EP2826887B1 - Method for applying an aqueous treatment solution to the surface of a moving steel strip - Google Patents

Method for applying an aqueous treatment solution to the surface of a moving steel strip Download PDF

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Publication number
EP2826887B1
EP2826887B1 EP14161660.7A EP14161660A EP2826887B1 EP 2826887 B1 EP2826887 B1 EP 2826887B1 EP 14161660 A EP14161660 A EP 14161660A EP 2826887 B1 EP2826887 B1 EP 2826887B1
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EP
European Patent Office
Prior art keywords
steel strip
treatment solution
strip
aqueous
solution
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Application number
EP14161660.7A
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German (de)
French (fr)
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EP2826887A1 (en
Inventor
Andrea Dr. Marmann
Michael Wild
Paul Michels
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ThyssenKrupp Rasselstein GmbH
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ThyssenKrupp Rasselstein GmbH
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    • 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
    • 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
    • C23C22/00—Chemical surface treatment of metallic material by reaction of the surface with a reactive liquid, leaving reaction products of surface material in the coating, e.g. conversion coatings, passivation of metals
    • 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
    • B05C11/023—Apparatus for spreading or distributing liquids or other fluent materials already applied to a surface
    • B05C11/025—Apparatus for spreading or distributing liquids or other fluent materials already applied to a surface with an essentially cylindrical body, e.g. roll or rod
    • 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
    • B05D1/00—Processes for applying liquids or other fluent materials
    • B05D1/40—Distributing applied liquids or other fluent materials by members moving relatively to surface
    • 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
    • B05D3/00—Pretreatment of surfaces to which liquids or other fluent materials are to be applied; After-treatment of applied coatings, e.g. intermediate treating of an applied coating preparatory to subsequent applications of liquids or other fluent materials
    • B05D3/002—Pretreatement
    • 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
    • B05D3/00—Pretreatment of surfaces to which liquids or other fluent materials are to be applied; After-treatment of applied coatings, e.g. intermediate treating of an applied coating preparatory to subsequent applications of liquids or other fluent materials
    • B05D3/04—Pretreatment of surfaces to which liquids or other fluent materials are to be applied; After-treatment of applied coatings, e.g. intermediate treating of an applied coating preparatory to subsequent applications of liquids or other fluent materials by exposure to gases
    • B05D3/0466—Pretreatment of surfaces to which liquids or other fluent materials are to be applied; After-treatment of applied coatings, e.g. intermediate treating of an applied coating preparatory to subsequent applications of liquids or other fluent materials by exposure to gases the gas being a non-reacting gas
    • 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
    • B05D3/00—Pretreatment of surfaces to which liquids or other fluent materials are to be applied; After-treatment of applied coatings, e.g. intermediate treating of an applied coating preparatory to subsequent applications of liquids or other fluent materials
    • B05D3/12—Pretreatment of surfaces to which liquids or other fluent materials are to be applied; After-treatment of applied coatings, e.g. intermediate treating of an applied coating preparatory to subsequent applications of liquids or other fluent materials by mechanical means
    • 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
    • C23C22/00—Chemical surface treatment of metallic material by reaction of the surface with a reactive liquid, leaving reaction products of surface material in the coating, e.g. conversion coatings, passivation of metals
    • C23C22/73—Chemical surface treatment of metallic material by reaction of the surface with a reactive liquid, leaving reaction products of surface material in the coating, e.g. conversion coatings, passivation of metals characterised by the process
    • C23C22/76—Applying the liquid by spraying
    • 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
    • B05D1/00—Processes for applying liquids or other fluent materials
    • B05D1/02—Processes for applying liquids or other fluent materials performed by spraying
    • 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
    • B05D2202/00—Metallic substrate
    • B05D2202/10—Metallic substrate based on Fe
    • 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
    • B05D2252/00—Sheets
    • B05D2252/02—Sheets of indefinite length
    • 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
    • B05D3/00—Pretreatment of surfaces to which liquids or other fluent materials are to be applied; After-treatment of applied coatings, e.g. intermediate treating of an applied coating preparatory to subsequent applications of liquids or other fluent materials
    • B05D3/02—Pretreatment of surfaces to which liquids or other fluent materials are to be applied; After-treatment of applied coatings, e.g. intermediate treating of an applied coating preparatory to subsequent applications of liquids or other fluent materials by baking
    • B05D3/0218—Pretreatment, e.g. heating the substrate
    • 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
    • B05D3/00—Pretreatment of surfaces to which liquids or other fluent materials are to be applied; After-treatment of applied coatings, e.g. intermediate treating of an applied coating preparatory to subsequent applications of liquids or other fluent materials
    • B05D3/02—Pretreatment of surfaces to which liquids or other fluent materials are to be applied; After-treatment of applied coatings, e.g. intermediate treating of an applied coating preparatory to subsequent applications of liquids or other fluent materials by baking
    • B05D3/0254—After-treatment

Definitions

  • the invention relates to a method and an apparatus for discharging an aqueous processing solution onto the surface of a steel belt moving at a predetermined belt speed in a belt running direction.
  • the surface-active substance is sprayed on at least one tube which is arranged at a distance from the coated steel strip surface and has at least one bore through which the aqueous solution of the surface-active substance is sprayed onto the or each metal-coated surface of the steel strip.
  • the excess portion of the solution is squeezed off the surface by means of squeezing rollers.
  • the wet film of the surfactant remaining on the coated steel belt surface is finally dried so that a dry, thin film of the surfactant with a coverage of between 2 and 10 mg / m 2 remains on the metal coated surface of the steel belt.
  • Another method for treating a metal strip provided with a steel strip, in particular a tinplate strip, with a post-treatment agent is from DE 10 2012 102 082 B3 known.
  • an aqueous aftertreatment solution is sprayed onto the metal-coated surface of the steel strip by a spray process.
  • spraying the aqueous solution of Aftertreatment agent by a spray process is also the application of the aftertreatment agent by a dipping process into consideration, in which the steel strip is passed through a tank filled with the liquid aftertreatment agent.
  • both the conventional spraying methods and the known immersing methods have the disadvantage that large amounts of the aqueous processing solution are required and that the excess portion of the processing solution, which is squeezed from the surface of the steel strip, for example, by means of squeezing rollers, collected in collecting tanks and sent for reprocessing must become.
  • Reprocessing a treatment solution that has once been applied to a metal-coated surface of a steel strip proves to be costly and expensive because the treatment solution can be contaminated by application to the steel strip surface, for example, metal ions from the metal coating of the steel strip.
  • application of an aqueous treatment solution on a tinplate surface leads to contamination of the treatment solution with tin ions from the tin coating.
  • a further object of the invention is to provide a method for applying an aqueous treatment solution to the surface of a moving steel strip, with which the treatment solution can be applied as fresh as possible after its application to the steel strip surface to avoid aging effects.
  • the application process should also be feasible at high belt speeds of the moving steel strip.
  • an aqueous treatment solution is applied to the surface of a steel belt moving at a predetermined belt speed in a belt running direction by applying the aqueous treatment solution to one or both surfaces of the moving steel belt with a rotary sprayer having a plurality of spray rotors juxtaposed transversely to the belt running direction to which the aqueous processing solution is supplied and which are rotated by a drive to spray the aqueous processing solution in the form of a fine spray jet on the or each surface of the steel strip by centrifugal force and form a wet film of the aqueous solution there.
  • the moving steel strip is dried with a gas stream and cleaned.
  • the smoothing rollers are expediently arranged with respect to the steel strip surface (s) such that they exert little or no pressure on the wet film of the aqueous treatment solution and therefore no or only a minimal proportion of the applied treatment solution from the steel strip surface squeezing off.
  • the sprayed-on wet film is evened out, it is dried so that a dry coating of the treatment substance remains on the treated steel strip or surfaces.
  • the dry coverage of the treatment solution after drying is between 1 and 50 mg / m 2 .
  • the gas stream with which the moving steel strip is cleaned and dried before applying the aqueous treatment solution is expediently provided by an air knife and inflated as a laminar flow of hot air onto the surface of the moving steel strip. As a result, disruptive foreign particles are blown off the steel strip surface and the steel strip surface is dried.
  • the amount of the aqueous treatment solution fed to the spray rotors of the rotary sprayer per unit time is expediently adapted to the belt speed.
  • the amount of treatment solution supplied to the spray rotors per unit time and based on the width of the steel strip and per side is preferably between 0.4 and 5.5 liters per minute and meter and is more preferably in a range between 1 and 3.5 liters per minute and meters, the belt speed is usually between 200 and 700 m / min.
  • the coating of the wet film of the treatment solution sprayed onto the or each surface side of the steel strip with the spray rotors is correspondingly in the preferred range of 2 to 8 ml / m 2 per side of the steel strip and preferably between 4 and 6 ml / m 2 and particularly preferably at ca. 5 ml / m 2 .
  • the smoothing rollers preferably comprise a pair of smoothing rollers with two driven and staggered arranged smoothing rollers.
  • the distance of the smoothing rollers to the steel strip surface is expediently adjustable and adaptable to the sprayed with the rotary sprayer amount (edition) of the wet film of the treatment solution.
  • the rotary sprayer 2 is expediently connected via a supply line to a storage container in which the aqueous treatment solution is stored.
  • the aqueous treatment solution may be supplied to the rotary sprayer from the container and via the supply line by means of a pump.
  • only fresh treatment solution is expediently stored in order to avoid aging problems.
  • the treatment solution stored in the storage container does not come into contact with a (possibly metal-coated) steel sheet before its application to the steel strip surface, which leads to contamination of the fresh treatment solution (for example by detachment of the metal ions from the metal coating) could.
  • the inventive method is characterized primarily by its resource-saving handling of the treatment solution to be applied and by its cost-effectiveness. It is, in contrast to the known application method, only the exact amount of the treatment solution sprayed onto the steel strip surface, without any excess of treatment solution would have to be blown off or squeezed again. As a result, it is no longer necessary to collect squeezed from the steel belt surface excesses of the treatment solution and supply a reprocessing. As a result, post-treated wastewater incurred in reprocessing processes can be avoided.
  • the application method according to the invention is suitable for applying different treatment solutions to moving steel strips.
  • passivation solutions or aftertreatment solutions for reducing the coefficient of friction can be applied to tinplate surfaces using the method according to the invention.
  • the method according to the invention can also be used in a corresponding manner for the application of other aqueous treatment solutions on tinplate surfaces or also on the surface of steel strips coated with other metallic coatings (such as coatings containing zinc or chromium) are.
  • the process of the present invention may also be used to apply aqueous processing solutions to uncoated steel belts, such as to apply an aqueous conversion coating to the surface of blackplate (hot or cold rolled, non-descaled and uncoated steel sheet).
  • FIG. 1 a device for carrying out the method according to the invention for applying an aqueous treatment solution to the surface of a moving steel strip is shown schematically.
  • the steel strip 1 is guided over a plurality of deflection rollers U and moves at a predetermined belt speed v in a strip running direction, which in FIG. 1 marked with an arrow.
  • the belt speed is regularly more than 200 m / min and up to 750 m / min.
  • the steel strip 1 can be a steel strip coated with a metal coating and cold-rolled, for example a tinplate strip or a galvanized steel strip. However, it may also be uncoated steel sheet, such as a black-plate tape.
  • the steel strip 1 is moved by a transport device not shown here with a predetermined belt speed v in a strip running direction and thereby guided over deflection rollers U.
  • a first drying device 4 to dry and clean the surfaces of the steel strip 1.
  • the first drying device 4 is formed for example by an "air knife", which is a laminar hot air flow to the surfaces of the with Belt speed v by moving steel strip 1 blows, thereby drying the steel strip surfaces and blow off disturbing foreign particles.
  • the first drying device 4 is followed by a rotary sprayer 2.
  • the rotary sprayer is in FIG. 2 shown in detail.
  • the rotary sprayer 2 has a plurality of transverse to the strip running direction next to each other and spaced spray nozzles 3.
  • the spray rotors 3 are connected to a reservoir 9 via a central supply line 6 and diverted branch lines 6a, 6b, 6c, etc. thereof.
  • the aqueous treatment solution is stored, which is to be applied to the steel strip surface.
  • the aqueous treatment solution is expediently pumped by means of a pump 8 into the supply line 6, from where it is conducted into the branch lines 6a, 6b, 6c, wherein each branch line is connected to one of the spray rotors 3.
  • a flow meter 11 is expediently provided in the supply line 6.
  • the aqueous treatment solution is fed to the spray rotors 3 of the rotary sprayer 2.
  • the spray rotors 3 each have a plate set in rotation by a drive. Due to the rotation of the plate of the spray rotors 3, the supplied aqueous treatment solution is conveyed outwards to the plate rim by the centrifugal force.
  • the rim of the plate is shaped such that the aqueous treatment solution in the form of fine droplets flies away from the rim of the rotating plate.
  • the droplet diameter depending on the viscosity and the surface tension of the treatment solution used, is usually between 30 and 70 micrometers.
  • the droplets of the treatment solution flowing away from the edge of the plate are sprayed in full around the rotating plate of the spray rotors 3.
  • the spray rotors 3 are arranged transversely to the strip running direction so that the spraying jets 12 adjacent spray rotors 3 overlap on the surface of the steel strip 1 in order to provide a uniform application of the aqueous treatment solution over the entire width B of the steel strip 1.
  • the amount of aqueous treatment solution supplied to the spray rotors 3 per unit of time is expediently adapted to the belt speed v, with which the steel belt 1 moves.
  • ⁇ t ⁇ B 1.0 to 3.5 liters per minute and meter.
  • the amount of the wet film of the treatment solution sprayed with the spray rotors 3 on the surface of the steel strip 1 is between 2 and 8 ml / m 2, and more preferably between 4 and 6 ml / m 2, and more preferably about 5 ml / m 2 .
  • the aqueous treatment solution can be sprayed by means of the rotary sprayer 2 either only on one side of the steel strip 1 or on both sides of the surfaces of the steel strip 1. Possibly.
  • 1 rotary sprayer 2 are arranged on both sides of the carried steel strip.
  • the steel strip 1 After applying the aqueous processing solution as a wet film on the or each surface of the steel strip 1, the steel strip 1 is performed between rotationally driven smoothing rollers 5a, 5b.
  • the smoothing rollers 5 serve to even out the applied wet film of the aqueous solution.
  • the staggered arrangement of the smoothing rollers 5a, 5b is shown in the figures.
  • the smoothing rollers 5a, 5b are arranged relative to one another in such a way that the connecting line of the axes of rotation of the smoothing rollers running parallel to one another and parallel to the steel belt surface has an angle of approximately 30 ° to 60 ° in cross section with the steel belt 1 passed through the two smoothing rollers ° and in particular of about 45 °.
  • the smoothing rollers used here exert no substantial contact pressure on the steel belt surface. As a result, no or only a very small proportion of the sprayed treatment solution is squeezed from the steel strip surface.
  • the smoothing roller pair 5 only leads to a homogenization of the wet film of the treatment solution over the entire surface of the steel strip. This ensures a constant application of a wet film of the treatment solution with homogeneous layer thickness over the entire surface of the steel strip and it is achieved that no excess treatment solution accumulates, which would have to be collected and recycled.
  • the steel strip 1 is passed through a second drying device 7.
  • the second drying device 7 may be a drying oven or an infrared or hot air dryer.
  • a uniform dry coating of the treatment solution remains on the or each surface of the steel strip 1, wherein the dry coating after drying is generally between 1 and 50 mg / m 2 and preferably between 2 and 30 mg / m 2 .
  • the dry coverage of the treatment solution is particularly preferably about 10 mg / m 2 .
  • the aqueous treatment solution may be, for example, a chromium-free, surface-active passivation solution, as described in US Pat DE 10 2005 045 034 A1 for chromium-free passivation of tinplate surfaces has been described.
  • the aqueous treatment solution may also be a chromium-free passivation solution for the passivation of tinplate, which contains water-soluble inorganic compounds of the elements zirconium and titanium or aluminum.
  • Such aqueous treatment solutions can be used in a two-pass passivation of tinplate, wherein in a first stage anodic oxidation of the tinplate surface is carried out and in a second stage, the application of the aqueous treatment solution on the tinplate surface, wherein the treatment solution water-soluble inorganic compounds of zirconium and / or titanium or aluminum.
  • the application of the aqueous treatment solution can be carried out with the method according to the invention.
  • the application of the aqueous treatment solution with the method according to the invention is then preceded by the first step of the anodic oxidation of the tinplate surface.
  • aqueous electrolyte eg., A soda solution
  • anodic oxidation of the tinplate surface forms a particularly inert oxidation layer on the tinned surface of the tinplate, which consists essentially of (inert) tetravalent tin oxide SnO 2 and protects the tinplate surface against natural growth of an oxide layer by atmospheric oxygen as well as against reactions with sulfur-containing materials.
  • a chromium-free aqueous aftertreatment agent which in particular contains titanium and / or zirconium, can therefore protect the tinned surface of the steel strip completely against corrosion and against discoloration of the surface by reaction of the tin with sulfur ,
  • a metallic or organic conversion coating on a black plate (uncoated, cold or hot rolled steel sheet) can be applied.
  • the method according to the invention is suitable, for example, for applying conversion coatings to blackplate which contain metallic constituents such as titanium, zirconium, manganese, zinc or even phosphorus or organic constituents such as polyacrylate or polycarboxylate.
  • Such conversion coatings provide good protection of the surface of the blackplate against corrosion, so that appropriately treated blackplate, for example, can be used as a substitute for steel sheet coated with a metallic anti-corrosion layer of chromium (such as ECCS, "electrolytic chromium coated steeel").

Description

Die Erfindung betrifft ein Verfahren und eine Vorrichtung zum Austragen einer wässrigen Behandlungslösung auf die Oberfläche eines sich mit einer vorgegebenen Bandgeschwindigkeit in einer Bandlaufrichtung bewegenden Stahlbands.The invention relates to a method and an apparatus for discharging an aqueous processing solution onto the surface of a steel belt moving at a predetermined belt speed in a belt running direction.

Aus dem Stand der Technik ist es bekannt, die beschichtete Oberfläche eines mit einer metallischen Korrosionsschutzschicht beschichteten Stahlblechs nach dem Auftragen der metallischen Beschichtung mit einem Nachbehandlungsmittel zu behandeln, um das beschichtete Stahlblech oxidationsbeständig zu machen und den Reibwert zu erniedrigen, damit das beschichtete Stahlblech bei der nachfolgenden Verarbeitung, beispielsweise bei der Herstellung von Verpackungsbehältern, besser verarbeitbar zu machen. Aus der DE 10 2005 045 034 A1 ist beispielsweise ein Verfahren zur Passivierung der Oberfläche von metallbeschichteten Stahlbändern, insbesondere von Weißblech (verzinntes Stahlblech) bekannt, wobei auf die Oberfläche des sich mit einer Bandgeschwindigkeit im Bereich von 100 m/min bis 600 m/min bewegenden Stahlbands eine wässrige Lösung einer oberflächenaktiven Substanz aufgespritzt wird. Die oberflächenaktive Substanz wird dabei über mindestens ein Rohr aufgesprüht, welches im Abstand zur beschichteten Stahlbandoberfläche angeordnet ist und mindestens eine Bohrung aufweist, durch welche die wässrige Lösung der oberflächenaktiven Substanz auf die oder jede metallbeschichtete Oberfläche des Stahlbands aufgesprüht wird. Nach dem Aufsprühen der wässrigen Lösung wird der überschüssige Anteil der Lösung mittels Quetschrollen von der Oberfläche abgequetscht. Der auf der beschichteten Stahlbandoberfläche verbleibende Nassfilm der oberflächenaktiven Substanz wird schließlich getrocknet, so dass ein trockener, dünner Film der oberflächenaktiven Substanz mit einer Auflage zwischen 2 und 10 mg/m2 auf der metallbeschichteten Oberfläche des Stahlbands verbleibt.From the prior art, it is known to treat the coated surface of a coated with a metallic corrosion protective layer steel sheet after applying the metallic coating with a post-treatment agent to make the coated steel sheet oxidation resistant and lower the coefficient of friction, so that the coated steel sheet in the subsequent processing, for example, in the manufacture of packaging containers to make it easier to process. From the DE 10 2005 045 034 A1 For example, there is known a method for passivating the surface of metal-coated steel strips, particularly tinplate (tinned steel plate), wherein an aqueous surfactant solution is applied to the surface of the steel strip moving at a belt speed in the range of 100 m / min to 600 m / min is sprayed on. The surface-active substance is sprayed on at least one tube which is arranged at a distance from the coated steel strip surface and has at least one bore through which the aqueous solution of the surface-active substance is sprayed onto the or each metal-coated surface of the steel strip. After spraying the aqueous solution, the excess portion of the solution is squeezed off the surface by means of squeezing rollers. The wet film of the surfactant remaining on the coated steel belt surface is finally dried so that a dry, thin film of the surfactant with a coverage of between 2 and 10 mg / m 2 remains on the metal coated surface of the steel belt.

Ein weiteres Verfahren zur Behandlung eines mit einer Metallbeschichtung versehenen Stahlbands, insbesondere eines Weißblech-Bands, mit einem Nachbehandlungsmittel ist aus der DE 10 2012 102 082 B3 bekannt. In diesem Verfahren wird eine wässrige Nachbehandlungslösung mittels eines Sprühverfahrens auf die metallbeschichtete Oberfläche des Stahlbands aufgesprüht. Als Alternative zum Aufsprühen der wässrigen Lösung des Nachbehandlungsmittels durch ein Sprühverfahren kommt auch die Applizierung des Nachbehandlungsmittels durch ein Tauchverfahren in Betracht, in dem das Stahlband durch einen mit dem flüssigen Nachbehandlungsmittel gefüllten Tank geleitet wird. Sowohl bei den bekannten Sprühverfahren als auch bei einem Tauchverfahren ist es zum Erzielung einer homogenen Verteilung des Behandlungsmittels über die gesamte Oberfläche des Stahlbands erforderlich, die wässrige Lösung des Behandlungsmittels im Überschuss auf die Oberfläche aufzubringen und den überschüssigen Anteil der Behandlungslösung beispielsweise mittels Abquetschrollen wieder zu entfernen. Deshalb weisen sowohl die herkömmlichen Sprühverfahren als auch die bekannten Tauchverfahren den Nachteil auf, das große Mengen der wässrigen Behandlungslösung benötigt werden und dass der überschüssige Teil der Behandlungslösung, welcher beispielsweise mittels Quetschrollen von der Oberfläche des Stahlbands abgequetscht wird, in Sammelbehältern gesammelt und einer Wiederaufbereitung zugeführt werden muss. Eine Wiederaufbereitung einer Behandlungslösung, die bereits einmal auf einer metallbeschichteten Oberfläche eines Stahlbands appliziert worden ist, erweist sich jedoch als aufwendig und teuer, weil die Behandlungslösung durch das Applizieren auf die Stahlbandoberfläche verunreinigt werden kann, beispielsweise durch Metallionen aus der Metallbeschichtung des Stahlbands. So führt beispielsweise eine Applizierung einer wässrigen Behandlungslösung auf einer Weißblechoberfläche zu einer Verunreinigung der Behandlungslösung mit Zinn-Ionen aus der Zinnbeschichtung.Another method for treating a metal strip provided with a steel strip, in particular a tinplate strip, with a post-treatment agent is from DE 10 2012 102 082 B3 known. In this process, an aqueous aftertreatment solution is sprayed onto the metal-coated surface of the steel strip by a spray process. As an alternative to spraying the aqueous solution of Aftertreatment agent by a spray process is also the application of the aftertreatment agent by a dipping process into consideration, in which the steel strip is passed through a tank filled with the liquid aftertreatment agent. Both in the known spraying method and in a dipping method, in order to obtain a homogeneous distribution of the treating agent over the entire surface of the steel strip, it is necessary to apply the aqueous solution of the treating agent in excess to the surface and to remove the excess portion of the treating solution, for example by means of squeezing rollers , Therefore, both the conventional spraying methods and the known immersing methods have the disadvantage that large amounts of the aqueous processing solution are required and that the excess portion of the processing solution, which is squeezed from the surface of the steel strip, for example, by means of squeezing rollers, collected in collecting tanks and sent for reprocessing must become. Reprocessing a treatment solution that has once been applied to a metal-coated surface of a steel strip, however, proves to be costly and expensive because the treatment solution can be contaminated by application to the steel strip surface, for example, metal ions from the metal coating of the steel strip. For example, application of an aqueous treatment solution on a tinplate surface leads to contamination of the treatment solution with tin ions from the tin coating.

Insbesondere in den bekannten Tauchverfahren kommt es ferner häufig zu einem ungleichmäßigen Auftrag der wässrigen Behandlungslösung auf die Oberfläche des Stahlbands. Dies macht sich vor allem dann bemerkbar, wenn das Stahlband mit einer hohen Bandgeschwindigkeit von beispielsweise mehr als 400 m/min durch ein Tauchbad mit der Behandlungslösung bewegt wird. Darüber hinaus besteht bei den Tauchverfahren das Problem einer Alterung der wässrigen Behandlungslösung, die in dem Tauchbad (Tank) bevorratet wird. Beim Durchleiten eines metallbeschichteten Stahlbands durch ein Tauchbad kommt es ebenfalls zu einer Kontamination der Behandlungslösung, insbesondere durch verschmutzte Oberflächen des Stahlbands und durch Ablösung von Metallionen aus dem Beschichtungsmaterial der Metallbeschichtung des Stahlbands. Das Problem der Alterung von wässrigen Behandlungslösungen in einem Tauchbad ergibt sich beispielsweise bei chromfreien Passivierungsmitteln, welche zur Passivierung von Weißblechoberflächen verwendet werden.In addition, in particular in the known dipping processes, there is frequently an uneven application of the aqueous treatment solution to the surface of the steel strip. This is especially noticeable when the steel strip is moved at a high belt speed of, for example, more than 400 m / min through a dipping bath with the treatment solution. Moreover, in the dipping processes, there is a problem of aging of the aqueous processing solution stored in the dipping tank. When a metal-coated steel strip is passed through an immersion bath, contamination of the treatment solution also occurs, in particular due to soiled surfaces of the steel strip and due to separation of metal ions from the coating material of the metal coating of the steel strip. The problem of the aging of aqueous treatment solutions in an immersion bath results, for example, in chromium-free passivating agents which are used for the passivation of tinplate surfaces.

Es besteht deshalb ein Bedürfnis für ein materialsparendes Verfahren zum Auftragen einer wässrigen Behandlungslösung auf die Oberfläche eines bewegten Stahlbands, mit dem ein gleichmäßiger Auftrag der Behandlungslösung auf die Stahlbandoberfläche ermöglicht wird. Eine Aufgabe der Erfindung besteht deshalb darin, ein Verfahren zum Auftragen einer wässrigen Behandlungslösung auf die Oberfläche eines bewegten Stahlbands aufzuzeigen, mit dem unter Verwendung möglichst geringer Mengen der Behandlungslösung eine gleichmäßige Applizierung der Behandlungslösung auf die Stahlbandoberfläche ermöglicht wird. Eine weitere Aufgabe der Erfindung besteht darin, ein Verfahren zum Auftragen einer wässrigen Behandlungslösung auf die Oberfläche eines bewegten Stahlbands bereit zu stellen, mit dem zur Vermeidung von Alterungseffekten die Behandlungslösung möglichst frisch nach ihrem Ansetzen auf die Stahlbandoberfläche appliziert werden kann. Das Applikationsverfahren soll dabei auch bei hohen Bandgeschwindigkeiten des bewegten Stahlbands durchführbar sein.There is therefore a need for a material-saving method for applying an aqueous treatment solution to the surface of a moving steel strip, which enables a uniform application of the treatment solution to the steel strip surface. It is therefore an object of the invention to provide a method for applying an aqueous treatment solution to the surface of a moving steel strip, which allows uniform application of the treatment solution to the steel strip surface using as small amounts of the treatment solution as possible. A further object of the invention is to provide a method for applying an aqueous treatment solution to the surface of a moving steel strip, with which the treatment solution can be applied as fresh as possible after its application to the steel strip surface to avoid aging effects. The application process should also be feasible at high belt speeds of the moving steel strip.

Diese Aufgaben werden mit einem Verfahren mit den Merkmalen des Anspruchs 1 gelöst. Zur Lösung der Aufgabe trägt ferner die Vorrichtung mit den Merkmalen des Anspruchs 14 bei.These objects are achieved by a method having the features of claim 1. To solve the problem also contributes to the device with the features of claim 14.

In dem erfindungsgemäßen Verfahren erfolgt eine Applizierung einer wässrigen Behandlungslösung auf die Oberfläche eines sich mit einer vorgegebenen Bandgeschwindigkeit in einer Bandlaufrichtung bewegenden Stahlbands durch Aufbringen der wässrigen Behandlungslösung auf eine oder beide Oberflächen des bewegt Stahlbands mit einem Rotationssprüher, welcher mehrere quer zur Bandlaufrichtung nebeneinander angeordnete Sprührotoren aufweist, denen die wässrige Behandlungslösung zugeführt wird und welche von einem Antrieb in Rotation versetzt werden, um die wässrige Behandlungslösung zentrifugalkraftbedingt in Form eines feinen Sprühstrahls auf die oder jede Oberfläche des Stahlbands zu sprühen und dort einen Nassfilm der wässrigen Lösung auszubilden. Vor dem Aufsprühen der wässrigen Behandlungslösung wird das bewegte Stahlband mit einem Gasstrom getrocknet und gesäubert. Nach dem Auftragen des Nassfilms der wässrigen Behandlungslösung wird diese mittels angetriebener Glättrollen auf der Stahlbandoberfläche vergleichmäßigt. Die Glättrollen sind dabei zweckmäßig in Bezug auf die Stahlbandoberfläche(n) so angeordnet, dass sie keinen oder nur wenig Druck auf den Nassfilm der wässrigen Behandlungslösung ausüben und daher keine oder nur einen minimalen Anteil der applizierten Behandlungslösung von der Stahlbandoberfläche abquetschen. Nach der Vergleichmäßigung des aufgesprühten Nassfilms wird dieser getrocknet, so dass eine Trockenauflage der Behandlungssubstanz auf der oder den behandelten Stahlbandoberflächen verbleibt. Zweckmäßig beträgt die Trockenauflage der Behandlungslösung nach dem Trocknen zwischen 1 und 50 mg/m2.In the method according to the invention, an aqueous treatment solution is applied to the surface of a steel belt moving at a predetermined belt speed in a belt running direction by applying the aqueous treatment solution to one or both surfaces of the moving steel belt with a rotary sprayer having a plurality of spray rotors juxtaposed transversely to the belt running direction to which the aqueous processing solution is supplied and which are rotated by a drive to spray the aqueous processing solution in the form of a fine spray jet on the or each surface of the steel strip by centrifugal force and form a wet film of the aqueous solution there. Before spraying the aqueous treatment solution, the moving steel strip is dried with a gas stream and cleaned. After application of the wet film of the aqueous treatment solution, this is made uniform by means of driven smoothing rollers on the steel strip surface. The smoothing rollers are expediently arranged with respect to the steel strip surface (s) such that they exert little or no pressure on the wet film of the aqueous treatment solution and therefore no or only a minimal proportion of the applied treatment solution from the steel strip surface squeezing off. After the sprayed-on wet film is evened out, it is dried so that a dry coating of the treatment substance remains on the treated steel strip or surfaces. Suitably, the dry coverage of the treatment solution after drying is between 1 and 50 mg / m 2 .

Der Gasstrom, mit dem das bewegte Stahlband vor dem Applizieren der wässrigen Behandlungslösung gereinigt und getrocknet wird, wird zweckmäßig durch ein Air-Knife bereitgestellt und als laminarer Heißluftstrom auf die Oberfläche des sich bewegenden Stahlbands aufgeblasen. Dadurch werden störende Fremdpartikel von der Stahlbandoberfläche abgeblasen und die Stahlbandoberfläche wird getrocknet.The gas stream with which the moving steel strip is cleaned and dried before applying the aqueous treatment solution is expediently provided by an air knife and inflated as a laminar flow of hot air onto the surface of the moving steel strip. As a result, disruptive foreign particles are blown off the steel strip surface and the steel strip surface is dried.

Die den Sprührotoren des Rotationssprühers pro Zeiteinheit zugeführte Menge der wässrigen Behandlungslösung wird zweckmäßig an die Bandgeschwindigkeit angepasst. Es besteht dabei bevorzugt ein linearer Zusammenhang zwischen der den Sprührotoren pro Zeiteinheit zugeführten Menge der Behandlungslösung und der Bandgeschwindigkeit. Die den Sprührotoren pro Zeiteinheit und bezogen auf die Breite des Stahlbands und pro Seite zugeführte Menge der Behandlungslösung liegt bevorzugt zwischen 0,4 bis 5,5 Liter pro Minute und Meter und liegt besonders bevorzugt in einem Bereich zwischen 1 bis 3,5 Liter pro Minute und Meter, wobei die Bandgeschwindigkeit in der Regel zwischen 200 und 700 m/min liegt. Die mit den Sprührotoren auf die oder jede Oberflächenseite des Stahlbands aufgesprühte Auflage des Nassfilms der Behandlungslösung liegt entsprechend im bevorzugten Bereich von 2 bis 8 ml/m2 pro Seite des Stahlbands und bevorzugt zwischen 4 und 6 ml/m2 und besonders bevorzugt bei ca. 5 ml/m2.The amount of the aqueous treatment solution fed to the spray rotors of the rotary sprayer per unit time is expediently adapted to the belt speed. In this case, there is preferably a linear relationship between the amount of treatment solution fed to the spray rotors per unit of time and the belt speed. The amount of treatment solution supplied to the spray rotors per unit time and based on the width of the steel strip and per side is preferably between 0.4 and 5.5 liters per minute and meter and is more preferably in a range between 1 and 3.5 liters per minute and meters, the belt speed is usually between 200 and 700 m / min. The coating of the wet film of the treatment solution sprayed onto the or each surface side of the steel strip with the spray rotors is correspondingly in the preferred range of 2 to 8 ml / m 2 per side of the steel strip and preferably between 4 and 6 ml / m 2 and particularly preferably at ca. 5 ml / m 2 .

Um möglichst wenig überschüssige Behandlungslösung von der Stahlbandoberfläche abzuquetschen, wird der aufgetragene Nassfilm der wässrigen Lösung mittels angetriebener Glättrollen vergleichmäßigt, wobei die Glättrollen bevorzugt ein Glättrollenpaar umfassen mit zwei angetriebenen und gegeneinander versetzt angeordneten Glättrollen. Der Abstand der Glättrollen zur Stahlbandoberfläche ist dabei zweckmäßig einstellbar und an die mit dem Rotationssprüher aufgesprühte Menge (Auflage) des Nassfilms der Behandlungslösung anpassbar. Dadurch wird erreicht, dass in Abhängigkeit der aufgesprühten Menge bzw. der Auflage des Nassfilms der Behandlungslösung zwar einerseits eine Vergleichmäßigung des aufgetragenen Nassfilms über die gesamte Breite des Stahlbands ermöglicht wird, ohne andererseits zu hohe Mengen des aufgesprühten Nassfilms wieder von der Stahlbandoberfläche abzuquetschen. Infolgedessen ist es nicht mehr oder nur noch in sehr geringem Umfang erforderlich, überschüssige Behandlungslösung, welche von der Stahlbandoberfläche abgequetscht wird oder abtropft, wieder aufzusammeln und einer Aufbereitung zuzuführen.In order to squeeze as little excess treatment solution from the steel strip surface, the applied wet film of the aqueous solution is homogenized by means of powered smoothing rollers, the smoothing rollers preferably comprise a pair of smoothing rollers with two driven and staggered arranged smoothing rollers. The distance of the smoothing rollers to the steel strip surface is expediently adjustable and adaptable to the sprayed with the rotary sprayer amount (edition) of the wet film of the treatment solution. This ensures that, depending on the sprayed amount or the circulation of the wet film of the treatment solution on the one hand, a homogenization of the applied wet film over the entire width of the steel strip is made possible, without on the other hand, too high amounts of the sprayed wet film back from the To squeeze the steel strip surface. As a result, it is no longer or only to a very small extent necessary, excess treatment solution which is squeezed from the steel strip surface or drips, pick up again and supply a treatment.

Der Rotationssprüher 2 ist zweckmäßig über eine Zufuhrleitung mit einem Vorratsbehälter verbunden, in dem die wässrige Behandlungslösung bevorratet wird. Die wässrige Behandlungslösung kann dem Rotationssprüher aus dem Behälter und über die Zufuhrleitung mittels einer Pumpe zugeführt werden. In dem Vorratsbehälter wird zweckmäßig nur frische Behandlungslösung bevorratet, um Alterungsprobleme zu vermeiden. Anders als bei den bekannten Tauchverfahren kommt die in dem Vorratsbehälter bevorratete Behandlungslösung vor ihrer Applikation auf die Stahlbandoberfläche nicht in Kontakt mit einem (ggf. metallbeschichteten) Stahlblech, was zu einer Verunreinigung der frischen Behandlungslösung (bspw. durch Ablösen der Metallionen aus der Metallbeschichtung) führen könnte.The rotary sprayer 2 is expediently connected via a supply line to a storage container in which the aqueous treatment solution is stored. The aqueous treatment solution may be supplied to the rotary sprayer from the container and via the supply line by means of a pump. In the reservoir, only fresh treatment solution is expediently stored in order to avoid aging problems. Unlike the known dipping method, the treatment solution stored in the storage container does not come into contact with a (possibly metal-coated) steel sheet before its application to the steel strip surface, which leads to contamination of the fresh treatment solution (for example by detachment of the metal ions from the metal coating) could.

Das erfindungsgemäße Verfahren zeichnet sich in erster Linie durch seinen ressourcenschonenden Umgang mit der zu applizierenden Behandlungslösung und durch seine Wirtschaftlichkeit aus. Es wird, anders als bei den bekannten Applikationsverfahren, nur die genau benötigte Menge der Behandlungslösung auf die Stahlbandoberfläche aufgesprüht, ohne dass ein etwaiger Überschuss an Behandlungslösung wieder abgeblasen oder abgequetscht werden müsste. Infolge dessen ist es auch nicht mehr erforderlich, von der Stahlbandoberfläche abgequetschte Überschüsse der Behandlungslösung zu sammeln und einer Wiederaufbereitung zuzuführen. Dadurch können auch nachzubehandelnde Abwässer, die in Wiederaufbereitungsverfahren anfallen, vermieden werden.The inventive method is characterized primarily by its resource-saving handling of the treatment solution to be applied and by its cost-effectiveness. It is, in contrast to the known application method, only the exact amount of the treatment solution sprayed onto the steel strip surface, without any excess of treatment solution would have to be blown off or squeezed again. As a result, it is no longer necessary to collect squeezed from the steel belt surface excesses of the treatment solution and supply a reprocessing. As a result, post-treated wastewater incurred in reprocessing processes can be avoided.

Das erfindungsgemäße Applikationsverfahren eignet sich zum Auftragen von unterschiedlichen Behandlungslösungen auf bewegte Stahlbänder. Mit dem erfindungsgemäßen Verfahren können beispielsweise Passivierungslösungen oder Nachbehandlungslösungen zur Reduzierung des Reibwerts auf Weißblechoberflächen aufgebracht werden. Das erfindungsgemäße Verfahren kann jedoch auch in entsprechender Weise für das Auftragen anderer wässrigen Behandlungslösungen auf Weißblechoberflächen oder auch auf die Oberfläche von Stahlbändern verwendet werden, die mit anderen metallischen Beschichtungen (wie z.B. zink- oder chromhaltige Beschichtungen) beschichtet sind. Das erfindungsgemäße Verfahren kann auch zum Auftragen von wässrigen Behandlungslösungen auf unbeschichtete Stahlbänder verwendet werden, wie z.B. zum Aufbringen einer wässrigen Konversionsbeschichtung auf die Oberfläche von Schwarzblech (warm- oder kaltgewalztes, nicht entzundertes und unbeschichtetes Stahlblech).The application method according to the invention is suitable for applying different treatment solutions to moving steel strips. By way of example, passivation solutions or aftertreatment solutions for reducing the coefficient of friction can be applied to tinplate surfaces using the method according to the invention. However, the method according to the invention can also be used in a corresponding manner for the application of other aqueous treatment solutions on tinplate surfaces or also on the surface of steel strips coated with other metallic coatings (such as coatings containing zinc or chromium) are. The process of the present invention may also be used to apply aqueous processing solutions to uncoated steel belts, such as to apply an aqueous conversion coating to the surface of blackplate (hot or cold rolled, non-descaled and uncoated steel sheet).

Diese und weitere Merkmale sowie Vorteile des erfindungsgemäßen Verfahrens und der erfindungsgemäßen Vorrichtung ergeben sich aus dem nachfolgend unter Bezugnahme auf die begleitenden Zeichnungen näher beschriebenen Ausführungsbeispiel. Die Zeichnungen zeigen:

Fig. 1:
Schematische Darstellung einer Vorrichtung zur Durchführung des erfindungsgemäßen Verfahrens;
Fig. 2:
Detailansicht eines Ausschnitts der Vorrichtung von Figur 1 im Bereich des Rotationssprühers sowie perspektivische Draufsicht auf diesen Rotationssprüher;
These and other features and advantages of the method and the device according to the invention will become apparent from the embodiment described in more detail below with reference to the accompanying drawings. The drawings show:
Fig. 1:
Schematic representation of an apparatus for carrying out the method according to the invention;
Fig. 2:
Detail view of a detail of the device of FIG. 1 in the area of the rotary sprayer as well as perspective top view of this rotary sprayer;

In Figur 1 ist eine Vorrichtung zur Durchführung des erfindungsgemäßen Verfahrens zum Auftragen einer wässrigen Behandlungslösung auf die Oberfläche eines bewegten Stahlbands schematisch dargestellt. Das Stahlband 1 wird dabei über mehrere Umlenkrollen U geführt und bewegt sich mit einer vorgegebenen Bandgeschwindigkeit v in einer Bandlaufrichtung, welche in Figur 1 mit einem Pfeil gekennzeichnet ist. Die Bandgeschwindigkeit beträgt dabei regelmäßig mehr als 200 m/min und bis zu 750 m/min. Bei dem Stahlband 1 kann es sich um ein mit einer Metallbeschichtung beschichtetes und kaltgewalztes Stahlband, beispielsweise um ein Weißblechband oder ein verzinktes Stahlband, handeln. Es kann sich jedoch auch um unbeschichtetes Stahlblech handeln, wie z.B. um ein Schwarzblech-Band.In FIG. 1 a device for carrying out the method according to the invention for applying an aqueous treatment solution to the surface of a moving steel strip is shown schematically. The steel strip 1 is guided over a plurality of deflection rollers U and moves at a predetermined belt speed v in a strip running direction, which in FIG. 1 marked with an arrow. The belt speed is regularly more than 200 m / min and up to 750 m / min. The steel strip 1 can be a steel strip coated with a metal coating and cold-rolled, for example a tinplate strip or a galvanized steel strip. However, it may also be uncoated steel sheet, such as a black-plate tape.

Das Stahlband 1 wird von einer hier nicht dargestellten Transporteinrichtung mit einer vorgegebenen Bandgeschwindigkeit v in eine Bandlaufrichtung bewegt und dabei über Umlenkrollen U geführt. Zunächst wird das Stahlband 1 durch eine erste Trocknungseinrichtung 4 geleitet, um die Oberflächen des Stahlbands 1 zu trocknen und zu reinigen. Die erste Trocknungseinrichtung 4 ist dabei beispielsweise durch ein "Air-Knife" gebildet, welches einen laminaren Heißluftstrom auf die Oberflächen des sich mit der Bandgeschwindigkeit v durchbewegenden Stahlbands 1 bläst, um dadurch die Stahlbandoberflächen zu trocknen und störende Fremdpartikel abzublasen.The steel strip 1 is moved by a transport device not shown here with a predetermined belt speed v in a strip running direction and thereby guided over deflection rollers U. First, the steel strip 1 is passed through a first drying device 4 to dry and clean the surfaces of the steel strip 1. The first drying device 4 is formed for example by an "air knife", which is a laminar hot air flow to the surfaces of the with Belt speed v by moving steel strip 1 blows, thereby drying the steel strip surfaces and blow off disturbing foreign particles.

An die erste Trocknungseinrichtung 4 schließt sich ein Rotationssprüher 2 an. Der Rotationssprüher ist in Figur 2 im Detail gezeigt. Der Rotationssprüher 2 weist mehrere quer zu Bandlaufrichtung nebeneinander und im Abstand zueinander angeordnete Sprührotoren 3 auf. Die Sprührotoren 3 sind über eine zentrale Zufuhrleitung 6 und davon abgezweigte Abzweigleitungen 6a, 6b, 6c, etc. mit einem Vorratsbehälter 9 verbunden. In dem Vorratsbehälter 9 ist die wässrige Behandlungslösung bevorratet, welche auf die Stahlbandoberfläche appliziert werden soll. Die wässrige Behandlungslösung wird zweckmäßig mittels einer Pumpe 8 in die Zufuhrleitung 6 gepumpt, von wo sie in die Abzweigleitungen 6a, 6b, 6c geleitet wird, wobei jede Abzweigleitung mit einem der Sprührotoren 3 verbunden ist. Zur Erfassung der in die Zufuhrleitung 6 gepumpten Menge der wässrigen Behandlungslösung ist in der Zufuhrleitung 6 zweckmäßig ein Durchflussmesser 11 vorgesehen.The first drying device 4 is followed by a rotary sprayer 2. The rotary sprayer is in FIG. 2 shown in detail. The rotary sprayer 2 has a plurality of transverse to the strip running direction next to each other and spaced spray nozzles 3. The spray rotors 3 are connected to a reservoir 9 via a central supply line 6 and diverted branch lines 6a, 6b, 6c, etc. thereof. In the reservoir 9, the aqueous treatment solution is stored, which is to be applied to the steel strip surface. The aqueous treatment solution is expediently pumped by means of a pump 8 into the supply line 6, from where it is conducted into the branch lines 6a, 6b, 6c, wherein each branch line is connected to one of the spray rotors 3. For detecting the amount of the aqueous treatment solution pumped into the supply line 6, a flow meter 11 is expediently provided in the supply line 6.

Über die Zufuhrleitung 6 und den daran angeordneten Abzweigleitungen wird die wässrige Behandlungslösung den Sprührotoren 3 des Rotationssprühers 2 zugeführt. Die Sprührotoren 3 weisen jeweils einen von einem Antrieb in Rotation versetzten Teller auf Aufgrund der Rotation des Tellers der Sprührotoren 3 wird die zugeführte wässrige Behandlungslösung durch die Zentrifugalkraft nach außen zum Tellerrand gefördert. Der Tellerrand ist so geformt, dass die wässrige Behandlungslösung in Form feiner Tröpfchen von dem Tellerrand des rotierenden Tellers wegfliegt. Der Tröpfchendurchmesser liegt, abhängig von der Viskosität und der Oberflächenspannung der verwendeten Behandlungslösung, in der Regel zwischen 30 und 70 Mikrometer. Die vom Tellerrand wegfliegenden Tröpfchen der Behandlungslösung werden vollumfänglich um den rotierenden Teller der Sprührotoren 3 versprüht. Die Sprührotoren 3 sind quer zur Bandlaufrichtung so angeordnet, dass sich die Sprühstrahlen 12 benachbarten Sprührotoren 3 auf der Oberfläche des Stahlbands 1 überlappen, um einen gleichmäßigen Auftrag der wässrigen Behandlungslösung über die gesamte Breite B des Stahlbands 1 sich zu stellen.Via the supply line 6 and the branch lines arranged thereon, the aqueous treatment solution is fed to the spray rotors 3 of the rotary sprayer 2. The spray rotors 3 each have a plate set in rotation by a drive. Due to the rotation of the plate of the spray rotors 3, the supplied aqueous treatment solution is conveyed outwards to the plate rim by the centrifugal force. The rim of the plate is shaped such that the aqueous treatment solution in the form of fine droplets flies away from the rim of the rotating plate. The droplet diameter, depending on the viscosity and the surface tension of the treatment solution used, is usually between 30 and 70 micrometers. The droplets of the treatment solution flowing away from the edge of the plate are sprayed in full around the rotating plate of the spray rotors 3. The spray rotors 3 are arranged transversely to the strip running direction so that the spraying jets 12 adjacent spray rotors 3 overlap on the surface of the steel strip 1 in order to provide a uniform application of the aqueous treatment solution over the entire width B of the steel strip 1.

Die den Sprührotoren 3 pro Zeiteinheit zugeführte Menge der wässrigen Behandlungslösung wird dabei zweckmäßig an die Bandgeschwindigkeit v angepasst, mit der sich das Stahlband 1 bewegt. Dabei besteht ein linearer Zusammenhang zwischen der den Sprührotoren pro Zeiteinheit zugeführten Menge der Behandlungslösung und der Bandgeschwindigkeit v. Die den Sprührotoren pro Zeiteinheit Δt und bezogen auf die Breite B des Stahlbands 1 zugeführte Menge M der Behandlungslösung variiert dabei in der Regel zwischen M/Δt · B = 0,4 bis 5,5 Liter pro Minute und Meter und liegt bevorzugt zwischen M/Δt · B = 1,0 bis 3,5 Liter pro Minute und Meter. Bei einer typischen Bandgeschwindigkeit von 200 bis 700 m/min beträgt die mit den Sprührotoren 3 auf die Oberfläche des Stahlbands 1 aufgesprühte Menge des Nassfilms der Behandlungslösung zwischen 2 und 8 ml/m2 und bevorzugt zwischen 4 und 6 ml/m2 und besonders bevorzugt ca. 5 ml/m2.The amount of aqueous treatment solution supplied to the spray rotors 3 per unit of time is expediently adapted to the belt speed v, with which the steel belt 1 moves. There is a linear relationship between the spray rotors per Time unit supplied amount of the treatment solution and the belt speed v. The amount M of the treatment solution fed to the spray rotors per unit time Δt and based on the width B of the steel strip 1 generally varies between M / Δt · B = 0.4 to 5.5 liters per minute and meter and is preferably between M /. Δt · B = 1.0 to 3.5 liters per minute and meter. At a typical belt speed of 200 to 700 m / min, the amount of the wet film of the treatment solution sprayed with the spray rotors 3 on the surface of the steel strip 1 is between 2 and 8 ml / m 2, and more preferably between 4 and 6 ml / m 2, and more preferably about 5 ml / m 2 .

Die wässrige Behandlungslösung kann mittels des Rotationssprühers 2 entweder nur auf eine Seite des Stahlbands 1 oder auch beidseitig auf die Oberflächen des Stahlbands 1 aufgesprüht werden. Ggf. sind hierfür zu beiden Seiten des durchgeführten Stahlbands 1 Rotationssprüher 2 angeordnet.The aqueous treatment solution can be sprayed by means of the rotary sprayer 2 either only on one side of the steel strip 1 or on both sides of the surfaces of the steel strip 1. Possibly. For this purpose, 1 rotary sprayer 2 are arranged on both sides of the carried steel strip.

Nach dem Aufbringen der wässrigen Behandlungslösung als Nassfilm auf die oder jede Oberfläche des Stahlbands 1 wird das Stahlband 1 zwischen drehend angetriebene Glättrollen 5a, 5b durchgeführt. Die Glättrollen 5 dienen zur Vergleichmäßigung des aufgetragenen Nassfilms der wässrigen Lösung. Bevorzugt wird hierfür ein Glättrollenpaar 5 mit zwei gegeneinander versetzt angeordneten Glättrollen 5a und 5b verwendet. Die versetzte Anordnung der Glättrollen 5a, 5b ist in den Figuren dargestellt. Wie aus den Figuren hervorgeht, sind die Glättrollen 5a, 5b so zueinander angeordnet, dass die Verbindungslinie der parallel zueinander und parallel zur Stahlbandoberfläche verlaufenden Rotationsachsen der Glättrollen im Querschnitt mit dem durch die beiden Glättrollen durchgeführten Stahlband 1 einen Winkel von ca. 30° bis 60° und insbesondere von ca. 45° einschließt. Anders als die aus dem Stand der Technik bekannten Abquetschrollen, welche symmetrisch zum Stahlband angeordnet sind und einen Anpressdruck ausüben, um überschüssige Behandlungslösung von der Stahlbandoberfläche abzuquetschen, üben die hier verwendeten Glättrollen keinen Wesentlichen Anpressdruck auf die Stahlbandoberfläche aus. Dadurch wird keine oder nur ein sehr geringer Anteil der aufgesprühten Behandlungslösung von der Stahlbandoberfläche abgequetscht. Das Glättrollenpaar 5 führt nur zu einer Vergleichmäßigung des Nassfilms der Behandlungslösung über die gesamte Oberfläche des Stahlbands. Dadurch wird ein konstanter Auftrag eines Nassfilms der Behandlungslösung mit homogener Schichtdicke über die gesamte Oberfläche des Stahlbands gewährleistet und es wird erreicht, dass keine überschüssige Behandlungslösung anfällt, welche aufgesammelt und einer Wiederaufbereitung zugeführt werden müsste.After applying the aqueous processing solution as a wet film on the or each surface of the steel strip 1, the steel strip 1 is performed between rotationally driven smoothing rollers 5a, 5b. The smoothing rollers 5 serve to even out the applied wet film of the aqueous solution. For this purpose, preference is given to using a smoothing roller pair 5 with two smoothing rollers 5a and 5b offset from one another. The staggered arrangement of the smoothing rollers 5a, 5b is shown in the figures. As can be seen from the figures, the smoothing rollers 5a, 5b are arranged relative to one another in such a way that the connecting line of the axes of rotation of the smoothing rollers running parallel to one another and parallel to the steel belt surface has an angle of approximately 30 ° to 60 ° in cross section with the steel belt 1 passed through the two smoothing rollers ° and in particular of about 45 °. Unlike the pinch rollers known from the prior art, which are arranged symmetrically to the steel band and exert a contact pressure to squeeze off excess treatment solution from the steel belt surface, the smoothing rollers used here exert no substantial contact pressure on the steel belt surface. As a result, no or only a very small proportion of the sprayed treatment solution is squeezed from the steel strip surface. The smoothing roller pair 5 only leads to a homogenization of the wet film of the treatment solution over the entire surface of the steel strip. This ensures a constant application of a wet film of the treatment solution with homogeneous layer thickness over the entire surface of the steel strip and it is achieved that no excess treatment solution accumulates, which would have to be collected and recycled.

Im Anschluss an die Glättrollen 5 wird das Stahlband 1 durch eine zweite Trocknungseinrichtung 7 geleitet. Bei der zweiten Trocknungseinrichtung 7 kann es sich um einen Trocknungsofen oder um einen Infrarot- oder Heißluft-Trockner handeln.Following the smoothing rollers 5, the steel strip 1 is passed through a second drying device 7. The second drying device 7 may be a drying oven or an infrared or hot air dryer.

Nach dem Trocknen verbleibt auf der oder jeder Oberfläche des Stahlbands 1 eine gleichmäßige Trockenauflage der Behandlungslösung, wobei die Trockenauflage nach dem Trocknen in der Regel zwischen 1 und 50 mg/m2 und bevorzugt zwischen 2 und 30 mg/m2 liegt. Besonders bevorzugt beträgt die Trockenauflage der Behandlungslösung ca. 10 mg/m2.After drying, a uniform dry coating of the treatment solution remains on the or each surface of the steel strip 1, wherein the dry coating after drying is generally between 1 and 50 mg / m 2 and preferably between 2 and 30 mg / m 2 . The dry coverage of the treatment solution is particularly preferably about 10 mg / m 2 .

Bei der wässrigen Behandlungslösung kann es sich beispielsweise um eine chromfreie, oberflächenaktive Passivierungslösung handeln, wie sie in der DE 10 2005 045 034 A1 zur chromfreien Passivierung von Weißblechoberflächen beschrieben worden ist. Bei der wässrigen Behandlungslösung kann es sich auch um eine chromfreie Passivierungslösung zur Passivierung von Weißblech handeln, welche wasserlösliche anorganische Verbindungen der Elemente Zirkonium und Titan oder Aluminium enthält. Solche wässrigen Behandlungslösungen können in einem zweistufigen Passivierungsverfahren zur Passivierung von Weißblech verwendet werden, wobei in einer ersten Stufe eine anodische Oxidation der Weißblechoberfläche durchgeführt und in einer zweiten Stufe die Applizierung der wässrigen Behandlungslösung auf die Weißblechoberfläche erfolgt, wobei die Behandlungslösung wasserlösliche anorganische Verbindungen der Elemente Zirkonium und/oder Titan oder Aluminium enthält. Die Applizierung der wässrigen Behandlungslösung kann dabei mit dem erfindungsgemäßen Verfahren erfolgen.The aqueous treatment solution may be, for example, a chromium-free, surface-active passivation solution, as described in US Pat DE 10 2005 045 034 A1 for chromium-free passivation of tinplate surfaces has been described. The aqueous treatment solution may also be a chromium-free passivation solution for the passivation of tinplate, which contains water-soluble inorganic compounds of the elements zirconium and titanium or aluminum. Such aqueous treatment solutions can be used in a two-pass passivation of tinplate, wherein in a first stage anodic oxidation of the tinplate surface is carried out and in a second stage, the application of the aqueous treatment solution on the tinplate surface, wherein the treatment solution water-soluble inorganic compounds of zirconium and / or titanium or aluminum. The application of the aqueous treatment solution can be carried out with the method according to the invention.

Der Applikation der wässrigen Behandlungslösung mit dem erfindungsgemäßen Verfahren ist dann noch der erste Schritt der anodischen Oxidation der Weißblechoberfläche voranzustellen. Hierfür wird - wie in Figur 1 schematisch gezeigt - das Stahlband 1 mit der vorgegebenen Bandgeschwindigkeit v durch einen Tank 10 mit einem wässrigen Elektrolyten (bspw. eine Soda-Lösung) geleitet und in einem elektrischen Stromkreis als Anode geschaltet, um die Weißblechoberfläche anodisch zu oxidieren. Es hat sich gezeigt, dass sich durch eine solche anodische Oxidation der Weißblechoberfläche eine besonders inerte Oxidationsschicht an der verzinnten Oberfläche des Weißblechs ausbildet, die im Wesentlichen aus (inertem) vierwertigen Zinnoxid SnO2 besteht und die Weißblechoberfläche gegen natürliches Anwachsen einer Oxidschicht durch Luftsauerstoff sowie gegen Reaktionen mit schwefelhaltigen Materialien schützt. Eine solche anodische Oxidation einer Weißblechoberfläche mit anschließender Behandlung der oxidierten Oberfläche mit einem chromfreien wässrigen Nachbehandlungsmittel, welches insbesondere Titan und/oder Zirkonium enthält, kann die verzinnte Oberfläche des Stahlbands daher flächendeckend gegen Korrosion und gegen eine Verfärbung der Oberfläche durch Reaktion des Zinns mit Schwefel schützen.The application of the aqueous treatment solution with the method according to the invention is then preceded by the first step of the anodic oxidation of the tinplate surface. For this purpose - as in FIG. 1 shown schematically - the steel strip 1 with the predetermined belt speed v passed through a tank 10 with an aqueous electrolyte (eg., A soda solution) and connected in an electrical circuit as the anode to anodically oxidize the tinplate surface. It has been shown that such a anodic oxidation of the tinplate surface forms a particularly inert oxidation layer on the tinned surface of the tinplate, which consists essentially of (inert) tetravalent tin oxide SnO 2 and protects the tinplate surface against natural growth of an oxide layer by atmospheric oxygen as well as against reactions with sulfur-containing materials. Such an anodic oxidation of a tinplate surface with subsequent treatment of the oxidized surface with a chromium-free aqueous aftertreatment agent, which in particular contains titanium and / or zirconium, can therefore protect the tinned surface of the steel strip completely against corrosion and against discoloration of the surface by reaction of the tin with sulfur ,

Mit dem erfindungsgemäßen Verfahren kann auch eine metallische oder organische Konversionsbeschichtung auf einem Schwarzblech (unbeschichtetes, kalt- oder warmgewalztes Stahlblech) appliziert werden. Es hat sich gezeigt, dass das erfindungsgemäße Verfahren beispielsweise zum Applizieren von Konversionsbeschichtungen auf Schwarzblech geeignet ist, welche metallische Bestandteile wie Titan, Zirkonium, Mangan, Zink oder auch Phosphor oder organische Bestandteile wie Polyacrylat oder Polycarboxylat enthalten. Solche Konversionsbeschichtungen bieten einen guten Schutz der Oberfläche des Schwarzblechs gegen Korrosion, so dass entsprechend behandeltes Schwarzblech bspw. als Ersatz für Stahlblech verwendet werden kann, welches mit einer metallischen Korrosionsschutzschicht aus Chrom (wie ECCS, "electrolytic chromium coated steeel") beschichtet ist.With the method according to the invention, a metallic or organic conversion coating on a black plate (uncoated, cold or hot rolled steel sheet) can be applied. It has been found that the method according to the invention is suitable, for example, for applying conversion coatings to blackplate which contain metallic constituents such as titanium, zirconium, manganese, zinc or even phosphorus or organic constituents such as polyacrylate or polycarboxylate. Such conversion coatings provide good protection of the surface of the blackplate against corrosion, so that appropriately treated blackplate, for example, can be used as a substitute for steel sheet coated with a metallic anti-corrosion layer of chromium (such as ECCS, "electrolytic chromium coated steeel").

Claims (15)

  1. Method for applying an aqueous treatment solution to the surface of a steel strip (1) movingat a predetermined strip speed in a strip running direction, with the following steps:
    - drying of the moving steel strip (1) with a stream of gas,
    - application of the aqueous solution to at least one surface of the steel strip (1) with a rotary sprayer (2) with a plurality of spraying rotors (3) which are arranged next to one another transversely to the strip running direction and to which the aqueous treatment solution is fed and which are set in rotation by a drive in order to spray the treatment solution through centrifugal force in the form of a spray jet onto the surface of the steel strip (1) and there form a wet film of the aqueous treatment solution,
    - eveningout of the applied wet film of the aqueous treatment solution by means of driven smoothing rollers (5; 5a, 5b),
    - drying of the applied wet film of the aqueous treatment solution.
  2. Method according to claim 1, characterised in that the stream of gas for drying the moving steel strip is blown onto the surface of the moving steel strip with an air knife (4) in the form of a laminar stream of hot air.
  3. Method according to one of the preceding claims, characterised in that the quantity of the treatment solution fed to the spraying rotors (3) per unit of time is adapted to the strip speed at which the steel strip (1) is moving, wherein preferably a linear relationship exists between the quantity of the treatment solution fed to the spraying rotors per unit of time and the strip speed.
  4. Method according to one of the preceding claims, wherein the quantity (M) of the treatment solution fed to the spraying rotors (3) per unit of time (Δt) and in relation to the breadth (B) of the steel strip lies between M/Δt*B = 0.4 to 5.5 litres per minute and metre (1/min*m) and preferably between M/Δt*B = 1.0 to 3.5 litres per minute and metre (1/min*m).
  5. Method according to one of the preceding claims, wherein the strip speed lies between 200 and 700 m/min.
  6. Method according to one of the preceding claims, wherein the quantity of the wet film of the treatment solution applied to the or each surface side of the steel strip with the spraying rotors lies between 2 ml/m2 and 8 ml/m2 and preferably between 4 ml/m2 and 6 ml/m2 and is particularly preferably approximately 5 ml/m2.
  7. Method according to one of the preceding claims, wherein the dry film coating thickness of the treatment solution after the drying lies between 1.0 mg/m2 and 50 mg/m2 and preferably between 2 mg/m2 and 30 mg/m2 and is particularly preferably approximately 10 mg/m2.
  8. Method according to one of the preceding claims, wherein the evening out of the applied wet film of the aqueous solution is carried out by means of a driven pair of smoothing rollers (5) with two smoothing rollers (5a, 5b) arranged offset in relation to one another.
  9. Method according to one of the preceding claims, characterised in that the steel strip is a tinned steel strip (tinplate) and in that the aqueous treatment solution is a passivating solution for passivating the coating of tin, in particular a chromium-free passivating solution.
  10. Method according to one of claims 1 to 8, characterised in that the steel strip is an uncoated steel strip (black plate) and in that the aqueous treatment solution is a metal-containing or an organic treatment solution for application of a conversion coating protecting against corrosion to the surface of the steel strip (black plate).
  11. Method according to one of claims 9 or 10, characterised in that before the application of the aqueous treatment solution anodic oxidation of the surface of the steel strip (1) is carried out, preferably by passing the steel strip at the strip speed through a basic electrolyte.
  12. Method according to claim 9, characterised in that the aqueous treatment solution (passivating solution) contains copolymers of acrylates, polymethyl siloxanes with polyether side chains, acid polyethers, polymers with heterocyclic groups and/or acid compounds with complex metal fluoride anions with divalent to tetravalent cations and polymeric substances.
  13. Method according to one of the preceding claims, characterised in that the aqueous treatment solution contains at least one of the following constituents:
    titanium, zirconium, aluminium, in particular aluminium nitrate, manganese, zinc, phosphorus, polyacrylate or polycarboxylate.
  14. Device for implementing the method according to one of the preceding claims, with:
    - a transport device for transporting the steel strip (1) in a strip running direction at a predetermined strip speed (v);
    - a first drying device (4) for drying the steel strip (1) ;
    - at least one rotary sprayer (2) with a plurality of spraying rotors (3) which are arranged next to one another transversely to the strip running direction, wherein the rotary sprayer (2) for application of the aqueous treatment solution to at least one surface of the steel strip (1) is arranged a distance from this surface of the steel strip (1);
    - a feeding device (6, 8) for supplying the rotary sprayer (2) with the treatment solution, with a feeding pipe (6) which is in connection with the rotary sprayer (2) and with a supply container (9) for the aqueous treatment solution;
    - a drive with which the spraying rotors (3) of the rotary sprayer (2) are set in rotation in order to spray the aqueous treatment solution through centrifugal force in the form of a spray jet onto the surface of the steel strip (1) and there form a wet film of the aqueous solution;
    - a pair of driven smoothing rollers (5a, 5b) which are arranged following the rotary sprayer (2) in the strip running direction and which are used to even out the applied wet film of the aqueous solution on the surface of the steel strip (1);
    - a second drying device (7) for drying the applied wet film of the aqueous solution.
  15. Device according to claim 14, characterised in that the feeding device (6, 8) comprises a pump (8) which is connected with a control unit coupled with the transport device in order to adapt the quantity of the treatment solution fed to the rotary sprayer (2) per unit of time to the strip speed.
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CN104289394B (en) 2019-06-18
DE102013107505A1 (en) 2015-01-22
CN104289394A (en) 2015-01-21
BR102014015410B1 (en) 2021-10-26
CA2851472C (en) 2016-06-07
JP6391279B2 (en) 2018-09-19
RU2014127434A (en) 2016-02-10
ES2572562T3 (en) 2016-06-01
RU2651545C2 (en) 2018-04-20
US20150024137A1 (en) 2015-01-22
EP2826887A1 (en) 2015-01-21
CA2851472A1 (en) 2015-01-16
BR102014015410A2 (en) 2015-10-06

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