EP2845929A1 - Fer-blanc revêtu d'une couche polymère et son procédé de fabrication - Google Patents

Fer-blanc revêtu d'une couche polymère et son procédé de fabrication Download PDF

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Publication number
EP2845929A1
EP2845929A1 EP14171749.6A EP14171749A EP2845929A1 EP 2845929 A1 EP2845929 A1 EP 2845929A1 EP 14171749 A EP14171749 A EP 14171749A EP 2845929 A1 EP2845929 A1 EP 2845929A1
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EP
European Patent Office
Prior art keywords
tin
coating
tinplate
polymer coating
polymer
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.)
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Application number
EP14171749.6A
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German (de)
English (en)
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EP2845929B1 (fr
Inventor
Kathleen Dr. Stein-Fechner
Tanja Dr. Lommel
Reiner Dr. Sauer
Beate Dr. Bannemann
Petra Diederich
Benjamin Liebscher
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ThyssenKrupp Rasselstein GmbH
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ThyssenKrupp Rasselstein GmbH
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Application filed by ThyssenKrupp Rasselstein GmbH filed Critical ThyssenKrupp Rasselstein GmbH
Priority to RS20171217A priority Critical patent/RS56605B1/sr
Priority to PL14171749T priority patent/PL2845929T3/pl
Publication of EP2845929A1 publication Critical patent/EP2845929A1/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
    • C23C28/00—Coating for obtaining at least two superposed coatings either by methods not provided for in a single one of groups C23C2/00 - C23C26/00 or by combinations of methods provided for in subclasses C23C and C25C or C25D
    • C—CHEMISTRY; METALLURGY
    • C25—ELECTROLYTIC OR ELECTROPHORETIC PROCESSES; APPARATUS THEREFOR
    • C25D—PROCESSES FOR THE ELECTROLYTIC OR ELECTROPHORETIC PRODUCTION OF COATINGS; ELECTROFORMING; APPARATUS THEREFOR
    • C25D5/00—Electroplating characterised by the process; Pretreatment or after-treatment of workpieces
    • C25D5/34—Pretreatment of metallic surfaces to be electroplated
    • C25D5/36—Pretreatment of metallic surfaces to be electroplated of iron or steel
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
    • B65D—CONTAINERS FOR STORAGE OR TRANSPORT OF ARTICLES OR MATERIALS, e.g. BAGS, BARRELS, BOTTLES, BOXES, CANS, CARTONS, CRATES, DRUMS, JARS, TANKS, HOPPERS, FORWARDING CONTAINERS; ACCESSORIES, CLOSURES, OR FITTINGS THEREFOR; PACKAGING ELEMENTS; PACKAGES
    • B65D25/00—Details of other kinds or types of rigid or semi-rigid containers
    • B65D25/14—Linings or internal coatings
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
    • B65D—CONTAINERS FOR STORAGE OR TRANSPORT OF ARTICLES OR MATERIALS, e.g. BAGS, BARRELS, BOTTLES, BOXES, CANS, CARTONS, CRATES, DRUMS, JARS, TANKS, HOPPERS, FORWARDING CONTAINERS; ACCESSORIES, CLOSURES, OR FITTINGS THEREFOR; PACKAGING ELEMENTS; PACKAGES
    • B65D25/00—Details of other kinds or types of rigid or semi-rigid containers
    • B65D25/34—Coverings or external coatings
    • C—CHEMISTRY; METALLURGY
    • C25—ELECTROLYTIC OR ELECTROPHORETIC PROCESSES; APPARATUS THEREFOR
    • C25D—PROCESSES FOR THE ELECTROLYTIC OR ELECTROPHORETIC PRODUCTION OF COATINGS; ELECTROFORMING; APPARATUS THEREFOR
    • C25D11/00—Electrolytic coating by surface reaction, i.e. forming conversion layers
    • C25D11/005—Apparatus specially adapted for electrolytic conversion coating
    • C—CHEMISTRY; METALLURGY
    • C25—ELECTROLYTIC OR ELECTROPHORETIC PROCESSES; APPARATUS THEREFOR
    • C25D—PROCESSES FOR THE ELECTROLYTIC OR ELECTROPHORETIC PRODUCTION OF COATINGS; ELECTROFORMING; APPARATUS THEREFOR
    • C25D11/00—Electrolytic coating by surface reaction, i.e. forming conversion layers
    • C25D11/02—Anodisation
    • C25D11/34—Anodisation of metals or alloys not provided for in groups C25D11/04 - C25D11/32
    • C—CHEMISTRY; METALLURGY
    • C25—ELECTROLYTIC OR ELECTROPHORETIC PROCESSES; APPARATUS THEREFOR
    • C25D—PROCESSES FOR THE ELECTROLYTIC OR ELECTROPHORETIC PRODUCTION OF COATINGS; ELECTROFORMING; APPARATUS THEREFOR
    • C25D5/00—Electroplating characterised by the process; Pretreatment or after-treatment of workpieces
    • C25D5/48—After-treatment of electroplated surfaces
    • C25D5/50—After-treatment of electroplated surfaces by heat-treatment
    • C25D5/505—After-treatment of electroplated surfaces by heat-treatment of electroplated tin coatings, e.g. by melting
    • C—CHEMISTRY; METALLURGY
    • C25—ELECTROLYTIC OR ELECTROPHORETIC PROCESSES; APPARATUS THEREFOR
    • C25D—PROCESSES FOR THE ELECTROLYTIC OR ELECTROPHORETIC PRODUCTION OF COATINGS; ELECTROFORMING; APPARATUS THEREFOR
    • C25D7/00—Electroplating characterised by the article coated
    • C25D7/06—Wires; Strips; Foils
    • C25D7/0614—Strips or foils
    • C—CHEMISTRY; METALLURGY
    • C25—ELECTROLYTIC OR ELECTROPHORETIC PROCESSES; APPARATUS THEREFOR
    • C25D—PROCESSES FOR THE ELECTROLYTIC OR ELECTROPHORETIC PRODUCTION OF COATINGS; ELECTROFORMING; APPARATUS THEREFOR
    • C25D7/00—Electroplating characterised by the article coated
    • C25D7/06—Wires; Strips; Foils
    • C25D7/0614—Strips or foils
    • C25D7/0621—In horizontal cells
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T428/00—Stock material or miscellaneous articles
    • Y10T428/12—All metal or with adjacent metals
    • Y10T428/12493—Composite; i.e., plural, adjacent, spatially distinct metal components [e.g., layers, joint, etc.]
    • Y10T428/12535—Composite; i.e., plural, adjacent, spatially distinct metal components [e.g., layers, joint, etc.] with additional, spatially distinct nonmetal component
    • Y10T428/12542—More than one such component
    • Y10T428/12549—Adjacent to each other

Definitions

  • the invention relates to a coated with a polymer coating tinplate and method for its preparation and an apparatus for performing the method.
  • Tinplate is a thin, cold-rolled steel sheet, the surface of which is coated with tin.
  • the application of the tin coating on the steel sheet is usually carried out electrolytically.
  • Tinplate is mainly used for the production of packaging, in particular cans for food and pet food, packaging for chemical and technical products, aerosol cans, beverage cans and for the production of parts for such packaging as e.g. Closures, flap bands, valve plates, can ends and lid rings used.
  • Tinplate is characterized by high corrosion resistance and stability against acids as well as good formability.
  • the tinplate surface is additionally provided with a paint or a polymer coating, in addition to the corrosion protection by the tin coating to ensure additional protection against corrosion.
  • a plastic film of polyethylene terephthalate (PET) or polypropylene (PP) is applied to the tinplate.
  • Foil-coated tinplate is particularly suitable for the production of valve plates, aerosol can bottoms, can openers, deep-drawn containers and vacuum closures.
  • Tinned steel sheets are known, which are coated with a polyester resin film, in particular of polyethylene terephthalate (PET).
  • PET polyethylene terephthalate
  • the coating of the tinplate surface with the polyester resin film is carried out by laminating a polyester film, in particular a PET film, on the surface of the tinplate.
  • a chromium-containing adhesive layer is applied to the tinplate surface prior to laminating the polyester resin film which is formed, for example, by a monolayer of hydrated chromium oxide or by a double layer of metallic chromium with an overlying layer of hydrated chromium oxide ,
  • the polyester resin film especially a PET film, would peel off the tinplate, particularly in forming processes in the packaging manufacturing processes or in sterilizing or filling the packages with hot fillers.
  • the chromium compounds used for the preparation of the chromium-containing adhesive layer are toxic and environmentally hazardous.
  • electrolytic chromium coated steel As an alternative material for tinplate, electrolytic chromium coated steel (ECCS) is known from the prior art.
  • This material also known as "Tin-Free Steel (TFS)"
  • TFS Tin-Free Steel
  • the surface of this material has good adhesion to polymeric materials, such as polyethylene terephthalate or polypropylene, and therefore can be coated with these polymers, for example, by laminating a polymeric film to allow additional corrosion protection.
  • the adhesion of the polymer coating on the chromium surface of the ECCS or TFS also holds strong transformations, such as occur in the production of packaging containers, as well as sterilization processes stood.
  • ECCS sheets provided with polymer coatings are used particularly in manufacturing processes for containers in which large deformations of the sheets are required, such as in the production of Valve plates for aerosol cans, wherein the organic coating in the ECCS before forming takes place, otherwise severe tool wear occurs.
  • a corrosion-resistant steel sheet which has a metallic corrosion protection layer, which may be, for example, electrolytically applied tin or chromium / chromium oxide layers on which one or both sides a transparent polymer film is applied by laminating a polymer film.
  • the polymer film consists of polyethylene terephthalate (PET), polyvinyl chloride (PVC) or polypropylene (PP).
  • an adhesion promoter in particular an adhesive layer, is provided between the metallic corrosion protection layer of the steel sheet and the laminated polymer film.
  • a galvanically coated with a metallic corrosion protection layer and passivated steel sheet with a thickness between 0.05 mm and 0.5 mm is used and heated to temperatures of about 160 ° C.
  • the polymer film is laminated by means of rotating rollers.
  • the thickness of the laminated polymer film is between 5 and 100 ⁇ m.
  • the polymer film preferably has on one side an adhesive layer which has a lower melting point than the polymer material of the polymer film.
  • the polymer film is laminated with the adhesive layer on the surface of the metallic corrosion protection layer of the steel sheet oriented.
  • a special polymer film having an adhesive layer is used to laminate the polymer film on the surface of the anticorrosion layer of the steel sheet.
  • Such polymer films with an adhesive layer are very expensive to manufacture.
  • the handling of such polymer films with an adhesive layer more complex and the process parameters, in particular the temperatures must be kept during the lamination within the specified limits, which are determined by the melting temperatures of the polymer film and the adhesive layer.
  • an adhesive layer can not be dispensed with if sufficiently good adhesion of the polymer film to the tinned surface of the steel sheet is to be ensured.
  • the polymer films adhere better, but in the production of ECCS due to the chromium-containing substances used in the coating of the steel sheet toxic and environmentally harmful waste.
  • the object of the invention is to provide a method which is as completely as possible free of chromium for the production of a highly corrosion-resistant steel sheet.
  • the highly corrosion-resistant steel sheet produced by the method should be suitable in particular for the production of packaging and suffer no deterioration in terms of corrosion resistance even with severe deformations in the manufacturing process and sterilization of the package produced.
  • the chromium-free tin surface of the tinned steel sheet is first electrochemically oxidized in a first step and in a second step a polymer coating is applied to the oxidized tin surface.
  • the electrochemical oxidation of the tin surface ensures chromium-free passivation of the tin surface, which prevents unhindered growth of tin oxide on the tinplate surface.
  • the passivation of the tinplate surface takes place in the process according to the invention without the use of chromium-containing substances. especially without the use of toxic and environmentally hazardous chromium oxides. It has surprisingly been found that this chromium-free passivation of the tinplate surface by electrochemical oxidation not only prevents unhindered growth of tin oxide on the tinplate surface, but at the same time also forms a good adhesion base for polymers.
  • a polymer coating can be applied without problems to the oxidized tin surface of the tinplate, the oxidized tin surface allowing a very good adhesion of the polymer coating. It has been found that the adhesion between the oxidized tin surface and the polymer coating also withstands severe deformation, as occurs, for example, in processes for the production of multi-deep-drawn cans or in the manufacture of valve plates. The adhesion between the oxidized tin surface and the polymer coating also readily withstands sterilization, without any detachment of the polymer coating from the tinplate surface during sterilization.
  • a tin coating is deposited electrolytically on one or both sides of a steel sheet.
  • an electrochemical oxidation of the surface of the tin coating takes place and finally a polymer coating is applied to the oxidized surface of the tin coating.
  • the electrochemical oxidation of the tin surface is preferably carried out directly and in particular within a few seconds after the deposition of the tin coating on the steel sheet.
  • the electrochemical oxidation of the tin surface preferably takes place here without further intermediate steps, in particular without intermediate cleaning or temperature treatment of the tinplate surface.
  • the electrochemical oxidation of the tin surface can be carried out in particular by anodic polarization of the tinned steel sheet in an aqueous and chromium-free electrolyte.
  • the electrochemical oxidation of the tin surface may be carried out by immersing the tinplate in a soda solution (sodium carbonate solution).
  • a thin tin oxide layer which consists essentially of tetravalent tin oxide (SnO 2 ), forms on the (chromium-free) tin surface of the tinplate.
  • This tetravalent tin oxide is resistant to bivalent tin oxide (SnO), which occurs when tinplate is stored in an oxygen-containing atmosphere on the tinplate surface is formed, substantially inert and prevents unhindered growth of a (divalent) tin oxide layer on the tinplate surface on contact with oxygen.
  • the thickness of the oxide layer of substantially tetravalent tin oxide formed in the electrochemical oxidation of the tinplate surface is expediently in the nm range and is preferably thinner than 100 nm.
  • a charge density is preferred in the step of electrochemical oxidation the tin surface produced, which is at most 40 C / m 2 .
  • the polymer coating expediently has a thickness in the range of 10 to 100 microns and is preferably applied by laminating a polymer film on the oxidized tin surface.
  • the adhesion promoter layer further increases the inherently good adhesion of the polymer coating to the oxidized tin surface of the tinplate.
  • the tinned steel sheet is heated to temperatures above the melting temperature of the tin coating (232 ° C.) during the lamination of the polymer film.
  • the tin coating of the tinplate is melted, so that at least the near-surface areas of the tin coating of the tinplate are in the molten state during the lamination of the polymer film. This further improves the adhesion between the (molten) tin surface of the steel sheet and the laminated polymer coating.
  • the polymer material of the polymer coating is expediently a thermoplastic polyester, in particular polyethylene terephthalate (PET).
  • PET polyethylene terephthalate
  • the melting point of polyethylene terephthalate is in the range of 260-270 ° C.
  • a multilayer plastic film for forming the polymer coating which has an antiblocking layer on its upper side.
  • an antiblocking layer may be formed, for example, by a silicon oxide layer on top of the polymer film.
  • the processes according to the invention can be carried out in strip-tinning plants in which a steel strip is moved by means of a transport device at a strip speed of preferably more than 200 m / min and more preferably of more than 500 m / min through a tinning device, around one or both sides of the steel strip electrolytically coated with a tin coating.
  • the subsequent electrochemical oxidation of the tin surface is carried out in an oxidation device preferably by passing the tinned steel strip at the belt speed through an electrolytic bath with an aqueous electrolyte, wherein the steel strip is suitably connected as an anode to electrochemically (anodically) oxidize the tin surface.
  • the polymer coating is applied to the oxidized tin surface of the running steel strip in a plastic coating device, for which purpose preferably by means of laminating rollers on one or both sides a polymer film is laminated onto the oxidized tin surface.
  • the tinning device and the oxidation device are arranged one behind the other in the belt running direction and preferably so close to each other that at the typical belt speeds of more than 200 m / min within a very short time and preferably within a few seconds after the tin coating, the tinned surface of the steel belt can be electrochemically oxidized ,
  • Starting material for the process according to the invention for the production of a polymer coating coated tinplate is preferably a hot rolled and unalloyed or low-alloyed sheet steel (steel strip) with a low carbon content of, for example, 20 to 900 ppm.
  • the alloy components of the steel suitably meet the requirements of the international standard ASTM A 623-11 (Standard Specification for Tin Mill Products), whereby a use of the tinplates according to the invention produced for the production of food packaging is ensured.
  • ASTM A 623-11 Standard Specification for Tin Mill Products
  • the hot-rolled steel strip is first pickled in a (not shown) pickling plant, then rinsed and dried and then cold-rolled in a cold rolling mill.
  • the steel strip is rolled to a thickness of less than 1.0 mm (thin sheet) and preferably to thicknesses of 0.1 to 0.5 mm (fine sheet).
  • the steel strip is first passed through a continuous annealing furnace in which the steel strip is heated to temperatures of 550 ° C to 700 ° C to recrystallize the steel to anneal.
  • the recrystallizing annealing reestablishes the formability of the cold rolled steel strip.
  • the steel strip may be dressed or regrooved in a post-rolling mill if necessary to achieve the forming properties necessary for the intended processing purposes. When re-rolling, if necessary, a required further reduction in the thickness of the steel strip can be achieved. After the temper rolling or rolling, the steel strip is cleaned by an alkaline electrolytic treatment and by pickling with subsequent rinsing.
  • the steel strip 10 as in FIG. 1 shown schematically, guided by a tinning 7.
  • the steel strip 10 is unwound as a continuous belt from a roll 12 and moved by a conveyor 6 at a belt speed of preferably more than 200 m / min and up to 750 m / min through a tank 7a with a tin-containing electrolyte and carried out as a cathode between tin anodes ,
  • the tin of the anodes is dissolved and deposited on the steel strip as a tin coating.
  • the tin can be deposited in any thickness and, if necessary, on both sides of the steel strip 10.
  • the thickness of the applied tin layer is regularly between 0.5 g / m 2 and 12 g / m 2 . However, it is also possible to coat the steel strip with thinner or thicker tin layers.
  • the tin surface of the tin-plated steel strip 10 is electrochemically oxidized in an oxidizer 8.
  • the freshly tinned steel strip 10 is, for example, passed into an electrolysis bath with an acidic, chromium-free and aqueous electrolyte and connected as an anode.
  • the fresh tin surface of the tinned steel strip 10 is anodically polarized.
  • a tin oxide layer having a layer thickness in the nm range is formed on the tin surface of the tin-plated steel strip, which consists essentially of tetravalent tin oxide (SnO 2 ).
  • This tetravalent tin oxide is much more inert to divalent tin oxide (SnO) that forms when tinned steel sheet is stored in an oxygen atmosphere.
  • This (essentially tetravalent and inert) tin oxide layer which forms during the electrochemical oxidation of the freshly tinned surface, ensures high resistance of the tinned steel strip surface against corrosion and reaction with sulfur.
  • the thin tin oxide layer of essentially tetravalent tin oxide (SnO 2 ) prevents, in particular, unimpeded growth of further (bivalent) tin oxide upon contact of the tinned surface with atmospheric oxygen.
  • the electrochemical oxidation of the tin surface takes place, for example, as anodic oxidation of the tinned steel strip 10 in soda solution, i. in an aqueous sodium carbonate solution.
  • the tin-plated steel strip is moved further at the strip speed and passed through an electrolytic bath 8a with a soda solution.
  • the concentration of sodium carbonate in the soda solution is preferably 1 wt .-% to 10 wt .-%, preferably 2 wt .-% to 8 wt .-%, preferably 3 wt .-% to 7 wt .-%, especially 4 Wt .-% to 6 wt .-%, in particular about 5 wt .-%.
  • the oxidation device 8 for the electrochemical oxidation of the surface of the tin coating expediently comprises an electrolytic bath 8a with a vertical tank which is filled with the electrolyte. Near the bottom is inside the vertical tank one Deflection arranged over which the tinned steel strip 10 is deflected. Between the tinned steel strip 10 and the counter electrode (eg, a steel cathode) in the vertical tank, a potential is applied.
  • the amount of charge Q transferred during the electrochemical oxidation is preferably below 40 C / m 2 .
  • the current density prevailing in the electrolysis bath is preferably in the range from 1.0 A / dm 2 to 3 A / dm 2 .
  • the thickness of the thereby forming tin oxide layer is preferably less than 100 nm and is particularly preferably of the order of 10 nm.
  • the anodization time corresponds to the residence time of the tinned steel strip in the electrochemical oxidation bath (electrolyte bath). This is predetermined by the length of the electrolyte bath or its fill level as well as the anode length and the belt speed and is advantageously in the range of 0.1 s to 1 s, in particular between 0.1 s and 0.7 s, preferably in the typical belt speeds Range from 0.15s to 0.5s, and ideally 0.2s.
  • the fill level can be used to set the anodization time to suitable values, depending on the belt speed, in order to form the preferred layer thickness of the electrochemically produced tin oxide layer.
  • the distance between the steel strip 10 and the counter electrode in the electrolytic 8a is set due to the system. It is, for example, in the range of 3 to 15 cm, preferably in the range of 5 to 10 cm and in particular by 10 cm.
  • the temperature of the electrolyte is preferably in the range of 30 to 60 ° C, in particular in the range of 35 to 50 ° C.
  • the current density in the electrolysis bath is set, for example, in the range from 1.0 to 3 A / dm 2 , preferably 1.3 to 2.8 A / dm 2 , and in particular by 2.4 A / dm 2 .
  • the total amount of charge moves in the range between 0.2 C and 0.4 C and is preferably, for example, 0.3 C.
  • the corresponding charge densities are in the range of 0.2 C / dm 2 to 0.4 C / dm 2 .
  • the tin-plated steel strip 10 is guided into a plastic coating device 9 after the electrochemical oxidation of the tin surface at a maximum strip speed of 200 m / min. Since the steel strip can not be performed by the plastic coating device with the high belt speeds of about 750 m / min, which are driven when tinning the steel strip in the tinning, it is expedient the process step of Polymer coating separately, ie to carry out with previous rolling of the tinned steel strip to a coil and intermediate storage of the coil. This is easily possible since the tin surface is resistant to a (further) unhindered growth of a (divalent) tin oxide layer due to the electrochemical oxidation.
  • a polymer coating is applied to one or both sides of the tinned steel strip.
  • the steel strip is first heated in a heater 11, which may be formed, for example.
  • a heater 11 which may be formed, for example.
  • induction heating or as infrared or microwave heating to temperatures which are at least above the melting temperature of the tin (232 ° C).
  • the temperature of the steel strip 10 during application of the polymer coating is also above the melting temperature of the polymer material.
  • the polymer material is preferably polyethylene terephthalate (PET having a melting point of approx.
  • the heated steel strip 10 is supplied in the plastic coating device 9 on one or both sides of a film 16 made of a polymer material and pressed by (suitably heated) laminating rollers 9a to the surface of the tin coating.
  • the polymer film 16 may be a film of a polyester such as polyethylene terephthalate and in particular a biaxially oriented or amorphous polyester film or a film of polypropylene or else a film of a polymer laminate consisting of polyethylene terephthalate and polypropylene and polyethylene. If necessary, a polymer film with a primer layer is used, which will follow is described.
  • a multilayer polymer film 16 for forming the polymer coating which has an antiblocking layer on its upper side.
  • an antiblocking layer may be formed, for example, by a silicon oxide layer on top of the polymer film.
  • the tin and polymer coated steel strip 10 undergoes cooling to about 20 ° C. Thereafter, the polymer coating can optionally be completely melted and then quenched in a cooling device 15 (for example a water bath) to a temperature below the glass transition point.
  • a cooling device 15 for example a water bath
  • an amorphous structure is formed in the polyethylene terephthalate or a minimal crystalline structure in the polypropylene.
  • the melting of the polymer coating is carried out particularly expediently by re-heating the steel strip 10 to temperatures above the melting point of the polymer material used in a melting device 14.
  • the plastic coating of the polymer coating takes place expediently in the melting device 14 by induction heating of the steel strip 10 in an induction coil 14a.
  • This reheating residual stresses in the polymer coating are broken down by relaxation, which leads to an increase in the adhesion between the tin coating and the polymer coating and, as a result, to a stabilization of the composite of these layers.
  • the relaxation time is less than 0.5 seconds, so that a brief heating of the polymer coating to temperatures above the PET melt temperature (about 260 ° C) is sufficient to provide the desired relaxation.
  • An induction coil 14a extending in the melting device 14 over less than 1 meter along the strip running direction is sufficient thus inductively heat the steel strip 10 in this section and thereby melt the polymer coating.
  • the subsequent quenching of the molten polymer coating in the cooling device 15 can be done, for example, by air cooling or by immersing the steel strip in a tank with cooling liquid.
  • the coated steel strip 10 is wound on a roller 13 by the transport device 6.
  • FIG. 2 a correspondingly manufactured tinplate is shown in section. This comprises the layers of steel sheet 1, tin coating 2, tin oxide layer 3 and the polymer coating 4 (for example of PET).
  • the tinplates produced according to the invention are distinguished by high corrosion resistance, which is achieved by the metallic corrosion protection layer made of tin and the polymer coating.
  • the thin iron-tin alloy layer which is formed when the tin-plated steel strip is heated to temperatures above the tin melting point between the steel strip surface and the tin layer, also contributes to the corrosion resistance.
  • the combination of these anticorrosive layers is particularly advantageous because the release of tin ions from the tin coating is avoided when exposed to air by the polymer coating. Because of the polymer coating, the tinplates produced according to the invention are also inert towards aggressive and, in particular, acidic filling products and are therefore very well suited for the production of packaging for such filling products.
  • the tinplates according to the invention have a high brilliance due to the glossy surface of the tin coating, which results from a complete melting of the tin coating. This is particularly advantageous when using transparent or translucent polymer coatings, because the tinplate thereby has an optically very attractive glossy surface.
  • the inventive method is further characterized in that they are completely free of chromium, ie, no chromium-containing substances are used.
  • the steel strips produced according to the invention are further distinguished by a very good adhesion of the polymer coating to the tin coating, which is already achieved without adhesion promoters or additional adhesive layers due to the oxidized tin surface.
  • the additional use of primer layers between the tin coating and the polymer coating is only required for special applications where very high forming rates occur.
  • Suitable adhesion promoters are glycol modified polyethylene terephthalate (PETG wherein less than 50% of the diol component is cyclohexadimethanol), glycol modified polycyclohexylenedimethylene terephthalate (PCTG wherein more than 50% of the diol component is cyclohexadimethanol) and / or isophthalic acid (IPA). Coupling agents which have a proportion of PETG and 5 to 25% by volume of IPA or PCTG have proven to be particularly preferred.
  • PETG glycol modified polyethylene terephthalate
  • PCTG glycol modified polycyclohexylenedimethylene terephthalate
  • IPA isophthalic acid
  • a multilayered polymer film which contains a polymer layer (for example of PET) and an adhesion promoter layer of one of the abovementioned materials.
  • a polymer layer for example of PET
  • adhesion promoter layer of one of the abovementioned materials.
  • Such polymer films are available as coextruded films, wherein the thickness of the adhesion promoter layer in the range of 3 to 6 microns with a total thickness of the polymer film from 10 to 40 microns.
  • This multilayered polymer film is oriented toward the tin surface for application of the polymer coating with the adhesion promoter layer and is thus laminated onto the oxidized tin surface.
  • a correspondingly manufactured tinplate is shown in section. This includes the layers steel sheet 1, tin coating 2, tin oxide layer 3 and the laminated Polymer coating with the adhesion promoter layer 5 and the polymer layer 4 (for example made of PET).
  • the tinplates produced according to the invention are suitable for the production of packaging containers, in particular for foodstuffs and for technical filling goods, such as e.g. Two-piece cans (deep-drawn and stretched, DWI cans) and aerosol cans. Canned hulls of three-piece cans are also possible if the polymer coating in the welding area is removed before the core is welded. Parts of such packaging containers may also be made from the steel strips made in accordance with the invention, e.g. Flap tapes, valve plates, can ends and cover rings.
  • the process according to the invention can also be used for the production of steel sheets for use in other fields, such as e.g. for the production of sheet metal for the construction sector or for the production of household appliances.
  • the invention is not limited to the described embodiments.
  • a roll coil
  • application of the polymer coating This is in the schematic representation of the device according to the invention FIG. 1 not considered.
  • the polymer coating may also be applied to the tin coating by other than laminating methods.
  • a molten polymer material can be applied to the oxidized tin coating, as described, for example, in the patent DE 197 30 893 C1 is described.

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  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Organic Chemistry (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Materials Engineering (AREA)
  • Metallurgy (AREA)
  • Electrochemistry (AREA)
  • Mechanical Engineering (AREA)
  • Laminated Bodies (AREA)
  • Electroplating Methods And Accessories (AREA)
  • Other Surface Treatments For Metallic Materials (AREA)
  • Containers Having Bodies Formed In One Piece (AREA)
  • Application Of Or Painting With Fluid Materials (AREA)
EP14171749.6A 2013-09-09 2014-06-10 Fer-blanc revêtu d'une couche polymère et son procédé de fabrication Active EP2845929B1 (fr)

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RS20171217A RS56605B1 (sr) 2013-09-09 2014-06-10 Beli lim obložen polimernim slojem i postupak za njegovu proizvodnju
PL14171749T PL2845929T3 (pl) 2013-09-09 2014-06-10 Biała blacha powlekana powłoką polimerową i sposoby jej wytwarzania

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DE102013109801.0A DE102013109801B4 (de) 2013-09-09 2013-09-09 Mit einer Polymerbeschichtung beschichtetes Weißblech und Verfahren zu dessen Herstellung

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JP (1) JP6231447B2 (fr)
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BR (1) BR102014018213B1 (fr)
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EP3133187A1 (fr) * 2015-08-21 2017-02-22 ThyssenKrupp Rasselstein GmbH Procede de traitement thermique d'une tole noire revetue d'une couche de conversion
WO2017001283A3 (fr) * 2015-06-29 2017-03-16 Andritz Ag Dispositif et procédé de fabrication d'une bande d'acier galvanisé

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DE102015217627B4 (de) 2015-09-15 2017-07-20 Thyssenkrupp Ag Bandbearbeitungsvorrichtung sowie Verfahren zur Bearbeitung eines Bands
DE102017108403B4 (de) * 2017-04-20 2021-05-06 Thyssenkrupp Ag Verfahren zum Beschichten eines Stahlbands
KR102176342B1 (ko) * 2018-09-28 2020-11-09 주식회사 포스코 전기강판 제품의 제조 방법
US20230023925A1 (en) * 2019-12-20 2023-01-26 Tata Steel Ijmuiden B.V. Method for manufacturing laminated tinplate, a laminated tinplate produced thereby and use thereof
DE202020100524U1 (de) * 2020-01-31 2021-05-04 Thyssenkrupp Rasselstein Gmbh Verpackungsblecherzeugnis, insbesondere Weißblech oder elektrolytisch verchromtes Stahlblech
DE102020102381A1 (de) * 2020-01-31 2021-08-05 Thyssenkrupp Rasselstein Gmbh Verpackungsblecherzeugnis, insbesondere Weißblech oder elektrolytisch verchromtes Stahlblech und Verfahren zur Herstellung eines Verpackungsblecherzeugnisses
DE102020102382A1 (de) 2020-01-31 2021-08-05 Thyssenkrupp Rasselstein Gmbh Stahlblech mit einem Oberflächenprofil mit periodisch wiederkehrenden Strukturelementen und Verfahren zur Herstellung eines solchen Stahlblechs
BR112022014404A2 (pt) * 2020-03-13 2022-09-13 Tata Steel Ijmuiden Bv Método para passivação de uma folha de flandres e aparelho para produzir a referida tira de folha de flandres passivada
US20210395851A1 (en) * 2020-06-17 2021-12-23 Axalta Coating Systems Ip Co., Llc Coated grain oriented electrical steel plates, and methods of producing the same

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EP3133187A1 (fr) * 2015-08-21 2017-02-22 ThyssenKrupp Rasselstein GmbH Procede de traitement thermique d'une tole noire revetue d'une couche de conversion

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EP2845929B1 (fr) 2017-09-27
PL2845929T3 (pl) 2018-04-30
US20150072167A1 (en) 2015-03-12
RU2590546C2 (ru) 2016-07-10
JP6231447B2 (ja) 2017-11-15
JP2015078427A (ja) 2015-04-23
RU2014135734A (ru) 2016-03-27
CN104415899A (zh) 2015-03-18
PT2845929T (pt) 2017-12-15
RS56605B1 (sr) 2018-02-28
DE102013109801B4 (de) 2020-07-09
DE102013109801A1 (de) 2015-03-12
ES2647519T3 (es) 2017-12-22
BR102014018213A2 (pt) 2015-09-29
NO3033327T3 (fr) 2018-06-02
BR102014018213B1 (pt) 2021-12-21
CN104415899B (zh) 2017-05-24

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