WO2022169427A1 - Coating method for coated tubes - Google Patents

Coating method for coated tubes Download PDF

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Publication number
WO2022169427A1
WO2022169427A1 PCT/TR2021/050097 TR2021050097W WO2022169427A1 WO 2022169427 A1 WO2022169427 A1 WO 2022169427A1 TR 2021050097 W TR2021050097 W TR 2021050097W WO 2022169427 A1 WO2022169427 A1 WO 2022169427A1
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WO
WIPO (PCT)
Prior art keywords
chemical agent
tube
coated outer
galfan
coating method
Prior art date
Application number
PCT/TR2021/050097
Other languages
French (fr)
Inventor
Bora SAMAN
Original Assignee
Net Boru Sanayi Ve Dis Ticaret Kollektif Sirketi Bora Saman Ve Ortagi
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 Net Boru Sanayi Ve Dis Ticaret Kollektif Sirketi Bora Saman Ve Ortagi filed Critical Net Boru Sanayi Ve Dis Ticaret Kollektif Sirketi Bora Saman Ve Ortagi
Priority to PCT/TR2021/050097 priority Critical patent/WO2022169427A1/en
Publication of WO2022169427A1 publication Critical patent/WO2022169427A1/en

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Classifications

    • 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
    • B05D3/00—Pretreatment of surfaces to which liquids or other fluent materials are to be applied; After-treatment of applied coatings, e.g. intermediate treating of an applied coating preparatory to subsequent applications of liquids or other fluent materials
    • B05D3/10—Pretreatment of surfaces to which liquids or other fluent materials are to be applied; After-treatment of applied coatings, e.g. intermediate treating of an applied coating preparatory to subsequent applications of liquids or other fluent materials by other chemical means
    • B05D3/102—Pretreatment of metallic substrates
    • 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
    • B05D3/00—Pretreatment of surfaces to which liquids or other fluent materials are to be applied; After-treatment of applied coatings, e.g. intermediate treating of an applied coating preparatory to subsequent applications of liquids or other fluent materials
    • B05D3/02—Pretreatment of surfaces to which liquids or other fluent materials are to be applied; After-treatment of applied coatings, e.g. intermediate treating of an applied coating preparatory to subsequent applications of liquids or other fluent materials by baking
    • B05D3/0254—After-treatment
    • B05D3/0281—After-treatment with induction heating
    • 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
    • B05D3/00—Pretreatment of surfaces to which liquids or other fluent materials are to be applied; After-treatment of applied coatings, e.g. intermediate treating of an applied coating preparatory to subsequent applications of liquids or other fluent materials
    • B05D3/12—Pretreatment of surfaces to which liquids or other fluent materials are to be applied; After-treatment of applied coatings, e.g. intermediate treating of an applied coating preparatory to subsequent applications of liquids or other fluent materials by mechanical means
    • 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
    • B05D7/14—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 metal, e.g. car bodies
    • B05D7/146—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 metal, e.g. car bodies to metallic pipes or tubes
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B1/00—Layered products having a non-planar shape
    • B32B1/08—Tubular products
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B15/00—Layered products comprising a layer of metal
    • B32B15/04—Layered products comprising a layer of metal comprising metal as the main or only constituent of a layer, which is next to another layer of the same or of a different material
    • B32B15/08—Layered products comprising a layer of metal comprising metal as the main or only constituent of a layer, which is next to another layer of the same or of a different material of synthetic resin
    • B32B15/088—Layered products comprising a layer of metal comprising metal as the main or only constituent of a layer, which is next to another layer of the same or of a different material of synthetic resin comprising polyamides
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B15/00—Layered products comprising a layer of metal
    • B32B15/18—Layered products comprising a layer of metal comprising iron or steel
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B27/00—Layered products comprising a layer of synthetic resin
    • B32B27/34—Layered products comprising a layer of synthetic resin comprising polyamides
    • C—CHEMISTRY; METALLURGY
    • C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
    • C23C—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THE SURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTION; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL
    • C23C2/00—Hot-dipping or immersion processes for applying the coating material in the molten state without affecting the shape; Apparatus therefor
    • C23C2/02—Pretreatment of the material to be coated, e.g. for coating on selected surface areas
    • C23C2/022—Pretreatment of the material to be coated, e.g. for coating on selected surface areas by heating
    • C—CHEMISTRY; METALLURGY
    • C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
    • C23C—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THE SURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTION; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL
    • C23C2/00—Hot-dipping or immersion processes for applying the coating material in the molten state without affecting the shape; Apparatus therefor
    • C23C2/04—Hot-dipping or immersion processes for applying the coating material in the molten state without affecting the shape; Apparatus therefor characterised by the coating material
    • C23C2/06—Zinc or cadmium 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
    • C23C2/00—Hot-dipping or immersion processes for applying the coating material in the molten state without affecting the shape; Apparatus therefor
    • C23C2/14—Removing excess of molten coatings; Controlling or regulating the coating thickness
    • C—CHEMISTRY; METALLURGY
    • C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
    • C23C—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THE SURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTION; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL
    • C23C2/00—Hot-dipping or immersion processes for applying the coating material in the molten state without affecting the shape; Apparatus therefor
    • C23C2/26—After-treatment
    • C23C2/28—Thermal after-treatment, e.g. treatment in oil bath
    • C23C2/29—Cooling or quenching
    • C—CHEMISTRY; METALLURGY
    • C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
    • C23C—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THE SURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTION; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL
    • C23C2/00—Hot-dipping or immersion processes for applying the coating material in the molten state without affecting the shape; Apparatus therefor
    • C23C2/34—Hot-dipping or immersion processes for applying the coating material in the molten state without affecting the shape; Apparatus therefor characterised by the shape of the material to be treated
    • C23C2/36—Elongated material
    • C23C2/38—Wires; Tubes
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05D—PROCESSES FOR APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05D1/00—Processes for applying liquids or other fluent materials
    • B05D1/26—Processes for applying liquids or other fluent materials performed by applying the liquid or other fluent material from an outlet device in contact with, or almost in contact with, the surface
    • B05D1/265—Extrusion coatings
    • 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
    • B05D2202/00—Metallic substrate
    • B05D2202/40—Metallic substrate based on other transition elements
    • B05D2202/45—Metallic substrate based on other transition elements based on Cu
    • 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
    • B05D2254/00—Tubes
    • B05D2254/02—Applying the material on the exterior of the tube
    • 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
    • B05D2350/00—Pretreatment of the substrate
    • B05D2350/60—Adding a layer before coating
    • 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
    • B05D2350/00—Pretreatment of the substrate
    • B05D2350/60—Adding a layer before coating
    • B05D2350/65—Adding a layer before coating metal layer
    • 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
    • B05D2505/00—Polyamides
    • 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
    • B05D3/00—Pretreatment of surfaces to which liquids or other fluent materials are to be applied; After-treatment of applied coatings, e.g. intermediate treating of an applied coating preparatory to subsequent applications of liquids or other fluent materials
    • B05D3/002—Pretreatement
    • 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
    • B05D3/00—Pretreatment of surfaces to which liquids or other fluent materials are to be applied; After-treatment of applied coatings, e.g. intermediate treating of an applied coating preparatory to subsequent applications of liquids or other fluent materials
    • B05D3/04—Pretreatment of surfaces to which liquids or other fluent materials are to be applied; After-treatment of applied coatings, e.g. intermediate treating of an applied coating preparatory to subsequent applications of liquids or other fluent materials by exposure to gases
    • B05D3/0466—Pretreatment of surfaces to which liquids or other fluent materials are to be applied; After-treatment of applied coatings, e.g. intermediate treating of an applied coating preparatory to subsequent applications of liquids or other fluent materials by exposure to gases the gas being a non-reacting gas
    • 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
    • B05D5/00—Processes for applying liquids or other fluent materials to surfaces to obtain special surface effects, finishes or structures
    • B05D5/12—Processes for applying liquids or other fluent materials to surfaces to obtain special surface effects, finishes or structures to obtain a coating with specific electrical properties
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B2255/00—Coating on the layer surface
    • B32B2255/06—Coating on the layer surface on metal layer
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B2255/00—Coating on the layer surface
    • B32B2255/28—Multiple coating on one surface
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B2597/00—Tubular articles, e.g. hoses, pipes

Definitions

  • the invention relates to a production method for coated tubes, particularly to providing coated tubes by using chemical materials.
  • the galfan coating process is carried out by galvanization in galfan pots.
  • the adhesion of other coatings onto the galfan coating is strengthened via an additional chemical material. It is dried by heating in order to prevent formation of defects on the surface of the chemical material.
  • CN106808775A publication describes a galvanized steel tube manufacturing process.
  • the galvanized steel tube manufacturing process comprises the steps of: A, coating the outer surface of a steel tube with a hot-melt metal; B, C, coating the surface of the steel tube by being heated inductively and being placed in the galfan pot.
  • A coating the outer surface of a steel tube with a hot-melt metal
  • B C
  • a galfan coated steel tube is achieved which has an easy manufacturing process, low manufacturing costs and long service life thanks to the metal chemical hot-melt in the galvanize pot and the steel tube after the outer surface of the tube is heated.
  • the object of the invention is to enhance the adhesion strength of the polyamide material to the outer surface within the coated metal tube production.
  • the invention relates to a tube coating method comprising the process steps of providing a copper-brazed, double layered steel tube made of a copper coated sheet; heating the outer surface of the tube to a predetermined temperature; coating the heated outer surface of the tube with galfan; cooling the galfan coated outer surface; applying a chemical agent onto the cooled and galfan coated outer surface and obtaining a chemical agent coated outer surface; drying the applied chemical agent; applying primer coating onto the chemical agent coated outer surface by providing a primer solution and obtaining a primer coated outer surface; obtaining a polyamide coated outer surface by applying a polyamide coating onto the primer coated outer surface.
  • the tube coating method comprises the process step of scraping the undried chemical agent off the chemical agent coated outer surface via the scraping device after drying the chemical agent.
  • a chemical agent is applied thereupon.
  • the galfan coated outer surface on which the chemical agent is applied is also dried and undried chemical agent is scraped off the outer surface via the scraping device in order to prevent the defects on the surface.
  • the undried chemical agent on the outer surface prevents an efficient adhesion of the primer, the primer easily peels off the outer surface due to the inadequate adhesion although the polyamide exhibits an efficient adhesion onto the primer due to the polyamide coating application. Therefore, the undried part of the chemical agent is scraped off the outer surface of the tube via the scraping device.
  • the chemical agent on the outer surface on which the chemical agent is applied is dried via an inductive heating process. Therefore, the tube is heated without any contact and defects such as stains and deformations on the surface are prevented. Besides, energy efficiency is high as the heat is produced on the surface of the substance via inductive heating.
  • the chemical agent on the outer surface on which the chemical agent is applied is dried between 50 °C and 80 °C via an inductive heating process. Therefore, the chemical content of the chemical agent is not spoiled.
  • inductive heating process is applied onto the chemical agent on the outer surface on which the chemical agent is applied between 0.5 and 1.5 seconds. Therefore, it is prevented that the temperature value of the chemical agent exceeds the desired temperature value while applying the inductive heating process.
  • the galfan coated outer surface is cooled by being passed through a water-filled tank.
  • the galfan coated tube is cooled to the desired temperature value.
  • the galfan coated outer surface is cooled by being passed through a water-filled tank for 2 to 3 seconds. By this means, a temperature value lower than the desired temperature value is prevented.
  • a polyamide coating is applied onto the primer coated outer surface via an extrusion process.
  • the strength and the surface quality of the tubes are improved.
  • the polyamide coated outer surface is cooled to room temperature with cold water. Therefore, the polymerization is completed and the superficial defects to be formed on the final coating during the cooling process are prevented.
  • nitrogen is sprayed onto the heated outer surface of the tube and/or galfan coated outer surface in order to provide a galfan coating of desired thickness and homogeneity.
  • the thickness of the galfan coating on the tube’s outer surface can be adjusted homogeneously.
  • application of chemical agent onto the galfan coated outer surface is carried out by being immersed in a liquid comprising a chemical agent.
  • a surface with a desired thickness can be provided by coating the chemical agent homogeneously onto the galfan coated outer surface via a chemical reaction.
  • the galfan coated outer surface is immersed in the liquid comprising a chemical agent for 0.05 to 0.25 seconds.
  • the required time is allowed for the chemical agent applied onto the galfan coated outer surface to be coated onto the surface of the tube.
  • an eddy current test is carried out which detects the defects on the outer surface on which the chemical agent is applied after the drying process of the chemical agent. Thanks to the eddy current test, the defects on the tube’s outer surface can be detected and they can be cleaned out.
  • the scraping device is made of a special rubber material. Therefore, any superficial defects to be formed on the outer surface on which the chemical agent is applied can be prevented during the scraping process.
  • Fig. 1 is a schematic view of the coatings on the tube’s outer surface of the present invention.
  • Fig. 2 is a schematic view of the tube coating process steps.
  • Fig. 3 is a cross-sectional view of the scraping device of the present invention.
  • Fig. 1 shows a schematic view of the coatings on the tube’s outer surface.
  • an outer surface (12) of an elongated, copper-brazed, double layered, steel tube (10) is heated via inductive heating, then sent to a galfan pot for galfan coating, and passed through a molten metal of zinc+aluminum having a temperature value of 475-550 °C.
  • the outer surface (12) of the tube (10) is coated with galfan having an average thickness of about 10 microns within the galfan pot.
  • a galfan coated outer surface (14) is achieved.
  • the thickness of the galfan coated outer surface (14) is adjusted by spraying nitrogen thereon at the outlet of the galfan pot.
  • the galfan coated outer surface (14) is cooled at the outlet of the galfan pot via a quenching process. After the cooling process, the galfan coated outer surface (14) is immersed into a special solution comprising a chemical agent.
  • a chemical agent coated outer surface (16) is achieved by applying a chemical agent onto the galfan coated outer surface (14) via the immersing process.
  • the chemical agent coated outer surface (16) is dried at a temperature between 50 °C and 80 °C via an inductive heating method. After the completion of the drying process, it is passed through a scraping device (20) in order to scrape the undried chemical agent off the chemical agent coated outer surface (16). After being passed through the scraping device (20), a primer coated outer surface (18) is achieved by applying a primer solution onto the chemical agent coated outer surface (16).
  • a polyamide coated outer surface (19) is achieved by applying a polyamide coating onto the primer coated outer surface (18) via an extrusion method.
  • An embodiment of a polyamide coated metal tube (10) is provided by cooling the polyamide coated outer surface (19) to the room temperature by cooling with water.
  • Fig. 2 shows a schematic view of the tube coating process steps.
  • the outer surface (12) of the tube (10) provided is heated (1 ) up to a predetermined temperature.
  • the galfan coated outer surface (14) is obtained by applying a galfan coating (2) onto the outer surface (12) of the tube (10) along with a heating process by being passed through a galfan pot (molten zinc+aluminum bar of max 550 °C).
  • the galfan coated outer surface (14) is cooled (3) via a quenching process.
  • the cooling process is carried out by passing through cold water having a temperature of 10 °C to 15 °C.
  • the quenching process is applied onto the galfan coated outer surface (14) between 2 and 3 seconds.
  • a chemical agent is applied (4) onto the cooled galfan coated outer surface (14).
  • the chemical agent application (4) is carried out by passing the galfan coated outer surface (14) through a liquid filled with the chemical agent.
  • the galfan coated outer surface (14) is exposed to the liquid filled with the chemical agent for 0.15 seconds and thus, a chemical agent coated outer surface (16) is obtained.
  • the chemical agent is dried (5) between the temperature value between 50 °C and 80 °C via an inductive heating process on the chemical agent coated outer surface (16).
  • the undried chemical agent is scraped off (6) the chemical agent coated outer surface (16) via a scraping device (20).
  • the primer coating is applied (7) by adding a primer solution onto the chemical agent coated outer surface (16) and the primer coated outer surface (18) is obtained.
  • a polyamide coated outer surface (19) is achieved by applying a polyamide coating (8) onto the primer coated outer surface (18) via an extrusion method.
  • the primer coating is an intermediate layer used to provide the adhesion of the polyamide coating which is the final coating.
  • the chemical agent application facilitates an easier adhesion of the primer coating and prevents peeling off the tube (10). Therefore, the peeling of the coatings off the tube (10) is prevented by achieving the desired adhesion criteria.
  • Fig. 3 shows a cross-sectional view of the scraping device.
  • the scraping device (20) comprises an opening (22) equal to the external diameter of the tube (10) in the center.
  • the tube (10) having a chemical agent coated outer surface (14) is passed through the opening (22) and the undried chemical agents on the tube (10) is scraped off.
  • the scraping device (20) is rectangular or have a similar form in any kind of geometric shape, and is made of a rubber material.

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  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Organic Chemistry (AREA)
  • Materials Engineering (AREA)
  • Metallurgy (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Wood Science & Technology (AREA)
  • General Chemical & Material Sciences (AREA)
  • Physics & Mathematics (AREA)
  • Oil, Petroleum & Natural Gas (AREA)
  • Thermal Sciences (AREA)
  • Application Of Or Painting With Fluid Materials (AREA)

Abstract

The invention relates to a tube coating method comprising the process steps of providing a double layered steel tube (10) made of a copper coated sheet; heating (1) the outer surface (12) of the tube (10) to a predetermined temperature; coating (2) the heated outer surface (12) of the tube with galfan; cooling (3) the galfan coated outer surface (14); applying (4) a chemical agent onto the cooled and galfan coated outer surface (14) and obtaining a chemical agent coated outer surface (16); drying (5) the applied chemical agent; applying (7) a primer coating onto the chemical agent coated outer surface (16) by providing a primer solution and obtaining a primer coated outer surface (18); obtaining a polyamide coated outer surface (19) by applying (8) a polyamide coating onto the primer coated outer surface (18). The tube coating method further comprises the process step of scraping (6) the undried chemical agent off the chemical agent coated outer surface (14) via the scraping device (20) after the chemical agent is dried (5).

Description

COATING METHOD FOR COATED TUBES
TECHNICAL FIELD
The invention relates to a production method for coated tubes, particularly to providing coated tubes by using chemical materials.
PRIOR ART
There are various coating methods available for producing coated tubes. Generally, the galfan coating process is carried out by galvanization in galfan pots. There is an adhesion problem of the new coatings applied upon the galfan coating when there is an additional coating process. The adhesion of other coatings onto the galfan coating is strengthened via an additional chemical material. It is dried by heating in order to prevent formation of defects on the surface of the chemical material.
The use of chemical materials to produce coated metal tubes is known in the technical field. CN106808775A publication describes a galvanized steel tube manufacturing process. The galvanized steel tube manufacturing process comprises the steps of: A, coating the outer surface of a steel tube with a hot-melt metal; B, C, coating the surface of the steel tube by being heated inductively and being placed in the galfan pot. According to the galvanized steel tube manufacturing process mentioned in the invention, a galfan coated steel tube is achieved which has an easy manufacturing process, low manufacturing costs and long service life thanks to the metal chemical hot-melt in the galvanize pot and the steel tube after the outer surface of the tube is heated.
BRIEF DESCRIPTION OF THE INVENTION
The object of the invention is to enhance the adhesion strength of the polyamide material to the outer surface within the coated metal tube production.
In order to achieve the above mentioned object, the invention relates to a tube coating method comprising the process steps of providing a copper-brazed, double layered steel tube made of a copper coated sheet; heating the outer surface of the tube to a predetermined temperature; coating the heated outer surface of the tube with galfan; cooling the galfan coated outer surface; applying a chemical agent onto the cooled and galfan coated outer surface and obtaining a chemical agent coated outer surface; drying the applied chemical agent; applying primer coating onto the chemical agent coated outer surface by providing a primer solution and obtaining a primer coated outer surface; obtaining a polyamide coated outer surface by applying a polyamide coating onto the primer coated outer surface. The tube coating method comprises the process step of scraping the undried chemical agent off the chemical agent coated outer surface via the scraping device after drying the chemical agent. After the galfan coating process of the tube outer surface, a chemical agent is applied thereupon. Thereby, the coating strength of the primer solution used for the primer coating onto the galfan coated outer surface is enhanced. The galfan coated outer surface on which the chemical agent is applied is also dried and undried chemical agent is scraped off the outer surface via the scraping device in order to prevent the defects on the surface. As the undried chemical agent on the outer surface prevents an efficient adhesion of the primer, the primer easily peels off the outer surface due to the inadequate adhesion although the polyamide exhibits an efficient adhesion onto the primer due to the polyamide coating application. Therefore, the undried part of the chemical agent is scraped off the outer surface of the tube via the scraping device.
In a preferred embodiment of the invention, the chemical agent on the outer surface on which the chemical agent is applied is dried via an inductive heating process. Therefore, the tube is heated without any contact and defects such as stains and deformations on the surface are prevented. Besides, energy efficiency is high as the heat is produced on the surface of the substance via inductive heating.
In a preferred embodiment of the invention, the chemical agent on the outer surface on which the chemical agent is applied is dried between 50 °C and 80 °C via an inductive heating process. Therefore, the chemical content of the chemical agent is not spoiled.
In a preferred embodiment of the invention, inductive heating process is applied onto the chemical agent on the outer surface on which the chemical agent is applied between 0.5 and 1.5 seconds. Therefore, it is prevented that the temperature value of the chemical agent exceeds the desired temperature value while applying the inductive heating process.
In a preferred embodiment of the invention, the galfan coated outer surface is cooled by being passed through a water-filled tank. Thus, the galfan coated tube is cooled to the desired temperature value. In a preferred embodiment of the invention, the galfan coated outer surface is cooled by being passed through a water-filled tank for 2 to 3 seconds. By this means, a temperature value lower than the desired temperature value is prevented.
In a preferred embodiment of the invention, a polyamide coating is applied onto the primer coated outer surface via an extrusion process. Thus, the strength and the surface quality of the tubes are improved.
In a preferred embodiment of the invention, the polyamide coated outer surface is cooled to room temperature with cold water. Therefore, the polymerization is completed and the superficial defects to be formed on the final coating during the cooling process are prevented.
In a preferred embodiment of the invention, nitrogen is sprayed onto the heated outer surface of the tube and/or galfan coated outer surface in order to provide a galfan coating of desired thickness and homogeneity. Thus, the thickness of the galfan coating on the tube’s outer surface can be adjusted homogeneously.
In a preferred embodiment of the invention, application of chemical agent onto the galfan coated outer surface is carried out by being immersed in a liquid comprising a chemical agent. Thus, a surface with a desired thickness can be provided by coating the chemical agent homogeneously onto the galfan coated outer surface via a chemical reaction.
In a preferred embodiment of the invention, the galfan coated outer surface is immersed in the liquid comprising a chemical agent for 0.05 to 0.25 seconds. Thus, the required time is allowed for the chemical agent applied onto the galfan coated outer surface to be coated onto the surface of the tube.
In a preferred embodiment of the invention, an eddy current test is carried out which detects the defects on the outer surface on which the chemical agent is applied after the drying process of the chemical agent. Thanks to the eddy current test, the defects on the tube’s outer surface can be detected and they can be cleaned out.
In a preferred embodiment of the invention, the scraping device is made of a special rubber material. Therefore, any superficial defects to be formed on the outer surface on which the chemical agent is applied can be prevented during the scraping process. BRIEF DESCRIPTION OF THE DRAWINGS
Fig. 1 is a schematic view of the coatings on the tube’s outer surface of the present invention.
Fig. 2 is a schematic view of the tube coating process steps.
Fig. 3 is a cross-sectional view of the scraping device of the present invention.
DETAILED DESCRIPTION OF THE INVENTION
In this detailed description, the embodiment of the present invention is described in a nonlimiting way and with reference to the examples with the aim of better clarifying.
Fig. 1 shows a schematic view of the coatings on the tube’s outer surface. Firstly, an outer surface (12) of an elongated, copper-brazed, double layered, steel tube (10) is heated via inductive heating, then sent to a galfan pot for galfan coating, and passed through a molten metal of zinc+aluminum having a temperature value of 475-550 °C. The outer surface (12) of the tube (10) is coated with galfan having an average thickness of about 10 microns within the galfan pot. At the outlet of the galfan pot, a galfan coated outer surface (14) is achieved. The thickness of the galfan coated outer surface (14) is adjusted by spraying nitrogen thereon at the outlet of the galfan pot. The galfan coated outer surface (14) is cooled at the outlet of the galfan pot via a quenching process. After the cooling process, the galfan coated outer surface (14) is immersed into a special solution comprising a chemical agent. A chemical agent coated outer surface (16) is achieved by applying a chemical agent onto the galfan coated outer surface (14) via the immersing process. The chemical agent coated outer surface (16) is dried at a temperature between 50 °C and 80 °C via an inductive heating method. After the completion of the drying process, it is passed through a scraping device (20) in order to scrape the undried chemical agent off the chemical agent coated outer surface (16). After being passed through the scraping device (20), a primer coated outer surface (18) is achieved by applying a primer solution onto the chemical agent coated outer surface (16). A polyamide coated outer surface (19) is achieved by applying a polyamide coating onto the primer coated outer surface (18) via an extrusion method. An embodiment of a polyamide coated metal tube (10) is provided by cooling the polyamide coated outer surface (19) to the room temperature by cooling with water. Fig. 2 shows a schematic view of the tube coating process steps. The outer surface (12) of the tube (10) provided is heated (1 ) up to a predetermined temperature. The galfan coated outer surface (14) is obtained by applying a galfan coating (2) onto the outer surface (12) of the tube (10) along with a heating process by being passed through a galfan pot (molten zinc+aluminum bar of max 550 °C). The galfan coated outer surface (14) is cooled (3) via a quenching process. The cooling process is carried out by passing through cold water having a temperature of 10 °C to 15 °C. The quenching process is applied onto the galfan coated outer surface (14) between 2 and 3 seconds. A chemical agent is applied (4) onto the cooled galfan coated outer surface (14). The chemical agent application (4) is carried out by passing the galfan coated outer surface (14) through a liquid filled with the chemical agent. The galfan coated outer surface (14) is exposed to the liquid filled with the chemical agent for 0.15 seconds and thus, a chemical agent coated outer surface (16) is obtained. The chemical agent is dried (5) between the temperature value between 50 °C and 80 °C via an inductive heating process on the chemical agent coated outer surface (16). After the chemical agent is dried (5), the undried chemical agent is scraped off (6) the chemical agent coated outer surface (16) via a scraping device (20). The primer coating is applied (7) by adding a primer solution onto the chemical agent coated outer surface (16) and the primer coated outer surface (18) is obtained. A polyamide coated outer surface (19) is achieved by applying a polyamide coating (8) onto the primer coated outer surface (18) via an extrusion method. The primer coating is an intermediate layer used to provide the adhesion of the polyamide coating which is the final coating. The chemical agent application facilitates an easier adhesion of the primer coating and prevents peeling off the tube (10). Therefore, the peeling of the coatings off the tube (10) is prevented by achieving the desired adhesion criteria.
Fig. 3 shows a cross-sectional view of the scraping device. The scraping device (20) comprises an opening (22) equal to the external diameter of the tube (10) in the center. The tube (10) having a chemical agent coated outer surface (14) is passed through the opening (22) and the undried chemical agents on the tube (10) is scraped off. The scraping device (20) is rectangular or have a similar form in any kind of geometric shape, and is made of a rubber material. REFERENCE NUMERALS
1 Heating the outer surface of the tube 14 Galfan coated outer surface
2 Galfan coating of the tube’s outer 16 Chemical agent coated outer surface surface
3 Cooling the outer surface with water 18 Primer coated outer surface
4 Chemical agent application 19 Polyamide coated outer surface
5 Drying of the chemical agent 20 Scraping device
6 Scraping off the chemical agent 22 Opening
7 Primer coating application
8 Polyamide coating application
9 Cooling with water
10 Tube
12 Outer surface

Claims

1 - A tube coating method comprising the process steps of providing a double layered steel tube (10) made of a copper coated sheet; heating (1 ) the outer surface (12) of the tube (10) to a predetermined temperature; coating (2) the heated outer surface (12) of the tube with galfan; cooling (3) the galfan coated outer surface (14); applying (4) a chemical agent onto the cooled and galfan coated outer surface (14) and obtaining a chemical agent coated outer surface (16); drying (5) the applied chemical agent; applying (7) a primer coating onto the chemical agent coated outer surface (16) by providing a primer solution and obtaining a primer coated outer surface (18); obtaining a polyamide coated outer surface (19) by applying (8) a polyamide coating onto the primer coated outer surface (18), characterized by the process step of scraping (6) the undried chemical agent off the chemical agent coated outer surface (14) via a scraping device (20) after the chemical is dried (5).
2- The tube coating method according to claim 1 , further comprising the process step of drying (5) the chemical agent on the outer surface (16) on which the chemical agent is applied via an inductive heating process.
3- The tube coating method according to claim 2, further comprising the process step of drying the chemical agent on the outer surface (16) on which the chemical agent is applied via an inductive heating process between the temperature values of 50 °C and 80 °C.
4- The tube coating method according to claims 2-3, further comprising the process step of applying the inductive heating process onto the chemical agent on the outer surface (16) on which the chemical agent is applied for 0.5 to 1 .5 seconds.
5- The tube coating method according to any one of the preceding claims, further comprising the process step of cooling the galfan coated outer surface (14) by passing through a water-filled tank.
6- The tube coating method according to claim 5, further comprising the process step of passing the galfan coated outer surface (14) through a water-filled tank for 2 to 3 seconds.
7- The tube coating method according to any one of the preceding claims, further comprising the process step of applying (8) a polyamide coating onto the primer coated outer surface (18) via an extrusion process. 8- The tube coating method according to any one of the preceding claims, further comprising the process step of cooling the polyamide coated outer surface (19) up to room temperature with cold water.
9- The tube coating method according to any one of the preceding claims, further comprising the process step of spraying nitrogen onto the heated outer surface (12) of the tube and/or galfan coated outer surface (14) in order to provide a galfan coating of desired thickness and homogeneity.
10- The tube coating method according to any one of the preceding claims, wherein the application of chemical agent (4) onto the galfan coated outer surface (14) is carried out by being immersed in a liquid filled with a chemical agent.
11 - The tube coating method according to claim 10, wherein the galfan coated outer surface (14) is immersed in the liquid comprising a chemical agent for 0.05 to 0.25 seconds.
12- The tube coating method according to any one of the preceding claims, wherein the process step of applying an eddy current test detecting the defects of the chemical agent coated outer surface (16) after the chemical agent is dried (5).
13- A scraping device made of rubber material for the tube coating method according to any one of the preceding claims.
PCT/TR2021/050097 2021-02-02 2021-02-02 Coating method for coated tubes WO2022169427A1 (en)

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Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4173290A (en) * 1978-02-07 1979-11-06 Toyo Seikan Kaisha, Ltd. Bonded can having high hot water resistance and undercoating composition for use in production thereof
US20050276983A1 (en) * 2001-10-17 2005-12-15 Seiji Kashiwada Metal object-coating method and primer composition used in the same
CN102703846B (en) * 2012-06-12 2015-06-24 常州大学 Hot dip coating Zn-Al-Zr alloy coating and hot dip coating method of hot dip coating Zn-Al-Zr alloy coating

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4173290A (en) * 1978-02-07 1979-11-06 Toyo Seikan Kaisha, Ltd. Bonded can having high hot water resistance and undercoating composition for use in production thereof
US20050276983A1 (en) * 2001-10-17 2005-12-15 Seiji Kashiwada Metal object-coating method and primer composition used in the same
CN102703846B (en) * 2012-06-12 2015-06-24 常州大学 Hot dip coating Zn-Al-Zr alloy coating and hot dip coating method of hot dip coating Zn-Al-Zr alloy coating

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