WO2023013482A1 - Tuyau en acier et procédé de revêtement d'un tuyau en acier - Google Patents

Tuyau en acier et procédé de revêtement d'un tuyau en acier Download PDF

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Publication number
WO2023013482A1
WO2023013482A1 PCT/JP2022/028798 JP2022028798W WO2023013482A1 WO 2023013482 A1 WO2023013482 A1 WO 2023013482A1 JP 2022028798 W JP2022028798 W JP 2022028798W WO 2023013482 A1 WO2023013482 A1 WO 2023013482A1
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Prior art keywords
steel pipe
mass
coating
particles
zinc
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PCT/JP2022/028798
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English (en)
Japanese (ja)
Inventor
美咲 伊場
雅子 秋山
真彦 松川
睦 谷本
徹 松原
祥友 鈴木
Original Assignee
日本ペイント・サーフケミカルズ株式会社
大和鋼管工業株式会社
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Priority to JP2023540278A priority Critical patent/JPWO2023013482A1/ja
Publication of WO2023013482A1 publication Critical patent/WO2023013482A1/fr

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    • 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
    • B05D1/02—Processes for applying liquids or other fluent materials performed by spraying
    • 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
    • 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
    • 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
    • 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
    • B05D7/22—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 internal surfaces, e.g. of 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
    • 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
    • B05D7/24—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 for applying particular liquids or other fluent materials
    • C—CHEMISTRY; METALLURGY
    • C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
    • C09D—COATING COMPOSITIONS, e.g. PAINTS, VARNISHES OR LACQUERS; FILLING PASTES; CHEMICAL PAINT OR INK REMOVERS; INKS; CORRECTING FLUIDS; WOODSTAINS; PASTES OR SOLIDS FOR COLOURING OR PRINTING; USE OF MATERIALS THEREFOR
    • C09D1/00—Coating compositions, e.g. paints, varnishes or lacquers, based on inorganic substances
    • C—CHEMISTRY; METALLURGY
    • C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
    • C09D—COATING COMPOSITIONS, e.g. PAINTS, VARNISHES OR LACQUERS; FILLING PASTES; CHEMICAL PAINT OR INK REMOVERS; INKS; CORRECTING FLUIDS; WOODSTAINS; PASTES OR SOLIDS FOR COLOURING OR PRINTING; USE OF MATERIALS THEREFOR
    • C09D5/00—Coating compositions, e.g. paints, varnishes or lacquers, characterised by their physical nature or the effects produced; Filling pastes
    • C09D5/08—Anti-corrosive paints
    • C09D5/10—Anti-corrosive paints containing metal dust
    • 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

Definitions

  • the present invention relates to a steel pipe and a coating method for the steel pipe.
  • metal materials such as steel pipes coated with a coating composition containing metal powder such as zinc that exerts a sacrificial anti-corrosion effect as an antirust pigment have been known.
  • a coating composition a water-based coating composition is widely used, which is preferable from the viewpoint of reducing environmental load (see, for example, Patent Document 1).
  • Patent Document 1 The technique disclosed in Patent Document 1 is said to be able to improve the adhesion between the formed film and the substrate by including an aqueous resin emulsion as a binder in the coating composition.
  • an aqueous resin emulsion as a binder in the coating composition.
  • a sufficient sacrificial anti-corrosion effect cannot be obtained due to the resin component contained in the coating composition.
  • a highly corrosion-resistant film cannot be formed when the base material is at a high temperature when the steel pipe is coated.
  • the present invention has been made in view of the above problems, and an object of the present invention is to provide a steel pipe in which preferable corrosion resistance can be obtained even when the base material is at a high temperature when the steel pipe is coated. Another object of the present invention is to provide a coating method that provides favorable coating workability when coating a steel pipe.
  • the present invention provides a steel pipe having on its inner surface a cured coating film formed from a coating composition, wherein the coating composition comprises spherical zinc particles (A) having an average particle size of 3 to 15 ⁇ m. And, aluminum particles (B), aluminum compound particles (C), epoxy group-containing silane coupling agent (D), silica particles (E), dipropylene glycol (F), water (G), including, (A) + (B) + (C) is 20 to 40% by mass, (D) / ((A) + (B) + (C)) is 20 to 50% by mass, ( E) is 0.3 to 1.0% by mass, (F) / ((F) + (G)) is 20 to 50% by mass, and the content of zinc in the cured coating film is converted to zinc element is 6.5-15 g/m 2 and the thickness of said steel pipe is 0.5-5 mm.
  • the coating composition comprises spherical zinc particles (A) having an average particle size of 3 to 15 ⁇ m.
  • the total content of water-based resins selected from the group consisting of water-soluble resins, water-based resin emulsions, cellulosic resins, and polysaccharides is The steel pipe according to [1], which is 0.15% by mass or less.
  • the present invention also provides a method for coating a steel pipe, comprising a step (1) of preheating the steel pipe, a step (2) of spray-coating the inner surface of the steel pipe with a coating composition, and a step (3) of drying the object to form a cured coating film, wherein the steel pipe has a thickness of 0.5 to 5 mm, and the coating composition is spherical and has an average particle diameter of 3 to 15 ⁇ m zinc particles (A), aluminum particles (B), aluminum compound particles (C), epoxy group-containing silane coupling agent (D), silica particles (E), and dipropylene glycol (F) and water (G), wherein (A) + (B) + (C) is 20 to 40% by mass, and (D) / ((A) + (B) + (C)) is 20 to 50% by mass, (E) is 0.3 to 1.0% by mass, (F)/((F)+(G)) is 20 to 50% by mass, and the step (3) 3, relates to a method of coating a steel pipe
  • the total content of water-based resins selected from the group consisting of water-soluble resins, water-based resin emulsions, cellulosic resins, and polysaccharides is 0 with respect to the total mass of the coating composition.
  • the present invention it is possible to provide a steel pipe that exhibits favorable corrosion resistance even when the base material is at a high temperature when the steel pipe is coated.
  • a coating method by which preferable coating workability can be obtained when coating steel pipes it is possible to provide a coating method by which preferable coating workability can be obtained when coating steel pipes.
  • FIG. 1 is a flowchart showing a steel pipe manufacturing process to which a steel pipe coating method according to an embodiment of the present invention can be applied.
  • the steel pipe according to the present embodiment is, for example, a steel pipe whose outer surface is coated with metal plating.
  • the metal used for metal plating is preferably zinc, but may be an alloy such as zinc and aluminum, or other metals.
  • the shape of the steel pipe is not particularly limited as long as it is a cylindrical body, and it may be a cylindrical body having an irregular cross-section such as a cylindrical shape, a square tube shape, or a polygonal shape.
  • the thickness of the steel pipe is 0.5-5 mm.
  • the outer diameter of the steel pipe is not particularly limited, it is, for example, 10 to 100 mm.
  • the steel pipe according to this embodiment has on its inner surface a cured coating film formed from the coating composition described below.
  • the coating composition according to the present embodiment can impart preferable corrosion resistance to the base material.
  • the coating composition according to the present embodiment is a water-based coating composition comprising zinc particles (A), aluminum particles (B), aluminum compound particles (C), and an epoxy group-containing silane coupling agent (D). , silica particles (E), dipropylene glycol (F), and water (G). Moreover, it is preferable that the coating composition according to the present embodiment does not substantially contain a resin.
  • substantially free of resin means that the total content of water-based resins selected from the group consisting of water-soluble resins, water-based resin emulsions, cellulosic resins, and polysaccharides is It means 0.15% by mass or less relative to the total mass of the composition.
  • the total content of the aqueous resin is preferably 0.10% by mass or less, more preferably 0.05% by mass or less.
  • the cellulose-based resin is a resin containing cellulose, and examples thereof include alkyl group-containing cellulose, hydroxy group-containing cellulose, carboxy group-containing cellulose, and derivatives thereof.
  • Specific examples of the cellulose-based resin include inorganic acid esters such as hydroxyethyl cellulose, methyl cellulose, methyl hydroxypropyl cellulose, ethyl hydroxyethyl cellulose, methyl ethyl cellulose, cellulose acetate, cellulose nitrate and cellulose phosphate, and acetylated hydroxypropyl cellulose. and cellulose ether esters of.
  • the above-mentioned polysaccharides mean polysaccharides other than the above-mentioned cellulose-based resins and derivatives thereof.
  • the zinc particles (A) are an antirust pigment component, and have a high ionization tendency with respect to the base material, which is the object to be coated, so that they are oxidized before the base material and exhibit a sacrificial anticorrosion effect.
  • the zinc particles (A) are particles containing zinc, and the zinc particles (A) in this specification mainly contain zinc alone, a zinc alloy containing zinc as a main component, or zinc oxide (that is, zinc alone, the above Zinc alloys and metal particles in which the total amount of zinc oxide is 50% by mass or more).
  • the shape of the zinc particles (A) is spherical.
  • the zinc particles When the zinc particles are spherical, the zinc particles tend to become dense in the cured coating film formed from the coating composition, and a favorable sacrificial anticorrosion effect can be obtained.
  • the concept of spherical zinc particles includes not only true spheres but also elliptical spheres obtained by deforming true spheres.
  • the spherical zinc particles preferably have an average aspect ratio (average length/average thickness) of 2 or less.
  • the average particle size of the zinc particles (A) is 3-15 ⁇ m.
  • the average particle size of the zinc particles (A) is less than 3 ⁇ m, workability and liquid stability during preparation of the coating composition are lowered. Moreover, the adhesiveness and corrosion resistance of the cured coating film to be formed are lowered. If the average particle size of the zinc particles (A) exceeds 15 ⁇ m, the surface area per unit mass of the zinc particles (A) is reduced, and a preferable sacrificial anticorrosion effect cannot be obtained. From the above viewpoint, the average particle size of the zinc particles (A) is preferably 3 ⁇ m to 5 ⁇ m.
  • the average particle size means a volume-based average particle size, and can be measured with a particle size distribution measuring device using a laser diffraction/scattering method.
  • the zinc particles (A) a commercially available product can be used, and specific examples include zinc powder series manufactured by Nippon Paint Anticorrosion Coatings Co., Ltd., and the like.
  • the aluminum particles (B) are an anticorrosion pigment component, and the inclusion of the aluminum particles (B) in the coating composition provides the same sacrificial anticorrosion effect as the zinc particles (A).
  • the base material by coating the base material with an oxide film formed by aluminum, it is thought that the elution of iron, etc. contained in the base material and zinc in the cured coating film is suppressed, and the sacrificial anti-corrosion effect of the zinc particles (A) In combination with the coating effect, more preferable corrosion resistance can be imparted to the base material.
  • the aluminum constituting the aluminum particles (B) is not particularly limited, and may be aluminum alone or an aluminum alloy.
  • the aluminum compound particles (C) are an antirust pigment component like the aluminum particles (B).
  • the aluminum compound constituting the aluminum compound particles (C) is not particularly limited, and examples thereof include aluminum dihydrogen tripolyphosphate, zinc aluminum polyphosphate hydrate, and condensed aluminum phosphate.
  • the aluminum phosphate-based compound containing a phosphoric acid-based compound in the structure as the aluminum compound particles (C) the phosphoric acid-based compound and the iron contained in the base material or the zinc contained in the cured coating film are combined. Since a passivation film is formed, more preferable corrosion resistance can be imparted to the base material.
  • the aluminum particles (B) and the aluminum compound particles (C) in the present specification are alloys and metals mainly containing the above aluminum or aluminum compound (that is, the total amount of the above aluminum or aluminum compound is 50% by mass or more).
  • Particles means aluminum compound particles.
  • the aluminum particles (B) and the aluminum compound particles (C) commercially available powders or pastes can be used.
  • (A) + (B) + (C), which is the total of zinc particles (A) and aluminum particles (B), and aluminum compound particles (C), which are rust preventive pigment components, is 20 to 40% by mass relative to the Thereby, the cured coating film formed from the coating composition can impart preferable corrosion resistance to the substrate. If (A)+(B)+(C) is less than 20% by mass, the sacrificial anti-corrosion effect of the anticorrosive pigment component will be insufficient. Further, when (A) + (B) + (C) exceeds 40% by mass, the cured coating film is not uniformly formed, and corrosion resistance decreases due to decreased adhesion, and sufficient corrosion resistance of the cured coating film cannot be obtained. do not have. From the above viewpoint, (A)+(B)+(C) is preferably 30 to 40% by mass, more preferably 35 to 40% by mass.
  • (A)/(B)+(C) which is the mass ratio of zinc particles (A) to the sum of aluminum particles (B) and aluminum compound particles (C), is 1.5 to 7.5. preferable. If (A)/(B)+(C) is less than 1.5, separation or the like occurs in the coating composition, resulting in decreased liquid stability and reduced workability, resulting in a cured coating film. Corrosion resistance of If (A)/(B)+(C) exceeds 7.5, the elution of zinc from the cured coating tends to proceed, especially in a wet environment, and the corrosion resistance of the cured coating decreases due to zinc depletion. . From the above viewpoints, (A)/(B)+(C) is more preferably 2.5 to 6.5, even more preferably 2.5 to 5.5.
  • Epoxy group-containing silane coupling agent (D) The epoxy group-containing silane coupling agent (D) functions as a cross-linking agent between the substrate and the antirust pigment component, or between the antirust pigment components, and improves the adhesion between the cured coating film formed from the coating composition and the substrate. improve.
  • the epoxy group-containing silane coupling agent (D) has the effect of stabilizing the zinc particles (A) contained in the coating composition.
  • Acidic components such as boric acid, molybdic acid, etc. may be included in conventional coating compositions to stabilize the zinc particles.
  • the coating composition according to the present embodiment can stabilize the zinc particles (A) with the epoxy group-containing silane coupling agent (D), the coating composition does not contain acidic components such as boric acid and molybdic acid. can be configured.
  • the type of epoxy group-containing silane coupling agent (D) is not particularly limited, but a silicone compound having a reactive functional group such as an alkoxysilyl group or an acryl group may be used in addition to the epoxy group.
  • epoxy group-containing silane coupling agents (D) include, for example, 3-glycidoxypropyltrimethoxysilane, 3-glycidoxypropyltriethoxysilane, 3-glycidoxypropylmethyldimethoxysilane, 2-( 3,4-epoxycyclohexyl)ethyltrimethoxysilane, 2-(3,4-epoxycyclohexyl)ethyltriethoxysilane and the like.
  • An oligomer type silane coupling agent may be used as the epoxy group-containing silane coupling agent (D).
  • the oligomer-type silane coupling agent is a relatively low-molecular-weight polymer having both an organic functional group and an alkoxysilyl group, for example, a 2- to 20-mer.
  • the above oligomer type silane coupling agent may be produced by a known method or may be obtained as a commercial product. Commercially available products include, for example, “KR-516”, “KR-517” (all of the above trade names: manufactured by Shin-Etsu Chemical Co., Ltd.). In this specification, the concept of "resin” does not include the epoxy group-containing silane coupling agent (D).
  • the epoxy group-containing silane coupling agent (D) may be used alone, or may be used in combination.
  • (D)/((A) + (B) + (C)) exceeds 50% by mass, the epoxy group-containing silane coupling agent (D) inhibits the sacrificial anti-corrosion effect of the anti-rust pigment component, Sufficient corrosion resistance of the formed cured coating film cannot be obtained.
  • (D)/((A)+(B)+(C)) is preferably 20 to 40% by mass, more preferably 20 to 30% by mass.
  • the content of the epoxy group-containing silane coupling agent (D) is preferably 20 to 45% by mass, more preferably 20 to 35% by mass, with respect to the content of the zinc particles (A), which is an antirust pigment component. It is more preferable to have Thereby, the zinc particles (A) can be stabilized by the epoxy group-containing silane coupling agent (D) in the coating composition.
  • Silica particles (E) can improve the paintability of the coating composition by being contained in the coating composition.
  • silica particles (E) known silica particles can be used.
  • specific examples of the silica particles (E) commercially available aerosil powder silica particles such as the AEROSIL (registered trademark) series (manufactured by Evonik Industries AG) can be used.
  • the silica particles (E) are contained in the coating composition in an amount of 0.3 to 1.0% by mass, preferably 0.4 to 0.6% by mass.
  • Dipropylene glycol (F) functions together with water (G) as a solvent that dissolves or disperses each component of the coating composition.
  • Dipropylene glycol (F) contributes to liquid stability by being contained in the coating composition.
  • the film-forming property of the cured coating film formed from the coating composition is improved, and a more uniform and smooth cured coating film is formed.
  • Dipropylene glycol (F) is a water-soluble organic compound and has a volume expansion rate of 500 times or less from liquid to gas. As a result, volumetric expansion when water as a solvent evaporates can be reduced, and the influence of the Leidenfrost phenomenon can be reduced.
  • V2 is calculated from the density (20° C.) of dipropylene glycol (F).
  • the volumetric expansion rate of dipropylene glycol calculated according to the above is about 316 times.
  • the content of dipropylene glycol (F) is such that (F)/((F)+(G)), which is the mass ratio to the total of dipropylene glycol (F) and water (G), is 20 to 50% by mass. be.
  • (F)/((F)+(G)) is less than 20% by mass, the effect of reducing the Leidenfrost phenomenon is not sufficiently obtained, and the paintability deteriorates. If (F)/((F)+(G)) exceeds 50% by mass, the solvent will remain in the cured coating film, resulting in poor adhesion and corrosion resistance.
  • (F)/((F)+(G)) is preferably 20 to 45% by mass, more preferably 25 to 40% by mass.
  • the coating composition may contain components other than those mentioned above, if necessary.
  • metals other than zinc and aluminum, such as magnesium, may be included as rust preventive pigment components.
  • known paint additives such as extender pigments, coloring pigments and dyes may be added as necessary.
  • the coating composition according to the present embodiment since the coating composition according to the present embodiment has preferable liquid stability, it may not contain acidic components such as boric acid and molybdic acid, but may contain them.
  • the coating composition may contain solvents other than dipropylene glycol (F) as necessary. However, if a solvent other than dipropylene glycol (F) is included, the content should be within a range that does not impair the effects of the present invention.
  • the method for preparing the coating composition is not particularly limited, and for example, a known method of blending and mixing the above-described components can be used.
  • the coating composition forms a cured coating film on the inner surface of the steel pipe to be coated.
  • the film thickness of the cured coating film is preferably in the range of 5 to 15 ⁇ m.
  • the content of zinc in the cured coating film is 6.5 to 15 g/m 2 in terms of elemental zinc.
  • the zinc content is preferably 8 to 15 g/m 2 in terms of zinc element.
  • the method for coating a steel pipe according to the present embodiment includes a step (1) of preheating the steel pipe, a step (2) of spray-coating a coating composition on the inner surface of the steel pipe, and drying the coating composition to form a cured coating film. and a step (3) of forming
  • the steel pipe manufacturing process according to the present embodiment includes a roll forming process S1, a welding process S2, an inner surface spray coating process S3, a drying process S4, an outer surface hot dip galvanizing process S5, a sizing process S6, and a cutting process S7. and have Of the above steps, the welding step S2 corresponds to the step (1) of preheating the steel pipe, and the inner surface spray coating step S3 corresponds to the step (2) of spray coating the inner surface of the steel pipe with the coating composition. , the drying step S4 corresponds to the step (3) of drying the coating composition to form a cured coating film.
  • Step (3) may use any step of heating the steel pipe (for example, other steps known as steel pipe manufacturing steps) other than the drying step S4.
  • the heat generated in the outer surface hot-dip galvanizing step S5 may be used to dry the coating composition to form a cured coating film.
  • pipe making and hot-dip galvanizing can be performed in the same production line.
  • the roll forming step S1 is a step of cold forming the steel plate supplied from the uncoiler into a tubular shape having an arbitrary shape using a forming device.
  • the welding process S2 is a process in which the longitudinal end faces of the steel plates are used as joints and continuously welded. Through the welding step S2, a steel pipe, which is a single continuous tubular body, is formed. The temperature of the tubular body in the welding step S2 reaches a maximum temperature during welding, then decreases over time, and finally reaches 100 to 500.degree.
  • the inner surface spray coating step S3 is a step of spray coating the coating composition according to the above embodiment on the inner surface of the tubular steel pipe.
  • the steel pipe is preheated in the welding step S2, and the temperature of the steel pipe immediately before the start of spray coating of the coating composition in the inner surface spray coating step S3 is, for example, 100 to 500°C.
  • the coating composition according to the above embodiment can reduce volume expansion when the solvent evaporates, and can reduce the influence of the Leidenfrost phenomenon. Therefore, it is possible to form a cured coating film preferably excellent in corrosion resistance even on the inner surface of the high-temperature steel pipe immediately after the welding step S2.
  • a known coating device having a rotatable nozzle portion can be used as the coating device used for the inner surface spray coating.
  • the drying step S4 is a step of heating and drying the coating composition applied in the inner surface spray coating step S3 to form a cured coating film on the inner surface of the steel pipe.
  • the temperature of the drying step S4 is, for example, 300-500° C., and the drying time is 3-30 seconds.
  • the film thickness of the coating film formed on the inner surface of the steel pipe by the drying step S4 is in the range of 5 to 15 ⁇ m, and the content of zinc in the coating film is 6.5 to 15 g/m 2 in terms of zinc element. be.
  • the outer surface hot-dip galvanizing step S5 is a step of coating the outer surface of the steel pipe that has undergone the drying step S4 with hot-dip galvanizing. Further, when the coating film is not completely cured in the drying step S4, the coating film is heated in the external hot-dip galvanizing step S5 to complete the curing of the coating film and form a cured coating film. .
  • the sizing step S6 is a step of cold rolling the steel pipe that has undergone the outer surface hot-dip galvanizing step S5 in order to make the outer shape into standard dimensions.
  • the cutting step S7 is a step of cutting the steel pipe that has undergone the sizing step S6 into a predetermined length with a cutting device.
  • the steel pipe manufacturing process described above is an example, and the steel pipe manufacturing process to which the steel pipe coating method according to the present embodiment can be applied includes other known processes applied to the steel pipe manufacturing process in addition to the above.
  • the step (1) of heating the steel pipe in advance is not limited to the welding step S2.
  • the step (1) may be any step as long as the temperature of the steel pipe finally reaches 100 to 500°C.
  • the temperature of the steel pipe immediately before the start of spray coating of the above coating composition in the inner surface spray coating step S3 may be finally brought to 100 to 500° C. by an optional heating step.
  • Example 1 [Preparation of coating composition] (Example 1) The components shown below were used as the respective components contained in the coating composition. A coating composition of Example 1 was prepared by mixing each component. Table 1 shows the content of each component. The numerical value of the content of each component in Table 1 means parts by mass.
  • Examples 2 to 16, Comparative Examples 1 to 13 Coating compositions of the above Examples and Comparative Examples were prepared in the same manner as in Example 1, except that the blending amounts of the respective components were as shown in Tables 1 and 2.
  • Tables 1 and 2 show the thickness of the steel pipe and the temperature of the steel pipe immediately before the start of spray coating. Thereafter, drying was performed at a drying temperature of 400 to 450° C. for 5 to 15 seconds to produce steel pipes according to Examples and Comparative Examples.
  • the amount of zinc in the cured coating film (g/m 2 ) in Tables 1 and 2 is the content of zinc in terms of zinc atoms in the cured coating film (measured by fluorescent X-ray analysis), which is the mass per unit area. , in g/m 2 .
  • Coating workability evaluation Coating workability was evaluated when the coating compositions according to Examples and Comparative Examples were spray-coated. It was evaluated based on the following criteria. Evaluation 2 was set as the pass. The results are shown in Tables 1 and 2. 2: Good coating workability 1: Poor coating workability due to spray clogging
  • Repellency evaluation was performed using the coating composition of each example and comparative example.
  • the coating composition of each example and comparative example was applied to a cold-rolled steel sheet heated to 350°C by an airless spray so that the zinc content in the coating was 8 g/m 2 in terms of zinc atoms, and repellency (Leiden The presence or absence of a state in which droplets of the applied metal-based coating agent touched the substrate surface only intermittently due to the frost phenomenon and did not adhere to the substrate surface was visually observed. Evaluation was performed according to the following criteria, and 2 was regarded as a pass. The results are shown in Tables 1 and 2. 2: Repelling of the paint is not visually observed 1: Repelling of the paint is visually observed
  • the coating composition according to each example is more preferable than the coating composition according to the comparative example even when the steel pipe to be coated is at a high temperature. It was confirmed that the steel pipe can be provided with good corrosion resistance and good corrosion resistance. Further, from the results in Table 1, the coating compositions of Examples 1 to 15, which do not substantially contain resin, do not cause repelling as compared with the coating composition of Example 16, which substantially contains resin. , and the result of being able to suppress scorching of the cured coating film during coating was confirmed.

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  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Wood Science & Technology (AREA)
  • Materials Engineering (AREA)
  • Organic Chemistry (AREA)
  • Inorganic Chemistry (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Mechanical Engineering (AREA)
  • Metallurgy (AREA)
  • Paints Or Removers (AREA)

Abstract

L'invention concerne un tuyau en acier qui permet d'obtenir une résistance appropriée à la corrosion même lorsque la température d'un matériau de base est élevée au moment du revêtement du tuyau en acier et d'obtenir une aptitude appropriée du revêtement à la mise en œuvre.　Le tuyau en acier possède sur sa surface intérieure un film de revêtement durci, formé à partir d'une composition de revêtement. La composition de revêtement comprend des particules de zinc (A), des particules d'aluminium (B), des particules d'un composé de l'aluminium (C), un agent de couplage de type silane contenant un groupe époxy (D), des particules de silice (E), du dipropylèneglycol (F) et de l'eau (G). (A) + (B) + (C) = 20 à 40 % en masse, (D)/((A) + (B) + (C)) = 20 à 50 % en masse, (E) = 0,3 à 1,0 % en masse, et (F)/((F) + (G)) = 20 à 50 % en masse. La quantité de zinc dans le film de revêtement durci est de 6,5 à 15 g/m2, exprimée en zinc élémentaire. L'épaisseur du tuyau en acier est de 0,5 à 5 mm.
PCT/JP2022/028798 2021-08-04 2022-07-26 Tuyau en acier et procédé de revêtement d'un tuyau en acier WO2023013482A1 (fr)

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Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5429340A (en) * 1977-08-08 1979-03-05 Sekisui Chem Co Ltd Preparation of coated article having excellent heat resistance and hot-water resistance
JPS57172966A (en) * 1980-07-07 1982-10-25 Toyo Kohan Co Ltd Composite resin composition for metal coating
JP2004331939A (ja) * 2003-04-15 2004-11-25 Nippon Steel Corp ガス輸送鋼管用防食塗料組成物及びガス輸送鋼管
JP2007534794A (ja) * 2004-02-11 2007-11-29 ダクラール 有機チタン化物及び／又は有機ジルコン化物を含有する水性分散液の形態である防錆塗料組成物
JP2012036279A (ja) * 2010-08-05 2012-02-23 Higa Miyoko 防錆塗料、物品、ナット、及び連結具
JP2013023544A (ja) * 2011-07-19 2013-02-04 Tsubakimoto Chain Co 防錆塗料、塗膜形成方法、及び塗装物品
JP2014205909A (ja) * 2013-03-19 2014-10-30 株式会社シールドテクス 防錆剤組成物

Patent Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5429340A (en) * 1977-08-08 1979-03-05 Sekisui Chem Co Ltd Preparation of coated article having excellent heat resistance and hot-water resistance
JPS57172966A (en) * 1980-07-07 1982-10-25 Toyo Kohan Co Ltd Composite resin composition for metal coating
JP2004331939A (ja) * 2003-04-15 2004-11-25 Nippon Steel Corp ガス輸送鋼管用防食塗料組成物及びガス輸送鋼管
JP2007534794A (ja) * 2004-02-11 2007-11-29 ダクラール 有機チタン化物及び／又は有機ジルコン化物を含有する水性分散液の形態である防錆塗料組成物
JP2012036279A (ja) * 2010-08-05 2012-02-23 Higa Miyoko 防錆塗料、物品、ナット、及び連結具
JP2013023544A (ja) * 2011-07-19 2013-02-04 Tsubakimoto Chain Co 防錆塗料、塗膜形成方法、及び塗装物品
JP2014205909A (ja) * 2013-03-19 2014-10-30 株式会社シールドテクス 防錆剤組成物

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