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US20150072167A1 - Tinplate, coated with a polymer coating, and methods for its production - Google Patents

Tinplate, coated with a polymer coating, and methods for its production Download PDF

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Publication number
US20150072167A1
US20150072167A1 US14/480,683 US201414480683A US2015072167A1 US 20150072167 A1 US20150072167 A1 US 20150072167A1 US 201414480683 A US201414480683 A US 201414480683A US 2015072167 A1 US2015072167 A1 US 2015072167A1
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Prior art keywords
tin
coating
polymer coating
polymer
tinplate
Prior art date
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US14/480,683
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English (en)
Inventor
Kathleen Stein-Fechner
Tanja Lommel
Reiner Sauer
Beate BANNEMANN
Petra DIEDERICH
Benjamin Liebscher
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ThyssenKrupp Rasselstein GmbH
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ThyssenKrupp Rasselstein GmbH
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Assigned to THYSSENKRUPP RASSELSTEIN GMBH reassignment THYSSENKRUPP RASSELSTEIN GMBH ASSIGNMENT OF ASSIGNORS INTEREST (SEE DOCUMENT FOR DETAILS). Assignors: Stein-Fechner, Kathleen, Dr., SAUER, REINER, DR., LIEBSCHER, BENJAMIN, Diederich, Petra, Lommel, Tanja, Dr., Bannemann, Beate, Dr.
Publication of US20150072167A1 publication Critical patent/US20150072167A1/en
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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 disclosure concerns a tinplate, coated with a polymer coating, and methods for its production and an apparatus for carrying out the methods.
  • Tinplate is a thin, cold-rolled steel sheet, whose surface is coated with tin.
  • the application of the tin coating on the steel sheet is, as a rule, carried out electrolytically.
  • Tinplate is mainly used for the production of packagings, in particular, cans for food products for human consumption and pet food, packagings for chemical-technical goods, aerosol cans, beverage cans, and for the production of parts for such packagings, such as closures, lashing belts, valve plates, can lids, and lid rings.
  • Tinplate is characterized by a high corrosion resistance and stability with respect to acids and by a good formability.
  • the tinplate surface is also provided with a lacquer or a polymer coating so as to guarantee an additional protection, in addition to the protection from corrosion provided by the tin coating.
  • a plastic surface made of polyethylene terephthalate (PET) or polypropylene (PP), for example, is applied on the tinplate.
  • Film-coated tinplate is suitable, in particular, for the production of valve plates, bottoms of aerosol cans, tear-off lids for cans, and deep-drawn containers and vacuum closures.
  • tin-plated steel sheets are known, which are coated with a polyester resin film, in particular made of polyethylene terephthalate (PET).
  • PET polyethylene terephthalate
  • the coating of the tinplate surface with the polyester resin film is thereby 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 on the tinplate surface before laminating on the polyester resin film; it is formed, for example, by a monolayer of hydrated chromium oxide or by a double layer of metal chromium with an overlying layer of hydrated chromium oxide.
  • the polyester resin film in particular, a PET film, would be detached from the tinplate, in particular during the formations in the methods for the production of packagings or during sterilizing operations with the packages or when filling them with hot goods.
  • the chromium packagings used for the production of the chromium-containing adhesive layer are, however, toxic and dangerous for the environment.
  • electrolytically chromium-plated steel sheets are known from the state of the art (Electrolytic Chromium Coated Steel, ECCS).
  • ECCS Electrolytic Chromium Coated Steel
  • This material which is also designated as “Tin-Free Steel (TFS),” is found as cold-rolled steel sheets that have been electrolytically equipped with a coating of chromium and chromium oxide.
  • TFS Tin-Free Steel
  • the surface of this material has a good adhesion for polymer materials, such as for polyethylene terephthalate or polypropylene, and thus can be coated with this polymer, for example, by laminating a polymer film so as to allow an additional corrosion protection.
  • the adhesion of the polymer coating on the chromium surface of the ECCS or the TFS withstands even strong deformations, such as, for example, during the production of packaging containers and during sterilization processes.
  • ECCS sheets equipped with polymer coatings are therefore used, in particular, in production methods for containers in which strong deformations of the sheets are necessary, such as, for example, during the production of valve plates for aerosol cans, wherein the organic coating with the ECCS takes place before the formation process, because otherwise, strong wear and tear of the tools occurs.
  • a chromium coating against a corrosion-protected steel strip (ECCS or TFS) is known, on which a film made of polyethylene terephthalate was laminated.
  • Such steel sheets which are protected against corrosion with a chromium coating, also prove to be disadvantageous, however, because of the toxicity of the chromium compounds used in the production process, in particular the liquid chromic acid (chromium VI) of the refinement bath.
  • chromium VI liquid chromic acid
  • a corrosion-resistant steel sheet that has a metal corrosion protection layer, which may be, by way of example, an electrolytically applied tin- or chromium oxide layer on which a transparent polymer film is applied, on one or both sides, by laminating on a polymer film.
  • the polymer film consists thereby of polyethylene terephthalate (PET), polyvinyl chloride (PVC), or polypropylene (PP).
  • An adhesion promoter in particular an adhesive layer, is thereby provided between the metal corrosion protection layer of the steel sheet and the laminated polymer film.
  • a steel sheet which is galvanically coated with a metal corrosion protection layer and passivated, with a thickness between 0.05 mm and 0.5 mm, is used and heated to temperatures of approximately 160° C.
  • the polymer film is laminated on the heated steel sheet by means of rotating rollers.
  • the thickness of the laminated polymer film is between 5 and 100 ⁇ m.
  • the polymer film thereby has, preferably on one side, an adhesive layer that has a lower melting point than the polymer material of the polymer film.
  • the polymer film is laminated on, oriented with the adhesive layer toward the surface of the metal corrosion protection layer of the steel sheet.
  • embodiments of the disclosure provide as complete as possible a chromium-free method for the production of a highly corrosion-resistant steel sheet.
  • the highly corrosion-resistant steel sheet produced with the method should be suitable especially for the production of packagings and should not suffer any damage with regard to corrosion resistance even with strong deformations during the production process and during a sterilization operation of the produced packaging.
  • the disclosure also provides an apparatus for carrying out the disclosed methods as well as a tinplate made according to the disclosed methods. Preferred embodiments of the methods, apparatus, and tinplate are also disclosed.
  • the chromium-free tin surface of the tin-plated steel sheet is first electrochemically oxidized in a first step and, in a second step, a polymer coating is applied on the oxidized tin surface.
  • a chromium-free passivation of the tin surface is guaranteed, which prevents an unhindered increase of tin oxide on the tinplate surface.
  • the passivation of the tinplate surface in the method in accordance with the disclosure takes place without a use of chromium-containing substances, in particular without the use of toxic and environmentally detrimental chromium oxides.
  • this chromium-free passivation of the tinplate surface by an electrochemical oxidation not only prevents an unhindered increase of tin oxide on the tinplate surface, but at the same time also forms a good adhesion basis for polymers.
  • a polymer coating can be applied without any problems on the oxidized tin surface of the tinplate, wherein the oxidized tin surface allows a very good adhesion of the polymer coating. It has become evident that the adhesion between the oxidized tin surface and the polymer coating withstands even strong deformations, as occur, for example, in methods for the production of cans with multiple deep-drawing or in the production of valve plates. The adhesion between the oxidized tin surface and the polymer coating also readily withstands a sterilization operation without a detachment of the polymer coating from the tinplate surface occurring during the sterilization.
  • a tin coating is first electrolytically deposited 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 on the oxidized surface of the tin coating.
  • the electrochemical oxidation of the tin surface is thereby preferably carried out immediately 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 hereby preferably takes place also without additional intermediate steps, in particular without an intermediate cleaning or a temperature treatment of the tinplate surface.
  • the electrochemical oxidation of the tin surface can, in particular, take place by anodic polarization of the tin-plated steel sheet in an aqueous and chromium-free electrolyte.
  • the electrochemical oxidation of the tin surface can be carried out by immersion of the tinplate into a soda solution (sodium carbonate solution).
  • a thin tin oxide layer which essentially consists of tetravalent tin oxide (SnO 2 ), thereby forms on the (chromium-free) tin surface of the tinplate.
  • the electrochemical oxidation of the tinplate surface After the electrochemical oxidation of the tinplate surface, it is provided with a polymer coating, wherein the polymer coating appropriately has a thickness in the range of 10 to 100 ⁇ m and is preferably applied by the lamination of a polymer film on the oxidized tin surface. It is particularly appropriate for this to use a coextruded plastic film with a polymer layer and an adhesion promoter layer, which is laminated on the oxidized tin surface of the steel sheet in that the adhesion promoter layer of the plastic film is laid on the oxidized tin surface and is laminated on with the effect of heat, by means of lamination rolls or lamination rollers. The adhesion promoter layer further increases the adhesion of the already effective adhesion of the polymer coating on the oxidized tin surface of the tinplate.
  • the polymer material of the polymer coating is appropriately 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.
  • the tin-plated steel sheet is kept in the temperature range between 270° C. and 290° C., and preferably at approximately 280° C., when the polymer coating is applied.
  • a multilayer plastic film that has an antiblock layer on its upper side for the formation of the polymer coating.
  • an antiblock layer can, for example, be formed by a silicon oxide layer on the upper side of the polymer film.
  • the method in accordance with the disclosure can be carried out in strip tin-plating units, wherein a steel strip is moved, by means of a transporting device, at a strip speed of preferably more than 200 m/min, and with particular preference more than 500 m/min, through a tin-plating device.
  • the following electrochemical oxidation of the tin surface is carried out in an oxidation device, preferably by conducting the tin-plated steel strip at the strip speed through an electrolysis bath with an aqueous electrolyte, wherein the steel strip is thereby appropriately connected as an anode so as to oxidize the tin surface electrochemically (anodically).
  • the polymer coating is applied on the oxidized tin surface of the moving steel strip in a plastic coating device, for the purpose of laminating a polymer film on the oxidized tin surface, on one or both sides, preferably by means of laminating rolls.
  • the tin-plating device and the oxidation device are thereby arranged one behind the other as seen in the moving direction of the strip, and preferably so close to one another that at the typical strip speeds of more than 200 m/min, within a very short time, and preferably within a few seconds after the tin coating, the tin-plated surface of the steel strip can be electrochemically oxidized.
  • FIG. 1 Schematic representation of an apparatus for carrying out the method in accordance with the disclosure for the production of tinplate coated with a polymer coating;
  • FIG. 2 schematic representation of a tinplate in accordance with the disclosure with a polymer coating without an adhesion promoter layer;
  • FIG. 3 schematic representation of a tinplate in accordance with the disclosure with a polymer coating with an adhesion promoter layer.
  • the starting material for the method in accordance with the disclosure for the production of a tinplate coated with a polymer coating is preferably a hot-rolled and unalloyed or low-alloy steel sheet in the form of a strip (steel strip) with a low carbon content of, for example, 20 to 900 ppm.
  • the alloy components of the steel appropriately fulfill the specifications of the International Standard ASTM A 623-11 (Standard Specification for Tin Mill Products), wherein a use of the tinplates produced in accordance with the disclosure for the production of packagings for food for human consumption is ensured.
  • all steel types that have a composition suitable for the production of fine or very fine sheets can be used for the method in accordance with the disclosure.
  • the hot-rolled steel strip is first pickled in a pickling unit (not shown), subsequently rinsed and dried, and then cold-rolled in a cold rolling device.
  • the steel strip is thereby rolled to a thickness of less than 1.0 mm (fine sheet) and preferably to thicknesses of 0.1 to 0.5 mm (very fine sheet).
  • the steel strip is first conducted through a continuous annealing furnace, in which the steel strip is heated to temperatures of 550° C. to 700° C., for the recrystallizing annealing of the steel.
  • the formability of the cold-rolled steel strip is, once again, produced by the recrystallizing annealing.
  • the steel strip After the recrystallization annealing, the steel strip can be finished or temper-rolled in a temper-rolling mill, if required for the production of the forming characteristics needed for the planned processing purposes. During the temper-rolling, a required further thickness reduction of the steel strip can also be attained under certain circumstances. After the finishing or temper-rolling, a cleaning of the steel strip is carried out by means of an alkaline electrolytic treatment and by pickling with a subsequent rinsing.
  • the steel strip 10 is conducted through a tin-plating device 7 .
  • the steel strip 10 is thereby unwound from a roll 12 as a continuous strip and moved through a transporting device 6 at a strip speed of preferably more than 200 m/min and up to 750 m/min, through a tank 7 a with a tin-containing electrolyte, and conducted, 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 thereby be deposited in any thickness and, if required, 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, a coating of the steel strip with thinner or with thicker tin layers is also possible.
  • the tin surface of the tin-plated strip 10 is oxidized electrochemically in an oxidation device 8 .
  • the freshly tin-plated steel strip 10 is conducted, for example, into an electrolyte bath with an acidic, chromium-free and aqueous electrolyte and connected as an anode. In this way, the fresh tin surface of the tin-plated steel strip 10 is anodically polarized.
  • a thin oxide layer is thereby formed, with a layer thickness in the nm range, on the tin surface of the tin-plated steel strip, which essentially consists of tetravalent tin oxide (SnO 2 ).
  • This tetravalent tin oxide is substantially more inert than divalent tin oxide (SnO), which is formed during the storage of tin-plated steel sheets in an oxygen atmosphere.
  • SnO divalent tin oxide
  • the thin tin oxide layer essentially consisting of tetravalent tin oxide (SnO 2 ), particularly prevents an unhindered increase of additional (divalent) tin oxide upon contact of the tin-plated surface with air oxygen.
  • the electrochemical oxidation of the tin surface is carried out, for example, as an anodic oxidation of the tin-plated steel strip 10 in soda solution, that is, in an aqueous sodium carbonate solution.
  • the tin-plated steel strip is moved at the strip speed and conducted through an electrolysis bath 8 a with a soda solution.
  • the concentration of sodium carbonate in the soda solution is preferably 1 wt % to 10 wt %, primarily 2 wt % to 8 wt %, preferably 3 wt % to 7 wt %, above all 4 wt % to 6 wt %, in particular approximately 5%.
  • the oxidation device 8 for the electrochemical oxidation of the surface of the tin coating appropriately comprises an electrolysis bath 8 a with a vertical tank, which is filled with the electrolyte. In the vicinity of the bottom, within the vertical tank, there is a deflection roller, via which the tin-plated steel strip 10 is deflected. A potential is placed between the tin-plated steel strip 10 and the counter-electrode (for example, a steel cathode) in the vertical tank.
  • the charge quantity Q, transferred during the electrochemical oxidation, is thereby preferably below 40 C/m 2 .
  • the current density that prevails in the electrolysis bath is preferably in the range of 1.0 A/dm 2 to 3 A/dm 2 .
  • the density of the tin oxide layer that is thereby being formed is preferably lower than 100 nm and is, with particular preference, in the order of magnitude of 10 nm.
  • the anodization time corresponds to the residence time of the tin-plated steel strip in the electrochemical oxidation bath (electrolyte bath). This is specified by the length of the electrolyte bath or its filling level and the anode length and the strip speed and, at the typical strip speeds, is expediently in the range of 0.1 sec to 1 sec, in particular between 0.1 sec and 0.7 sec, preferably in the range of 0.15 sec to 0.5 sec, and ideally around 0.2 sec. Via the filling level, it is possible to adjust the anodization time to suitable values as a function of the strip speed, so as to form the preferred layer thickness of the electrochemically produced tin oxide layer.
  • the tin-plated steel strip 10 is conducted into a plastic coating device 9 after the electrochemical oxidation of the tin surface, at a strip speed of a maximum 200 m/min. Since the steel strip cannot be conducted through the plastic coating device at the high strip speeds of approximately 750 m/min that are used during the tin plating of the steel strip in the tin-plating device, it is expedient to carry out the method step of the polymer coating separately, that is, with a prior winding up of the tin-plated steel strip into a coil and the intermediate storage of the coil.
  • the temperature of the steel strip 10 is also above the melting temperature of the polymer material during the polymer coating.
  • the polymer material is polyethylene terephthalate (PET with a melting temperature between approximately 235 and 260° C., dependent on the degree of crystallization and on the degree of polymerization) or polypropylene (PP with a melting temperature of approximately 160° C.) or also PE (with a melting temperature of approximately 130-145° C.).
  • a thin and very dense alloy layer is formed between the steel strip surface and the tin layer, which consists of iron atoms of the steel and tin atoms of the tin coating.
  • This alloy layer leads to a very good adhesion of the tin coating on the steel strip surface and represents, moreover, a very effective corrosion barrier. With a complete melting of the tin coating, moreover, a shiny surface of the tin layer is also produced.
  • a film 16 made of a polymer material is supplied to the heated steel strip 10 , and by means of (appropriately heated) lamination rolls 9 a is pressed onto the surface of the tin coating, on one or both sides, in the plastic coating device 9 .
  • the polymer film 16 can be a film made of a polyester, such as polyethylene terephthalate and in particular a biaxially oriented or amorphous polyester film or a film made of polypropylene or also a film made of a polymer laminate consisting of polyethylene terephthalate and polypropylene and polyethylene. If necessary, a polymer film with an adhesion promoter layer is used, which will be described below.
  • the tin- and polymer-coated steel strip 10 undergoes a cooling to approximately 20° C. Afterward, optionally, the polymer coating can still be completely melted and then quenched to a temperature below the glass transition point in a cooling device 15 (for example, a water bath). In this way, for example, an amorphous structure is formed in the polyethylene terephthalate or a minimal crystalline structure in the polypropylene when using PET or PP as the polymer material.
  • the melting of the polymer coating is thereby carried out in a particularly appropriate manner by another heating of the steel strip 10 to temperatures above the melting point of the used polymer material in a melting device 14 .
  • an induction coil 14 a for example, which extends over less than 1 meter along the direction of movement of the strip in the melting device, is sufficient for the purpose, so as to thus heat the steel strip 10 inductively in this section and, in this way, to melt the polymer coating.
  • the subsequent quenching of the melted polymer coating in the cooling device 15 can take place, for example, by an air cooling or by immersing the steel strip into a tank with a cooling liquid.
  • the coated steel strip 10 is wound up on a roll 13 by the transporting device 6 .
  • FIG. 2 shows a correspondingly produced tinplate. This comprises the layers steel sheet 1 , tin coating 2 , tin oxide layer 3 , and the polymer coating 4 (for example, made of PET).
  • the tin plates produced in accordance with the disclosure are characterized by a high corrosion resistance, which is attained by the metal corrosion protection layer made of tin and the polymer coating.
  • the thin iron-tin alloy layer also contributes thereby to the corrosion resistance; it is formed between the steel strip surface and the tin layer during the heating of the tin-plated steel strips to temperatures above the tin melting point.
  • the combination of these corrosion protection layers is thereby particularly advantageous, because with the polymer coating, the release of tin ions from the tin coating due to the effect of air is avoided.
  • the tinplates produced in accordance with the disclosure are also inert with respect to aggressive and, in particular, acid-containing goods because of the polymer coating and are therefore very suitable for the production of packagings for such goods.
  • the tinplates in accordance with the disclosure exhibit a high degree of luster because of the shiny surface of the tin coating that forms during a complete melting of the tin coating. This is advantageous, in particular, when using transparent or translucent polymer coatings, because the tinplate thus has an optically very attractive shiny surface.
  • the methods in accordance with the disclosure are also characterized in that they are completely chromium-free-—that is, no chromium-containing substances are used.
  • the steel strips produced in accordance with the disclosure are also characterized by a very good adhesion of the polymer coating on the tin coating, which, as a result of the oxidized tin surface, is also already attained without an adhesion promoter or additional adhesion layers.
  • adhesion promoter layers between the tin coating and the polymer coating is necessary only for special applications in which very high deformation rates appear.
  • PTG polyethylene terephthalate
  • PCTG glycol-modified polycyclohexylenedimethylene terephthalate
  • IPA isophthalic acid
  • a multilayer polymer film is appropriately used that contains a polymer layer (for example, made of PET) and an adhesion promoter layer made of one of the materials mentioned above.
  • a polymer layer for example, made of PET
  • an adhesion promoter layer made of one of the materials mentioned above.
  • Such polymer films are available as co-extruded films, wherein the thickness of the adhesion promoter layer is in the range of 3 to 6 ⁇ m with a total thickness of the polymer film of 10 to 40 ⁇ m.
  • This multilayer polymer film is oriented toward the tin surface for the application of the polymer coating with the adhesion promoter layer and is thus laminated on the oxidized tin surface.
  • the tinplates produced in accordance with the disclosure are suitable for the production of packaging containers, in particular for food and for technical goods, such as two-part cans (deep-drawn and stretched, DWI cans), and aerosol cans.
  • can bodies of three-part cans can be taken into consideration, if the polymer coating in the welding area is removed before the body welding.
  • parts of such packaging containers can be made from the steel strips produced in accordance with the disclosure, such as lashing belts, valve plates, can lids, and lid rings.
  • the method in accordance with the disclosure can also be used for the production of steel sheets for use in other areas, such as for the production of sheets for the construction area or for the production of household appliances.
  • the polymer coating can also be applied on the tin coating by coating methods other than lamination.
  • a molten polymer material can be applied on the oxidized tin coating as is described, for example, in Patent DE 197 30 893 C1.
  • a polymer coating made of PET can be applied on the upper side of the tin-plated steel strip, and a polymer coating made of PP can be applied on the underside of the strip.
  • a polymer coating (PP or PET) can also be thereby replaced by a lacquering.

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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)
  • Application Of Or Painting With Fluid Materials (AREA)
  • Containers Having Bodies Formed In One Piece (AREA)
US14/480,683 2013-09-09 2014-09-09 Tinplate, coated with a polymer coating, and methods for its production Abandoned US20150072167A1 (en)

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

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EP (1) EP2845929B1 (pt)
JP (1) JP6231447B2 (pt)
CN (1) CN104415899B (pt)
BR (1) BR102014018213B1 (pt)
DE (1) DE102013109801B4 (pt)
ES (1) ES2647519T3 (pt)
NO (1) NO3033327T3 (pt)
PL (1) PL2845929T3 (pt)
PT (1) PT2845929T (pt)
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WO2021151652A1 (de) * 2020-01-31 2021-08-05 Thyssenkrupp Rasselstein Gmbh Verpackungsblecherzeugnis mit strukturierter oberflächeund verfahren zur herstellung eines solchen verpackungsblecherzeugnisses
WO2021180980A1 (en) * 2020-03-13 2021-09-16 Tata Steel Ijmuiden B.V. Method for passivating a tinplate strip and apparatus for producing said passivated tinplate strip
WO2021257608A1 (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
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

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US10695789B2 (en) 2015-09-15 2020-06-30 Thyssenkrupp Ag Strip processing device and method for processing a strip
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
WO2021151652A1 (de) * 2020-01-31 2021-08-05 Thyssenkrupp Rasselstein Gmbh Verpackungsblecherzeugnis mit strukturierter oberflächeund verfahren zur herstellung eines solchen verpackungsblecherzeugnisses
WO2021180980A1 (en) * 2020-03-13 2021-09-16 Tata Steel Ijmuiden B.V. Method for passivating a tinplate strip and apparatus for producing said passivated tinplate strip
CN115279950A (zh) * 2020-03-13 2022-11-01 塔塔钢铁艾默伊登有限责任公司 钝化镀锡钢带材的方法和生产所述钝化的镀锡钢带材的设备
US12359337B2 (en) 2020-03-13 2025-07-15 Tata Steel Ijmuiden B.V. Method for passivating a tinplate strip and apparatus for producing said passivated tinplate strip
WO2021257608A1 (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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BR102014018213B1 (pt) 2021-12-21
JP2015078427A (ja) 2015-04-23
JP6231447B2 (ja) 2017-11-15
ES2647519T3 (es) 2017-12-22
PT2845929T (pt) 2017-12-15
DE102013109801B4 (de) 2020-07-09
EP2845929A1 (de) 2015-03-11
BR102014018213A2 (pt) 2015-09-29
PL2845929T3 (pl) 2018-04-30
RU2014135734A (ru) 2016-03-27
EP2845929B1 (de) 2017-09-27
DE102013109801A1 (de) 2015-03-12
CN104415899B (zh) 2017-05-24
NO3033327T3 (pt) 2018-06-02
CN104415899A (zh) 2015-03-18
RS56605B1 (sr) 2018-02-28
RU2590546C2 (ru) 2016-07-10

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