EP3561133A1 - 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
EP3561133A1
EP3561133A1 EP19168561.9A EP19168561A EP3561133A1 EP 3561133 A1 EP3561133 A1 EP 3561133A1 EP 19168561 A EP19168561 A EP 19168561A EP 3561133 A1 EP3561133 A1 EP 3561133A1
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EP
European Patent Office
Prior art keywords
vessel
metal strip
melt
transition
layer
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.)
Granted
Application number
EP19168561.9A
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German (de)
English (en)
Other versions
EP3561133B1 (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
Original Assignee
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 and heating the metal strip, with a arranged in the direction of the metal strip behind the continuous furnace first filled with a melt vessel and at least one second filled with a melt vessel with a trunk arranged between the continuous furnace and the first vessel for passing and introducing the metal strip into the melt in the first vessel, with a passage arranged between the vessels for passing the metal strip, with at least one deflection roller arranged in the second vessel for deflecting and discharging the passage Metal band from the second vessel.
  • the invention relates to a method for hot dip coating a metal strip having at least two layers, wherein the metal strip is passed through and heated in a continuous furnace, the heated metal strip passed through a arranged in the direction of the metal strip behind the continuous furnace trunk and in a first filled with a melt And the metal strip is coated with a first layer, the metal layer coated with a first layer is passed through a transition and introduced into at least one second vessel filled with a melt and coated with a second layer which 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 of metal strips with two layers of chemically different composition are known from the prior art, cf. for example DE 10 2013 101 131 A1 . DE 10 2013 101 132 A1 and DE 10 2013 101 134 B3 ,
  • a leakage of the melt from the first vessel or a mixing of the melts can be realized substantially only with constant operation at high belt speeds.
  • operating fluctuations can be affected, for example, by fluctuating belt speeds or low belt speeds.
  • the invention is based on the object 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 or with which under operating conditions or at low belt speeds a reliable coating process can be ensured.
  • a device for hot dip coating of a metal strip with at least two layers with a continuous furnace for passing and heating the metal strip, with a arranged in the direction of the metal strip behind the continuous furnace first vessel filled with a melt and at least one second filled with a melt vessel, with a between the continuous furnace and the first vessel arranged trunk for passing and introducing the metal strip into the melt in the first vessel, with an arranged between the vessels transition for passing the metal strip, with at least one arranged in the second vessel pulley for deflecting and discharging the metal strip from the second vessel, wherein at the transition at least one electromagnetic means is arranged, is provided.
  • the inventors have found that by arranging at least one electromagnetic means, in particular at least one inductor at the transition closing the Transition or the output range of the transition can be effectively effected so that leakage of the melt 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 in particular connected to the vessel, is a metallic melt, for example, it consists of zinc or a zinc alloy or of 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, generate or generate by applying a current an alternating magnetic field, which essentially influences the melt in the transition in such a way that, contrary to gravity, the melt sinks effectively prevented.
  • the magnetic alternating field is preferably adjustable individually and to the respectively used or used metallic melt.
  • the electromagnetic means or the electromagnetic means are housed.
  • the one or more electromagnetic means may also be housed in particular media-tight, d. H. that operation of the electromagnetic means by immersion in a melt can take place without damage.
  • the transition opens at least in sections in the second vessel, in particular, the transition at least partially immersed in the melt in the second vessel. This can be ensured in particular that the metal strip passes through the two vessels without being exposed to the atmosphere or the environment, so that no contact can be made in particular with oxygen, which the surface of the metal strip, in particular the surface of the metal layer coated with the first layer would adversely affect.
  • the first vessel is arranged at least in sections in the second vessel. Due to the small installation space, it is also possible, for example, to retrofit existing, conventional melt-coating installations having at least one second vessel with a transition and at least one electromagnetic means arranged at the transition.
  • the first vessel may be arranged in the second vessel such that the level of the melt in the first vessel corresponds to the level of the melt in the second vessel.
  • the transition is performed 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, wherein in particular the extension piece at least partially opens into the second vessel.
  • the extension piece at least partially immersed in the melt in the second vessel.
  • At least a third vessel filled with a melt is provided, which is arranged in particular in the running direction 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 the transition at least one electromagnetic means is arranged.
  • This design allows the coating of a metal strip with at least three layers.
  • 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 vessels or between the first and third vessels and / or between the third and second vessels.
  • the provision of at least one heating means, preferably at least two heating means, which may each be arranged parallel to the surface of the metal strip a heat treatment may be carried out on the metal strip coated with a first layer and / or another layer to advantageously a stable layer or intermediate layer form the metal strip which is ready for a subsequent coating with another layer.
  • the heat treatment as a function of temperature and time leads to a flow of material or to a material diffusion, in particular iron from the steel strip in the coated layer can diffuse and stabilize it.
  • At least one extension piece is provided, through which the metal strip can be passed, which coincides with the transition of the first vessel or is directly connected to the first vessel, wherein in particular the extension piece at least partially opens in the third vessel, and wherein at least one extension piece is provided, through which the metal strip is passable, which directly connected to the transition of the third vessel or with the third vessel is, in particular, the extension piece opens at least partially in the second vessel.
  • the heating means is arranged in and / or on the extension piece.
  • the heating means is arranged in the extension piece on both sides substantially parallel to the surface of the metal strip and in particular designed as an inductive heating means.
  • induction By means of induction, the metal strip coated with a layer can be quickly and effectively heated or heated to a predefined temperature in order to be able to form a stable layer on the metal strip, in particular by means of a material flow / substance 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 deflected by the first deflection roller can at a vertical entry Metal band and deflection of the metal strip to be provided in about another 90 ° for discharging the metal strip from the second vessel in the second vessel.
  • this task can alternatively only be assumed by a 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 in a continuous furnace and heated, passed through the heated metal strip through a arranged in the direction of the metal strip behind the continuous furnace trunk and in a first a vessel filled with a melt is introduced and the metal strip is coated with a first layer, the metal strip coated with a first layer is passed through a junction and into at least one second vessel filled with a melt is introduced and coated with a second layer, the metal layer coated with the second layer is deflected via 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 closes off the transition to prevent leakage of the melt from the first vessel through the transition.
  • the melt chemically differs in the first vessel from the melt in the second vessel.
  • the melt in the third vessel may also differ from the melts in the first and second vessels. If, for example, the melts are of the same type, in particular zinc or aluminum alloys, corresponding gradients in the individual layers of the coatings can be set or formed by individual alloy constituents which may or may not be present in the respective melts with different proportions.
  • 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 one 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 by a mass flow / substance 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 may have different melt bath temperatures.
  • This is particularly advantageous in terms of wettability and adhesion in the coating of high-alloy metals, preferably of high-alloy steels, since high-alloy metals, preferably high-alloy steels often have defects in the alloy layer in conventional coating, in particular at conventional melt bath temperature have. It has been shown that higher melt bath temperatures enhance or favor the formation of a closed alloy layer.
  • the first melt seen in the direction of passage can have a significantly higher temperature level than the actual melt, which is conventionally tempered and intended for the actual coating.
  • the first melt has a higher temperature compared to 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 to decrease.
  • the volume of the melt, in particular the first, higher-temperature melt selected smaller than the vessels for further melting so that the slag formation is lower overall.
  • identical or different atmospheres can be set.
  • different dew points can also be set.
  • FIG. 1 a schematic device is shown as known from the prior art.
  • the device is suitable for hot dip coating a metal strip (1), preferably a steel strip (1) with two layers, with a continuous furnace, not shown, for passing and heating the metal strip (1), with a arranged in the direction of the metal strip behind the continuous furnace first with a Melt (11.1) filled vessel (11) and at least one second with a melt (12.1) filled vessel (12), with a between the continuous furnace and the first vessel (11) arranged trunk (13) for passing and introducing the metal strip ( 1) in the melt (11.1) in the first vessel (11), with a between the vessels (11, 12) arranged transition (11.2) for passing the metal strip (1), with a in the second vessel (12) arranged deflection roller (15 ) for deflecting and discharging the metal strip (1) from the second vessel (12).
  • the metal strip (1) is passed through two vessels (11, 12) each filled with a melt (11.1, 12.1) and coated successively, wherein a separation of the respective melts (11.1, 12.1) with each other by a relatively simple cone-shaped transition (11.2 ) between the first vessel (11) and the second vessel (12) takes place such that during the coating operation the metal strip (1) passing through the transition (11.2) is operated at a sufficiently high belt speed, so that within the cone-shaped transition (11.2) Turbulence (11.3) in the melt (11.1) arise, which prevent leakage of the melt (11.1) from the transition (11.2) with a tapering in the direction of the exit cross-section in the second vessel (12) substantially.
  • additional stabilizing rollers (16) may be arranged, which stabilize in particular the metal strip (1) on exit from the melt (12.1) in the second vessel (12) and cause a smooth tape running, in particular in connection with above the second vessel respectively on both sides of the exiting metal strip (1) arranged scraper nozzles (19) for adjusting the layer thickness on the metal strip (1), preferably for setting a constant layer thickness.
  • FIG. 2 shows in contrast to FIG. 1 a device (10) according to a first embodiment of the invention with at least one arranged at the transition (11.2) of the first vessel (11) Electromagnetic means (14) to ensure a reliable coating process even in fluctuating operating conditions or at low belt speeds.
  • the electromagnetic means (14), in particular the at least two electromagnetic means (14) are each arranged substantially parallel to the surface of the metal strip (1).
  • the means (14) outside the transition (11.2) are arranged or installed.
  • the transition (11.2) is cone-shaped and executed at an angle to the horizontal.
  • the transition (11.2) can be designed as a separate component and connected to the first vessel (11) or integrally and integrally formed with the first vessel (11).
  • the electromagnetic means (14) are housed media-tight, since they are in the melt (12.1) in the second vessel (12).
  • FIG. 3 shows in contrast to FIG. 2 a device (10) according to a second embodiment of the invention with a transition (11.2) which has a substantially constant longitudinal cross-section and is designed at an angle to the horizontal, in particular with substantially parallel to the surface of the metal strip (1) extending side parts, and in particular at least two electromagnetic means (14) arranged at the transition (11.2).
  • the electromagnetic means (14) outside the transition (11.2) are arranged or installed.
  • the transition (11.2) can be designed as a separate component and connected to the first vessel (11) or integrally and integrally formed with the first vessel (11).
  • the electromagnetic means (14) are housed media-tight, since they are in the melt (12.1) in the second vessel (12).
  • the enclosure is exemplified with (20).
  • FIG. 4 shows in contrast to FIG. 3 a device (10) according to a third embodiment according to the invention with a transition (11.2), which has a substantially constant cross-section in the longitudinal direction and is perpendicular or vertical to the horizontal, in particular with substantially parallel to the surface of the metal strip (1) extending side parts , And in particular at least two electromagnetic means (14) arranged at the transition (11.2).
  • the electromagnetic means (14) outside the transition (11.2) are arranged or installed.
  • the transition (11.2) can be designed as a separate component and connected to the first vessel (11) or integrally and integrally formed with the first vessel (11).
  • the electromagnetic means (14) may be housed.
  • the metal strip (1) passes perpendicularly through the first vessel (11) filled with a melt (11.1) and perpendicularly into the second vessel (12) filled with a melt (12.1), via a first deflection roller (15) for receiving the entering metal strip (1) and deflection by about 90 ° and a second guide roller (15) for receiving the first Deflection roller (15) deflected metal strip (1) and deflection of the metal strip (1) by approximately 90 ° for discharging the metal strip (1) out of the second vessel (12).
  • the transition (11.2) opens at least in sections in the second vessel (12). In other words, the transition (11.2) at least in sections, in particular the outlet-side area in the melt (12.1) in the second vessel (12), to avoid contact of the metal strip (1) with the oxygen in the atmosphere.
  • FIG. 5 shows in contrast to FIG. 4 a device (10) according to a fourth embodiment of the invention, wherein at least a third with a melt (17.1) filled vessel (17) is provided, which in particular in the running direction of the metal strip (1) 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), wherein at the transition (17.2) at least one electromagnetic means (14) is arranged.
  • the metal strip (1) is passed through in a continuous furnace, not shown, and heated.
  • the heated metal strip (1) is passed through a in the running direction of the metal strip (1) behind the continuous furnace trunk (13) and introduced into a first with a melt (11.1) filled vessel (11) or passed through and coated with a first layer ,
  • the coated with a first layer of metal strip (1) is passed through the transition (11.2) and introduced into a third with a melt (17.1) filled vessel (17) or passed through and coated with a third layer.
  • the metal strip (1) coated with a third layer is passed or 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 diverted via two deflecting rollers (15) arranged in the second vessel (12) and discharged from the melt (12.1) in the second vessel (12).
  • at least one extension piece (11.4, 17.4) are provided, through which the metal strip (1) are istleitbar, each with the transitions (11.2, 17.2) of the first and third vessel (11, 17) or in each case with the first and third vessel (11, 17) are directly connected, open at least in sections in the respective downstream in the direction of the metal strip (1) vessel (17, 12), means that the extension piece (11.4) at least partially into the melt (17.1) in the third vessel ( 17) and the extension piece (17.4) at least partially immersed in the melt (12.1) in the second vessel (12) to avoid oxygen contact of the metal strip (1) between the vessels (17, 12).
  • FIG. 6 shows in contrast to FIG. 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) is passable, which with the transition (11.2) of the first vessel (11) or with the first vessel ( 11), opens at least in sections in the second vessel (12) such that the extension piece (11.4) at least partially immersed in the melt (12.1) in the second vessel (12) to oxygen contact the metal strip (1) between the vessels (11, 12). Furthermore, 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) 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), each arranged essentially parallel to the surface of the metal strip (18) and in particular as inductive heating means (18), can be heat-treated on the first layer and / or a further layer of coated metal strip (1) are carried out in order to advantageously form a stable layer or intermediate layer on the metal strip (1).
  • the heat treatment as a function of temperature and time leads to a stream or to a substance diffusion, in particular diffuses iron from the steel strip (1) in the coated layer and stabilized.
  • FIG. 7 shows three micrographs of three different coated steel bands (1).
  • an aluminum alloy more specifically made of an aluminum melt with about 10 wt .-% silicon
  • the alloy layer (1.2) forms a covering layer (1.3) of aluminum and embedded FeSi needles.
  • the coating is due to the relatively thin alloy layer (1.2) sufficiently ductile and can be subjected to complex forming processes without damage.
  • the corrosion protection is less pronounced compared to a substantially pure aluminum-containing coating / covering layer, s. upper section.
  • an approximately 20 ⁇ m thick alloy layer (1.2) is formed on the steel substrate (1.1) and above the alloy layer (1.2) in the absence of silicon a cover layer (1.3) made of pure aluminum.
  • the coating is due to the relatively thick alloy layer (1.2) is very brittle and is not suitable for complex forming processes.
  • the coating / cover layer has excellent corrosion protection, s. medium cut.
  • a hot-dip-coated metal strip (1) preferably steel strip can be reliably implemented by the inventive device or by the inventive method, for example, in the first vessel (11) a melt (11.1) of an aluminum alloy with approximately 10 wt .-% silicon and im second vessel (12) is provided a melt (12.1) of substantially pure aluminum.
  • a melt (11.1) of an aluminum alloy with approximately 10 wt .-% silicon and im second vessel (12) is provided a melt (12.1) of substantially pure aluminum.
  • the aforementioned advantages can be combined, i. h., That a relatively thin alloy layer (1.2) with a thickness of about 4 microns and a cover layer (1.3) of pure aluminum without FeSi needles can form, the coated with at least two chemically different layers steel strip (1) due to relatively thin alloy layer (1.2) can be complex formed and due to the substantially pure aluminum cover layer (1.3) has a high corrosion protection.
  • the invention is not limited to the embodiments shown, but the individual features can be combined with each other. Also zinc or different zinc alloys can 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 fire-coating pot.
  • the respective vessels (11, 12, 17) are appropriately filled 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 have different temperatures, the first melt (11.1) having a significantly higher temperature level in comparison to the second and / or third melt (12.1, 17.1), wherein the difference is in particular at least 10 K, preferably at least 17 K, particularly preferably at least 24 K.
  • the vessel (11) for the first melt (11.1) may be smaller in size than the vessels (12, 17) of the second and / or third melt (12.1, 17.1), wherein the volume of the first melt (11.1) compared to Volume of the second and / or third melt (12.1, 17.1) by at least 1/2, in particular by at least 1/3, preferably by at least 1/5 may be lower, in particular to reduce total slag formation.
  • different atmospheres, in particular in the trunk (13) and / or in the transition areas (11.2, 17.2) in particular in the extension pieces (11.4, 17.4), for example, different dew points can be set.

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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)
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)

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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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Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE10316138A1 (de) * 2003-04-09 2004-10-28 Sms Demag Ag Verfahren und Vorrichtung zur Schmeltauchbeschichtung eines Metallstranges
DE102013101131A1 (de) * 2013-02-05 2014-08-07 Thyssenkrupp Steel Europe Ag Vorrichtung zum Schmelztauchbeschichten von Metallband

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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
DE102009007100A1 (de) * 2009-02-02 2010-08-05 Thyssenkrupp Steel Europe Ag Stahlflachprodukt mit einem metallischen Überzug und Verfahren zu seiner Herstellung
DE102013101134B3 (de) 2013-02-05 2014-05-08 Thyssenkrupp Steel Europe Ag Metallisches, durch Schmelztauchbeschichten oberflächenveredeltes Flacherzeugnis, vorzugsweise aus Stahl
DE102013101132A1 (de) 2013-02-05 2014-08-07 Thyssenkrupp Steel Europe Ag Verfahren zum Schmelztauchbeschichten von Metallband, insbesondere Stahlband

Patent Citations (2)

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Publication number Priority date Publication date Assignee Title
DE10316138A1 (de) * 2003-04-09 2004-10-28 Sms Demag Ag Verfahren und Vorrichtung zur Schmeltauchbeschichtung eines Metallstranges
DE102013101131A1 (de) * 2013-02-05 2014-08-07 Thyssenkrupp Steel Europe Ag Vorrichtung zum Schmelztauchbeschichten von Metallband

Non-Patent Citations (1)

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Title
JING LI ET AL: "The Rrsearch of Permanent Magnet Sealing Technology in Vertical Hot Galvanized Pot", PROCEEDINGS OF THE 2ND INTERNATIONAL CONFERENCE ON COMPUTER SCIENCE AND ELECTRONICS ENGINEERING (ICCSEE 2013), 1 January 2013 (2013-01-01), XP055609032, ISBN: 978-90-78-67761-1, DOI: 10.2991/iccsee.2013.751 *

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DE102018206185A1 (de) 2019-10-24

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