency. of the electrolytic deposition process.
  • the object of the present invention is to propose a device making it possible to remedy this drawback by ensuring the regularity of the electrolysis interval by simple means, even in the event of deformation of the substrate and / or of its support and guide rollers. .
  • a device for forming a continuous electrolytic deposit of constant thickness on a mobile substrate in which a cathode, constituted by said mobile substrate, passes in front of an anode with which it delimits an electrolysis interval of low height , said anode consisting of a plurality of anode modules and having orifices which open into said electrolysis interval, is characterized in that said anode modules are mechanically independent of each other, in that the electric circuits , respectively hydraulic supplying said anode modules have flexible sections between the fixed current sources, respectively electrolyte, and said anode modules, in that said anode modules are provided with means by which they bear on the cathode or on a surface directly connected to the cathode.
  • said support means of at least one anode module comprise means for adjusting the distance between said anode module and the cathode or the surface directly linked to the cahtode.
  • a surface directly linked to the cathode is a bearing surface which is at a known distance, preferably constant, from the cathode.
  • these are, for example, the surface of the drum of a radial electrolysis cell, against which the substrate is applied during its passage through the electrolytic solution; in this case, the distance between the cathode and the surface directly linked to the cathode is equal to the thickness of the product to be coated at any point in the electrolysis interval.
  • this surface directly linked to the cathode can be materialized in particular by cathode support rollers along its rectilinear trajectory.
  • the support members are for example constituted by pads with a low coefficient of friction, or by rollers, which slide, respectively which roll on the cathode or on the surface directly linked to the cathode.
  • the device of the invention comprises an electrolysis cell delimited by an enclosure surrounding at least one anode module
  • said adjustable support means are, at least in part, located inside the electrolysis cell.
  • at least said part is made of a material resistant to the electrolyte.
  • said electrolyte resistant material is preferably electrically insulating, or the members which it constitutes are electrically isolated from the anode and / or the cathode, in order to avoid an anodic attack on these members or on the contrary. a cathodic deposit on these same organs.
  • said adjustable support means are located outside the electrolysis cell.
  • said support means comprise hollow arms, which provide both mechanical support and hydraulic supply anode modules.
  • the anode modules are preferably provided with an individual hydraulic supply, for example from a large section manifold located outside the electrolysis cell.
  • Fig. 1 illustrates the principle of the device of the invention in the case of a radial electrolysis cell of the conventional type.
  • the electrolysis cell comprises a cathode, constituted by a roller 1 for deflecting the substrate 2, and an anode arranged opposite at least part of the periphery of the roller 1, at a predetermined distance from that -this.
  • the anode consists of a plurality of anode modules 3, mechanically independent of one another, which are each provided with support means 4 on the cathode roller 1 or on the substrate 2.
  • the arrow a indicates the direction of rotation of the roller 1; the arrows b symbolize the mechanical independence of the anode modules 3.
  • the roller cathode 1 and the anode namely here the anode modules 3, are generally immersed in the electrolyte bath.
  • the anode modules 3 can be constituted by particular anodes of the type described in the aforementioned patents BE-A-905,588 and BE-A-08,700,561.
  • FIG. 2 shows an example of mounting an anode module 3 provided with support means situated inside the electrolysis cell, seen in direction A of FIG. 1.
  • the anode modules 3 and their support means 4 are immersed in the electrolyte, symbolized by the hatched area 5.
  • the metal parts of the cathode and anode modules are of preferably made of titanium or an alloy such as hastelloy or of stainless steel; the support means comprise for example pads 4 in P T F E, which have a low coefficient of friction, while also being insensitive to the electrolyte.
  • the pads 4 are here arranged on either side of the deposition zone 6 corresponding to the substrate 2.
  • the pads 4 can be provided with adjustment means, known per se and not shown here, to vary the distance between the substrate 2 and the anode module 3 and / or to correct the variations in this distance due for example to the wear of the pads 4.
  • these adjustment means can be constituted by vertical threaded rods provided with nuts for adjusting the position of the anode module.
  • Figs. 3 to 5 illustrate various examples of mounting an anode module 3, the support means 4 of which are located outside the electrolysis cell.
  • the anode module 3 is surrounded by an enclosure 7 which contains the electrolyte 5; this enclosure 7 extends axially over a width at least equal to the width of the deposition zone 6 or of the substrate 2, and on the periphery over at least part of the periphery of the roller 1, to which it is connected by seals rotary seals 8.
  • seals 8 thus ensure sealing between the active part and the parts for supporting the cathode roller 1.
  • the substrate 2 and the deposition zone 6 are similar to those of FIG. 1.
  • the entire anode module 3 is seen in the direction A of FIG. 1.
  • the circulation of the electrolyte is ensured by means known per se, in particular by the two aforementioned Belgian patents, which are not part of the present invention and which are therefore not shown.
  • the anode module 3 is provided with two bent arms 9, 10 which pass respectively through the side walls of the enclosure 7 and bear, by their outer end, on the surface of the roller 1.
  • These arms 9, 10 are provided, at their outer end, support means constituted for example by rollers 4, which roll on the roller 1.
  • rollers are preferably made of a wear-resistant material, such as a ceramic material or a synthetic material such as PTFE, polyethylene (PE) or polypropylene (PP).
  • PTFE polyethylene
  • PP polypropylene
  • the tightness of the bushings 11, 12 of the walls of the enclosure 7 by the arms 9, 10 is ensured by any means known per se, for example by flexible membranes or bellows made of a material resistant to the electrolyte such as rubber. , PTFE, PE or P P.
  • FIG. 4 is substantially identical to that of FIG. 3.
  • the essential difference is that the rotary seals 8 are transferred to the bottom of grooves made in the roller 1. This results in a reduction in the peripheral length of the seals 8, which reduces the risk of electrolyte leakage. ; in addition, the bearing areas of the roller 1 are thus clearly separated from the active area exposed to the electrolyte 5.
  • FIG. 5 Another possible arrangement is illustrated in FIG. 5.
  • the two arms 9 and 10 are joined together in a stirrup spanning the enclosure 7 and resting on the roller 1 by support means such as rollers 4.
  • This stirrup 9, 10 is provided with a central branch 13 which enters the enclosure 7 through a passage 14 pierced in the rear wall of the enclosure 7, and which carries the anode module 3.
  • the sealing of the crossing 14 is also ensured by known means per se such as a flexible membrane or a bellows made of a material resistant to the electrolyte 5.
  • Fig. 6 illustrates a particular arrangement making it possible to supply each anode module with electrolyte individually, the support means of which are located outside the electrolysis cell.
  • the arm 10 consists of a tube which is connected to a supply manifold 16 by means of a flexible element such as a bellows 15.
  • the enclosure 7 acts as an outlet manifold , from which the electrolyte 5 is withdrawn by known means, not shown, and optionally returned to the supply collector after an appropriate treatment.
  • the other numerical marks correspond to the identical marks of FIGS. 3 to 5.
  • This arrangement simplifies the mounting of the anode modules, eliminating at least part of the conventional external hydraulic circuits.

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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)
  • Electrolytic Production Of Non-Metals, Compounds, Apparatuses Therefor (AREA)
  • Electrolytic Production Of Metals (AREA)

Claims (8)

  1. Vorrichtung zum Bilden einer kontinuierlichen elektrolytischen Abscheidung von konstanter Dicke auf einer beweglichen Unterlage, Vorrichtung bei welcher eine durch die besagte bewegliche Unterlage gebildete Kathode sich an einer Anode vorbeibewegt mit welch letzterer sie einen Elektrolysezwischenraum einer geringen Höhe begrenzt, wobei die besagte Anode von einer Vielzahl von anodischen Modulen gebildet wird und in dem besagten Elektrolysezwischenraum endende Öffnungen aufweist, dadurch gekennzeichnet, daß die besagten anodischen Module (3) voneinander mechanisch unabhängig sind, daß die elektrischen Leitungen, beziehungsweise die Hydraulikkreise, welche die besagten anodischen Module (3) speisen, flexible Abschnitte (15) zwischen den festen Zufuhrquellen für Strom, beziehungsweise für den Elektrolyten, und den besagten anodischen Modulen aufweisen, und daß die besagten anodischen Module mit Mitteln (4, 9, 10) ausgerüstet sind über welche sie sich auf der Kathode (2) oder auf einer direkt mit der Kathode verbundenen Oberfläche (1) abstützen.
  2. Vorrichtung gemäß dem Anspruch 1, dadurch gekennzeichnet, daß die besagten Abstützmittel (4) von wenigstens einem anodischen Modul (3) solche Mittel aufweisen die zum Regeln der Distanz zwischen dem besagten anodischen Modul (3) und der Kathode (2) oder der direkt mit der Kathode verbundenen Oberfläche (1) dienen.
  3. Vorrichtung gemäß dem einen oder dem anderen der Ansprüche 1 und 2, dadurch gekennzeichnet, daß sie eine Elektrolysezelle aufweist, welche durch eine Einfassung (7) abgegrenzt ist die zumindest ein anodisches Modul (3) umgibt.
  4. Vorrichtung gemäß dem Anspruch 3, dadurch gekennzeichnet, daß die besagten Abstützmittel (4) für die anodischen Module (3) innerhalb der Elektrolysezelle angeordnet sind.
  5. Vorrichtung gemäß dem Anspruch 4, dadurch gekennzeichnet, daß die besagten Abstützmittel für die anodischen Module (3) Kufen aufweisen, welche aus einem einen geringen Reibbeiwert aufweisenden Material bestehen.
  6. Vorrichtung gemäß dem Anspruch 3, dadurch gekennzeichnet, daß die besagten Abstützmittel (4) für die anodischen Module (3) außerhalb der Elektrolysezelle angeordnet sind.
  7. Vorrichtung gemäß dem Anspruch 6, dadurch gekennzeichnet, daß die besagten Abstützmittel Arme (9, 10; 13) aufweisen, welche die Wände der besagten Einfassung (7) durchqueren und sich auf der Kathode (2) oder auf einer direkt mit der Kathode verbundenen Oberfläche (1) abstützen.
  8. Vorrichtung gemäß dem Anspruch 7, dadurch gekennzeichnet, daß wenigstens einer der Arme (9, 10) aus einem Rohr besteht und für die Zufuhr des Elektrolyten zum entsprechenden anodischen Modul (3), beziehungsweise für die Ableitung des Elektrolyten aus dem entsprechenden anodischen Modul (3), benutzt wird.
EP90870223A 1989-11-27 1990-11-21 Vorrichtung zur elektrolytischen Abscheidung einer kontinuierlichen Schicht mit konstanter Schichtdicke Expired - Lifetime EP0430917B1 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
BE8901269A BE1003438A6 (fr) 1989-11-27 1989-11-27 Dispositif pour former un depot electrolytique continu d'epaisseur constante.
BE8901269 1989-11-27

Publications (2)

Publication Number Publication Date
EP0430917A1 EP0430917A1 (de) 1991-06-05
EP0430917B1 true EP0430917B1 (de) 1995-08-16

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EP90870223A Expired - Lifetime EP0430917B1 (de) 1989-11-27 1990-11-21 Vorrichtung zur elektrolytischen Abscheidung einer kontinuierlichen Schicht mit konstanter Schichtdicke

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US (1) US5124015A (de)
EP (1) EP0430917B1 (de)
JP (1) JPH03180485A (de)
AT (1) ATE126554T1 (de)
BE (1) BE1003438A6 (de)
DE (1) DE69021697D1 (de)

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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR100429154B1 (ko) * 2001-06-15 2004-04-28 주식회사 포스코 아노드 브릿지와 단위별 아노드 갭조정장치

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2271735A (en) * 1938-07-16 1942-02-03 Hanson Van Winkle Munning Co Machine for electroprocessing metal strip
FR2262369A1 (en) * 1974-02-25 1975-09-19 Mishima Kosan Co Ltd Magnetic tape prodn by electrolytic deposn - on a carrier passing through several independent cells
FR2271306A1 (en) * 1974-05-13 1975-12-12 Moshima Kosan Co Ltd Mfg. thin metal films by electrodeposition - such as a nickel-iron-molybdenum alloy with anisotropic magnetic properties
JPS63140100A (ja) * 1986-12-02 1988-06-11 Kawasaki Steel Corp 電解処理槽

Also Published As

Publication number Publication date
JPH03180485A (ja) 1991-08-06
US5124015A (en) 1992-06-23
DE69021697D1 (de) 1995-09-21
BE1003438A6 (fr) 1992-03-24
EP0430917A1 (de) 1991-06-05
ATE126554T1 (de) 1995-09-15

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