EP2325353A1 - 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
EP2325353A1
EP2325353A1 EP10189269A EP10189269A EP2325353A1 EP 2325353 A1 EP2325353 A1 EP 2325353A1 EP 10189269 A EP10189269 A EP 10189269A EP 10189269 A EP10189269 A EP 10189269A EP 2325353 A1 EP2325353 A1 EP 2325353A1
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EP
European Patent Office
Prior art keywords
metal wire
coating
layer
coated metal
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Withdrawn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
EP10189269A
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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 NV
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.)
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Publication date
Application filed by Van Merksteijn Quality Wire NV filed Critical Van Merksteijn Quality Wire NV
Priority to EP10189269A priority Critical patent/EP2325353A1/fr
Publication of EP2325353A1 publication Critical patent/EP2325353A1/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Withdrawn legal-status Critical Current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
    • 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
    • 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
    • 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
    • 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 a method for manufacturing a 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.
  • the present invention further relates to a coated metal wire and structures comprising one or more coated metal wires according to the present invention.
  • a metal wire refers to a single, usually cylindrical, string of metal which is used to bear mechanical loads.
  • the 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 wire is prepared.
  • metal wires 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, nickel for a heat resistance.
  • Zinc coatings are often applied to the 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 a method 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 method of the present invention is a method that only requires short contact times with the coating solutions, thereby providing a very fast coating method. Furthermore method of the present invention provides 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.
  • Another 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.
  • Another important aspect of the method of the present invention is that the method allows 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 a method for producing a coated metal wire 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:
  • the present invention also relates to a coated metal wire 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 said radial inner layer is a zinc layer, said radial central layer is a passivation layer comprising trivalent chromium and cobalt and said radial outer layer is a sealer layer comprising a synthetical polymer.
  • the present invention also relates to a structure comprising one or more coated metal wires according to the present invention.
  • the present invention relates in general to a method 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 method of the present invention is a method that only requires short contact times with the coating solutions, thereby providing a very fast coating method. Furthermore method of the present invention provides 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.
  • Another 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.
  • Another important aspect of the method of the present invention is that the method allows 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 a method for producing a coated metal wire 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 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 method according to the invention comprises 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 speed comprised in the range from about 10 to about 500 m/min, more preferably at a speed comprised in the range from about 25 to about 250 m/min and most preferably at a speed 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 method 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 method of the present invention provides that said metal wire is conveyed at a speed comprised in the range from about 10 to about 500 m/min.
  • the method for conveying the metal wire through the process of the present invention may refer to any type of conveying method 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 method according to the present invention preferably uses 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 comprising trivalent chromium ions, cobalt ions and nitrate ions, thereby providing a coating layer onto said galvanized metal wire and 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 method refers to a method 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.
  • the present invention provides a method for producing a coated metal wire wherein the residence time of said galvanized metal wire in said passivation solution ranges between 15 and 60 seconds, preferably between 25 and 35 seconds and preferably is about 30 seconds.
  • the method according to the present invention provides a high quality passivation coating on the galvanized metal wire, and this only after a short contact time between the passivation solution and the galvanized metal wire.
  • the present invention refers to a method according to the invention, wherein the temperature of said passivation solution ranges between 40°C and 100°C, preferably between 50°C and 90°C and more preferably between 60°C and 80°C.
  • the temperature of said passivation solution may for instance be about 60, 61, 62, 63, 64, 65, 66, 67, 68, 69, 70, 71, 72, 73, 74, 75, 76, 77, 78, 79 or 80°C.
  • the pH of said passivation solution ranges between 1.0 and 3.0, more preferably between 1.3 and 2.5 and most preferably between 1.6 and 1.8.
  • the passivation solution comprises trivalent chromium ions, cobalt ions and nitrate ions.
  • said passivation solution is an aqueous solution.
  • the passivation solution according to the present invention is free or essentially free of hexavalent chromium.
  • hexavalent chromium (Cr(VI)) is a toxic and carcinogenic compound, the use of Cr(VI) is avoided in the passivation solution according to the present invention.
  • the present invention relates to a method according to the present invention wherein said passivation solution comprises trivalent chromium ions in a concentration ranging between 1 g/L and 100 g/L, preferably between 5 g/L and 75 g/L, more preferably between 10 g/L and 60 g/L, more preferably between 15 g/L and 50 g/L and most preferably between 20 g/L and 45 g/L.
  • Said passivation solution may further comprise cobalt ions in a concentration ranging between 0.005 g/L and 5 g/L, preferably between 0.01 g/L and 3 g/L, and more preferably between 0.02 g/L and 2.5 g/L.
  • the passivation solution according to the present invention may comprise trivalent chromium ions in a concentration of about 20, 21, 22, 23, 24, 25, 26, 27, 28, 29, 30, 31, 32, 33, 34, 35, 36, 37, 38, 39, 40, 41, 42, 43, 44, or 45 g/L and cobalt ions in a concentration of about 0.02, 0.05, 0.075, 0.1, 0.2, 0.25, 0.5, 0.75, 1.0, 1.25, 1.5, 1.75, 2.0, 2.25 or 2.5 g/L.
  • the passivation solution according to the present invention is an aqueous solution comprising compounds such as chromium trichloride, chromium nitrate and/or cobalt nitrate.
  • said passivation solution comprises between 10% and 20% of chromium trichloride, between 1% and 3% of chromium nitrate and between 0.01% and 1% of cobalt nitrate.
  • the present invention refers to a method according to the present invention wherein said passivation solution comprises coloring agents.
  • said passivation solution comprises coloring agents.
  • the coated metal wire according to the invention may be colored. 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 such as black, blue, yellow, olive, green and red may be obtained.
  • coloring agents colors such as black, blue, yellow, olive, green and red may be obtained.
  • a metal wire with a black color chromiting passivation solution may be used.
  • 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.
  • 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 comprising trivalent chromium and cobalt.
  • 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 synthetical polymer and a non-ionic surfactant, 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 method refers to a method of providing the coated metal wire with an outer coating layer for withstanding aggressive environments.
  • the sealing coating is giving the coated metal wire another 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 refers to a method according to the present invention wherein said sealer solution comprises a synthetical polymer and a non-ionic surfactant.
  • the sealer solution comprises a synthetical polymer and a non-ionic surfactant.
  • said sealer solution is an aqueous solution.
  • the passivation solution according to the present invention is free or essentially free of chromium.
  • the sealing coating is preferably applied from an aqueous solution comprising a synthetical polymer and non-ionic surfactant.
  • the synthetical polymer is preferably a polyethylene polymer such as, but not limited polystyrene, polyvinyl chloride (PVC), polyethylene co-vinylacetate, polyacrylic acid, and styrene.
  • the sealing coating according to the present invention may also comprise a copolymer based on an alkene, acrylic acid, butyl, acrylate, 2-ethylhexyl acrylate, methyl acrylate, ethyl acrylate, acrylonitrile, methyl methacrylate, and/or TMPTA.
  • the aqueous solution comprises a copolymer of ethylene and acrylic acid.
  • other copolymers such as a copolymer of styrene and acrylic acid can be used. It is important to notice that the aqueous solution comprising the copolymer based on an alkene and acrylic acid is chromium free or substantially chromium free.
  • the non-ionic surfactant refers to a wetting agent that lowers the surface tension of a solution, allowing easier spreading, and lowers the interfacial tension between two solutions.
  • Non-limitative examples of non-ionic surfactant include alkyl poly(ethylene oxide), alkylphenol poly(ethylene oxide), copolymers of poly(ethylene oxide) and poly(propylene oxide), alkyl polyglucosides including octylglucoside and decylmaltoside, fatty alcohols including cetylalcohol and oleylalcohol, cocamide MEA, cocamide DEA, polysorbates such as Tween 20 and Tween 80, dodecyl dimethylamine oxide, isotridecanol ethoxylate and/or benzisothiazolinone.
  • the present invention provides a method according to the present invention wherein the residence time of said passivated metal wire with 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 a method 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 a fast and low-cost method 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 method according to the present invention results 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 method for producing a coated metal wire according to the present invention comprises the subsequent steps of:
  • the present invention also relates to a coated metal wire 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 said radial inner layer is a zinc layer, said radial central layer is a passivation layer comprising trivalent chromium and cobalt and said radial outer layer is a sealer layer comprising a synthetical polymer.
  • the present invention relates to a 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 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 coated metal wire according to the present invention may be provided in any color, depending on the coloring agents or pigments in the central and/or outer layer.
  • the inventors have also observed for the 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 coated metal wire according to the present invention, wherein said radial inner layer comprises essentially zinc and/or wherein said radial central layer has a chromium content, and preferably a trivalent chromium content, ranging between 93.00% and 99.96% and a cobalt content ranging between 0.04% and 7.00%.
  • the present invention relates to a coated metal wire according to the present invention, wherein said radial central layer is free or essentially free of hexavalent chromium.
  • the present invention relates to a 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 coated metal wires according to the present invention.
  • Said structure comprising one or more 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 laboraties 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 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 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 coating layers allowing the coated wires to have a specific color, and this without affecting the other characteristics of the coated metal wire.
  • the present invention also relates to the use of a one or more 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 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 method 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 more than 200 hours.
  • corrosion of the coated metal wire according to the present invention was only observed after submitting the coated metal wire to said neutral salt spray test for more than 500 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)
  • Chemical Kinetics & Catalysis (AREA)
  • Engineering & Computer Science (AREA)
  • Materials Engineering (AREA)
  • Mechanical Engineering (AREA)
  • Metallurgy (AREA)
  • Organic Chemistry (AREA)
  • General Chemical & Material Sciences (AREA)
  • Ropes Or Cables (AREA)
  • Application Of Or Painting With Fluid Materials (AREA)
EP10189269A 2009-10-29 2010-10-28 Procédé de production d'un fil métallique revêtu Withdrawn EP2325353A1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
EP10189269A EP2325353A1 (fr) 2009-10-29 2010-10-28 Procédé de production d'un fil métallique revêtu

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
EP09174452 2009-10-29
EP10189269A EP2325353A1 (fr) 2009-10-29 2010-10-28 Procédé de production d'un fil métallique revêtu

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EP2325353A1 true EP2325353A1 (fr) 2011-05-25

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EP (1) EP2325353A1 (fr)
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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2024172796A1 (fr) * 2023-02-14 2024-08-22 Uysal Makina Sanayi Ithalat Ihracat Ve Ticaret Anonim Sirketi Revêtement à efficacité anticorrosion élevée et procédé d'application dudit revêtement sur des substrats

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2144773A (en) * 1983-07-19 1985-03-13 Omi Int Corp Non-peroxide trivalent chromium passivation
EP1484432A1 (fr) * 2002-03-14 2004-12-08 Dipsol Chemicals Co., Ltd. Solution de traitement pour la formation d'un revetement chimique exempt de chrome hexavalent noir sur un substrat recouvert de zinc ou d'alliage de zinc, et procede de formation de revetement chimique exempt de chrome hexavalent noir sur un substrat recouvert de zinc ou d'alliage de zinc
KR100790269B1 (ko) * 2006-12-21 2008-01-02 한국선재(주) 아연도금 철선 및 강선용 백청 방지제의 조성물 및 상기방지제를 이용하여 아연도금 철선 및 강선을 제조하는 방법

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2144773A (en) * 1983-07-19 1985-03-13 Omi Int Corp Non-peroxide trivalent chromium passivation
EP1484432A1 (fr) * 2002-03-14 2004-12-08 Dipsol Chemicals Co., Ltd. Solution de traitement pour la formation d'un revetement chimique exempt de chrome hexavalent noir sur un substrat recouvert de zinc ou d'alliage de zinc, et procede de formation de revetement chimique exempt de chrome hexavalent noir sur un substrat recouvert de zinc ou d'alliage de zinc
KR100790269B1 (ko) * 2006-12-21 2008-01-02 한국선재(주) 아연도금 철선 및 강선용 백청 방지제의 조성물 및 상기방지제를 이용하여 아연도금 철선 및 강선을 제조하는 방법

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2024172796A1 (fr) * 2023-02-14 2024-08-22 Uysal Makina Sanayi Ithalat Ihracat Ve Ticaret Anonim Sirketi Revêtement à efficacité anticorrosion élevée et procédé d'application dudit revêtement sur des substrats

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