EP3561133B1 - Dispositif et procédé de revêtement par immersion à chaud d'une bande métallique avec au moins deux couches - Google Patents

Dispositif et procédé de revêtement par immersion à chaud d'une bande métallique avec au moins deux couches Download PDF

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Publication number
EP3561133B1
EP3561133B1 EP19168561.9A EP19168561A EP3561133B1 EP 3561133 B1 EP3561133 B1 EP 3561133B1 EP 19168561 A EP19168561 A EP 19168561A EP 3561133 B1 EP3561133 B1 EP 3561133B1
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EP
European Patent Office
Prior art keywords
vessel
metal strip
melt
transition
disposed
Prior art date
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EP19168561.9A
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German (de)
English (en)
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EP3561133A1 (fr
Inventor
Michael Peters
Frank Spelleken
Jegor Bergen
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.)
ThyssenKrupp Steel Europe AG
ThyssenKrupp AG
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ThyssenKrupp Steel Europe AG
ThyssenKrupp AG
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Publication of EP3561133A1 publication Critical patent/EP3561133A1/fr
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    • C—CHEMISTRY; METALLURGY
    • C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
    • C23C—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THE SURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTION; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL
    • C23C2/00—Hot-dipping or immersion processes for applying the coating material in the molten state without affecting the shape; Apparatus therefor
    • C23C2/04—Hot-dipping or immersion processes for applying the coating material in the molten state without affecting the shape; Apparatus therefor characterised by the coating material
    • C23C2/06—Zinc or cadmium or alloys based thereon
    • C—CHEMISTRY; METALLURGY
    • C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
    • C23C—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THE SURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTION; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL
    • C23C2/00—Hot-dipping or immersion processes for applying the coating material in the molten state without affecting the shape; Apparatus therefor
    • C23C2/003—Apparatus
    • C23C2/0034—Details related to elements immersed in bath
    • C23C2/00342—Moving elements, e.g. pumps or mixers
    • C23C2/00344—Means for moving substrates, e.g. immersed rollers or immersed bearings
    • C—CHEMISTRY; METALLURGY
    • C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
    • C23C—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THE SURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTION; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL
    • C23C2/00—Hot-dipping or immersion processes for applying the coating material in the molten state without affecting the shape; Apparatus therefor
    • C23C2/003—Apparatus
    • C23C2/0034—Details related to elements immersed in bath
    • C23C2/00348—Fixed work supports or guides
    • C—CHEMISTRY; METALLURGY
    • C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
    • C23C—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THE SURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTION; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL
    • C23C2/00—Hot-dipping or immersion processes for applying the coating material in the molten state without affecting the shape; Apparatus therefor
    • C23C2/003—Apparatus
    • C23C2/0036—Crucibles
    • C—CHEMISTRY; METALLURGY
    • C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
    • C23C—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THE SURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTION; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL
    • C23C2/00—Hot-dipping or immersion processes for applying the coating material in the molten state without affecting the shape; Apparatus therefor
    • C23C2/04—Hot-dipping or immersion processes for applying the coating material in the molten state without affecting the shape; Apparatus therefor characterised by the coating material
    • C23C2/12—Aluminium or alloys based thereon
    • C—CHEMISTRY; METALLURGY
    • C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
    • C23C—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THE SURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTION; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL
    • C23C2/00—Hot-dipping or immersion processes for applying the coating material in the molten state without affecting the shape; Apparatus therefor
    • C23C2/34—Hot-dipping or immersion processes for applying the coating material in the molten state without affecting the shape; Apparatus therefor characterised by the shape of the material to be treated
    • C23C2/36—Elongated material
    • C23C2/40—Plates; Strips
    • C—CHEMISTRY; METALLURGY
    • C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
    • C23C—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THE SURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTION; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL
    • C23C28/00—Coating for obtaining at least two superposed coatings either by methods not provided for in a single one of groups C23C2/00 - C23C26/00 or by combinations of methods provided for in subclasses C23C and C25C or C25D
    • C23C28/02—Coating for obtaining at least two superposed coatings either by methods not provided for in a single one of groups C23C2/00 - C23C26/00 or by combinations of methods provided for in subclasses C23C and C25C or C25D only coatings only including layers of metallic material
    • C23C28/023—Coating for obtaining at least two superposed coatings either by methods not provided for in a single one of groups C23C2/00 - C23C26/00 or by combinations of methods provided for in subclasses C23C and C25C or C25D only coatings only including layers of metallic material only coatings of metal elements only
    • C23C28/025—Coating for obtaining at least two superposed coatings either by methods not provided for in a single one of groups C23C2/00 - C23C26/00 or by combinations of methods provided for in subclasses C23C and C25C or C25D only coatings only including layers of metallic material only coatings of metal elements only with at least one zinc-based layer

Definitions

  • the invention relates to a device for hot-dip coating a metal strip with at least two layers, with a continuous furnace for passing through and heating the metal strip, with a first vessel filled with a melt arranged in the direction of travel of the metal strip behind the continuous furnace, and with at least one second vessel filled with a melt , with a snout arranged between the continuous furnace and the first vessel for guiding and introducing the metal strip into the melt in the first vessel, with a transition arranged between the vessels for guiding the metal strip through, with at least one deflection roller arranged in the second vessel for deflecting and discharging the metal band from the second vessel.
  • the invention also relates to a method for hot-dip coating a metal strip with at least two layers, the metal strip being passed through a continuous furnace and heated, the heated metal strip being passed through a nozzle arranged behind the continuous furnace in the direction of travel of the metal strip and into a first one filled with a melt Vessel is introduced and the metal strip is coated with a first layer, the metal strip coated with a first layer is passed through a transition and introduced into at least a second vessel filled with a melt and coated with a second layer, which is coated with the second layer Metal strip is deflected over at least one deflection roller and discharged from the melt in the second vessel.
  • Methods and devices for hot-dip coating metal strips with two layers of chemically different composition are known from the prior art, see for example DE 10 2013 101 131 A1 , DE 10 2013 101 132 A1 and DE 10 2013 101 134 B3 .
  • the devices known from the prior art for hot-dip coating a metal strip with two different coatings or for setting a coating gradient using coating compositions of the same type is passed through two vessels each filled with a melt and coated one after the other, with the respective melts being separated from one another by a relatively simple trained cone-shaped transition between the first vessel and the second vessel takes place in such a way that during the coating operation the metal strip running through the transition is operated at a sufficiently high speed so that turbulence of the melt occurs within the conical transition and the melt is thereby circulated within the conical transition, causing the melt to escape from the Transition is prevented with a tapering towards the outlet cross-section in the second vessel substantially.
  • An exit of the melt from the first vessel or a mixing of the melts can essentially only be realized with constant operation at high belt speeds. Operating fluctuations, for example due to fluctuating belt speeds or low belt speeds, can have a disadvantageous effect. With regard to the state of the art, there is still a need for optimization.
  • the object of the invention is to provide a device and a method for hot-dip coating a metal strip, in particular a steel strip with at least two layers, with which an operationally reliable coating process can be ensured under fluctuating operating conditions or at low strip speeds.
  • a device for hot-dip coating a metal strip with at least two layers with a continuous furnace for passing through and heating the metal strip, with a first vessel filled with a melt arranged behind the continuous furnace in the direction of travel of the metal strip and with at least one second vessel filled with a melt, with a nozzle arranged between the continuous furnace and the first vessel for guiding and introducing the metal strip into the melt in the first vessel, with a transition arranged between the vessels for guiding the metal strip through, with at least one deflection roller arranged in the second vessel for deflecting and guiding out the metal strip from the second vessel, with at least one electromagnetic means being arranged at the transition.
  • the inventors have found that arranging at least one electromagnetic means, in particular at least one inductor, at the transition can effectively close the transition or the exit region of the transition, so that the melt can escape from the first vessel via the transition and thus a Mixing of the melts can be prevented, regardless of the mode of operation or decoupled from the belt speed.
  • the melt in the first vessel or in the transition which is connected in particular to the vessel, is a metallic melt, for example it consists of zinc or a zinc alloy or aluminum or an aluminum alloy.
  • the electromagnetic means in particular if at least two electromagnetic means are each arranged parallel to the surface of the metal strip, generates or generate an alternating magnetic field by applying a current, which essentially influences the melt in transition in such a way that the melt sinks against gravity is effectively prevented.
  • the alternating magnetic field can preferably be adjusted individually and to the metallic melt used in each case.
  • At least one heating means is provided, which is arranged in particular in the running direction of the metal strip between the first and second vessel.
  • the electromagnetic means or means are encased.
  • the electromagnetic means or means can in particular also be housed in a media-tight manner, d. H. that the electromagnetic means can be operated without damage by being immersed or admitted into a melt.
  • the transition opens out at least in sections in the second vessel, in particular the transition dips at least in sections into the melt in the second vessel.
  • the metal strip runs through the two vessels without being exposed to the atmosphere or the environment, so that no contact can take place, in particular with oxygen, which could damage the surface of the metal strip, in particular the surface of the metal strip coated with the first layer would affect negatively.
  • the first vessel is arranged at least in sections in the second vessel. Because of with a small installation space, for example, existing, conventional hot-melt coating systems can also be retrofitted with at least one second vessel with a transition and at least one electromagnetic means arranged at the transition.
  • the first vessel can be arranged in the second vessel in such a way that the level of the melt in the first vessel corresponds to the level of the melt in the second vessel.
  • the transition is perpendicular or at an angle to the horizontal.
  • At least one extension piece is provided, through which the metal strip can be passed, which is directly connected to the transition of the first vessel or to the first vessel, the extension piece in particular opening out at least in sections into the second vessel.
  • the extension piece dips at least in sections into the melt in the second vessel.
  • At least a third vessel filled with a melt is provided, which is arranged in particular in the direction of travel of the metal strip between the first and the second vessel, in particular the third vessel has a transition and/or is connected to a transition, wherein in particular at least one electromagnetic means is arranged at the transition.
  • This design enables a metal strip to be coated with at least three layers.
  • At least one heating means is provided, which is arranged in particular in the direction of travel of the metal strip between the third and second vessel.
  • the heat treatment leads to a flow of material depending on the temperature and time or to a material diffusion, in which case iron in particular can diffuse from the steel strip into the coated layer and stabilize it.
  • At least one extension piece is provided, through which the metal strip can be passed, which is directly connected to the transition of the first vessel or to the first vessel, with the extension piece in particular opening out at least in sections into the third vessel, and with at least one Extension piece is provided, through which the metal strip can be passed, which is directly connected to the transition of the third vessel or to the third vessel, wherein in particular the extension piece at least partially opens into the second vessel.
  • the heating means is arranged in and/or on the extension piece.
  • the heating means is preferably arranged in the extension piece on both sides essentially parallel to the surface of the metal strip and is in particular designed as an inductive heating means.
  • the metal strip coated with a layer can be heated quickly and effectively by means of induction or heated to a predefined temperature in order to be able to form a stable layer on the metal strip, in particular through a material flow/material diffusion of chemical elements from the metal strip.
  • At least two deflection rollers are arranged in the second vessel.
  • a first deflection roller for receiving the incoming metal strip and deflection by approximately 90° and a second deflection roller for receiving the material deflected by the first deflection roller can be used if the entry is vertical Be provided metal strip and deflection of the metal strip by about another 90 ° for discharging the metal strip from the second vessel in the second vessel.
  • this task can also be performed by just one deflection roller in the second vessel.
  • a method for hot-dip coating a metal strip with at least two layers in particular with an aforementioned device according to the invention, wherein the metal strip is passed through and heated in a continuous furnace, the heated metal strip is passed through a nozzle arranged behind the continuous furnace in the direction of travel of the metal strip and is introduced into a first vessel filled with a melt, and the metal strip is coated with a first layer, which is coated with a metal strip coated with the first layer is guided through a transition and introduced into at least one second vessel filled with a melt and coated with a second layer, the metal strip coated with the second layer is deflected over at least one deflection roller and discharged from the melt in the second vessel , wherein at least one electromagnetic means is arranged at the transition, which closes the transition, so that the melt is prevented from escaping from the first vessel via the transition.
  • the melt in the first vessel differs chemically from the melt in the second vessel.
  • the melt in the third vessel can also differ from the melts in the first and second vessels.
  • the melts are of the same type, in particular zinc or aluminum alloys, individual alloy components that may or may not be present in the respective melts in different proportions can set or form corresponding gradients in the individual layers of the coatings.
  • the metal strip is introduced vertically into the first and/or second vessel.
  • the metal strip coated with a first layer is passed through a transition and introduced into at least a third vessel filled with a melt and coated with a third layer before it is introduced into at least a second vessel filled with a melt and with a second layer is coated.
  • the metal strip coated with the first layer is heated in order to form a stable layer on the metal strip, in particular through a material flow/material diffusion of chemical elements from the metal strip, before it is coated with the third and/or second layer.
  • the melts in the first, second and/or third vessel can have different melt bath temperatures. This is particularly advantageous with regard to wettability and adhesion when coating high-alloy metals, preferably high-alloy steels, since high-alloy metals, preferably high-alloy steels, often have imperfections in the alloy layer with conventional coating, especially at conventional melting bath temperatures. It has been shown that higher melting bath temperatures increase or promote the formation of a closed alloy layer. In the case of two or more vessels to be passed through with melts at different temperatures, the first melt, viewed in the throughput direction, can have a significantly higher temperature level than the actual melt, which is conventionally tempered and intended for the actual coating.
  • the first melt preferably has a higher temperature than the second and/or third melt, the difference being in particular at least 10 K, preferably at least 17 K, particularly preferably at least 24 K.
  • the solubility of the iron in the steels decreases, so that the tendency for slag formation in the melt decreases.
  • the volume of the melt, in particular the first, higher-temperature melt is preferably selected to be smaller than the vessels for the other melts, so that slag formation is reduced overall.
  • the same or different atmospheres can be set in the snout and in the transitions in front of or between the vessels.
  • different dew points can also be set.
  • FIG 1 a schematic device is shown as it is known from the prior art.
  • the device is suitable for the hot-dip coating of a metal strip (1), preferably a steel strip (1) with two layers, with a continuous furnace (not shown) for passing through and heating the metal strip (1), with a first one arranged behind the continuous furnace in the running direction of the metal strip with a melt (11.1)-filled vessel (11) and with at least one second vessel (12) filled with a melt (12.1), with a nozzle (13) arranged between the continuous furnace and the first vessel (11) for guiding and introducing the metal strip ( 1) into the melt (11.1) in the first vessel (11), with a transition (11.2) arranged between the vessels (11, 12) for guiding the metal strip (1) through, with a deflection roller (15 ) for deflecting and diverting the metal strip (1) from the second vessel (12).
  • a deflection roller (15 ) for deflecting and diverting the metal strip (1) from the second vessel (12).
  • the metal strip (1) is passed over two vessels (11, 12) each filled with a melt (11.1, 12.1) and coated one after the other, the respective melts (11.1, 12.1) being separated from one another by a relatively simply designed conical transition (11.2 ) between the first vessel (11) and the second vessel (12) takes place in such a way that during the coating operation the metal strip (1) running through the transition (11.2) is operated at a sufficiently high strip speed so that within the conical transition (11.2) Swirls (11.3) arise in the melt (11.1), which essentially prevent the melt (11.1) from escaping from the transition (11.2) with a cross section tapering in the direction of the outlet into the second vessel (12).
  • Additional stabilizing rollers (16) can be arranged in the second vessel, which in particular stabilize the metal strip (1) as it emerges from the melt (12.1) in the second vessel (12) and ensure a smooth cause the strip to run, in particular in connection with stripping nozzles (19) arranged above the second vessel on both sides of the exiting metal strip (1) for adjusting the layer thickness on the metal strip (1), preferably for adjusting a constant layer thickness.
  • figure 2 shows in contrast to figure 1 a device (10) according to a first embodiment of the invention with at least one electromagnetic means (14) arranged at the transition (11.2) of the first vessel (11) in order to ensure a reliable coating process even under fluctuating operating conditions or at low belt speeds.
  • the electromagnetic means (14), in particular the at least two electromagnetic means (14), are each arranged essentially parallel to the surface of the metal strip (1).
  • the means (14) are arranged or installed outside of the transition (11.2).
  • the transition (11.2) is conical and angled to the horizontal.
  • the transition (11.2) can be designed as a separate component and connected to the first vessel (11) or be designed integrally and in one piece with the first vessel (11).
  • the electromagnetic means (14) are housed in a media-tight manner, since they are in the melt (12.1) in the second vessel (12).
  • figure 3 shows in contrast to figure 2 a device (10) according to a second embodiment of the invention with a transition (11.2) which has a cross-section that is essentially constant in the longitudinal direction and is designed at an angle to the horizontal, in particular with side parts running essentially parallel to the surface of the metal strip (1), and in particular at least two electromagnetic means (14) arranged at the transition (11.2).
  • the electromagnetic means (14) are arranged or installed outside of the transition (11.2).
  • the transition (11.2) can be designed as a separate component and connected to the first vessel (11) or be designed integrally and in one piece with the first vessel (11).
  • the electromagnetic means (14) are housed in a media-tight manner, since they are in the melt (12.1) in the second vessel (12).
  • the housing is marked with (20) as an example.
  • figure 4 shows in contrast to figure 3 a device (10) according to a third embodiment of the invention with a transition (11.2) which has a cross section that is essentially constant in the longitudinal direction and is designed perpendicular or vertical to the horizontal, in particular with side parts running essentially parallel to the surface of the metal strip (1).
  • a transition (11.2) which has a cross section that is essentially constant in the longitudinal direction and is designed perpendicular or vertical to the horizontal, in particular with side parts running essentially parallel to the surface of the metal strip (1).
  • the electromagnetic means (14) are arranged or installed outside of the transition (11.2).
  • the transition (11.2) can be designed as a separate component and connected to the first vessel (11) or be designed integrally and in one piece with the first vessel (11).
  • the electromagnetic means (14) can be housed.
  • the metal strip (1) enters vertically through the first vessel (11) filled with a melt (11.1) and vertically into the second vessel (12) filled with a melt (12.1), is guided via a first deflection roller (15) to receive the incoming metal strip (1) and deflection by approximately 90° and a second deflection roller (15) for receiving the metal strip (1) deflected by the first deflection roller (15) and deflection of the metal strip (1) by approximately a further 90° to discharge the Metal strip (1) out of the second vessel (12).
  • the transition (11.2) opens at least in sections into the second vessel (12). In other words, the transition (11.2) is immersed at least in sections, in particular the area on the outlet side, in the melt (12.1) in the second vessel (12) in order to prevent the metal strip (1) from coming into contact with the oxygen in the atmosphere.
  • figure 5 shows in contrast to figure 4 a device (10) according to a fourth embodiment of the invention, wherein at least a third vessel (17) filled with a melt (17.1) is provided, which is located between the first vessel (11) and the second vessel (12 ) is arranged.
  • the third vessel (17) has a transition (17.2) and/or is connected to a transition (17.2), at least one electromagnetic means (14) being arranged on the transition (17.2).
  • the metal strip (1) is passed through and heated in a continuous furnace (not shown).
  • the heated metal strip (1) is passed through a nozzle (13) arranged behind the continuous furnace in the running direction of the metal strip (1) and introduced or passed through a first vessel (11) filled with a melt (11.1) and coated with a first layer .
  • the metal strip (1) coated with a first layer is passed through the transition (11.2) and introduced or passed through a third vessel (17) filled with a melt (17.1) and coated with a third layer.
  • the metal strip (1) coated with a third layer is passed through the transition (17.2) and introduced into a second vessel (12) filled with a melt (12.1) and coated with a second layer.
  • the metal strip (1) coated with the second layer is deflected over two deflection rollers (15) arranged in the second vessel (12) and discharged from the melt (12.1) in the second vessel (12).
  • Electromagnetic means (14) for electromagnetic sealing of the vessels (12, 17) or transitions (11.2, 17.2) are arranged at the transitions (11.2, 17.2) of the first and third vessels (11, 17).
  • At least one extension piece each (11.4, 17.4) are provided, through which the metal strip (1) can be passed, which respectively connect to the transitions (11.2, 17.2) of the first and third vessels (11, 17) or respectively to the first and third vessels (11, 17 ) are directly connected, at least partially open into the respective downstream vessel (17, 12) in the running direction of the metal strip (1), means that the extension piece (11.4) at least partially flows into the melt (17.1) in the third vessel (17) and the Extension piece (17.4) is immersed at least in sections in the melt (12.1) in the second vessel (12) in order to prevent the metal strip (1) from coming into contact with oxygen between the vessels (17, 12).
  • figure 6 shows in contrast to figure 4 a device (10) according to a fifth embodiment of the invention, wherein at least one extension piece (11.4) is provided, through which the metal strip (1) can be passed, which is connected to the transition (11.2) of the first vessel (11) or to the first vessel ( 11) is directly connected, opens out at least in sections in the second vessel (12) in such a way that the extension piece (11.4) dips at least in sections into the melt (12.1) in the second vessel (12) in order to prevent oxygen contact of the metal strip (1) between the vessels (11, 12) to avoid.
  • at least one heating means (18) is provided, which is arranged in particular in the running direction of the metal strip (1) between the first and second vessel (11, 12), in particular in and/or on the extension piece (11.4).
  • At least one heating means (18), preferably at least two heating means (18), which are each arranged essentially parallel to the surface of the metal strip (18) and can be designed in particular as inductive heating means (18), can be a heat treatment on the with a first layer and/or a further layer of coated metal strip (1) in order to advantageously form a stable layer or intermediate layer on the metal strip (1).
  • the heat treatment leads to a substance flow or substance diffusion as a function of temperature and time, in particular iron diffuses from the steel strip (1) into the coated layer and stabilizes it.
  • figure 7 shows three micrographs of three differently coated steel strips (1).
  • a steel strip is coated in a conventional hot-dip coating system with a layer of an aluminum alloy, more precisely from an aluminum melt with approx. 10% by weight silicon, an approx. 4 ⁇ m thick alloy layer (1.2) is formed on the steel substrate (1.1) and above
  • the alloy layer (1.2) forms a cover layer (1.3) made of aluminum and embedded FeSi needles.
  • the coating is due to the relative thin alloy layer (1.2) sufficiently ductile and can be subjected to complex forming processes without damage. The corrosion protection is less pronounced in comparison to a coating/top layer that essentially contains pure aluminum, see upper micrograph.
  • a hot-dip coated metal strip (1) preferably steel strip
  • a melt (11.1) made of an aluminum alloy with about 10% by weight silicon and im second vessel (12) a melt (12.1) of essentially pure aluminum are provided.
  • the steel strip (1) coated with at least two chemically different layers due to the relatively thin alloy layer (1.2) can be formed complex and due to the essentially pure aluminum top layer (1.3) has a high level of corrosion protection.
  • the invention is not limited to the embodiments shown, rather the individual features can be combined with one another as desired.
  • Zinc or different zinc alloys can also be used as melts, in particular zinc alloys with different contents of magnesium and/or aluminum and/or nickel.
  • the second vessel (12) preferably corresponds to a conventional hot-dip coating pot.
  • the respective vessels (11, 12, 17) are correspondingly equipped with coating materials (B1, B2, B3), in particular during operation.
  • the melts (11.1, 12.1, 17.1) in the vessels (11, 12, 17) can be heated at different temperatures, with the first melt (11.1) having a significantly higher temperature level in comparison to the second and/or third melt (12.1, 17.1), the difference being particularly preferably at least 10 K, preferably at least 17 K is at least 24 K.
  • the vessel (11) for the first melt (11.1) can also be dimensioned smaller than the vessels (12, 17) for the second and/or third melt (12.1, 17.1), the volume of the first melt (11.1) being smaller than that of the
  • the volume of the second and/or third melt (12.1, 17.1) can be at least 1/2, in particular at least 1/3, preferably at least 1/5 less, in particular in order to reduce slag formation overall.
  • Different atmospheres can also be set, for example different dew points, in particular in the trunk (13) and/or in the transition areas (11.2, 17.2), in particular also in the extension pieces (11.4, 17.4).

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  • Chemical & Material Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Engineering & Computer Science (AREA)
  • Materials Engineering (AREA)
  • Mechanical Engineering (AREA)
  • Metallurgy (AREA)
  • Organic Chemistry (AREA)
  • Coating With Molten Metal (AREA)

Claims (19)

  1. Dispositif (10) pour le revêtement par immersion en masse fondue d'une bande métallique (1) avec au moins deux couches, avec un four continu pour le passage et le chauffage de la bande métallique (1), avec un premier récipient (11) rempli d'une masse fondue (11.1) agencé après le four continu dans la direction de déplacement de la bande métallique (1), et avec au moins un deuxième récipient (12) rempli d'une masse fondue (12.1), avec une trompe (13) agencée entre le four continu et le premier récipient (11) pour le passage et l'introduction de la bande métallique (1) dans la masse fondue (11.1) dans le premier récipient (11), avec une transition (11.2) agencée entre les récipients (11, 12) pour le passage de la bande métallique (1), avec au moins un rouleau de renvoi (15) agencé dans le deuxième récipient (12) pour le renvoi et l'évacuation de la bande métallique (1) hors du deuxième récipient (12),
    caractérisé en ce que
    au moins un inducteur (14) est agencé sur la transition (11.2) et dans lequel au moins un moyen de chauffage (18) est prévu, lequel est agencé dans la direction de déplacement de la bande métallique (1) entre le premier et le deuxième récipient (11, 12).
  2. Dispositif selon la revendication 1, dans lequel au moins deux inducteurs (14) sont agencés chacun essentiellement parallèlement à la surface de la bande métallique (1).
  3. Dispositif selon l'une quelconque des revendications précédentes, dans lequel le ou les inducteurs (14) sont encastrés.
  4. Dispositif selon l'une quelconque des revendications précédentes, dans lequel la transition (11.2) est reliée au premier récipient (11).
  5. Dispositif selon l'une quelconque des revendications ci-dessus, dans lequel la transition (11.2) débouche au moins par sections dans le deuxième récipient (12).
  6. Dispositif selon l'une quelconque des revendications précédentes, dans lequel le premier récipient (11) est agencé au moins par sections dans le deuxième récipient (12).
  7. Dispositif selon l'une quelconque des revendications précédentes, dans lequel le premier récipient (11) est agencé dans le deuxième récipient (12) de telle sorte que le niveau de la masse fondue (11.1) dans le premier récipient (11) correspond au niveau de la masse fondue (12.1) dans le deuxième récipient (12).
  8. Dispositif selon l'une quelconque des revendications précédentes, dans lequel la transition (11.2) est réalisée perpendiculairement ou angulairement par rapport à l'horizontale.
  9. Dispositif selon l'une quelconque des revendications précédentes, dans lequel au moins une pièce de prolongement (11.4) est prévue, à travers laquelle peut passer la bande métallique (1), qui est reliée directement à la transition (11.2) du premier récipient (11) ou au premier récipient (11), dans lequel la pièce de prolongement (11.4) débouche en particulier au moins par sections dans le deuxième récipient (12).
  10. Dispositif selon l'une quelconque des revendications 1 à 4 ou 8, dans lequel au moins un troisième récipient (17) rempli d'une masse fondue (17.1) est prévu, lequel est agencé en particulier dans la direction de déplacement de la bande métallique (1) entre le premier et le deuxième récipient (11, 12), en particulier le troisième récipient (17) présente une transition (17.2) et/ou est relié à une transition (17.2), dans lequel au moins un inducteur (14) est notamment agencé sur la transition (17.2).
  11. Dispositif selon l'une quelconque des revendications précédentes, dans lequel au moins un moyen de chauffage (18) est prévu, lequel est agencé en particulier dans la direction de déplacement de la bande métallique (1) entre le troisième et le deuxième récipient (17, 12).
  12. Dispositif selon l'une quelconque des revendications 10 ou 11, dans lequel au moins une pièce de prolongement (11.4) est prévue, à travers laquelle peut passer la bande métallique (1), laquelle est reliée directement à la transition (11.2) du premier récipient (11) ou au premier récipient (11), dans lequel la pièce de prolongement (11.4) débouche en particulier au moins par sections dans le troisième récipient (17), et dans lequel au moins une pièce de prolongement (17.4) est prévue, à travers laquelle peut passer la bande métallique (1), laquelle est reliée directement à la transition (17.2) du troisième récipient (17) ou au troisième récipient (17), dans lequel la pièce de prolongement (17.4) débouche en particulier au moins par sections dans le deuxième récipient (12).
  13. Dispositif selon l'une quelconque des revendications 11 ou 12, dans lequel le moyen de chauffage (18) est agencé dans et/ou sur la pièce de prolongement (11.4, 17.4).
  14. Dispositif selon l'une quelconque des revendications précédentes, dans lequel au moins deux rouleaux de renvoi (15) sont agencés dans le deuxième récipient (12).
  15. Procédé de revêtement par immersion en masse fondue d'une bande métallique (1) avec au moins deux couches, en particulier avec un dispositif (10) selon l'une quelconque des revendications précitées, dans lequel la bande métallique (1) est passée et chauffée dans un four continu, la bande métallique (1) chauffée est passée à travers une trompe (13) agencée après le four continu dans la direction de déplacement de la bande métallique (1) et est introduite dans un premier récipient (11) rempli d'une masse fondue (11.1) et la bande métallique (1) est revêtue d'une première couche, la bande métallique (1) revêtue d'une première couche passe à travers une transition (11.2) et est introduite dans au moins un deuxième récipient (12) rempli d'une masse fondue (12.1) et est revêtue d'une deuxième couche, la bande métallique (1) revêtue de la deuxième couche est renvoyée par au moins un rouleau de renvoi (15) et est évacuée de la masse fondue (12.1) dans le deuxième récipient (12),
    caractérisé en ce que
    au moins un inducteur (14) est agencé sur la transition (11.2), lequel ferme la transition (11.2), de telle sorte qu'une sortie de la masse fondue (11.1) hors du premier récipient (11) est empêchée par la transition (11.2), et dans lequel la bande métallique (1) revêtue de la première couche est chauffée avant d'être revêtue de la deuxième couche.
  16. Procédé selon la revendication 15, dans lequel la masse fondue (11.1) dans le premier récipient (11) est chimiquement différente de la masse fondue (12.1) dans le deuxième récipient (12).
  17. Procédé selon la revendication 15 ou 16, dans lequel la bande métallique (1) est introduite perpendiculairement dans le premier et/ou le deuxième récipient (11, 12).
  18. Procédé selon l'une quelconque des revendications 15 à 17, dans lequel la bande métallique (1) revêtue d'une première couche passe à travers une transition (11.2) et est introduite dans au moins un troisième récipient (17) rempli d'une masse fondue (17.1) et est revêtue d'une troisième couche avant d'être introduite dans au moins un deuxième récipient (12) rempli d'une masse fondue (12.1) et d'être revêtue d'une deuxième couche.
  19. Procédé selon l'une quelconque des revendications 15 à 18, dans lequel les masses fondues (11.1, 12.1, 17.1) présentent des températures de bain de masse fondue différentes et/ou des atmosphères identiques ou différentes peuvent être ajustées dans la trompe (13) et dans les transitions (11.2, 17.2) avant ou entre les récipients (11, 12, 17).
EP19168561.9A 2018-04-23 2019-04-11 Dispositif et procédé de revêtement par immersion à chaud d'une bande métallique avec au moins deux couches Active EP3561133B1 (fr)

Applications Claiming Priority (1)

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DE102018206185.8A DE102018206185A1 (de) 2018-04-23 2018-04-23 Vorrichtung und Verfahren zum Schmelztauchbeschichten eines Metallbandes mit mindestens zwei Schichten

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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE10306911A1 (de) * 2003-02-19 2004-09-02 Sms Demag Ag Vorrichtung zur Schmelztauchbeschichtung von Metallsträngen
DE10316138A1 (de) * 2003-04-09 2004-10-28 Sms Demag Ag Verfahren und Vorrichtung zur Schmeltauchbeschichtung eines Metallstranges
DE102009007100A1 (de) * 2009-02-02 2010-08-05 Thyssenkrupp Steel Europe Ag Stahlflachprodukt mit einem metallischen Überzug und Verfahren zu seiner Herstellung
DE102013101132A1 (de) 2013-02-05 2014-08-07 Thyssenkrupp Steel Europe Ag Verfahren zum Schmelztauchbeschichten von Metallband, insbesondere Stahlband
DE102013101131A1 (de) 2013-02-05 2014-08-07 Thyssenkrupp Steel Europe Ag Vorrichtung zum Schmelztauchbeschichten von Metallband
DE102013101134B3 (de) 2013-02-05 2014-05-08 Thyssenkrupp Steel Europe Ag Metallisches, durch Schmelztauchbeschichten oberflächenveredeltes Flacherzeugnis, vorzugsweise aus Stahl

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