EP0425354B1 - Verfahren und Vorrichtung zur Elektroplattierung eines metallischen Bandes - Google Patents

Verfahren und Vorrichtung zur Elektroplattierung eines metallischen Bandes Download PDF

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Publication number
EP0425354B1
EP0425354B1 EP90402956A EP90402956A EP0425354B1 EP 0425354 B1 EP0425354 B1 EP 0425354B1 EP 90402956 A EP90402956 A EP 90402956A EP 90402956 A EP90402956 A EP 90402956A EP 0425354 B1 EP0425354 B1 EP 0425354B1
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EP
European Patent Office
Prior art keywords
strip
drum
rollers
roller
installation
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
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EP90402956A
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English (en)
French (fr)
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EP0425354A1 (de
Inventor
Gérard Colin
Jacques Keller
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.)
Sollac SA
Original Assignee
Sollac SA
Lorraine de Laminage Continu SA SOLLAC
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Application filed by Sollac SA, Lorraine de Laminage Continu SA SOLLAC filed Critical Sollac SA
Priority to AT90402956T priority Critical patent/ATE99741T1/de
Publication of EP0425354A1 publication Critical patent/EP0425354A1/de
Application granted granted Critical
Publication of EP0425354B1 publication Critical patent/EP0425354B1/de
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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
    • C25D17/00—Constructional parts, or assemblies thereof, of cells for electrolytic coating
    • 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
    • C25D7/0635—In radial cells
    • 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

Definitions

  • the invention relates to an installation for electroplating a metal strip and in particular an installation for electrogalvanizing a steel strip.
  • the invention also relates to a coating process implemented in this installation, in particular for electro-galvanizing a steel strip.
  • Methods and devices are known for producing the electrolytic coating of a steel strip continuously, this strip being circulated so as to pass through one or preferably several successive electrolytic cells in which the coating metal is deposited on the two sides of the strip simultaneously or on only one of the two sides.
  • the installations and processes used in the future should make it possible to produce sheets comprising a single-sided coating or a double-sided coating of very high quality constituted either by pure zinc or by a zinc alloy containing nickel or iron.
  • These sheets must have very good dimensional tolerances, edges of very good quality and the coating must have a perfectly defined and perfectly regular thickness in all parts of the sheet produced.
  • this coating must not have any longitudinal marks liable to affect the appearance and quality of the product.
  • the known methods and devices which are extremely varied use fixed electrodes brought to an anode potential with respect to the strip which constitutes a mobile cathode circulating, over a part of its path, in the vicinity of the active surface of the anodes.
  • the anodes and the strip to be coated are therefore electrically connected to the corresponding terminals of a source of direct electric current capable of passing a very high intensity electrolysis current through a layer of electrolytic liquid interposed between the anodes and the surface of the strip to be coated, this liquid being generally circulated, so as to improve its contact with the active surfaces and to ensure its renewal.
  • the electrolytic liquid is contained in a tank inside which the strip is brought to circulate near the active surfaces of the anodes which are completely immersed in the electrolytic liquid.
  • the different known methods and devices differ from each other mainly by the shape and position of the anodes, by the means for guiding the strip inside the tank filled with electrolytic liquid, by the means for supplying the cathode current strip, by the use of soluble anodes or, on the contrary, insoluble anodes and by the nature of the electrolyte used.
  • the coating metal is transported in the electrolyte by the electrolysis current between the anode and the strip brought to a cathodic potential whereas in the case of insoluble anodes, the coating metal comes from the electrolytic bath itself which must be regenerated continuously.
  • Certain coating installations comprise anodes having flat active surfaces between which the sheet to be coated passes. These anodes can be arranged either vertically or horizontally and the corresponding electrolysis cells are designated as vertical cells or horizontal cells.
  • the coating is carried out on both sides of the strip simultaneously.
  • the electrolysis cells designated as radial cells each consist of a tank containing an electrolytic liquid in which the anodes are immersed, delimiting an active internal surface in the form of a portion of cylinder opposite which one face of the strip to be coated, the width of the interval between the internal face of the anodes and the surface to be coated being substantially constant.
  • a drum mounted to rotate about a horizontal axis and substantially coaxial with the interior surface of the anodes is arranged inside the tank, so as to be partially immersed in the electrolytic liquid. This drum moves the strip inside the electrolytic cell.
  • the electrolysis current flows through the space of annular shape and constant width between the interior surface of the anodes and the surface of the strip to be coated, in the radial direction of the drum which defines the cylindrical winding surface of the strip.
  • This method has advantages in that the space between the electrodes in which the electrolyte is circulated can be maintained at a substantially constant value and practically independent of the flatness and the tension state of the strip which is pressed against the drum.
  • this type of radial cell installation is particularly well suited to the production of a coating on one side of the strip or to the production of coverings of different natures on each of the sides of the strip.
  • the drum is coated, at least in its end portions, with a layer of flexible material such as an elastomer.
  • the lateral parts of the strip adjacent to its two edges are brought into contact with the parts of the drum coated with flexible and waterproof material, with a contact pressure sufficient to ensure a perfect seal. This avoids any infiltration of electrolytic liquid between the drum and the metal strip.
  • the electrical contacting of the strip with the negative terminal of the current source is generally carried out by means of the strip displacement drum immersed in the cell of the electrolysis cell.
  • the drum has on its lateral surface a ferrule of a metallic alloy, placed in a central position on the drum between its end parts coated with the flexible material of the elastomer type which is an electrical insulator.
  • the lateral layers of elastomer are slightly projecting with respect to the central ferrule ensuring the electrical contact of the strip. It is therefore necessary, to bring the strip into electrical contact with the central ferrule of the drum, to exert sufficient pressure on the lateral end portions of elastomer to compress them so that the surface of the strip is in contact with the conductive ferrule over the entire surface of this ferrule.
  • the distribution of the electric field along the width of the conductive shell is not perfectly uniform and in particular, certain anomalies appear in the vicinity of the edges of the shell where the electric field increases significantly.
  • An installation comprising cells of the radial type in which the electric current is supplied to the strip by means of rollers arranged on either side of the drum, these current supply rollers associated with rollers support being placed at a relatively small distance above the level of the liquid in the cell of the electrolysis cell and the ends of the anodes.
  • the cathode current supply rollers to the strip are of very small diameter and come into contact with the strip in an area practically limited to a generator of the current supply roller. It is therefore only possible to pass a relatively low current through the strip, which limits the possibilities of the installation as regards its productivity and the production of thick coating layers.
  • the electrolysis cell although of the radial type, uses insoluble anodes which require continuous regeneration of the electrolyte during the coating process.
  • the strip is pinched, before entering the electrolytic liquid bath and at its exit, between the corresponding guide roller and the drum.
  • the guide and tension rollers ensuring the supply of electric current to the strip are of small diameter compared to the diameter of the drum and must exert a relatively large traction on the strip to ensure a tight contact of the strip. with the drum and a passage of electric current from the guide rollers to the strip without arcing.
  • the metal strip reaches the guide rollers of the electrolysis cell and leaves this electrolysis cell in a substantially horizontal direction, which is not favorable in the case where several cells are arranged one after the other. others to constitute a coating installation by depositing successive layers on the strip.
  • Chloride electrolytes have a much lower electrical resistivity than sulfate electrolytes, which generally results in less current consumption when used in an electrolytic coating installation. On the other hand, chlorides are generally more corrosive and cause faster wear of cell structures coming into contact with the electrolyte.
  • the object of the invention is therefore to propose an installation for electrolytic coating of a metal strip and in particular an installation for electrogalvanizing a steel strip comprising at least one cell consisting of a tank containing electrolytic liquid, a rotating drum with a horizontal axis fully coated on its external cylindrical lateral surface with an electrically insulating material and partially immersed in the electrolytic liquid, a set of soluble anodes in coating metal, in form of portions of rings arranged opposite the external cylindrical surface of the drum in its submerged part with which the metal strip to be coated is kept in contact, means for supplying the anodes with electric current, means for injection of electrolytic liquid between the anodes and the metal strip in contact with the drum, against the current with respect to the direction of circulation of the strip and of the sets of electrically conductive rollers in contact with the strip in an area situated above of the upper level of the electrolytic liquid in the tank electrically connected to means ensuring a circulation ion of the electric current in the metal strip and a cathodic potential of this strip with respect to the
  • the electrically conductive roller assemblies are constituted, for each of the cells, by two electrically conductive deflecting rollers over which the strip to be coated passes, rotatably mounted each around an axis parallel to the axis of the drum. , on either side of the drum and arranged at least partially below the upper level of the drum, near its external surface and two support rollers associated with each of the deflection rollers ensuring the maintenance of the strip against the deflecting roller over a substantial part of its periphery and up to an area close to the part of the external surface of the drum immersed in the electrolytic liquid.
  • the invention also relates to an electrolytic coating process using an installation according to the invention and using a chloride solution as the electrolytic liquid.
  • Figure 1 is a schematic elevational view of a cell of an electrogalvanizing installation according to the invention.
  • Figure 2 is an elevational view in partial section of the inlet portion of an electrogalvanizing installation according to the invention showing two successive electrolysis cells.
  • FIG. 3 is an enlarged view of a part of FIG. 2 showing in particular a deflector and conductive roller associated with two successive cells of the installation shown in FIG. 2.
  • FIG. 4 is a side view in elevation along line 4 in FIG. 3.
  • FIG. 5 is a side view in elevation along line 5 in FIG. 3.
  • FIG 1 there is shown, schematically, an electrolysis cell of an electrogalvanizing installation according to the invention.
  • the cell comprises a tank 1 of which only part of the side wall has been shown.
  • the tank 1 contains an electrolytic liquid 2 of the chloride type containing Cl- ions in which are immersed soluble anodes 3 of zinc or other metal.
  • the anodes 3 have the shape of portions of circular rings constituting an arc of an angular amplitude a little less than 90 °.
  • the anodes 3 are arranged two by two one after the other, with a slight spacing, so as to have an active inner surface having a wrapping arc slightly less than 180 °.
  • the anodes 3 constitute a continuous active surface of cylindrical shape whose width is at least equal to the width of the strip to be coated.
  • the soluble anodes 3 rest on two support elements 5 made of a material which is good conductor of electricity which are connected to the positive terminal of a direct current source 6, so as to bring the conductive elements 5 and the soluble anodes 3 into electrical contact with these elements, to an anode potential and to pass the electrolysis current through the soluble anodes 3.
  • a drum 8 whose diameter is slightly less than the diameter of the active cylindrical surface of the anodes 3 is rotatably mounted on the cell 1, via a horizontal axis 9.
  • the drum 8 is arranged so that the level 10 of the electrolytic liquid 2 in the tank 1 is located slightly below the diametrical plane of the drum 8.
  • the lateral surface of the drum 8 is entirely coated with an insulating material which may preferably consist of an elastomer.
  • the strip to be coated 16 for example a strip of sheet metal or of steel strip, is brought into contact with the insulating lateral surface of the drum 8 whose rotation in the direction of the arrow 13 allows the movement of the strip inside the electrolyte bath 2, opposite the active surface of the anodes 3.
  • a first ramp 14 for injecting electrolytic liquid is placed in the vicinity of the outlet end of the anode portions 3 and comprises a set of injectors 14 ′ allowing the injection of electrolytic liquid into the space provided between the portion anode 3 and the outer surface of the drum 8 over which the strip to be coated 16 passes.
  • a second injection ramp 15 is placed at the lower part of the drum, in the zone located between the lower end parts of the anode portions 3.
  • the ramp 15 is a double ramp comprising injectors 15 at each of the portions of anodes 3 directed in opposite directions for each of the parts of the double ramp 15.
  • the injectors 15 ′ connected to the ramp 15 located on the left in FIG. 1 are put into operation.
  • the electrolytic liquid circulates against the current with respect to the direction of circulation of the strip, throughout the annular space situated between the anodes 3 and the drum.
  • the level 10 of the electrolytic liquid in the tank 1 of the electrolysis cell corresponds to a level of overflow of this liquid in a space 17 (arrow 18) in which the electrolytic liquid is collected to be reinjected by the ramps 14 and 15.
  • the path of the strip 16, on either side of the drum 8 is defined by deflector rollers 20 and 20 ′ also ensuring that the strip 16 comes into contact with the surface of the drum 8, with a certain bearing pressure .
  • Two support rollers 21a and 21b maintain the strip 16 on the deflector roller 20, along a certain winding arc.
  • two support rollers 21'a and 21'b maintain the strip 16 on the deflector roller 20 ', at the outlet of the electrolysis cell.
  • the deflection rollers 20 and 20 ′ are each connected to the negative terminal of one of the direct current sources 6, in order to bring the strip to a cathodic potential and to pass the electrolysis current in the strip 16, the rollers 20 and 20 'being made entirely of a conductive material.
  • a wringing roller 22 disposed on the path of the strip 16 at the outlet of the electrolysis cell makes it possible to avoid the electrolyte entrainment by the strip 16 at its outlet from the electrolyte bath 2.
  • Figures 2 to 5 show an electrolytic coating installation according to the invention which can be used to coat a steel strip with a layer of zinc or zinc alloy on one of its faces or on its two sides.
  • This installation comprises successive electrolysis cells whose general structure is identical to the structure which has been described and which is shown in FIG. 1.
  • the corresponding elements in FIG. 1 and in FIGS. 2 to 5 have the same references.
  • FIG. 2 the input part of the installation comprising the first two electrolysis cells is shown, in the direction of movement of the strip symbolized by the arrow 24.
  • the cells 1a and 1b of the two successive electrolysis cells 25a and 25b rest on a structure common 26 constituting the support of the installation for coating the strip.
  • the tanks 1a and 1b of two successive cells have vertical end walls 27, the upper level of which determines the level of overflow of the electrolytic liquid 2 in a space 17 delimited by a wall 28 fixed on the external surface of the wall 27.
  • a pipe 29 for recovering electrolytic liquid is disposed at the lower part of each of the spaces 17 delimited by a wall 28.
  • the electrolytic liquid recovered by the lines 29 can be returned by pumps to the injection manifolds 14 and 15 which operate in the manner which has been described above.
  • the injection ramp 15 is a double ramp comprising injectors 15 ′ directed in different directions and capable of injecting electrolytic liquid into the space existing between the strip 16 and the active surface of the corresponding anode portion, in different directions.
  • This arrangement of the injection ramps 14 and 15 makes it possible to use the installation both in the direction of movement of the strip represented by the arrow 24 and in the opposite direction.
  • the deflector rollers 20 and 20 ′ of the strip are rotatably mounted around a horizontal axis parallel to the axis 9 of the drum 8, on a support 30 integral with the structure support 26 of the installation.
  • the deflection rollers 20, 20 ′ are preferably motorized, so as to facilitate the circulation of the strip 16 and to avoid sliding of this strip on the deflection roller.
  • the deflector rollers 20 and 20 ′ are electrically connected, as explained with reference to, FIG. 1, to the negative terminal of a high power direct current source capable of supplying a very high intensity at a voltage determined by the optimal conditions for carrying out the electrolysis carried out inside the cell.
  • the deflection rollers 20 and 20 ′ have a large diameter, this diameter being, in the case of the installation described, slightly greater than the radius of the drum 8 of the electrolysis cell.
  • the deflection rollers 20 and 20 ' are on the other hand placed so that at least part of the roller, and preferably a substantial part, is located at a level below the upper level of the drum 8. However, the deflecting rollers 20 and 20 ′ are arranged above the upper end of the walls 27 of the tank 1 and therefore entirely above the level 10 of the electrolyte in the corresponding tank 1.
  • Each of the successive deflector rollers 20 and 20 ′ constitutes both the input roller of a cell electrolytic and the output roller of the previous electrolytic cell.
  • the roller 20 shown in FIG. 3 constitutes the inlet roller of the electrolytic cell 25b and the outlet roller of the electrolytic cell 25a.
  • the sheet metal strip 16 is returned substantially at 180 ° by the successive deflection rollers 20 and 20 ′ 20 ′ with the exception of the initial roller 20a which returns the strip 16 to 90 °.
  • the support rollers 21a and 21b placed on either side of the deflector roller 20 ensure that the strip 16 is pressed onto the roller 20 in an arc at least equal to 190 °. A large contact surface is thus obtained between the strip 16 and the roller 20 by the fact that this roller has a large diameter and a large amplitude winding arc. It is therefore possible to pass a very high intensity of cathode current through the strip.
  • a deflector roller 20 constituting the output roller of a first electrolysis cell 25 and the input roller of the next electrolysis cell 25 '.
  • the deflector roller 20, the diameter of which is slightly greater than half the diameter of the drums 8 and 8 ′ of the cells 25 and 25 ′ is placed on its support 30, so that a substantial part of the roller 20 is disposed at a level below the upper level of the drums 8 and 8 '.
  • the deflector roller 20 is interposed between the drums 8 and 8 'so that part of its lateral surface is close to the lateral surface of the drum 8 and another part of its surface is close to the outer surface of the drum 8 '.
  • the axis of rotation of the deflector roller 20 is in a vertical plane equidistant from the end walls 27 of the successive cells 25 and 25 '.
  • the support rollers 21a and 21b which have been shown in FIG. 3 in solid lines in their operating position ensure, in this position, the contact of the strip 16 with the lateral surface of the deflector roller 20, in two generators located below the horizontal diametrical plane of the deflector roller 20. In this way, the strip 16 is kept in contact with the deflector roller 20 of large diameter, over an arc length greater than 180 ° and generally close to or a little more than 190 °.
  • the support rollers 21a and 21b are in contact with the deflector roller 20 over its entire length so that the contact surface between the strip 16 and the deflector roller 20 has a very important dimension. It is therefore possible to pass an electric current of very great intensity between the conductive roller 20 connected to the direct current source and the steel strip 16 in circulation.
  • the support rollers 21a and 21b ensure perfect contact of the strip with the deflector roller, without it being necessary to exert significant traction on the strip. This reduces the possibility of arcing between the strip and the roller.
  • the density of cathode current flowing from the roller to the strip can be reduced as long as the contact area is large.
  • the support rollers are arranged in a narrow width interval delimited by the surfaces facing the deflector roller and the corresponding drum.
  • This arrangement close to the area where the deflector roller is closest to the drum makes it possible to ensure effective contact between the strip and the deflector roller by which the strip is supplied with electric electrolysis current, in an area close to the part drum 8 or 8 'immersed under level 10 of the electrolyte bath in cells 25 and 25'.
  • the electric current therefore travels a short length of the strip 16 before reaching the annular zone where the electrolysis takes place situated between the soluble anodes 3 and the corresponding drum 8 or 8 ′, this zone comprising an upper inlet part located just below level 10 of the electrolyte bath.
  • FIGS. 3, 4 and 5 it can be seen that the support rollers 21a and 21b are fixed at their longitudinal ends, on lever arms 31a and 31'a, as regards the support roller 21a and 31b and 31′b as regards the roller 21b, the lever arms themselves being articulated about a horizontal axis on a corresponding support 32 resting on the fixed frame 33 of the installation.
  • each of the levers 31a, 31'a, 31b, 31'b opposite the end connected to the corresponding support rollers 21a or 21b is articulated, around a horizontal axis, to the rod 34 a cylinder 35.
  • this roller By extraction or retraction of the rods 34 of the jacks 35 associated with a support roller 21a or 21b, this roller can be moved between its service position, shown in solid lines in FIG. 4 where the roller ensures the support of the strip 16 on the deflection roller 20, and an out-of-service position, shown in broken lines in FIG. 4 where the corresponding support roller is distant from the lateral surface of the deflector roller 20 and is no longer in contact with the strip of sheet 16.
  • the actuating cylinders 35 for the support rollers are mounted on the upper part of the support 32 resting on the frame 33 of the installation.
  • the bearings 36 in which the ends of the shaft of the deflector roller 20 are mounted also rest on the frame 33 of the installation, by means of a support 37 on which the support 32 of the support rollers is fixed.
  • an extractor roller 22 is rotatably mounted about a horizontal axis parallel to the axis of the deflector roller 20 and the drum 8 ', between two end flanges 42 and 42' integral an axis 43 parallel to the axis of the deflector roller 20, the ends of which are fixed to a lever arm 44 or 44 'connected in an articulated manner to the rod of an actuating cylinder 45 or 45' fixed, by the 'through a support, on the fixed frame 33 of the installation.
  • the actuation of the jacks 45 and 45 ' makes it possible to rotate the axis 43 in one direction or the other so as to move the wringing roller 22 between its service position shown in solid lines in FIG. 3 in which the roller 22 is in contact with the sheet metal strip 16 and an out of service position in which the roller 22 is no longer in contact with the strip 16.
  • the dewatering roller comprises a tubular metal core rotatably mounted by means of bearings on the axis of the roller 22, the ends of which are fixed to the flanges 42 and 42 'and an external coating of flexible material coming into contact with the metal strip 16 , in the service position of the wringing roller.
  • the wringing roller comes into contact with the strip 16, in the part of this strip coming into contact with the drum 8, immediately above the level 10 of the electrolyte bath and the end of the soluble anodes 3 In this way, the strip 16 is pinched between the drain roller 22 and the drum 8, so that it is possible to exert a relatively strong spin pressure on the sheet, by means of the flexible outer surface. of the wringer 22, thanks to the actuating cylinders 45 and 45 '.
  • the arrangement of a single wringing roller bearing on the drum 8 in an area located just above the level 10 of the electrolyte makes it possible to increase the efficiency of the wringing of the strip as it exits. the electrolysis cell while avoiding lengthening the length of the sheet metal strip 16 between the corresponding support roller 21a and the annular electrolysis zone.
  • This arrangement of the wringing roller makes it possible to avoid the use of pinching and wringing rollers in a free part of the strip situated between the deflecting roller and the drum.
  • the installation further comprises a sanding assembly 48 of the lateral surface of the deflector roller 20 secured to an axis 49 rotatably mounted at its ends in supports 46 'similar to the supports 46 receiving the end parts of the axis 43 for supporting and positioning the wringing roller 22.
  • the sanding assembly 48 fixed on the axis 49 can be moved between an active position in contact with the corresponding deflector roller and an inactive position remote from the roller by means of jacks such as 50 connected to the ends of the axis 49 by the intermediate of articulated connecting rods.
  • the dewatering roller 22 and the sanding assembly 48 of the deflector roller 20 are placed on either side of the vertical plane of symmetry of the roller 20.
  • the supports 46 and 46 ′ have openings allowing mounting in these supports located on either side of the plane of symmetry of the deflector roller 20 or of the wringer assembly 43, 42, 22, or of the '' sanding set 48, 49.
  • injection assemblies 14 disposed at the inlet and outlet of the drums 8 and 8 'respectively. These injection assemblies comprise a very large number of small diameter injectors 14 ′ opening into the annular electrolysis space delimited by the corresponding drum and the sheet on the one hand and the internal active surface of the soluble anodes on the other. go.
  • one of the assemblies 14 is put into operation, according to the direction of circulation of the strip 16 in the installation.
  • the installation according to the invention can be implemented using an electrolytic bath consisting of a chloride having good electrical conductivity.
  • an electrolytic bath consisting of a chloride having good electrical conductivity.
  • the implementation of the installation according to the invention has all the advantages of known methods with radial cells, in particular as regards the production of a high quality coating on one of the faces of the strip.
  • the installation according to the invention makes it possible to avoid the drawbacks of known methods with radial cells using a conductive ferrule wound on the drum, that is to say the need to exert significant pulls on the strip and the formation of longitudinal traces corresponding to shell marks.
  • the installation according to the invention can comprise a large number of cells, which makes it possible to increase the speed of circulation of the strip and therefore the productivity of the installation.
  • This installation can also be very easily and quickly adapted to one direction of traffic or another of the strip to be coated.
  • the installation and the method according to the invention can be easily adapted to the production of a sheet coated on its two faces with identical or different layers constituted for example by zinc or zinc layers containing iron or nickel.
  • the size and arrangement of the deflection rollers and the support rollers associated with these deflection rollers may be different from those which have been described, the arc for winding the strip on the deflection rollers may have a variable value.
  • the dewatering rollers located at the outlet of the electrolysis cells can be produced in a different manner from that which has been described and likewise, the circulation of the electrolyte in the annular zone situated between the drum and the soluble anodes can be performed in a manner different from that which has been described.
  • the installation according to the invention can be used with different electrolytes of chloride solutions and the electrical parameters for conducting the process can be determined in the usual way, depending on the operating conditions of the installation.
  • the installation and the method according to the invention can be used not only for the electrogalvanization of steel sheets but also in the case of the production of a metallic coating of any kind on a steel sheet or strip or on any other metallic support in the form of a strip of great length.

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  • Chemical & Material Sciences (AREA)
  • Organic Chemistry (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Electrochemistry (AREA)
  • Materials Engineering (AREA)
  • Metallurgy (AREA)
  • Engineering & Computer Science (AREA)
  • Electroplating Methods And Accessories (AREA)
  • Electrolytic Production Of Metals (AREA)
  • Adhesive Tapes (AREA)
  • Paints Or Removers (AREA)
  • Application Of Or Painting With Fluid Materials (AREA)
  • Coating Apparatus (AREA)

Claims (10)

  1. Einrichtung zum elektrolytischen Beschichten eines Metallbandes (16), und insbesondere Einrichtung zum Elektroverzinken eines Stahlbandes, mit wenigstens einer Zelle (25), die durch einen Elektrolytflüssigkeit (2) enthaltenden Behälter (1), eine Drehtrommel (8, 8') mit horizontaler Achse, welche auf ihrer äußeren Mantelfläche mit einem elektrisch isolierenden Material gänzlich beschichtet und teilweise in die Elektrolytflüssigkeit (2) eingetaucht ist, einen Aufbau aus löslichen Anoden (3) aus Beschichtungsmetall in Form von Ringabschnitten, die der äußeren zylindrischen Oberfläche der Trommel (8, 8') in ihrem eingetauchten Teil, mit dem das zu beschichtende Metallband (16) in Berührung gehalten wird, gegenüberliegen, Mittel (6) zur Versorgung der Anoden (3) mit elektrischem Strom, Mittel (14, 15) zum Einspritzen von elektrolytischer Flüssigkeit zwischen die Anoden (3) und das mit der Trommel (8) in Berührung stehende Metallband im Gegenstrom in Bezug auf den Umlaufsinn des Bandes (16), und Aufbauten aus elektrisch leitenden Rollen (20, 21), die mit dem Band (16) in einer über dem oberen Niveau (10) der elektrolytischen Flüssigkeit (2) in dem Behälter (1) liegenden Zone in Berührung stehen und mit Mitteln (6) elektrisch verbunden sind, die einen elektrischen Stromfluß in dem Metallband (16) und ein Setzen dieses Bandes (16) auf ein kathodisches Potential in Bezug auf die löslichen Anoden (3) gewährleisten, gebildet ist, dadurch gekennzeichnet, daß die Aufbauten aus elektrisch leitenden Rollen (20, 21) für jede der Zellen (25) durch zwei elektrisch leitende Ablenkrollen (20), die jeweils um eine zur Achse der Trommel (8, 8') parallele Achse drehbar beiderseits der Trommel (8, 8') angebracht und wenigstens teilweise unter dem Oberniveau der Trommel (8, 8') in der Nähe ihrer Außenfläche angeordnet sind, und zwei Stützrollen (21a, 21b) gebildet sind, die jeder der Ablenkrollen (20, 20') zugeordnet sind und das Halten des Bandes (16) gegen die Ablenkrolle (20, 20') auf einem wesentlichen Teil ihres Umfanges und bis zu einer Zone in der Nähe des in die Elektrolytflüssigkeit eingetauchten Teils der Mantelfläche der Trommel (8, 8') gewährleisten.
  2. Einrichtung nach Anspruch 1, dadurch gekennzeichnet, daß die Stützrollen (21a, 21b) drehbar am Ende von Hebelarmen (31a, 31'a, 31b, 31'b) angebracht sind, die auf einem feststehenden Rahmen (33) der Einrichtung angelenkt und an ihren den Rollen (21a, 21b) abgewandten Enden mit Betätigungsstellgliedern (35) zum Verlagern der Stützrollen zwischen einer Betriebsstellung in Berührung mit dem Band (16) und einer Außerbetriebsstellung entfernt von dem auf der entsprechenden Ablenkrolle (20) vorbeilaufenden Band (16) verbunden sind.
  3. Einrichtung nach einem der Ansprüche 1 und 2, dadurch gekennzeichnet, daß eine Trocknerrolle (22), deren Achse zur Achse der Trommel (8) parallel ist, so angeordnet ist, daß sie mit der Seite des Bandes (16), auf welcher der Überzug ausgebildet wird, in einer Zone in Berührung kommt, wo das Band (16) mit der Trommel (8) in Berührung ist und die über dem oberen Niveau (10) des Elektrolyten im Behälter (1) der Zelle (25) und unter der Stützrolle (21a), die das Halten des Bandes (16) gegen die Ablenkrolle (20) gewährleistet, auf der Seite der Trommel (8) liegt, die dem Ausgang der Elektrolysezelle (25) entspricht.
  4. Einrichtung nach Anspruch 3, dadurch gekennzeichnet, daß die Trocknerrolle (22) drehbar auf einer Achse angebracht ist, die an ihren Enden mit Flanschen (42, 42') fest verbunden ist, die auf einer Welle (43) befestigt sind, die mit Betätigungsstellgliedern (45, 45') verbunden ist, derart, daß die Rolle (22) zwischen einer Betriebsstellung, wo die Rolle (22) mit dem Band (16) unter einem gewissen Druck in Berührung gebracht wird, und einer inaktiven Stellung, wo die Rolle (22) vom Band (16) entfernt ist, versetzt wird.
  5. Einrichtung nach irgendeinem der Ansprüche 1 bis 4, dadurch gekennzeichnet, daß die Stützrollen (21a, 21b) in Bezug auf die entsprechenden Ablenkrollen (20) so angeordnet sind, daß das Band (16) auf der Ablenkrolle (20) längs eines Belegungsbogens einer über 180° liegenden Ausdehnung gehalten wird.
  6. Einrichtung nach einem der Ansprüche 1 bis 5, dadurch gekennzeichnet, daß jede der Ablenkrollen (20) die zwischen zwei Trommeln (8) von zwei aufeinanderfolgenden Elektrolysezellen (25a, 25b) zwischengelegt sind, dem Band eine Umlenkung von im wesentlichen 180° in vertikaler Richtung auferlegt.
  7. Einrichtung nach irgendeinem der Ansprüche 1 bis 6, dadurch gekennzeichnet, daß die leitenden Ablenkrollen (20, 20°) einen Durchmesser aufweisen, der wenigstens gleich dem halben Durchmesser der entsprechenden Trommel (8, 8') ist.
  8. Einrichtung nach irgendeinem der Ansprüche 1 bis 7, dadurch gekennzeichnet, daß sie für jede der Zellen (25) einen Trocknungsaufbau (22) und wenigstens eine Einrichtung (14, 14') zum Einspritzen von Elektrolytflüssigkeit zwischen die Anoden (3) und das Band (16) aufweist, die so anpaßbar sind, daß eine Änderung des Umlaufsinnes des Bandes (16) in der aufeinanderfolgende Elektrolysezellen (25) aufweisenden Einrichtung gestattet ist.
  9. Verfahren zum elektrolytischen Beschichten eines Metallbandes, und insbesondere Verfahren zum Elektroverzinken eines Stahlbandes in einer Einrichtung, die wenigstens eine Zelle des Radialtyps mit löslichen Anoden aufweist, dadurch gekennzeichnet, daß man das Band (16) am Eingang und am Ausgang der Zelle (25) des Radialtyps mit der Oberfläche einer Ablenkrolle auf einem wesentlichen Teil des Umfangs dieser Ablenkrolle (20, 20') bis in eine Zone der Ablenkrolle, die in der Nähe des oberen Niveaus (10) des Elektrolyten in der Zelle des Radialtyps liegt, in Berührung bringt, daß man das Band im Elektrolyten in Berührung mit der Oberfläche einer mit einem isolierenden Material beschichteten Trommel (8) vor aktiven Flächen der in den Elektrolyten eingetauchten löslichen Anoden (3) umlaufen läßt,
       - daß man das Band mit kathodischem Strom über die leitenden Ablenkrollen (20, 20') speist, wobei der Elektrolyt durch ein Chlorid gebildet ist.
  10. Verfahren nach Anspruch 9, dadurch gekennzeichnet, daß man das Band (16) über dem oberen Niveau (10) des Elektrolytenbads am Ausgang der Zelle (25) in Berührung mit der Trommel (8) trocknet.
EP90402956A 1989-10-27 1990-10-19 Verfahren und Vorrichtung zur Elektroplattierung eines metallischen Bandes Expired - Lifetime EP0425354B1 (de)

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FR8914167 1989-10-27
FR8914167A FR2653787B1 (fr) 1989-10-27 1989-10-27 Installation et procede de revetement electrolytique d'une bande metallique.

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CN105696059B (zh) * 2016-02-02 2018-03-06 上海大学 磁场下高强高导铜‑纳米碳管复合材料的制备方法及装置
KR102639119B1 (ko) 2018-12-31 2024-02-20 엘지디스플레이 주식회사 전기 도금 장치 및 이를 이용한 전기 도금 방법
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FR2653787A1 (fr) 1991-05-03
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CN1051205A (zh) 1991-05-08
DE69005788D1 (de) 1994-02-17
JPH083155B2 (ja) 1996-01-17
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ATE99741T1 (de) 1994-01-15
DE69005788T2 (de) 1994-08-11
BR9005419A (pt) 1991-09-17
HUT56144A (en) 1991-07-29
HU206138B (en) 1992-08-28
CA2028664A1 (fr) 1991-04-28
PL287530A1 (en) 1991-06-03
HU906913D0 (en) 1991-05-28
JPH03207892A (ja) 1991-09-11
AU6492390A (en) 1991-05-02
KR910008177A (ko) 1991-05-30
US5188720A (en) 1993-02-23
KR930005265B1 (ko) 1993-06-17
FR2653787B1 (fr) 1992-02-14

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