EP2371984A1 - Procédé de production d'un fil métallique revêtu - Google Patents

Procédé de production d'un fil métallique revêtu Download PDF

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Publication number
EP2371984A1
EP2371984A1 EP10159047A EP10159047A EP2371984A1 EP 2371984 A1 EP2371984 A1 EP 2371984A1 EP 10159047 A EP10159047 A EP 10159047A EP 10159047 A EP10159047 A EP 10159047A EP 2371984 A1 EP2371984 A1 EP 2371984A1
Authority
EP
European Patent Office
Prior art keywords
metal wire
coated metal
coating
layer
wire
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.)
Withdrawn
Application number
EP10159047A
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German (de)
English (en)
Inventor
Francis Emmers
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
VAN MERKSTEIJN STEEL HOLDING B.V.
Original Assignee
Van Merksteijn Quality Wire Belgium
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Van Merksteijn Quality Wire Belgium filed Critical Van Merksteijn Quality Wire Belgium
Priority to EP10159047A priority Critical patent/EP2371984A1/fr
Priority to BE2010/0281A priority patent/BE1019329A3/nl
Publication of EP2371984A1 publication Critical patent/EP2371984A1/fr
Withdrawn legal-status Critical Current

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    • C—CHEMISTRY; METALLURGY
    • C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
    • C23C—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THE SURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTION; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL
    • C23C2/00—Hot-dipping or immersion processes for applying the coating material in the molten state without affecting the shape; Apparatus therefor
    • C23C2/34—Hot-dipping or immersion processes for applying the coating material in the molten state without affecting the shape; Apparatus therefor characterised by the shape of the material to be treated
    • C23C2/36—Elongated material
    • C23C2/38—Wires; Tubes
    • 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
    • B05D1/18—Processes for applying liquids or other fluent materials performed by dipping
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05D—PROCESSES FOR APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05D7/00—Processes, other than flocking, specially adapted for applying liquids or other fluent materials to particular surfaces or for applying particular liquids or other fluent materials
    • B05D7/20—Processes, other than flocking, specially adapted for applying liquids or other fluent materials to particular surfaces or for applying particular liquids or other fluent materials to wires
    • C—CHEMISTRY; METALLURGY
    • C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
    • C23C—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THE SURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTION; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL
    • C23C2/00—Hot-dipping or immersion processes for applying the coating material in the molten state without affecting the shape; Apparatus therefor
    • C23C2/26—After-treatment
    • 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
    • C23C22/05—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 using aqueous solutions
    • C23C22/06—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 using aqueous solutions using aqueous acidic solutions with pH less than 6
    • C23C22/48—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 using aqueous solutions using aqueous acidic solutions with pH less than 6 not containing phosphates, hexavalent chromium compounds, fluorides or complex fluorides, molybdates, tungstates, vanadates or oxalates
    • C23C22/53—Treatment of zinc or alloys based thereon
    • C—CHEMISTRY; METALLURGY
    • C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
    • C23C—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THE SURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTION; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL
    • 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
    • C23C22/82—After-treatment
    • C23C22/83—Chemical after-treatment
    • 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
    • C25D11/04—Anodisation of aluminium or alloys based thereon
    • C25D11/18—After-treatment, e.g. pore-sealing
    • C25D11/24—Chemical after-treatment
    • C25D11/246—Chemical after-treatment for sealing layers
    • 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
    • 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
    • C25D7/0607—Wires
    • 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
    • C23C2222/00—Aspects relating to chemical surface treatment of metallic material by reaction of the surface with a reactive medium
    • C23C2222/10—Use of solutions containing trivalent chromium but free of hexavalent chromium

Definitions

  • the present invention relates to methods for manufacturing a weldable coated metal wire comprising a metal core surrounded by a coating, wherein the coating comprises a zinc inner layer, a passivation layer and a sealing layer comprising silicon compounds.
  • the present invention further relates to a weldable coated metal wire and structures comprising one or more weldable coated metal wires according to the present invention.
  • Metal wire is an important raw material in industry and construction. Several metals and metallic alloys possess the physical properties necessary to make useful wire. The metals must in the first place be ductile and strong in tension, the quality on which the utility of wire principally depends.
  • the metals suitable for wire, possessing almost equal ductility, are platinum, silver, iron, copper, aluminium, steel and gold; and it is only from these and certain of their alloys with other metals, principally brass and bronze, that metal wire is prepared.
  • metal wire may be provided with various metallic coatings in order to add functionalities to the metal wire or in order to enhance its properties.
  • Known metallic coatings on a metal wire are brass for adhesion with rubber, zinc or a zinc-aluminum alloy for corrosion resistance, and nickel for a heat resistance.
  • Zinc coatings are often applied to metal wire by means of a hot dip process. Passivating and sealing coatings are also often used to increase the corrosion resistance of the metal wire.
  • Spraying a coating onto a metal wire provides a coating which is not uniformly spread on the wire. Also, problems such as the occurrence of foam in the coating solution make the coating procedure difficult as the consistence of the coating would vary.
  • Both spray coating and dip coating are also processes which are hard to incorporate in an in-line process. Dip coating requires a step where the process is stopped to apply the coating, whereas spraying affects greatly the speed of the process. Especially when applying a complex coating, comprising different coating layers, onto a metal wire, dip coating as well as spray coating are unsuited to be incorporated into the in-line process where the metal wire is continuously conveyed at a constant velocity through the different process steps.
  • the present invention aims to provide a method allowing the manufacturing of a coated metal wire, wherein a metal wire is subjected to at least three coating processes.
  • the present invention aims to provide a method for producing a coated metal wire with a high quality. Additionally the coating provided onto the metal wire according to the present invention provides the metal wire with specific beneficial characteristics including an improved resistance to corrosion, good welding properties and good ductility.
  • the present invention relates in general to methods for manufacturing a coated metal wire. More specifically, the coated metal wire comprises a metal core (1) surrounded by a coating (2), wherein the coating (2) comprises three layers: an inner layer (3), a central layer (4) and an outer layer (5) as indicated in Figure 1 .
  • the different layers of the coating are applied by guiding a metal wire through a series of successive baths comprising coating solutions. By guiding the metal wire through the series of successive baths comprising coating solutions, different coating layers may be applied onto the metal wire, thereby providing the wire with improved characteristics.
  • the inventors have found that the methods of the present invention are methods that only require short contact times with the coating solutions, thereby providing a very fast coating method. Furthermore the methods of the present invention provide a coated metal wire with a high quality.
  • the coated metal wire is characterized by having a high corrosion resistance, thereby increasing the lifetime of the coated metal wire, or constructions comprising the coated metal wire.
  • a further important feature of the coated metal wire according to the present invention is that the coating of the wire does not affect the welding properties of the wire and improves the wear-resistance of the wire.
  • a further important aspect of the methods of the present invention is that the methods allow the introduction of coloring agents into the coating of the wire.
  • the color of coated metal wires in the prior art was restricted to a limited number of colors due to the fact that the introduction of some color, such as for instance a black color, affects the welding characteristics of the coated metal wire.
  • coloring agents may be introduced thereby providing coated metal wires with a great variety of colors, including black coated metal wires, and this without affecting the other characteristics of the coated metal wire.
  • the coated metal wire according to the present invention remains flexible and deformable without distorting the coating layer.
  • the present invention provides methods for producing a coated metal wire, which is preferably weldable, comprising a metal core and a coating comprising a radial inner layer, a radial outer layer and a radial central layer arranged between said inner and outer layer, wherein the methods comprise the steps of:
  • the present invention also relates to a weldable coated metal wire comprising a metal core and a coating layer comprising a radial inner layer, a radial outer layer and a radial central layer arranged between said inner and outer layer, wherein said radial inner layer is a zinc layer, said radial central layer is a passivation layer and said radial outer layer is a sealer layer comprising silicon compounds and optionally coloring agents.
  • the present invention also relates to the use of a one or more weldable coated metal wires according to the present invention in a metal structure.
  • Figure 1 schematically illustrates a cross-section of the coated metal wire according to the present invention.
  • the present invention relates in general to methods for manufacturing a coated metal wire.
  • metal wire refers to a single, usually cylindrical, string of metal which is used to bear mechanical loads.
  • the coated metal wire comprises a metal core (1) surrounded by a coating (2), wherein the coating (2) comprises three layers: an inner layer (3), a central layer (4) and an outer layer (5) as indicated in Figure 1 .
  • the different layers of the coating are applied by guiding a metal wire through a series of successive baths comprising coating solutions.
  • the methods of the present invention are methods that only require short contact times with the coating solutions, thereby providing a very fast coating method.
  • the methods of the present invention provide a coated metal wire with a high quality.
  • the coated metal wire is characterized by having a high corrosion resistance, thereby increasing the lifetime of the coated metal wire, or constructions comprising the coated metal wire.
  • a further important feature of the coated metal wire according to the present invention is that the coating of the wire does not affect the welding properties of the wire and improves the wear-resistance of the wire.
  • a further important aspect of the methods of the present invention is that the methods allow the introduction of coloring agents into the coating of the wire. Whereas the color of coated metal wires in the prior art was restricted to a limited number of colors due to the fact that the introduction of some color, such as for instance a black color, affects the welding characteristics of the coated metal wire.
  • coloring agents may be introduced thereby providing coated metal wires with a great variety of colors, including black coated metal wires, and this without affecting the other characteristics of the coated metal wire. Also the coated metal wire according to the present invention remains flexible and deformable without distorting the coating layer.
  • the present invention provides methods for producing a coated metal wire, which is preferably weldable, comprising a metal core and a coating comprising a radial inner layer, a radial outer layer and a radial central layer arranged between said inner and outer layer, wherein the method comprises the steps of:
  • coated metal wire refers to a metal wire comprising a metal core surrounded by a coating.
  • the metal wire refers to a single, string of metal which may be used for a large number of applications. In fact the metal wire is an important raw material in industry and construction.
  • the metal wire may have any cross-section such as round, square, rectangular, oval or half oval cross-sections.
  • the metal wires according to the present invention may be chosen within a high diameter range ranging between 0.1 mm and 50 mm, preferably between 0.5 mm and 30 mm and more preferably between 2 mm and 16 mm.
  • the coating according to the present invention has a thickness between 0.1 ⁇ m and 50 ⁇ m, preferably between 0.5 ⁇ m and 30 ⁇ m and more preferably between 2 ⁇ m and 16 ⁇ m.
  • the material of the metal core may be any type of metal or metallic alloy such as, platinum, silver, iron, copper, aluminium, gold, steel, brass or bronze.
  • the material of the metal core is steel or iron.
  • the steel may provided with either a low or high carbon content.
  • the inner layer of the coating refers to the portion of coating at the interface with the metal core.
  • the outer layer of the coating refers to the portion of coating intended to be on the outside of the coated metal wire.
  • the central layer of the coating refers to the portion of the coating arranged between the inner and the outer layer.
  • the methods according to the invention comprise at least three steps where a metal wire is guided or conveyed through a bath containing a coating solution.
  • the metal wire is conveyed along a predetermined path in a continuous manner, preferably at a velocity comprised in the range from about 10 to about 500 m/min, more preferably at a velocity comprised in the range from about 25 to about 250 m/min and most preferably at a velocity comprised in the range from about 50 to about 200 m/min.
  • the conveying rate of the metal wire may for instance be about 50, 60, 70, 75, 80, 90, 100, 110, 120, 130, 140, 150, 160, 170, 180, 190 or 200 m/min.
  • the conveying rate of the metal wire in the methods according to the present invention remains substantially constant through the entire process. This refers to the continuous manner by which the metal wire is conducted through each of the coating solutions.
  • the methods of the present invention provides that said metal wire is conveyed in at least steps (a), (b) and (c) at a velocity comprised in the range from about 10 to about 500 m/min.
  • the methods for conveying the metal wire through the process of the present invention may refer to any type of conveying methods known in the art.
  • the device for conveying the metal wire comprises at least one device for feeding the metal wire into a series of coating baths and a device for receiving the coated metal wire.
  • the residence time of the metal wire in each of the coating solutions may be calculated.
  • the metal core wire is conveyed or guided in a continuous manner through a galvanization solution comprising zinc, thereby providing a zinc coating layer onto said metal core wire and obtaining a galvanized metal wire.
  • this process step is referred to as the galvanization step in which a zinc coating layer is applied onto the metal core wire.
  • This galvanization step may occur using any of the galvanization methods known in the art, including hot-dip galvanization or electrolytic galvanization with zinc.
  • the methods according to the present invention preferably use electrolytic galvanization.
  • the metal core wire is guided through a molten bath of zinc at a temperature of about 460 °C.
  • pure zinc reacts with oxygen to form zinc oxide, which further reacts with carbon dioxide to form zinc carbonate which protect the metal core against corrosion.
  • the galvanized metal wire may first be subjected to a polishing step before applying the other coating layers onto the galvanized metal wire.
  • This polishing step may include a wire drawing pass.
  • Wire drawing is a metalworking process used to reduce the diameter of a wire or for polishing purposes by pulling the wire through a single, or series of, drawing die(s). Drawing is preferably performed at room temperature, but it may be performed at elevated temperatures for large wires.
  • Electrolytic galvanization may occur either through an alkaline or acidic electrolytic galvanization process in which the metal wire is first loaded with an electrical charge before guiding the wire through the galvanization solution comprising zinc. Electrolytic galvanization does not require elevated temperatures of the galvanization solution, the temperature of the galvanization solution ranges between 60 and 75 °C.
  • the electrolyte is an alkaline solution comprising zinc.
  • a zinc-containing alkaline solution comprising for instance NaOH and ZnO may be used for this process.
  • an acidic electrolytic galvanization process the electrolyte is an acidic solution comprising zinc.
  • an acidic galvanization solution may comprise zinc sulfide or zinc chloride. Other additives may be added to the electrolytic galvanization solution to improve the quality of the coating.
  • an electrolytic galvanization provides additional benefits to the applied zinc coating.
  • the coating is found to be more easily applied onto the metal wire without requiring extensive maintenance of the equipment.
  • the thickness of the zinc coating may be controlled more accurately when using electrolytic galvanization.
  • the zinc coating is found to have a greater adherence to the metal core as well as improve the adherence of the next coating layer.
  • an electrolytic galvanization process provides a high quality galvanized metal wire does not require wire drawing steps.
  • galvanized metal wire refers to a metal wire comprising a metal core surrounded by a zinc coating.
  • the thickness of the zinc coating layer ranges between 0.1 ⁇ m and 50 ⁇ m, preferably between 1 ⁇ m and 25 ⁇ m and more preferably between 2 ⁇ m and 15 ⁇ m.
  • the galvanized metal wire is conveyed or guided in a continuous manner through a passivation solution.
  • This process step provides a coating layer onto said galvanized metal wire thereby obtaining a passivated metal wire.
  • this process step is referred to as the passivation step in which a coating layer is applied onto the galvanized metal wire.
  • This passivation step may occur using any of the passivation methods known in the art, and preferably by guiding the galvanized metal wire through a passivating solution.
  • the passivation solution typically comprises compounds such as cobalt, trivalent chromium, hexavalent chromium, iron, nickel, molybdenum, manganese, lanthanum, lanthanide, or mixtures thereof dissolved in solutions such as chromates, molybdates, etc. Additionally, the passivating solution may optionally further comprise halide ions including fluoride, chloride and bromide ions as well as one or more compatible wetting agents. Preferably, the passivation solution comprises trivalent chromium ions, cobalt ions and nitrate ions.
  • the passivation methods refers to methods of making the galvanized metal wire "passive" thereby reducing the reactivity of a chemically active metal surface by immersion in a passivating solution.
  • the passivation solution oxidizes and dissolves any impurities on the surface of the galvanized metal wire thereby removing any impurities. Passivation leads to the spontaneous formation of a hard non-reactive surface film that inhibits further corrosion.
  • passivated metal wire refers to a metal wire comprising a metal core surrounded by a zinc inner coating layer, which is surrounded by a passivation coating layer.
  • the thickness of the passivation coating layer ranges between 50 nm and 750 nm, preferably between 100 nm and 600 nm, more preferably between 150 nm and 500 nm and more preferably between about 200 nm and 400 nm.
  • the passivated metal wire is conveyed or guided in a continuous manner through a sealer solution comprising a silicon compound and optionally coloring agents, thereby providing a sealer coating onto said passivated metal wire and obtaining the coated metal wire according to the present invention.
  • this process step is referred to as the sealing step in which a coating layer is applied onto the passivated metal wire.
  • This sealing step may occur using any of the sealing methods known in the art, and preferably by guiding the passivated metal wire through a sealing solution.
  • the sealing methods refer to methods of providing the coated metal wire with an outer coating layer for withstanding aggressive environments.
  • the sealing coating is giving the coated metal wire a further coating layer for corrosion resistance. This can be explained by the closed structure of the sealing coating and by the intrinsic inert properties of the sealer.
  • the present invention provides methods for producing a weldable coated metal wire wherein the residence time of said passivated metal wire in said sealer solution according to step (c) ranges between 15 and 60 seconds and preferably between 25 and 35 seconds and more preferably 30 seconds.
  • the methods according to the present invention provides a high quality sealer coating on the passivated metal wire, and this only after a short contact time between the sealer solution and the passivated metal wire.
  • the present invention refers to methods according to the invention, wherein the temperature of said sealer solution is at room temperature or preferably ranges between 15°C and 35°C.
  • the temperature of said sealer solution may for instance be about 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 26, 27, 28, 29, 30, 31, 32, 33, 34 or 35°C.
  • the pH of said sealer solution ranges between 8.0 and 10.0, more preferably between 8.5 and 9.5 and most preferably between 8.9 and 9.3.
  • the present invention provides methods for producing a weldable coated metal wire wherein said sealer solution comprises silicon compounds.
  • Said silicon compounds are preferably organic and/or inorganic silicon compound wherein said inorganic silicon compound is preferably chosen from the group comprising a silicate such as sodium silicate, potassium silicate, magnesium silicate, cobalt silicate, sodium metasilicate, potassium metasilicate, calcium metasilicate, silicic acid or metasilicic acid, and wherein said organic silicon compound is chosen from the group comprising silicon compound containing carbon silicon bonds such as organosilanes, siloxides, silyl halides, silyl hydrides, silenes, siloles and/or hypercoordinated silicon and preferably C1 to C6 alkyl silanes, silicon oil, ethyl silicate, silyl acetals, silanols, siloxanes, polysiloxanes, silyl ethers, trimethylsilyl chloride, dichloromethylphenylsilane, dimethyldichlorosilane, methyltrichlorosilane, (4-aminobuty
  • said sealer solution is SurTec 556 RT TM (Suretec), PLUS ® L, VL, ML, M or XL seal coatings (Dacral), Sealer 300 W (Atotech) or Sealer 350 W (Atotech). More preferably, according to a particular embodiment, the present invention relates to methods according to the present invention wherein said sealer solution comprises silicon compounds in a concentration ranging between 0.01 g/L and 10 g/L, preferably between 0.05 g/L and 5 g/L, more preferably between 0.1 g/L and 5 g/L.
  • the present invention relates to methods according to the present invention wherein said coated metal wire obtained from step (c) is submitted to a heat treatment.
  • the heat treatment refers to any type of treatment considered by the skilled person that would increase the temperature of the coated metal wire, such as exposing the coated metal wire to an external heat source such as a furnace, oven or flame, or any other heat treatment such as for instance induction, electrical heating or heat treatment using a laser beam.
  • the sealer solution according to the present invention is a solution comprising silicon compounds and coloring agents.
  • the coated metal wire according to the invention may be colored in any desired color. This results in a coated metal wire which is colored and which holds at the same time the specific characteristics of the coated metal wire such as corrosion resistance, weldability, wear resistance and ductility.
  • the colored metal wires obtained according to the present invention may pertain to the whole visible spectrum, from violet till red. Also luminescent pigments can be added.
  • coloring agents colors such as black, silver, blue, yellow, olive, green and red may be obtained.
  • Colored coated metal wires according to the present invention are also very suitable to be used for fences since they are giving a nice decorative aspect and at the same time an improved corrosion resistance. They can for example be used as barbed wire, for knotted fences, for welded fences,...
  • the coloring agents may also be applied in a separate coloring solution through which the passivated metal wire is conveyed.
  • the present invention provides methods according to the present invention wherein the residence time of said passivated metal wire in said sealer solution ranges between 0.5 and 10 seconds, preferably between 0.75 and 5 seconds and preferably between 1 and 2 seconds.
  • the coated metal wire refers to a metal wire comprising a metal core surrounded by a zinc inner coating layer, which is surrounded by a passivation central coating layer comprising trivalent chromium and cobalt, said central coating layer being surrounded with a sealing coating layer.
  • the thickness of the sealing coating layer ranges between 50 nm and 750 nm, preferably between 100 nm and 600 nm, more preferably between 150 nm and 500 nm and more preferably between about 200 nm and 400 nm.
  • the present invention refers to methods according to the present invention wherein the metal core wire is conveyed, from an initial position where a role of said metal core wire is unwinded, along a predetermined path through several treatment baths containing treatment solutions, to a final receiving position where said coated metal wire is rolled up.
  • an in-line process is generated providing fast and low-cost methods of coating a metal wire.
  • additional process steps of the metal wire such as defatting, rinsing, pickling, wire drawing and/or drying may be included.
  • the methods according to the present invention result in a simplified process.
  • the application of the coating according to the present invention can be performed in a continuous, in-line process with other process steps such as defatting, rinsing, pickling, wire drawing and/or drying. By using a continuous process, the manufacturing costs are considerably reduced.
  • a defatting process typically occurs at the beginning of the method, after unwinding the metal wire.
  • Defatting may be performed using methods commonly known in the art and for instance by using a solution of sodium hydroxide and surfactants.
  • Rinsing may be performed prior to and after the galvanization process, and after the passivation process. Rinsing may be performed using methods commonly known in the art and for instance by using an aqueous solution.
  • Pickling refers to a process step where the wire is submitted to an acidic solution just prior to the passivation step.
  • Pickling may be performed using methods commonly known in the art and for instance by using an acidic solution of nitric acid, sulfuric acid, hydrochloric acid, phosphoric acid, boric acid, hydrofluoric acid, hydrobromic acid or any other acid known in the art.
  • the drying process may be conducted at the end of the coating process, just prior to rolling up the coated metal wire. Drying of the metal wire may be performed using may be performed using methods commonly known in the art.
  • the methods for producing a coated metal wire according to the present invention comprises the subsequent steps of:
  • the present invention relates to a weldable coated metal wire obtained by or obtainable by any of the methods according to the present invention.
  • the present invention also relates to a weldable coated metal wire comprising a metal core and a coating layer comprising a radial inner layer, a radial outer layer and a radial central layer arranged between said inner and outer layer, wherein said radial inner layer is a zinc layer, said radial central layer is a passivation layer and said radial outer layer is a sealer layer comprising silicon compounds and optionally coloring agents.
  • the present invention relates to a weldable coated metal wire according to the present invention, wherein the thickness of said radial inner layer ranges between 0.1 and 50 ⁇ m, preferably between 1 ⁇ m and 30 pm, preferably between 1 ⁇ m and 25 ⁇ m and more preferably between 2 ⁇ m and 15 ⁇ m, wherein the thickness of said radial central layer ranges between 50 and 750 nm, preferably between 100 nm and 600 nm, more preferably between 150 nm and 500 nm and more preferably between about 200 nm and 400 nm, and/or wherein the thickness of said radial outer layer ranges between 50 and 750 nm, preferably between 100 nm and 600 nm, more preferably between 150 nm and 500 nm and more preferably between about 200 nm and 400 nm.
  • the weldable coated metal wire according to the present invention may be provided in any color, depending on the coloring agents or pigments in the outer layer.
  • the inventors have also observed for the weldable coated metal wire according to the present invention that the applied coating also provides an improved UV resistance to the metal wire.
  • the coated metal wire according to the present invention has been found to maintain the color. It is for instance commonly known that black passivated objects gradually loose their color and turn olive in time. This effect has not been observed for the coated metal wire according to the present invention.
  • the present invention relates to a weldable coated metal wire according to the present invention, wherein said radial inner layer comprises zinc and/or wherein said radial outer layer has a silicon content ranging between 93.00% and 100% and optionally a coloring agent content of less than 7.00%.
  • the present invention relates to weldable a coated metal wire according to the present invention, wherein said radial outer layer comprises a silicon compound.
  • the present invention relates to a weldable coated metal wire according to the present invention, wherein said metal core is made of steel.
  • the present invention also relates to a structure comprising one or more weldable coated metal wires according to the present invention.
  • Said structure comprising one or more weldable coated metal wires according to the present invention refers to a structure that may be used in construction, automotive industry, presentation displays, food industry, medical and/or laboratory products, horticulture, ventilation, lighting and other industries.
  • Non limiting examples of such structures include a fencing structures, gates, woven-wire fabrics, auto bodies and other auto components, U-bolts, towing eyes, fixing eyes and rings, guide tubes, exhaust brackets, head restraints, operating rods, and other metal wire products such as displays, racks, grids, lampshades, frames, hooks, brackets, clips, rings and springs.
  • the weldable coated metal wire according to the present invention may also be used for making a multistranded wire comprising a bundle of such coated metal wires.
  • the multistranded wire is also referred to as a wire rope.
  • the weldable coated metal wires according to the present invention have shown to require very short contact times between the metal wire and the coating solutions. Furthermore, the coating provides the metal wire with an increased corrosion resistance, wear resistance and flexibility while still maintaining a good weldability.
  • the weldability of a material refers to its ability to be welded. Many metals can be welded, but some are easier to weld than others. Weldability greatly influences weld quality and is an important factor in choosing which welding process to use. Coated metal wires of the prior art often show that by providing a coating onto the metal wire the weldability decreases. With the coated metal wire according to the present invention the weldability is not affected by the presence of the coating.
  • coloring agents may be added to the sealer layer allowing the coated wires to have a specific color, and this without affecting the other characteristics of the weldable coated metal wire.
  • the present invention also relates to the use of a one or more weldable coated metal wires according to the present invention in a metal structure.
  • the present invention more preferably relates to the use of a one or more weldable coated metal wires according to the present invention in a metal structure for use in construction and/or automotive industry.
  • Coated metal wires were manufactured according to the methods of the present invention and various characteristics were measured.
  • the corrosion resistance of the coated metal wire according to the present invention was measured using a neutral salt spray test (ISO 9227).
  • the coated metal wire according to the present invention showed a corrosion resistance in this test of about 200 hours.
  • the heat resistance of the coated metal wire according to the present invention was measured by submitting the coated metal wire to 200°C for 30 minutes and subsequently cooling the metal wire in water of 20°C. This test showed that the coating was highly resistant and no breaks or cracks were observed in the coating.
  • the climate resistance of the coated metal wire according to the present invention was measured by submitting the coated metal wire to continuously changing temperature and water saturation conditions. During this test no breaks or cracks were observed in the coating.
  • coated metal wire according to the present invention was found to have good welding properties and during bending test, wherein the coated metal wire of the present invention is spiralled around its axe, the coating remained intact.

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  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Materials Engineering (AREA)
  • Metallurgy (AREA)
  • Organic Chemistry (AREA)
  • Mechanical Engineering (AREA)
  • Electrochemistry (AREA)
  • General Chemical & Material Sciences (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Wood Science & Technology (AREA)
  • Application Of Or Painting With Fluid Materials (AREA)
  • Other Surface Treatments For Metallic Materials (AREA)
  • Ropes Or Cables (AREA)
EP10159047A 2010-04-02 2010-04-02 Procédé de production d'un fil métallique revêtu Withdrawn EP2371984A1 (fr)

Priority Applications (2)

Application Number Priority Date Filing Date Title
EP10159047A EP2371984A1 (fr) 2010-04-02 2010-04-02 Procédé de production d'un fil métallique revêtu
BE2010/0281A BE1019329A3 (nl) 2010-04-02 2010-05-07 Werkwijze voor het vervaardigen van een gecoate metaaldraad.

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Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2013117270A1 (fr) * 2012-02-06 2013-08-15 Nv Bekaert Sa Fil en acier inoxydable non magnétique faisant office de fil d'armure pour des câbles d'alimentation
WO2014163683A1 (fr) * 2013-03-12 2014-10-09 Alcoa, Inc. Substrats en alliage d'aluminium coloré résistant à la corrosion et leurs procédés de production
EP2915904A4 (fr) * 2012-10-31 2015-11-04 Jfe Steel Corp Plaque d'acier de pressage à chaud, élément de pressage à chaud et procédé de fabrication d'un élément de pressage à chaud
CN106544490A (zh) * 2016-10-28 2017-03-29 浙江康盛股份有限公司 一种制冷用复合镀锌军绿钢管及其制造方法
CN109972067A (zh) * 2019-04-25 2019-07-05 天津市萧山管业有限公司 一种电工导管及其制备方法
WO2020130833A1 (fr) * 2018-12-21 2020-06-25 Aquacare Europe B.V. Procédé pour patiner des surfaces en zinc et système associé

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GB985472A (en) * 1962-08-09 1965-03-10 Air Liquide Improvements relating to welding and to the production of steel wires for use therein
US4069187A (en) * 1974-09-12 1978-01-17 J. M. Eltzroth & Associates, Inc. Coating compositions and processes
US4664953A (en) * 1984-02-23 1987-05-12 Copas Raymond J Coating of wire or strip
US20050181137A1 (en) * 2004-02-17 2005-08-18 Straus Martin L. Corrosion resistant, zinc coated articles
WO2005075697A1 (fr) * 2004-02-04 2005-08-18 Nv Bekaert Sa Fil d'acier a haute teneur en carbone avec sous revetement de nickel
US20060054248A1 (en) * 2004-09-10 2006-03-16 Straus Martin L Colored trivalent chromate coating for zinc

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Publication number Priority date Publication date Assignee Title
GB985472A (en) * 1962-08-09 1965-03-10 Air Liquide Improvements relating to welding and to the production of steel wires for use therein
US4069187A (en) * 1974-09-12 1978-01-17 J. M. Eltzroth & Associates, Inc. Coating compositions and processes
US4664953A (en) * 1984-02-23 1987-05-12 Copas Raymond J Coating of wire or strip
WO2005075697A1 (fr) * 2004-02-04 2005-08-18 Nv Bekaert Sa Fil d'acier a haute teneur en carbone avec sous revetement de nickel
US20050181137A1 (en) * 2004-02-17 2005-08-18 Straus Martin L. Corrosion resistant, zinc coated articles
US20060054248A1 (en) * 2004-09-10 2006-03-16 Straus Martin L Colored trivalent chromate coating for zinc

Cited By (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2013117270A1 (fr) * 2012-02-06 2013-08-15 Nv Bekaert Sa Fil en acier inoxydable non magnétique faisant office de fil d'armure pour des câbles d'alimentation
CN104066863A (zh) * 2012-02-06 2014-09-24 贝卡尔特公司 作为用于电缆的铠装钢丝的非磁性不锈钢丝
US9997278B2 (en) 2012-02-06 2018-06-12 Nv Bekaert Sa Non-magnetic stainless steel wire as an armouring wire for power cables
EP2915904A4 (fr) * 2012-10-31 2015-11-04 Jfe Steel Corp Plaque d'acier de pressage à chaud, élément de pressage à chaud et procédé de fabrication d'un élément de pressage à chaud
US10030290B2 (en) 2012-10-31 2018-07-24 Jfe Steel Corporation Steel sheet for hot press-forming, hot press-formed part, and method of producing hot press-formed part
WO2014163683A1 (fr) * 2013-03-12 2014-10-09 Alcoa, Inc. Substrats en alliage d'aluminium coloré résistant à la corrosion et leurs procédés de production
CN106544490A (zh) * 2016-10-28 2017-03-29 浙江康盛股份有限公司 一种制冷用复合镀锌军绿钢管及其制造方法
WO2020130833A1 (fr) * 2018-12-21 2020-06-25 Aquacare Europe B.V. Procédé pour patiner des surfaces en zinc et système associé
NL2022279B1 (en) * 2018-12-21 2020-07-15 Aquacare Europe B V Method for patinating zinc surfaces and system therefor
CN113474480A (zh) * 2018-12-21 2021-10-01 艾库卡尔欧洲有限公司 用于使锌表面锈化的方法及其系统
CN109972067A (zh) * 2019-04-25 2019-07-05 天津市萧山管业有限公司 一种电工导管及其制备方法

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