EP1252368A1 - Tube metallique resistant a la corrosion et procede de fabrication correspondant - Google Patents

Tube metallique resistant a la corrosion et procede de fabrication correspondant

Info

Publication number
EP1252368A1
EP1252368A1 EP00908310A EP00908310A EP1252368A1 EP 1252368 A1 EP1252368 A1 EP 1252368A1 EP 00908310 A EP00908310 A EP 00908310A EP 00908310 A EP00908310 A EP 00908310A EP 1252368 A1 EP1252368 A1 EP 1252368A1
Authority
EP
European Patent Office
Prior art keywords
layer
zinc
coating
tube
nylon
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Withdrawn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
EP00908310A
Other languages
German (de)
English (en)
Inventor
Guido M. Campagna
James D. Mcdaniel
Timothy L. Schwiebert
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.)
ITT Manufacturing Enterprises LLC
Original Assignee
ITT Manufacturing Enterprises LLC
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 ITT Manufacturing Enterprises LLC filed Critical ITT Manufacturing Enterprises LLC
Publication of EP1252368A1 publication Critical patent/EP1252368A1/fr
Withdrawn legal-status Critical Current

Links

Classifications

    • 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
    • C23C28/30—Coatings combining at least one metallic layer and at least one inorganic non-metallic layer
    • C23C28/32—Coatings combining at least one metallic layer and at least one inorganic non-metallic layer including at least one pure metallic layer
    • C23C28/322—Coatings combining at least one metallic layer and at least one inorganic non-metallic layer including at least one pure metallic layer only coatings of metal elements only
    • C23C28/3225—Coatings combining at least one metallic layer and at least one inorganic non-metallic layer including at least one pure metallic layer only coatings of metal elements only with at least one zinc-based layer
    • 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
    • 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
    • C23C28/30—Coatings combining at least one metallic layer and at least one inorganic non-metallic layer
    • C23C28/34—Coatings combining at least one metallic layer and at least one inorganic non-metallic layer including at least one inorganic non-metallic material layer, e.g. metal carbide, nitride, boride, silicide layer and their mixtures, enamels, phosphates and sulphates
    • C23C28/345—Coatings combining at least one metallic layer and at least one inorganic non-metallic layer including at least one inorganic non-metallic material layer, e.g. metal carbide, nitride, boride, silicide layer and their mixtures, enamels, phosphates and sulphates with at least one oxide layer
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16L—PIPES; JOINTS OR FITTINGS FOR PIPES; SUPPORTS FOR PIPES, CABLES OR PROTECTIVE TUBING; MEANS FOR THERMAL INSULATION IN GENERAL
    • F16L58/00—Protection of pipes or pipe fittings against corrosion or incrustation
    • F16L58/02—Protection of pipes or pipe fittings against corrosion or incrustation by means of internal or external coatings
    • F16L58/04—Coatings characterised by the materials used
    • F16L58/08—Coatings characterised by the materials used by metal
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16L—PIPES; JOINTS OR FITTINGS FOR PIPES; SUPPORTS FOR PIPES, CABLES OR PROTECTIVE TUBING; MEANS FOR THERMAL INSULATION IN GENERAL
    • F16L58/00—Protection of pipes or pipe fittings against corrosion or incrustation
    • F16L58/02—Protection of pipes or pipe fittings against corrosion or incrustation by means of internal or external coatings
    • F16L58/04—Coatings characterised by the materials used
    • F16L58/10—Coatings characterised by the materials used by rubber or plastics
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16L—PIPES; JOINTS OR FITTINGS FOR PIPES; SUPPORTS FOR PIPES, CABLES OR PROTECTIVE TUBING; MEANS FOR THERMAL INSULATION IN GENERAL
    • F16L58/00—Protection of pipes or pipe fittings against corrosion or incrustation
    • F16L58/02—Protection of pipes or pipe fittings against corrosion or incrustation by means of internal or external coatings
    • F16L58/04—Coatings characterised by the materials used
    • F16L58/10—Coatings characterised by the materials used by rubber or plastics
    • F16L58/1054—Coatings characterised by the materials used by rubber or plastics the coating being placed outside the pipe
    • F16L58/109—Coatings characterised by the materials used by rubber or plastics the coating being placed outside the pipe the coating being an extruded layer

Definitions

  • This invention relates to a multi-layer coated metal tube, and more particularly to a metal tube having a primed outer surface coated with a plurality of layers of plastic material securely bonded thereto.
  • Metal pipes often have their outer surfaces covered with a protective coating. These pipes are used for conveying hydraulic fluids (such as for brakes, transmissions, power steering, fans, and the like) , fuels (such as methanol, ethanol, gasoline, additives, diesel, kerosene, jet fuel, and mixtures thereof) , vapor, and the like in a motor vehicle. As such, these pipe lines are located under the body of the vehicle. Since they are used in such a harsh environment, the pipes are required to have a high degree of corrosion resistance, scratch resistance, impact strength and mechanical wear resistance. In cold climates, it is not unusual to encounter road salt sprinkled onto road surfaces in order to prevent freezing of water on the road surfaces and the inherent dangers caused thereby.
  • FMVs Flexible fuel vehicles
  • Certain fuel blends may corrosively attack metals, even some types of stainless steel. If corrosion is prolonged, fuel and/or hazardous fluids may leak from the tubing.
  • emissions standards for example those issued by the California Air Resources Board (CARB) and the U.S. EPA, mandate no leakage or permeation for as high as 150,000 miles or 15 years.
  • a double-rolled steel pipe has been proposed that is made by rolling a steel strip or hoop twice and brazing its longitudinal edges by means of a copper plating layer, or a seam welded steel pipe, where the pipe has an outer surface coated with an electroplated zinc film.
  • the zinc film has an outer surface coated with a relatively thin special chromate film having, for example, an olive color. Chromate is typically used to enhance the adhesion of the subsequent layer by making the surface rougher.
  • the chromate film has an outer surface coated with a fluorinated resin film.
  • the fluorinated resin film is formed by impregnating the chromate film with a dispersion of polyvinyl fluoride immediately after the formation of the chromate film when it is still in the state of a gel, and drying them under heat, so that the fluorinated resin film may form an intimate bond with the chromate film.
  • the chromate film is formed by treating the pipe with a solution, it requires large amounts of a chromium compound and an organic acid, such as formic acid, used as a reducing agent . It is necessary to supply the treating solution with the chromium compound frequently, and to renew it at regular intervals of time in order to maintain a constant film forming capacity.
  • the waste solution contains a large amount of chromium having a valence of 6, which is a toxic substance. As such, the disposal of this toxic waste solution is very costly.
  • the chromate film as formed is highly resistant to corrosion, the heat to which it is exposed during the formation of the resin film deprives it of water and thereby makes it brittle. Any plastic deformation of the pipe, such as may result from bending or double flaring, and/or any elastic deformation, such as may result from pipe handling prior to or during assembly, may form fine cracks in the chromate film which lowers its rustproofing properties.
  • a corrosion resistant pipe where a metal pipe is provided with an outer surface coated with a zinc film, a chromate film, an intermediate layer consisting sequentially of an epoxy resin, and a polyvinyl fluoride film formed one on top of another in the order listed.
  • a plastic-coated steel tube has also been proposed where a steel tube has an inner layer of at least one cross-linked polyolefin modified with a hydrolyzable silane and an outer unmodified or soot- blended polyolefin layer on the exposed surface of the inner layer .
  • a process for coating metal tubes with plastic material has also been disclosed where a fixed metal tube is heated to a temperature above the melting point of the plastic material to be employed, thereafter causing a mixture of plastic powder and air to pass through the metal tube whereby the plastic material is fritted onto the inside surface of the tube, thereafter rotating the metal tube and applying to the exterior surface thereof in a plurality of stages a plastic material, the plastic material being electrostatically sprayed onto the rotating metal tube.
  • An automobile tube line for a brake, fuel or hydraulic system has also been disclosed with an interior steel tube having a galvanized exterior layer with an additional exterior olive chromated layer which is wrapped in an additional Nylon 12 layer casing where the plastic casing is a polyamide layer applied by extrusion on top of the olive chromated layer.
  • a corrosion resistant metal tube which withstands prolonged exposure to corrosive environments, including aggressively corrosive environments. It is another object of the present invention to provide such a tube and process for making the same which advantageously substantially contains any volatile organic compounds, thereby substantially preventing any undesirous venting of VOCs to the atmosphere. It is a further object of the present invention to provide a process which captures and re-uses any primer material applied to the tube, thereby advantageously substantially eliminating waste of raw material (s) and substantially preventing undesirous venting/overspray of primer to the surrounding environment.
  • the corrosion resistant metal tube and process for making according to the present invention provides numerous advantages over the prior known tubing configurations.
  • tube having a priming layer between the polymeric layer (s) and the pretreated tube promotes adherence of the polymeric layer (s), even when exposed for prolonged periods of time to aggressively corrosive environments, such as for example to 85% ethanol fluid soaks.
  • the process for applying the primer coating according to the present invention is environmentally friendly.
  • the polyamide 12 material of choice having a lower viscosity and lower molecular weight, allows for higher line speeds for more efficient and cost effective production. '
  • the multi-layer tube according to the present invention comprises a metal tube having an outer surface; a zinc layer bonded to the metal tube outer surface, wherein the zinc layer is selected from the group consisting of zinc plating, zinc nickel alloys, zinc cobalt alloys, zinc aluminum alloys, and mixtures thereof; a surface treatment layer bonded to the zinc layer, wherein the surface treatment layer is selected from the group consisting of a zinc/aluminum/rare earth O
  • Figure 3 is a further view of the paint booth used in conjunction with the closed atmosphere, airless spray system according to the present invention for applying the primer;
  • Figure 4 is a cross-sectional view of a tubing according to the present invention with the layer thicknesses exaggerated for purposes of illustration;
  • Figure 5 is a further view of the paint booth used in conjunction with the closed atmosphere, airless spray system according to the present invention for applying the primer;
  • Figure 6 is a schematic view of the closed atmosphere, airless spray system according to the present invention for applying the primer. DESCRIPTION OF THE PREFERRED AND ALTERNATIVE EMBODIMENTS
  • the multi-layer tubing 10 includes a metal tube or pipe 12.
  • the metal tube 12 may be welded steel tube, brazed steel tube, aluminum, copper or stainless steel.
  • the process of the present invention is capable of applying a multilayer coating over any rigid or semi-rigid tubular material.
  • a multilayer coating is capable of applying a multilayer coating over any rigid or semi-rigid tubular material.
  • Application of multi-layer coatings on other materials may be of a decorative nature with some protection also being obtained, for example improved chemical resistance of the outer shell of the multi-layer coating over the underlying rigid or semi-rigid tubular material .
  • the metal tubing 12 is pretreated as required through various clean and rinse stages.
  • the pretreating of the metal surface may also include pickling to remove oxides and to improve the metal surface for deposition of a metal based coating, such as a zinc based coating that is applied by hot dip galvanization, sometimes referred to as the "hot process” as previously described, or the preferred method of electrolytic bath coating or plating sometimes referred to as the "electrolytic or cold process” as previously described.
  • previously pretreated metal tubing 12 may be supplied to the zinc based coating process step according to the present invention, or a previously zinc base coated metal tubing 12 may be supplied to the surface treating step of the process according to the present invention.
  • metal tubing 12 with a zinc based coating applied thereon in a range of 0.4 to 1.0 mil is either produced or supplied for subsequent treating as will be disclosed hereinafter according to the present invention.
  • the external surface of the zinc based coating is treated to seal the zinc based coating to prolong its corrosion resistance and to provide a suitable surface for application of and bonding to extruded multiple layers of plastic to be subsequently supplied.
  • the surface treatment of the zinc based coating is at least one of the surface sealing treatments selected from the group of a phosphate coating, a chromate coating including the clear, yellow and green versions, a zinc- aluminum alloy coating, and combinations thereof.
  • a suitable zinc-aluminum alloy and coating is described in United States Patent Number 4,448,748 which is incorporated herein by reference, and ASTM Designation: B750-88 provides a standard specification for zinc-5% aluminum-mischmetal alloy in ingot form hot-dip coatings, which is also incorporated herein by reference.
  • Metal tubing pretreatment prior to plastic application can include combinations such as zinc-aluminum alloy with a phosphate coating and a chromate coating, zinc plate with a chromate coating, zinc plate with a phosphate coating and a chromate coating, galvanized zinc with a phosphate coating and/or a chromate coating, zinc-nickel alloy plate with a phosphate coating and/or a chromate coating, zinc-cobalt alloy with a phosphate coating and/or a chromate coating, a chromate coating of the clear, yellow and green versions, and combinations thereof.
  • the pretreatment of the metal surface prior to the zinc base coating can include sand, shot or bead blasting, or other means of abrading the surface to roughen it, or detergent cleaning with rinse and acid pickling followed by a rinse. Any suitable surface abrading or etching process, either chemical or mechanical, may be used as a pretreatment prior to any other surface treatment and/or prior to extruding plastic onto the metal surface.
  • the chromate coating can be applied as a wash having essentially no remaining weight.
  • the zinc-aluminum alloy coating can be applied with a weight selected in a range of between 36 to 95 g/m 2 inclusive, and with a preferred weight range of between 75 to 80 g/m 2 inclusive and a most preferred weight of 78 g/m 2 .
  • the phosphate coating can be applied with a weight in the range of between 120 to 250 mg/ft 2 (1.292 to 2.691 g/m 2 ) inclusive.
  • the zinc based coating on the metal surface is preferably a weight in the range of between 13 to 35 microns inclusive.
  • metal tube 12 having a 3/16 inch diameter brazed tube, or 5/16 inch and 3/8 inch diameter welded steel tube.
  • the process according to the present invention is not size dependent, and therefore it is anticipated that other sizes, including smaller sizes and larger sizes, of metal tube 10 can be processed according to the present invention.
  • the zinc-aluminum galvanizing alloy or coating preferably contains from about 85% to 97% zinc, from about 4% to 15% aluminum and at least about 5 ppm mischmetal (a variety of known rare earth containing alloys) .
  • a primer 17 is applied.
  • Multiple plastic layers are extruded on the treated surface 16 of the zinc based layer 14. In the alternative, multiple plastic layers can be extruded on to the external surface of the metal tube 12 without pretreatment.
  • the multiple plastic layers preferably include at least an alloy or bonding layer, referred to herein as a first layer 18 formed on top of the treated surface layer 16 and an external shell or second layer 22 exposed to the outside environment.
  • An optional intermediate or third layer 20 may be provided between the first layer 18 and the second layer 22 and may include one or more sublayers of plastic materials.
  • the metal tube 12 Prior to extruding the multiple plastic layers onto the treated surface 16, the metal tube 12 is preheated to temperatures in the range of between 177°C to 232°C (350°F to 450°F) inclusive, with a preferred range of between 204°C to 232°C (400°F to 450°F) inclusive.
  • the multiple layers of extruded plastic form a coating over the treated surface 16 with an overall thickness in a range of between 75 to 300 microns (3 to 12 mils) , with a preferred range of between 125 to 250 microns (5 to 10 mils) .
  • Individual plastic layers can be applied with a thickness in a range of between 10 to 250 microns (0.3 to 10 mils) inclusive, with a preferred range of between 125 to 250 microns (5 to 10 mils) inclusive.
  • a more detailed description of the process according to the present invention follows.
  • the tubing 12 as previously described is subjected to a clean and rinse step followed by a pickling process step to remove oxides and to improve the external metal surface for subsequent flash plating. After the pickling step, the metal tubing 12 is subjected to a rinse step.
  • the electroflux and flash plate with zinc step then applies the zinc based layer of a thickness in the range of 0.4 to 1.0 mil inclusive.
  • a zinc-aluminum alloy coating is then applied to the external surface of the zinc based layer.
  • a suitable zinc-alloy coating is commercially available under the tradename GALFAN from Eastern Alloys, Inc. of Maybrook, New York.
  • the sealing step of applying GALFAN while controlling the thickness in a range of 36 to 95 g/m 2 with a most preferred thickness of 78 g/m 2 is followed by a water quench step to bring the tubing 12 back to ambient temperature, followed by a rinse step.
  • a phosphate surface may be applied to the external surface of the GALFAN coating for improved adhesion of subsequent layers.
  • a rinse step follows the phosphating step. The application of a chromate coating occurs.to seal the phosphate surface applied.
  • the phosphate surface is preferably applied with a thickness in the range of 120 to 250 mg/ft 2 (1.292 to 2.691 g/m 2 ), while the chromate coating may be applied as a wash having essentially no remaining weight on the tubing upon completion. After the chromate wash step, the multiple layers of plastic are extruded onto the metal tubing 12.
  • the tubing has been heated in a range of between 375 to 450°F inclusive with a preferred temperature of 425°F prior to the application of the multiple layers of plastic.
  • a conventional mechanical applicator or extrusion head is used for coextruding the multiple layers of plastic simultaneously onto the surface of the preheated metal tube 12.
  • vacuum is applied to the head of the applicator to pull the plastic material down onto the surface of the preheated tube 12.
  • the vacuum applied is preferably in the range of 1 inch to 22 inches of water (where 28 inches of water is equal to atmospheric pressure) , with a preferred vacuum pressure of 10 inches of water.
  • the tubing 12 is subjected to a quench, which can be a water quench, oil quench or other material quench as required, and is thereafter coiled or cut to finished length.
  • a quench which can be a water quench, oil quench or other material quench as required, and is thereafter coiled or cut to finished length.
  • the process could also be carried out as a cross-head application wherein the layers are applied synchronously instead of simultaneously. However, this process is not as preferred as the coextrusion, in that there is a greater likelihood of loss of bonding efficiency and bonding properties, and there tends to be less control over layer thicknesses .
  • Multi-layer tube 10 comprises a tube or pipe 12 having an outer surface 13.
  • Tube 12 may be formed in any conventional manner and of any suitable material.
  • tube 12 may be a welded single wall steel tube, a brazed double wall steel tube, etc.
  • aluminum, stainless steel and the like also may be used.
  • tube 12 may be formed from any rigid or semirigid tubular material .
  • Tube 12 may be of circular cross section as shown, however, it is to be understood that tube 12 may be formed of any suitable size and/or shape, including square, rectangular and other geometric configurations .
  • a zinc layer 14 is bonded to the metal tube outer surface 13. It is to be understood that any suitable zinc layer 14 may be used in accord with the present invention. However, in the preferred embodiment, the zinc layer is selected from the group consisting of zinc plating, zinc nickel alloys, zinc cobalt alloys, zinc aluminum alloys, and mixtures thereof.
  • a surface treatment layer 16 is bonded to the zinc layer 14. Any suitable surface treatment layer 16 may be used. However, in the preferred embodiment, surface treatment layer 16 is selected from the group consisting of a zinc/aluminum/rare earth alloy, phosphate, chromate, and mixtures thereof.
  • the phosphate and/or chromate may be applied in any suitable manner.
  • a hot phosphoric acid is used. Without being bound to any theory, it is believed that this acid etches into the metal surface, leaving a phosphate crystalline structure in the metal, which structure aids in subsequent adhesion of polymeric materials.
  • a wet bath chromate may be used, after which the metal is rinsed well. Chromium oxides are left on the metal, which are believed to aid in corrosion resistance, and which, although optional, are further believed to enhance the advantageous properties of the phosphate.
  • a dry chromate may be used which does not require subsequent rinsing.
  • the zinc/aluminum/rare earth alloy used is preferably GALFAN, commercially available from Eastern Alloys, Inc. in Maybrook, New York; licensed from the International Lead Zinc Research Organization, Inc. located in New York, NY; and described in U.S. Patent No. 4,448,748, discussed more fully above.
  • GALFAN commercially available from Eastern Alloys, Inc. in Maybrook, New York; licensed from the International Lead Zinc Research Organization, Inc. located in New York, NY; and described in U.S. Patent No. 4,448,748, discussed more fully above.
  • Particularly preferred is the combination of the GALFAN with the phosphate, or the GALFAN with the phosphate and chromate.
  • the zinc layer 14 and/or surface treatment layer 16 may be optional components of the present invention.
  • Various polymeric compositions may be applied directly to a bare metal surface, especially for decorative purposes. Further, it is contemplated that various polymeric compounds and/or blends, including those containing suitable ionomers, may substantially bond to
  • a primer 17 is applied beneath the polymeric layer (s), to the outer surface of the metal tube 12 having any desired pretreatment/coatings thereon.
  • the primer may be any suitable primer which would promote adhesion of the polymeric layer (s) to the metal tube 12, even under aggressively corrosive conditions.
  • the primer is Nylon Primer 2BME45451, commercially available from Akzo Nobel Co.
  • a product data sheet for this material is appended hereto as Table A.
  • An MSDS for this material is appended hereto as Table B.
  • a first polymeric layer 18 is bonded to the surface treatment layer 16. It is to be understood that any suitable polymeric layer may be used which suitably bonds to the surface treatment layer 16, and in turn, suitably bonds to subsequent polymeric layers, if any.
  • the first polymeric layer 18 is selected from the group consisting of a thermoplastic elastomer, an ionomer, a nylon, a fluoropolymer, and mixtures thereof .
  • a second polymeric layer 22 may be bonded to the first polymeric layer 18 (not shown) . It is to be understood that any suitable polymeric layer may be used which suitably bonds to first layer 18, and which provides suitable mechanical and chemical corrosion resistance. In the preferred embodiment, the second polymeric layer 22 is selected from the group consisting of a nylon, a thermoplastic elastomer, a fluoropolymer, and mixtures thereof .
  • the multi-layer tube 10 may further comprise a third polymeric layer 20 interposed between, and bonded to the first and second polymeric layers. It is to be understood that any suitable polymeric layer may be used which suitably bonds to first layer 18 and to the second layer 22 and which may optionally provide suitable cushioning, if desired. In the preferred embodiment, the third polymeric layer 20 is selected from the group consisting of an ionomer, a nylon, ethylene vinyl alcohol, a polyolefin, and mixtures thereof.
  • any or all of the three layers, 18, 22, 20 may include multiple sublayers (not shown) .
  • each of the layers and/or sublayers may be formed from a single compound listed in the relevant group, or from a combination thereof.
  • each of the layers/sublayers may be comprised of the same material.
  • the thickness of the combined polymer layers can be as little as .004 inch, and can be made even thinner.
  • Successful coatings have been applied having combined polymer layer thicknesses of .004 inch, .005 inch, .006 inch, .007 inch, .009 inch and .010 inch, with a preferred range of .005 inch to .010 inch. Examples of suitable compounds for each of the layers will be described hereinafter.
  • One of the advantages of the present invention is that a chemical or mechanical bond is formed between- all the layers. It is believed that good bonding prevents moisture buildup beneath the layers, which buildup greatly increases the likelihood of corrosion.
  • thermoplastic elastomers which can successfully be employed in the tubing 10 of the present invention are commercially available under tradenames such as: SANTOPRENE ® , a thermoplastic rubber commercially available from Advanced Elastomer Systems of St. Louis, MO; KRATON ® , a thermoplastic rubber composed of a styrene-ethylene/butylene-styrene block copolymer commercially available from Shell Chemical Co. of Houston, TX; SARLINK, an oil resistant thermoplastic commercially available from Novacor Chemicals of Leominster, MA; and VICHEM, a family of polyvinyl chloride compounds commercially available from Vichem Corporation of Allendale, Michigan.
  • SANTOPRENE ® a thermoplastic rubber commercially available from Advanced Elastomer Systems of St. Louis, MO
  • KRATON ® a thermoplastic rubber composed of a styrene-ethylene/butylene-styrene block copolymer commercially available from Shell Chemical Co. of Houston, TX
  • HYTREL is a preferred compound.
  • HYTREL is a thermoplastic elastomer commercially available from E.I. DuPont de Nemours & Co., located in Wilmington, Delaware. It is contemplated that any grade of HYTREL is useful in the present invention, preferably such a grade which possesses a Shore D Hardness ranging between about 40 and about 55, and still more preferably, one having a Shore D Hardness of about 40.
  • Grades having D40 (Shore) hardness include G-4074; G-4078; 4056; and 4059 FG.
  • a suitable nylon material includes 12 carbon block polyamides, 11 carbon block polyamides, and zinc chloride resistant 6 carbon block polyamides. Of these, Nylon 12 and zinc chloride resistant Nylon 6 are preferred.
  • the 6-carbon block polyamide or Nylon 6 either inherently exhibits zinc chloride resistance or contains sufficient quantities of modifying agents to impart a level of zinc chloride resistance greater than or equal to that required by Performance Requirement 9.6 as outlined in SAE Standard J844 (Revised June 1990) , i.e. non-reactivity after 200 hour immersion in a 50% by weight zinc chloride solution.
  • the Nylon 6 can also be modified with various plasticizers, flame retardants and the like in manners which would be known to one reasonably skilled in the art.
  • polymeric material of the first and second polymeric layers is Nylon 12.
  • the Nylon 12 of choice is VESTAMID X 7377, commercially available from Huls-Creanova.
  • a product data sheet for this material is appended hereto as Table C; and an MSDS is appended hereto as Table D.
  • This material has lower viscosity and lower molecular weight, thus advantageously allowing for higher line speeds during multi- layer tubing 10 production.
  • Suitable fluoropolymers may include polyvinylidine fluoride, polyvinyl fluoride, ethylene tetrafluoroethylene, and mixtures thereof.
  • the material can also be a graft copolymer of the preceding materials together with a fluorine-containing polymer such as copolymers of vinylidine fluoride and chlorotrifluoroethane.
  • Suitable material employed may contain between about 60% and about 80% by weight polyvinylidine difluoride. Materials so formed have a melting point between about 200°C and about 220°C and a molding temperature between about 210°C and about 230°C.
  • suitable fluoropolymers include: a copolymer of a vinyl fluoride and chlorotrifluoroethylene, the vinyl fluoride material selected from the group consisting of polyvinylidine fluoride, polyvinyl fluoride, and mixtures thereof; a copolymer of vinyl fluoride material and ethylene tetrafluoroethylene; a non-fluorinated elastomer, and mixtures thereof.
  • the material of choice exhibits an affinity to polymers employed in the first 18 second 22 or third 20 layers, such as, for example, Nylon 12 or Nylon 6.
  • Some suitable fluoropolymers are commercially available under the tradename "ADEFLON A" from Atochem Inc. elf Aquitaine Group of Philadelphia, Pennsylvania .
  • Suitable materials especially useful in an interposed layer 20 or in sublayers of any of the three layers 18, 22, 20 include ethylene vinyl alcohol, selected from the group consisting of copolymers of substituted or unsubstituted alkenes having less than four carbon atoms and vinyl alcohol, and mixtures thereof .
  • ethylene vinyl alcohol selected from the group consisting of copolymers of substituted or unsubstituted alkenes having less than four carbon atoms and vinyl alcohol, and mixtures thereof .
  • usef l are copolymers of alkenes having less than four carbon atoms and vinyl acetate.
  • polyolefin compounds including, but not limited to polyethylene, low density polyethylene, and polypropylene .
  • the multi-layer tube 10 may have the first polymeric layer 18 consisting essentially of an ionomer and a nylon, such as ethylene methacrylic acid copolymer- -partial metal salt, and Nylon 12.
  • This may be in any suitable percent composition and may have any additional suitable additives.
  • this percent composition ratio is between about 10% and about 70% ethylene methacrylic acid copolymer- -partial metal salt, and between about 90% and about 30% Nylon 12. More preferably, this percent composition ratio is between about 40% and about 60% ethylene methacrylic acid copolymer--partial metal salt, and between about 60% and about 40% Nylon 12.
  • the second polymeric layer 22 may consist essentially of a nylon. In the preferred embodiment, this layer is Nylon 12.
  • Third layer 20 may be any of the suitable materials listed hereinabove. In an alternate preferred embodiment, this third layer 20 may be a "regrind” or “recycle” of the suitable polymeric materials enumerated above. It is to be understood that the definition of "regrind” or “recycled” material as used herein comprises any generation of "regrind” or “recycled” material which substantially possesses between about 65% and about 95% (or higher) of each of the cold temperature impact, viscosity and elongation properties of the virgin material; more preferably, possesses between about 80% and 95%, and still more preferably possesses between about 90% and 95%.
  • any suitable regrind which performs in the desired manner in the present invention is contemplated and may successfully be used herein. If such a "regrind" is used as third layer 20, it is preferred that a virgin material be used as second (outer) layer 22.
  • the process for applying the primer is described and shown in Figs. 1-3, 5 and 6. This process is an airless spray system, having a closed atmosphere. This system provides a uniform coating of primer. Further, it is environmentally friendly in that virtually no noxious fumes escape to the atmosphere, virtually all the primer is captured and reused, and since it is a closed atmosphere, the amount of solvent used is reduced- -the operator does not need to keep adding solvent since there is little appreciable solvent loss.
  • Negative pressure in the paint booth prevents escape of VOCs into the atmosphere .
  • a chemical is added into the water scrubber which causes VOCs to coagulate and rise to the surface, which coagulants may then be skimmed off the top and disposed of in an environmentally safe manner.
  • a 3/16 inch brazed steel tube had a GALFAN coating of 78 g/m 2 and a phosphate coating of 120-250 mg/ft 2 , with an additional chromate wash, with the chromate wash having essentially no remaining weight.
  • a primer commercially available from Akzo Nobel under the tradename Nylon Primer 2BME45451 was applied to the tube having the GALFAN/phosphate/chromate as described immediately above. The primer was applied by the airless spray system as described further hereinabove. Applied thereto were two layers of. Nylon 12 (VESTAMID X7377) having a total thickness between about .005 inch to .010 inch.
  • Example II The tubing of Example I was cut into 6 tube specimens and was subjected to various tests. The tests are described in Table E appended hereto. The test results are described in Table F appended hereto.
  • Example III The tubing of Example I was cut into 3 tube specimens and was subjected to various tests. The tests are described in Table E appended hereto . The test results are described in Table G appended hereto.
  • Nylon Primer Adhesion promoting primer for under Nylon over Galfan tubing The primer improves the adhesion, flexibility and corrosion of the Nylon coating.
  • Peak Metal Temperature 450-550 °F
  • BOILING RANGE VAPOR DENSITY VS. AIR: 243 - 405 DEG. F HEAVIER THAN AIR
  • KEEP CONTAINERS TIGHTLY CLOSED. ISOLATE FROM HEAT, SPARKS, ELECTRICAL EQUIPMENT AND OPEN FLAME.
  • CLOSED CONTAINERS MAY EXPLODE WHEN EXPOSED TO EXTREME HEAT.
  • DURING EMERGENCY CONDITIONS OVER EXPOSURE TO DECOMPOSITION PRODUCTS MAY CAUSE A HEALTH HAZARD.
  • SYMPTOMS MAY NOT BE IMMEDIATELY APPARENT. OBTAIN MEDICAL ATTENTION.
  • INCOMPATIBILITY MATERIALS TO AVOID: NONE REASONABLY FORESEEABLE.
  • CARBON MONOXIDE CARBON DIOXIDE, SMOKE, OXIDES OF NITROGEN.
  • INSULATION MOVE TO FRESH AIR. GIVE ARTIFICIAL RESPIRATION IF NECESSARY. SKIN CONTACT: WASH WITH SOAP & WATER.
  • EYE CONTACT FLUSH WITH WATER FOR AT LEAST 15 MINUTES. CONSULT A PHYSICIAN. INGESTION: DRINK ONE OR TWO GLASSES OF WATER TO DILUTE. DO NOT INDUCE VOMITING. CONSULT PHYSICIAN OR POISON CONTROL CENTER IMMEDIATELY. TREAT SYMPTOMATICALLY. MEDICAL CONDITIONS PRONE TO AGGRAVATION: NONE EXPECTED.
  • PROLONGED SKIN CONTACT MAY LEAD TO EXTRACTION OF NATURAL OILS WITH RESULTANT DRY SKIN, CRACKING, IRRITATION AND DERMATITIS.
  • VESTAMID X 1377 black 9.7504 (lower viscosity): 210-230 -C (410-445 -F) melt temperature
  • Chromate application as thin as possible - because the chromate layer has no mechanical strength as thick as necessary - to be sure that the whole surface is treated (additional primers or conditioning are not necessary)
  • a vacuum should be applied between the steel tube and the PA 1 to enhance the application of the melt to the steel.
  • the outer PA 12 surface and the adhesion of the PA 12 to steel may both be contingent on this distance, in relation to line speed & temperatures.
  • This product does not contain any components considered to be health hazards under the OSHA Hazard Communication Standard 29 CFR 1910.1200 or under the WHMIS Controlled Product Regulations in Canada.
  • Fumes from hot processing may be irritating to eyes and respiratory tract.
  • Eye Contact Fumes from hot processing may cause eye irritation.
  • Fumes from hot processing may cause irritation.
  • Ingestion Not applicable; not an expected route of exposure.
  • Dusts at sufficient concentrations can form explosive mixtures with air.
  • Steps to be taken in case material is released or spilled Allow molten material to solidity and scrape up. Collect material and place in a disposal container. Obey relevant local, state, provincial and federal laws and regulations. Do not contaminate any lakes, streams, ponds, groundwater or soil.
  • This product does not contain any components considered to be health hazards under the OSHA Hazard Communication Standard 29 CFR 1910.1200 or under the WHMIS Controlled Product Regulations in Canada.
  • This product is stable under normal storage conditions.
  • Incinerate follows all federal, state, and local regulations.
  • This product contains the following non-hazardous components:
  • This product contains the following components listed as Hazardous Air Pollutants:
  • This product contains the following components listed as Extremely Hazardous Air Pollutants:
  • This product or its components are listed in or exempt from TSCA inventory requirements.
  • This product contains the following non-proprietary substances subject to export notification under Section 12(b) of TSCA:
  • This product contains the following non-hazardous components subject to disclosure under New Jersey Right-To-Know legislation:
  • This product contains the following non-hazardous components subject " ⁇ ⁇ - to disclosure under Pennsylvania Right-To-Know legislation:
  • This standard outlines the requirements for coatings applied to the outside and tide diameter of steel tubing.
  • the coatings are applied to the outside diameters of double wall brazed thing (MS-1806) or single wail welded tubing (MS-3236).
  • This standard defines the coating requirement for cases requiring greater internal corrosion resistance than carbon steel aril approaching the corrosion resistance of austenitic stainless steel.
  • Coating I offers superior corrosion and abrasion resistance over Coatings U. Coatings I and It shows improved corrosion resistance over Coatings JJI, IV and V and VI. Both coatings V and VI containing Lead Tin are being phased out over the next few years.
  • Coating V used in non-abrasive areas of some passenger car platforms for brake line applications and for fuel lines in passenger cars, jeep and truck.
  • Coating V a duplex coating of zinc rich with the heavier Tin Lead Coating, is often used with a mechanical abrasion resistant zinc coated (PS-77) steel wire cover or other protective covering for brake lines.
  • PS-77 mechanical abrasion resistant zinc coated
  • Aluminum coated armor wire with a minimum coating weight of 60 g/m 2 per ASTM A 764 Type A is used as a further protection for stone abrasion. Armor is expected to be superior to shrink wrap for use in abrasion resistance protection for Coating I should it be required.
  • the melt point of Coating I Polyamide 12 coating is approximately 177 Degrees C (350 Degrees F).
  • the safe operating temperature for the zinc aluminum alloy is approximately 250 Degrees C (482 Degrees F).
  • the aluminum rich coating is cured at 254 degrees C to 275 degrees C (490 degrees F to 527 degrees F).
  • the polyvinylidene or poly vinyl fluoride coating is cured at 240 degrees C (464 degrees F).
  • the zinc chromate coating is cured at 190 degrees C (375 degrees F).
  • This standard describes the methods for corrosion protection of tubing used for automotive brake and fuel lines, transmission oil cooler lines, and power steering lines.
  • the engineering coating designation codes process for applying the coatings, requirements of appearance, coating weight and thickness of the individual coatings, and the corrosion resistance from the combination of coatings are defined.
  • PS-8688 AZ Designates an aluminum rich coating applied to a zinc aluminum alloy coated tubing.
  • PS-8688 LZ Designates an extruded Nylon 12 polyamide coating applied to a zinc aluminum coated tubing.
  • ⁇ PS-8688 NH Designates a Terne coat over the tubing and no topcoat over the Terne. Coating weight of lead - tin aUoy is 49 gin?.
  • PS-8688 PZ Designates a polyvinyl fluoride coating applied over a zinc aluminum alloy coating tubing.
  • PS-8688 CH Designates zinc rich organic, chromate coating applied to a lead-tin aUoy coating.
  • the coating weight for the lead-tin is 49 g/m 3 .
  • PS-8688 LZN Designates an extruded Nylon 12 polyamide coating applied to a zinc aluminum coated tubing. The JD of the tubing is coated with a deposit of 3.8 microns minimum of nickel electroplate.
  • PS-8688 PEN Designates a Polyvinyl Fluoride over electroplated zinc on the outside diameter and 3.8 microns minimum of electroplated nickel applied to the inside diameter of the tubing.
  • Zinc electroplating shall be in accordance PS-79.
  • the zinc aluminum aUoy hot dip coating process shall use a 95% zinc - 5% aluminum alloy per paragraph 3.2 (Table 3).
  • a fluoride coating shall be applied to the outside diameter of the tubing.
  • Either the polyvinyl fluoride or the polyvinylidene fluoride coating is to be used as a top coating.
  • the top coatings are applied over zinc or zinc aluminum aUoy coatings.
  • the nylon polyamide 12 coating shall be applied to the outside diameter of the tubing. It shall be used as the top coating.
  • the Nylon 12 is extruded over the zinc aluminum alloy Paragraph 3.2 (Table 3) coated tubing. Prior to the extrusion of Nylon 12, an application of the primer shall be used to promote adhesion and corrosion resistance of the tubing.
  • the nickel coating is used for LZN or PEN or AZN.
  • the nickel coating shall be applied to the inside diameter of the tubing.
  • the nickel coating is electro deposited per ASTM B689-90 to the low carbon steel substrate.
  • the nickel coating shall be free from pits or blisters.
  • the strip shall withstand a 180 degrees bend over a radius equal to twice the thickness of the strip and return without showing any peeling or lifting of the nickel when examined under a 10X magnification. Minimum thickness is 3.8 microns (0.000150 inch) free or diffused Nickel. Nickel reflows over the resistance tube weld to maintain exceptional corrosion resistance at the inside diameter.
  • the aluminum rich organic coating shall be applied to the outside diameter of the zinc aluminum alloy Paragraph 3.2 (Table 3) coated tubing.
  • the tubing shall be baked to cure the aluminum rich organic coating.
  • the coating consisting of zinc particles, chromates, and organic material shall be applied to the outside diameter of the tubing.
  • the tubing shall be baked to cure this organic coating to a coverage of Paragraph 4.4D.
  • the coating shall be applied to the outside diameter of the tubing.
  • the tubing shall be cleaned and immersed in a fluxing solution. Then the tubing shall be immersed in a molten bath of lead-tin alloy which contains a minimum of the percent tin as defined in Paragraph 4.4.C.
  • the coated tubing shall be washed as required to remove any residual flux.
  • Color shall be black unless otherwise specified.
  • the minimum coating coverage of the Nylon 12 polyamide coating is 0.17 mm (0.0067 inch) minimum and shall meet the OD requirements of Table 4.
  • Color shall be black or olive drab unless otherwise specified on the engineering drawing.
  • the thickness of the electroplated zinc is 0.001 Inch (25 microns) minimum for MS-18060.0005 inch (13 microns) for MS-3235.
  • the minimum coating coverage is 180 g/m 2 and 90 g/m2 for MS-1806 and MS-3235 respectively.
  • the minimum average thickness is 0.0002 inch (5.2 microns); die minimum coating coverage is 36 g/m 2 per ASTM A 90.
  • the thickness of the fluoride coating is 0.0004 Inch (10 microns) minimum per ASTM B487.
  • Color shall be sUver-grey unless otherwise specified.
  • the minimum coating coverage of the aluminum rich organic coating is 8 g/m 2 (0.026 ozlft.2) per ASTM A 90.
  • the minimum coating coverage is 31 g.m2 (0.10 ozlfl 2 ) for the lead-tin coating applied to MS-1806 double wall brazed tubing.
  • the minimum coating coverage is 18 gin? (0.06 ozlft 2 ) for lead tin coating applied to MS-3235 electric resistance welded tubing per ASTM A 309, LP-461H-102.
  • composition of the lead-tin alloy shaU consist of 12% minimum tin and balance lead for coating applied over MS-1806 double waU brazed tubing and 7% minimum tin and balance lead for coating over MS-3235 single wall tubing.
  • the minimum coating coverage of the organic zinc chromate coating is 15 gin? (0.05 oz.lft.2) per ASTM A 90.
  • the coating shaU be free of bare spots visible to the unaided eye.
  • the final coating shall be smooth, even, and free from cracks, blisters, pi holes, nodules and other harmful defects. Coverage shall he uniform in appearance and complete.
  • the zinc or zinc attoy or lead-tin aUoy shall have good adhesion to the substrate and to itself, and show no tendency toward flaking or peeling when tested in accordance with ASTM Standard Test Method B 571.
  • the tin-lead alloy coated tubing shatt be free from uncoated spots. Any uncoated areas which are visible to the unaided eye at normal reading distance shatt be considered unsatisfactory and sufficient cause for rejection. The presence of uncoated areas may be verified by the Ferroxyl Test, Chrysler Laboratory Procedure 461 H-80.
  • Tubing shatt show no lifting or delamination of coating; red rust is allowed only at knife cut after 2000 hours per ASTM B-117.
  • the OD tube coating shall show no lifting or delamination when cut and peel tested after fluid soaks in
  • Nylon 12 After soak testing, cut and peel test by scribing two longitudinal knife cuts at 0.093 inch (2.3mm) separation and cutting at 90 degrees to effect a tab start section of Nylon 12 coating. After testing in fluid soaks per Table 5, Nylon 12 'may lift when pulled for less than 6.35 mm (0.25 inches) and then tear. No adhesive failure to base metal is permissible. Cohesive faUure thru primer is acceptable.
  • Evaluation ofW corrosion for coating such as Nickel plating at 3.8 microns (0.00015 Inch) minimum thickness after soak per Table 5 for 500 hours shall show no red rust or pitting after 500 hours exposure in soak fuels referenced in Table 5.
  • Fuel C (50% iso octane, 50% toluene)
  • Copper coated LO developed from double watt copper brazed steel tubing
  • Test tubes per Gravelometer test - SAE J400 (LP-463PB-39-01) five (5) pints at 482 kPa (70 psi) and tubes oriented at 45 degrees from the nozzle.
  • Nylon After exposure by putting. Nylon may lift when putted for less than 6.35 mm (.25 inches) and. then tear.
  • salt spray corrosion resistance for 360 hours salt spray per ASTM B-117 no more than 1% red rust over any 25.4 mm (1 inch) length compared to ASTMD 610, Plate 6.
  • the final assembly or part shall be capable of withstanding 200 hours resistance to red rust and shall show no more than one base metal corrosion spot, 1.5 mm (0.060 in.) In diameter or larger in any area 500 mm 2 (0.77 quare inches) when Salt Spray tested per ASTM B-117.
  • Nickel plating 3.8 microns (0.00015 inch) minimum thickness shall show no red rust after 500 hours exposure in soak fuels referenced in Section 5.I.B.
  • the designations ⁇ S>, ⁇ E>, ⁇ N>, ⁇ T>, or ⁇ H> witt be substituted for the Safety, Emission, Noise, Theft Prevention, or Homologatwn Shields respectively.
  • the designations ⁇ D> and ⁇ P> will be substituted for the Diamond and Pentagon symbols respectively.

Landscapes

  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Metallurgy (AREA)
  • Materials Engineering (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Organic Chemistry (AREA)
  • Inorganic Chemistry (AREA)
  • Laminated Bodies (AREA)
  • Rigid Pipes And Flexible Pipes (AREA)
  • Application Of Or Painting With Fluid Materials (AREA)
  • Lining Or Joining Of Plastics Or The Like (AREA)
  • Chemical Treatment Of Metals (AREA)
  • Other Surface Treatments For Metallic Materials (AREA)

Abstract

L'invention se rapporte à un tube multicouche (10) résistant à la corrosion, qui comporte un tube métallique (12), une couche de zinc (14) liée à la surface externe (13) du tube métallique, une couche de traitement de surface (16) liée à la couche de zinc (14), une couche d'apprêt (17), une première couche polymère (18) liée à la couche d'apprêt et une seconde couche polymère (22) liée à la première couche polymère (18). L'invention se rapporte à un procédé de fabrication dudit tube qui consiste à extruder de multiples couches d'un thermoplastique, susceptible d'être traité à l'état fondu, et à former ainsi un tube métallique prétraité ayant une surface externe comportant au moins un revêtement à base de zinc, un revêtement d'étanchéité recouvrant le revêtement à base de zinc, et un revêtement d'apprêt recouvrant le revêtement d'étanchéité. Ledit revêtement d'étanchéité (17) est de préférence appliqué au moyen d'un système de pulvérisation sans air dans une atmosphère fermée, dans laquelle sensiblement aucun composé organique volatil ne s'échappe dans l'atmosphère. La(les) couche(s) polymère(s) adhère(nt) de manière permanente au tube métallique, même lorsqu'elle(s) est(sont) exposée(s) à des environnements corrosifs agressifs pendant des périodes prolongées.
EP00908310A 2000-01-19 2000-01-19 Tube metallique resistant a la corrosion et procede de fabrication correspondant Withdrawn EP1252368A1 (fr)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
PCT/US2000/001292 WO2001053566A1 (fr) 2000-01-19 2000-01-19 Tube metallique resistant a la corrosion et procede de fabrication correspondant

Publications (1)

Publication Number Publication Date
EP1252368A1 true EP1252368A1 (fr) 2002-10-30

Family

ID=21740980

Family Applications (1)

Application Number Title Priority Date Filing Date
EP00908310A Withdrawn EP1252368A1 (fr) 2000-01-19 2000-01-19 Tube metallique resistant a la corrosion et procede de fabrication correspondant

Country Status (4)

Country Link
EP (1) EP1252368A1 (fr)
JP (1) JP2003521581A (fr)
AU (1) AU2000229684A1 (fr)
WO (1) WO2001053566A1 (fr)

Families Citing this family (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2004232010A (ja) * 2003-01-29 2004-08-19 Sanoh Industrial Co Ltd 多層保護被覆鋼管
KR101465074B1 (ko) 2013-04-19 2014-11-26 주식회사 세아에프에스 내식성 강관
KR101469967B1 (ko) * 2013-04-19 2014-12-08 주식회사 세아에프에스 내식성 강관
CN111347698B (zh) * 2018-12-24 2021-09-17 脉通医疗科技(嘉兴)有限公司 医用管材及其制备方法

Family Cites Families (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5590691A (en) * 1994-05-02 1997-01-07 Itt Corporation Extruded multiple plastic layer coating bonded to a metal tube
US6130404A (en) * 1997-03-03 2000-10-10 Itt Automotive, Inc. Electro-optical removal of plastic layer bonded to a metal tube

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
See references of WO0153566A1 *

Also Published As

Publication number Publication date
WO2001053566A1 (fr) 2001-07-26
AU2000229684A1 (en) 2001-07-31
JP2003521581A (ja) 2003-07-15

Similar Documents

Publication Publication Date Title
US6976510B2 (en) Corrosion resistant metal tube and process for making the same
US5590691A (en) Extruded multiple plastic layer coating bonded to a metal tube
US5867883A (en) Extruded multiple plastic layer coating bonded to the outer surface of a metal tube having an optional non-reactive inner layer and process for making the same
US20050048218A1 (en) Process for coating substrates with polymeric compositions
EP1059365A1 (fr) Tube métallique revêtu d'une poudre résistante à la corrosion et procédé de sa fabrication
JP3346580B2 (ja) 金属管に付着したプラスチック層の電子・光学的除去
JP3445858B2 (ja) 保護被覆層を有する自動車用金属配管
US5783622A (en) Precoated chromium alloyed steel with enhanced paint adhesion for exhaust applications
EP1252368A1 (fr) Tube metallique resistant a la corrosion et procede de fabrication correspondant
KR101696038B1 (ko) 유무기 복합 피막용 수지 조성물, 이를 이용한 자동차용 연료탱크강판 및 이의 제조방법
JPS589965A (ja) 高耐食性表面処理鋼板
JPH11129387A (ja) 高耐食性燃料タンク用鋼板
CA2280468A1 (fr) Pellicule de masquage
JP6766404B2 (ja) ４層ポリオレフィン樹脂被覆鋼管
JP2004232010A (ja) 多層保護被覆鋼管
JPH08300561A (ja) ポリエチレン被覆鋼管
JPH07290640A (ja) ポリエチレン被覆鋼管
JPH07290641A (ja) ポリエチレン被覆鋼材
JP3934762B2 (ja) 高耐食性燃料タンク用鋼板
JPH01110140A (ja) 耐食性、潤滑性に優れた複合被覆鋼板
JPH09195871A (ja) ガソリン燃料タンク用材料
JPH01182244A (ja) 多段ネックイン溶接缶
MXPA98003150A (en) Alloy steel with pre-coated chrome, with accession to improved painting for application in esca
Goldade et al. Inhibited Coatings
JP2000127293A (ja) 塗覆装鋼管

Legal Events

Date Code Title Description
PUAI Public reference made under article 153(3) epc to a published international application that has entered the european phase

Free format text: ORIGINAL CODE: 0009012

17P Request for examination filed

Effective date: 20020819

AK Designated contracting states

Kind code of ref document: A1

Designated state(s): AT BE CH CY DE DK ES FI FR GB GR IE IT LI LU MC NL PT SE

RIN1 Information on inventor provided before grant (corrected)

Inventor name: MCDANIEL, JAMES, D.

Inventor name: SCHWIEBERT, TIMOTHY, L.

Inventor name: CAMPAGNA, GUIDO, M.

RBV Designated contracting states (corrected)

Designated state(s): DE FR GB

STAA Information on the status of an ep patent application or granted ep patent

Free format text: STATUS: THE APPLICATION IS DEEMED TO BE WITHDRAWN

18D Application deemed to be withdrawn

Effective date: 20070801