EP2776600B1 - Procédé et dispositif de revêtement au trempé d'un feuillard métallique avec un revêtement métallique - Google Patents

Procédé et dispositif de revêtement au trempé d'un feuillard métallique avec un revêtement métallique Download PDF

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Publication number
EP2776600B1
EP2776600B1 EP12780134.8A EP12780134A EP2776600B1 EP 2776600 B1 EP2776600 B1 EP 2776600B1 EP 12780134 A EP12780134 A EP 12780134A EP 2776600 B1 EP2776600 B1 EP 2776600B1
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EP
European Patent Office
Prior art keywords
metal strip
melt bath
nozzle
gas flow
slag
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.)
Not-in-force
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EP12780134.8A
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German (de)
English (en)
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EP2776600B8 (fr
EP2776600A1 (fr
Inventor
Christopher Gusek
Jörg SCHULTE
Marc Blumenau
Fred Jindra
Dirk Czupryna
Rudolf Schönenberg
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ThyssenKrupp Steel Europe AG
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ThyssenKrupp Steel Europe AG
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Publication of EP2776600A1 publication Critical patent/EP2776600A1/fr
Publication of EP2776600B1 publication Critical patent/EP2776600B1/fr
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Publication of EP2776600B8 publication Critical patent/EP2776600B8/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
    • C23C2/14—Removing excess of molten coatings; Controlling or regulating the coating thickness
    • 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
    • C23C2/50—Controlling or regulating the coating processes
    • C23C2/54—Controlling or regulating the coating processes of the mixing or stirring the bath
    • C23C2/544—Controlling or regulating the coating processes of the mixing or stirring the bath using moving mixing devices separate from the substrate, e.g. an impeller of blade
    • 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
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05C—APPARATUS FOR APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05C11/00—Component parts, details or accessories not specifically provided for in groups B05C1/00 - B05C9/00
    • B05C11/02—Apparatus for spreading or distributing liquids or other fluent materials already applied to a surface ; Controlling means therefor; Control of the thickness of a coating by spreading or distributing liquids or other fluent materials already applied to the coated surface
    • B05C11/06—Apparatus for spreading or distributing liquids or other fluent materials already applied to a surface ; Controlling means therefor; Control of the thickness of a coating by spreading or distributing liquids or other fluent materials already applied to the coated surface with a blast of gas or vapour
    • 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
    • C23C2/14—Removing excess of molten coatings; Controlling or regulating the coating thickness
    • C23C2/16—Removing excess of molten coatings; Controlling or regulating the coating thickness using fluids under pressure, e.g. air knives
    • 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
    • C23C2/14—Removing excess of molten coatings; Controlling or regulating the coating thickness
    • C23C2/16—Removing excess of molten coatings; Controlling or regulating the coating thickness using fluids under pressure, e.g. air knives
    • C23C2/18—Removing excess of molten coatings from elongated material
    • 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
    • C23C2/14—Removing excess of molten coatings; Controlling or regulating the coating thickness
    • C23C2/16—Removing excess of molten coatings; Controlling or regulating the coating thickness using fluids under pressure, e.g. air knives
    • C23C2/18—Removing excess of molten coatings from elongated material
    • C23C2/20—Strips; Plates
    • 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
    • C23C2/14—Removing excess of molten coatings; Controlling or regulating the coating thickness
    • C23C2/22—Removing excess of molten coatings; Controlling or regulating the coating thickness by rubbing, e.g. using knives, e.g. rubbing solids
    • 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
    • C23C2/325—Processes or devices for cleaning the bath
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05C—APPARATUS FOR APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05C11/00—Component parts, details or accessories not specifically provided for in groups B05C1/00 - B05C9/00
    • B05C11/02—Apparatus for spreading or distributing liquids or other fluent materials already applied to a surface ; Controlling means therefor; Control of the thickness of a coating by spreading or distributing liquids or other fluent materials already applied to the coated surface
    • B05C11/021—Apparatus for spreading or distributing liquids or other fluent materials already applied to the surface of an elongated body, e.g. a wire, a tube
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05D—PROCESSES FOR APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05D7/00—Processes, other than flocking, specially adapted for applying liquids or other fluent materials to particular surfaces or for applying particular liquids or other fluent materials
    • B05D7/14—Processes, other than flocking, specially adapted for applying liquids or other fluent materials to particular surfaces or for applying particular liquids or other fluent materials to metal, e.g. car bodies
    • B05D7/142—Auto-deposited coatings, i.e. autophoretic coatings

Definitions

  • the invention relates to a process for hot dip coating a metal strip with a metallic coating, in which the metal strip is passed in a continuous pass through a melt bath in which the thickness of the metallic coating present on its exit from the melt bath is adjusted by means of a scraping device, and wherein the slag present on the melt bath is expelled by means of a gas flow from the metal strip emerging from the melt bath.
  • the metal strips coated in this manner are hot or cold rolled steel strips.
  • the invention also relates to a device for hot dip coating a metal strip with a metallic coating, said device comprising a melt bath, a conveyor for continuously passing the metal strip through the melt bath, a stripping device for adjusting the thickness of the metal present on its exit from the molten bath on the metal strip Coating and at least one nozzle for discharging a gas stream, which expels existing slag on the melt bath of the emerging from the melt bath metal strip.
  • the continuous hot dipping refinement of the type specified initially represents an industrially established, economically and ecologically sensible process principle with which metallic flat products can be coated with a metallic coating, for example for the purpose of corrosion protection.
  • the hot dip finishing of a previously in-line recrystallization annealed metal strip with a Zn (hot dip galvanizing) or Al alloy coating (fire aluminizing) has a high importance for the production of starting material for sheet metal applications in the automotive, household appliance and mechanical engineering.
  • the annealed metal strip is passed through a melt bath consisting of a melt of the metal forming the respective coating or metal alloy forming the respective coating, and then deflected at least once within the melt bath via a roller system while being stabilized in its barrel until it comes out of the melt bath.
  • a melt bath consisting of a melt of the metal forming the respective coating or metal alloy forming the respective coating
  • deflected at least once within the melt bath via a roller system while being stabilized in its barrel until it comes out of the melt bath.
  • still molten coating material is stripped off after leaving the coating of wiping nozzles.
  • the stripping is usually done by blowing off by means of a gas stream.
  • purely mechanical stripping systems are also in use.
  • top slag is entrained by the metal strip emerging from the coating bath, the coating quality can be permanently impaired by the resulting imperfections. For example, so-called “smear” or the tape is damaged by indentations when the entrained slag adheres to subsequent roles and cakes. This sometimes creates significant costs due to rework and devaluation of the coated metal strip.
  • the discharge of larger lumps of top slag, so-called “bats”, can even lead to cost-intensive roller damage to the usually in-line downstream skin pass mill.
  • the plant operator is thus faced with the constant challenge of avoiding the entrainment of upper slag by the coated metal strip as far as possible.
  • mirror rollers are used in practice, which are positioned parallel to the width axis of the exiting metal strip and remove the slag coming into contact with them, which adheres to its surface, from the melt bath.
  • a motor-driven working material strips the top slag at a uniform speed of the coating surface.
  • motorized mirror rollers or motorized scrapers allows a continuous operation.
  • moving parts are in permanent contact with the coating bath. The industrial everyday life shows here that the aggressiveness of the molten coating bath a considerable Wear generated on such moving components. This applies to the coating of a steel strip with an Albaswholesome coating ("Feueralum ist").
  • a third way of preventing the slag from the metal strip emerging from the melt bath is by continuously circulating the coating bath and by establishing cooling zones, by means of which slag formation can be deliberately laid in surface areas of the melt bath which are remote from the strip run. The effectiveness of these measures can thereby be increased by directing the flows within the coating bath so that they act counter to the strip run. As a result, dissolved metal strip components are transported away from the metal strip. Procedures of this kind are in each case in the WO 2009/098362 A1 , of the WO 2009/098363 A1 , of the US 5,084,094 A1 , of the US Pat. No. 6,426,122 B1 and the US 6,177,140 B1 described.
  • the object of the invention was to provide a method and an apparatus for hot dip coating of metal strips, which allow with simple and inexpensive means to avoid the contact of slag with the emerging from the melt bath metal strip and to ensure an optimal surface quality.
  • the metal strip is passed continuously through a melt bath, then the thickness of the metallic coating present on the metal strip as it emerges from the melt bath set a scraper and thereby driven away on the melt bath slag by means of a gas stream of the emerging from the melt bath metal strip.
  • a gas stream extending over the width of the metal strip is directed onto the surface of the melt bath by means of at least one nozzle arranged closely adjacent to the metal strip for expelling the slag.
  • the nozzle for discharging the gas stream is now arranged closely adjacent to the metal strip and brings out a gas flow extending over the width of the metal strip and directed onto the surface of the melt bath.
  • Another advantage of the invention is that existing hot dip coating systems with can be retrofitted with a device according to the invention little effort and can be operated in accordance with the invention.
  • the invention can be used independently of the composition of the respective processed melt bath.
  • the gas flows are aligned so that a direct flow of the respective surface of the metal strip is avoided.
  • a direct flow the band position of the metal strip could be destabilized in the Abstreifdüse.
  • the gas flow discharged by the nozzle arranged according to the invention is optimally aligned in each case such that the gas flow is directed transversely to the conveying direction of the metal strip away from it.
  • the gas flow is preferably oriented in such a way that it is aligned substantially at right angles to the surface of the metal strip assigned to the respective nozzle.
  • the injection angle is in the range of 0-60 °, in particular 0-45 °. In such an orientation, it is ensured that the gas flow with a for driving away the slag sufficient impulse hits the surface area of the melt bath to be kept clear of slag.
  • the nozzle provided according to the invention for discharging the gas stream is preferably arranged as close as possible to the metal strip, wherein the distance between the nozzle and the strip in practice will each be chosen so that it also under the fluctuations of the strip layer occurring in practice no contact between the nozzle and the belt comes.
  • the distance between the nozzle and the metal strip is set in the range of 50 - 500 mm.
  • the nozzle provided for discharging a gas stream according to the invention in the immediate vicinity of the associated surface of the metal strip. Instead, a certain minimum distance must be maintained.
  • at least a partial flow of the gas stream discharged from the nozzle is preferably directed against the metal strip.
  • the gas flow is preferably oriented in such a way that the impact area lies on the surface of the melt bath in front of the metal strip, that is to say that the gas stream does not cover the surface of the metal strip. In this way, irregularities of the coating, which could be caused by a gas jet striking the metal strip in front of the scraping device, are avoided.
  • the gas stream destabilizes the proper band position of the metal strip on its conveying path through the stripping device.
  • the respective gas stream may be air, a gas inert with respect to the melt bath, or a gas mixture formed from air and a gas inert to the melt bath. It has been found that pressurization of the gas flow supplied to the nozzles in the range of 1 to 15 bar leads to good results under the conditions prevailing in practice.
  • the regulation and control of the gas flow can be done by the operator via adjustment of the horizontal, vertical and possibly axial alignment of the device according to the invention and the gas pressure.
  • the pressure set in each case must be large enough on the one hand to drive away the upper slag from the surface of the emerging metal strip.
  • the gas pressure should not exceed 15 bar, however, because at high pressures there is a risk that the surface of the coating bath is set by the impulse of the impinging gas in undesirable vibrations.
  • the "blown" upper slag can be skimmed off in a conventional manner at a sufficient distance from the exiting metal strip mechanically from the coating.
  • the metal strips processed in accordance with the invention are typically cold-rolled or hot-rolled steel strips.
  • melt baths all of the metallic melts that can be applied by hot dip coating can be used. These include, for example, zinc or zinc alloy melts as well as aluminum or aluminum alloy melts.
  • slot nozzles of known type are suitable. Also can be used as a nozzle acting as a slot nozzle slotted or perforated tube and a nozzle unit, which is occupied by two or more juxtaposed individual nozzles. Practical tests have shown that the invention can also be carried out with nozzle widths which are narrower than the width of the respective metal strip to be coated. Thus, in the case of a central arrangement with respect to the width of the metal strip, nozzles or nozzle arrangements are sufficient which extend over only 20% of the metal strip width. However, the nozzles or nozzle arrangements can also be wider than the metal strip to be coated. However, nozzle widths of more than 120% of the metal bandwidth would not make economic sense due to the increasing proportion of ineffective gas.
  • the pressure with which the gas flowing into the nozzle used according to the invention is applied is in the range from 1 to 15 bar.
  • a device 1 for hot dip coating a metal strip M which here for example to cold-rolled steel strip consisting of a corrosion-sensitive steel, comprises a melt bath 3 filled in a vessel 2 into which the metal strip M to be coated, previously brought to a sufficient immersion temperature in a known manner, is passed over a proboscis 4.
  • the metal strip M is deflected at a deflection roller 5 so that it emerges from the melt bath 3 in a vertically oriented conveying direction F.
  • the metal strip M emerging from the melt bath 3 passes through a stripping device 7 arranged at a specific distance above the surface 6 of the melt bath 3.
  • This comprises two stripping nozzles 8,9 formed as slit nozzles, one of which comprises a stripping gas stream AG1 on the one surface O1 of the metal strip M extending on one side between the longitudinal edges of the metal strip M, and the other of which directs a Abstreifgasstrom AG2 on the present on the opposite side of the metal strip M surface O2.
  • the metal strip M emerging from the melt bath 3 is aligned such that its center layer ML aligned centrally between the surfaces 01, 02 lies in a vertically oriented plane H.
  • a nozzle 10, 11 is arranged on each side of the metal strip M at a distance d of 200 mm, each one extending over the width B of the metal strip M extending gas flow G1, G2.
  • the nozzles 10, 11 may be designed as conventional slot nozzles.
  • air bars which consisted of a tube with 20 mm inner diameter, were drilled in the spaced at intervals of 25 mm twelve cylindrical nozzle orifices with a diameter of 2 mm. The gas was supplied centrally.
  • the air bar used was about 300 mm wide and centered to 1370 mm amounting width B of the metal strip M aligned.
  • the outlet openings of the nozzles 10,11 are aligned so that a larger partial flow G11, G21 of the respective gas flow G1, G2 with its central axis Ga1 each with respect to the perpendicular to the surface of the melt bath 3 injection angle ß of about 30 ° directed to the surface of the melt bath 3 and flows there from the associated surface O1, O2 of the metal strip M in a direction substantially normal to the relevant surface O1, O2 pioneering flow direction.
  • a smaller partial flow G12, G22 of the respective gas flow G1, G2 is directed against the associated surface 01, 02 of the metal strip.
  • the blowing angle ⁇ 'of this partial flow G12, G22 which is related to the perpendicular to the melt bath 3, is selected such that the boundary of the impact area X assigned to the metal strip M strikes the surface 6 of the melt bath 3 in the respective gas flow G1, G2 , at a close distance from the Metal band M ends.
  • the provided with the metallic coating surfaces 01,02 of the metal strip M are not affected in this way by the associated gas flow G1, G2.
  • the nozzles 10,11 are set so that they do not deploy in the direction of the metal strip M directed streams G12, G22.
  • the nozzles 10, 11 are set in such a manner that they do not dispense any partial flows G11, G21 directed away from the metal strip M.
  • the gas streams G1, G2 drive the slag S present on the melt bath 3 in a direction oriented transversely to the metal strip M from the metal strip M. away, so that they each collect in an uncritical for the metal strip M, sufficiently spaced area B1, B2 and from there mechanically, that can be removed manually or by means of a suitable, motor-driven device from the surface 6 of the melt bath 3.
  • a N 2 gas flow was blown by means of two arranged in the manner of the nozzles 10,11 air bar between the melt bath and stripping nozzles at a large industrial hot dip coating plant during the fire aluminizing.
  • the coating bath contained 9.5 wt .-% Si, 2.5 wt .-% Fe and balance Al and traces of other elements and unavoidable impurities.
  • the speed of the metal strip emerging from the melt bath was 38 m / min with a coating layer to be applied of min. 75 g / m 2 per side of the metal strip M.
  • Table 1 shows, for a slit nozzle arranged below the wiping nozzles in accordance with the invention, that this result of the result was not given if no gas flow was applied or if the boundary conditions given in accordance with the invention were abandoned.

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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 (14)

  1. Procédé d'enduction par immersion à chaud d'un feuillard métallique (M) avec un revêtement métallique,
    - selon lequel le feuillard métallique (M) est acheminé en passe continue à travers un bain de fusion (3),
    - selon lequel l'épaisseur du revêtement métallique présent sur le feuillard métallique (M) lors de sa sortie du bain de fusion (3) est réglée au moyen d'un dispositif racleur (7), et
    - selon lequel la scorie (S) présente sur le bain de fusion (3) est éloignée du feuillard métallique (M) qui sort du bain de fusion (3) au moyen d'un flux de gaz (G1, G2),
    caractérisé en ce que
    pour éloigner la scorie (S) du feuillard métallique (M), un flux de gaz (G1, G2) qui s'étend sur la largeur (B) du feuillard métallique (M) est dirigé sur la surface (6) du bain de fusion (3) au moyen d'au moins une buse (10, 11) disposée à une distance (d) de 50 à 500 mm de la surface (6) du feuillard métallique (M) qui lui est associée, de sorte que le flux de gaz (G1, G2) éloigne la scorie (S) présente sur le bain de fusion (3) du feuillard métallique (M) dans une direction orientée transversalement par rapport au feuillard métallique (M).
  2. Procédé selon la revendication 1, caractérisé en ce que le flux de gaz (G1, G2) est débité dans une direction transversale à la direction de transport (F) du feuillard métallique (M) s'éloignant de celui-ci.
  3. Procédé selon la revendication 2, caractérisé en ce que l'angle d'insufflation (β) sous lequel le flux de gaz (G1, G2) arrive sur la surface (6) du bain de fusion (3) est compris dans la plage de 0 à 60°.
  4. Procédé selon la revendication 1, caractérisé en ce qu'au moins un flux partiel (G11-G22) du flux de gaz (G1, G2) est dirigé contre le feuillard métallique (M) .
  5. Procédé selon la revendication 4, caractérisé en ce que la zone d'impact (X) du flux de gaz (G1, G2) sur la surface (6) du bain de fusion (3) se trouve avant le feuillard métallique (M).
  6. Procédé selon l'une des revendications précédentes, caractérisé en ce que la buse (10, 11) s'étend sur au moins 20 % de la largeur (B) du feuillard métallique (M).
  7. Procédé selon l'une des revendications précédentes, caractérisé en ce que le flux de gaz (G1, G2) correspondant se compose d'air, d'un gaz inerte par rapport au bain de fusion (3) ou d'un mélange gazeux formé d'air et d'un gaz inerte par rapport au bain de fusion (3).
  8. Procédé selon l'une des revendications précédentes, caractérisé en ce que la scorie (S) éloignée au moyen du flux de gaz correspondant (G1, G2) est retirée du bain de fusion (3) à l'aide d'un dispositif à entraînement mécanique.
  9. Dispositif d'enduction par immersion à chaud d'un feuillard métallique (M) avec un revêtement métallique,
    - comprenant un bain de fusion (3),
    - comprenant un dispositif de transport destiné à faire passer le feuillard métallique (M) en continu à travers le bain de fusion (3),
    - comprenant un dispositif racleur (7) destiné à régler l'épaisseur du revêtement métallique présent sur le feuillard métallique (M) lors de sa sortie du bain de fusion (3),
    et
    - comprenant au moins une buse (10, 11) destinée à débiter un flux de gaz (G1, G2) qui éloigne la scorie (S) présente sur le bain de fusion (3) du feuillard métallique (M) qui sort du bain de fusion (3),
    caractérisé en ce que,
    pour débiter le flux de gaz (G1, G2), la buse (10, 11)est disposée à une distance (d) de 50 à 500 mm de la surface (6) du feuillard métallique (M) qui lui est associée et débite un flux de gaz (G1, G2) qui s'étend sur la largeur (B) du feuillard métallique (M) et qui est dirigé sur la surface (6) du bain de fusion (3), de sorte que le flux de gaz (G1, G2) éloigne la scorie (S) présente sur le bain de fusion (3) du feuillard métallique (M) dans une direction orientée transversalement par rapport au feuillard métallique (M).
  10. Dispositif selon la revendication 9, caractérisé en ce qu'une buse (10, 11) destinée à éloigner la scorie (S) est associée à chaque surface (O1, 02) du feuillard métallique (M).
  11. Dispositif selon l'une des revendications 9 ou 10, caractérisé en ce que la buse (10, 11) est une buse à fente ou un tube fendu.
  12. Dispositif selon l'une des revendications 9 ou 10, caractérisé en ce que la buse (10, 11) est formée par une barre à buses dans laquelle sont prévues plusieurs ouvertures de buse disposées de manière espacée les unes par rapport aux autres.
  13. Dispositif selon la revendication 11 ou 12, caractérisé en ce que la buse (10, 11) est respectivement disposée de manière centrée par rapport à la largeur (B) du feuillard métallique (M) qui sort du bain de fusion (3).
  14. Dispositif selon l'une des revendications 9 à 13, caractérisé en ce que la buse s'étend respectivement sur au moins 20 % de la largeur du feuillard métallique (M).
EP12780134.8A 2011-11-11 2012-10-11 Procédé et dispositif de revêtement au trempé d'un feuillard métallique avec un revêtement métallique Not-in-force EP2776600B8 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE102011118197A DE102011118197B3 (de) 2011-11-11 2011-11-11 Verfahren und Vorrichtung zum Schmelztauchbeschichten eines Metallbands mit einem metallischen Überzug
PCT/EP2012/070180 WO2013068196A1 (fr) 2011-11-11 2012-10-11 Procédé et dispositif de revêtement au trempé d'un feuillard métallique avec un revêtement métallique

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EP2776600A1 EP2776600A1 (fr) 2014-09-17
EP2776600B1 true EP2776600B1 (fr) 2018-08-29
EP2776600B8 EP2776600B8 (fr) 2018-10-17

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EP (1) EP2776600B8 (fr)
JP (1) JP6231485B2 (fr)
KR (1) KR101979399B1 (fr)
CN (1) CN103998641B (fr)
DE (1) DE102011118197B3 (fr)
ES (1) ES2697673T3 (fr)
WO (1) WO2013068196A1 (fr)

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US10011897B2 (en) 2018-07-03
US20150140225A1 (en) 2015-05-21
JP2014532814A (ja) 2014-12-08
WO2013068196A1 (fr) 2013-05-16
DE102011118197B3 (de) 2013-05-08
CN103998641A (zh) 2014-08-20
KR20140101764A (ko) 2014-08-20
JP6231485B2 (ja) 2017-11-15
ES2697673T3 (es) 2019-01-25
EP2776600B8 (fr) 2018-10-17
CN103998641B (zh) 2017-05-24
EP2776600A1 (fr) 2014-09-17
KR101979399B1 (ko) 2019-05-16

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