WO2023238611A1 - 被覆鋼板およびその製造方法 - Google Patents

被覆鋼板およびその製造方法 Download PDF

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Publication number
WO2023238611A1
WO2023238611A1 PCT/JP2023/018185 JP2023018185W WO2023238611A1 WO 2023238611 A1 WO2023238611 A1 WO 2023238611A1 JP 2023018185 W JP2023018185 W JP 2023018185W WO 2023238611 A1 WO2023238611 A1 WO 2023238611A1
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Prior art keywords
wax
steel sheet
coated steel
film
less
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.)
Ceased
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PCT/JP2023/018185
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English (en)
French (fr)
Japanese (ja)
Inventor
朋弘 青山
駿 鯉渕
真一 古谷
武士 松田
崇史 河野
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JFE Steel Corp
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JFE Steel Corp
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Filing date
Publication date
Application filed by JFE Steel Corp filed Critical JFE Steel Corp
Priority to KR1020247038150A priority Critical patent/KR20250005313A/ko
Priority to EP23819595.2A priority patent/EP4509309A4/en
Priority to CN202380036501.2A priority patent/CN119156280A/zh
Priority to JP2023552586A priority patent/JP7632672B2/ja
Priority to US18/862,172 priority patent/US20250297124A1/en
Publication of WO2023238611A1 publication Critical patent/WO2023238611A1/ja
Priority to MX2024015189A priority patent/MX2024015189A/es
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

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    • 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
    • C09D135/00—Coating compositions based on homopolymers or copolymers of compounds having one or more unsaturated aliphatic radicals, each having only one carbon-to-carbon double bond, and at least one being terminated by a carboxyl radical, and containing at least another carboxyl radical in the molecule, or of salts, anhydrides, esters, amides, imides or nitriles thereof; Coating compositions based on derivatives of such polymers
    • C09D135/06—Copolymers with vinyl aromatic monomers
    • 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
    • C09D125/00—Coating compositions based on homopolymers or copolymers of compounds having one or more unsaturated aliphatic radicals, each having only one carbon-to-carbon double bond, and at least one being terminated by an aromatic carbocyclic ring; Coating compositions based on derivatives of such polymers
    • C09D125/02—Homopolymers or copolymers of hydrocarbons
    • C09D125/04—Homopolymers or copolymers of styrene
    • C09D125/08—Copolymers of styrene
    • 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
    • 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
    • C09D123/00—Coating compositions based on homopolymers or copolymers of unsaturated aliphatic hydrocarbons having only one carbon-to-carbon double bond; Coating compositions based on derivatives of such polymers
    • C09D123/02—Coating compositions based on homopolymers or copolymers of unsaturated aliphatic hydrocarbons having only one carbon-to-carbon double bond; Coating compositions based on derivatives of such polymers not modified by chemical after-treatment
    • C09D123/04—Homopolymers or copolymers of ethene
    • C09D123/06—Polyethylene
    • 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
    • C09D125/00—Coating compositions based on homopolymers or copolymers of compounds having one or more unsaturated aliphatic radicals, each having only one carbon-to-carbon double bond, and at least one being terminated by an aromatic carbocyclic ring; Coating compositions based on derivatives of such polymers
    • C09D125/02—Homopolymers or copolymers of hydrocarbons
    • C09D125/04—Homopolymers or copolymers of styrene
    • C09D125/08—Copolymers of styrene
    • C09D125/14—Copolymers of styrene with unsaturated esters
    • 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
    • C09D191/00—Coating compositions based on oils, fats or waxes; Coating compositions based on derivatives thereof
    • C09D191/06—Waxes
    • 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
    • C09D5/008—Temporary coatings
    • 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
    • C—CHEMISTRY; METALLURGY
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    • 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
    • C09D7/00—Features of coating compositions, not provided for in group C09D5/00; Processes for incorporating ingredients in coating compositions
    • C09D7/40—Additives
    • C09D7/45—Anti-settling agents
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    • 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
    • C09D7/00—Features of coating compositions, not provided for in group C09D5/00; Processes for incorporating ingredients in coating compositions
    • C09D7/40—Additives
    • C09D7/60—Additives non-macromolecular
    • C09D7/61—Additives non-macromolecular inorganic
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    • 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
    • C09D7/00—Features of coating compositions, not provided for in group C09D5/00; Processes for incorporating ingredients in coating compositions
    • C09D7/40—Additives
    • C09D7/65—Additives macromolecular
    • C—CHEMISTRY; METALLURGY
    • C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
    • C10M—LUBRICATING COMPOSITIONS; USE OF CHEMICAL SUBSTANCES EITHER ALONE OR AS LUBRICATING INGREDIENTS IN A LUBRICATING COMPOSITION
    • C10M169/00—Lubricating compositions characterised by containing as components a mixture of at least two types of ingredient selected from base-materials, thickeners or additives, covered by the preceding groups, each of these compounds being essential
    • C10M169/04—Mixtures of base-materials and additives
    • C10M169/044—Mixtures of base-materials and additives the additives being a mixture of non-macromolecular and macromolecular compounds
    • 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
    • B05D2501/00—Varnish or unspecified clear coat
    • B05D2501/10—Wax
    • C—CHEMISTRY; METALLURGY
    • C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
    • C10M—LUBRICATING COMPOSITIONS; USE OF CHEMICAL SUBSTANCES EITHER ALONE OR AS LUBRICATING INGREDIENTS IN A LUBRICATING COMPOSITION
    • C10M2201/00—Inorganic compounds or elements as ingredients in lubricant compositions
    • C10M2201/06—Metal compounds
    • C10M2201/062—Oxides; Hydroxides; Carbonates or bicarbonates
    • C—CHEMISTRY; METALLURGY
    • C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
    • C10M—LUBRICATING COMPOSITIONS; USE OF CHEMICAL SUBSTANCES EITHER ALONE OR AS LUBRICATING INGREDIENTS IN A LUBRICATING COMPOSITION
    • C10M2201/00—Inorganic compounds or elements as ingredients in lubricant compositions
    • C10M2201/085—Phosphorus oxides, acids or salts
    • C—CHEMISTRY; METALLURGY
    • C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
    • C10M—LUBRICATING COMPOSITIONS; USE OF CHEMICAL SUBSTANCES EITHER ALONE OR AS LUBRICATING INGREDIENTS IN A LUBRICATING COMPOSITION
    • C10M2201/00—Inorganic compounds or elements as ingredients in lubricant compositions
    • C10M2201/10—Compounds containing silicon
    • C10M2201/105—Silica
    • C—CHEMISTRY; METALLURGY
    • C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
    • C10M—LUBRICATING COMPOSITIONS; USE OF CHEMICAL SUBSTANCES EITHER ALONE OR AS LUBRICATING INGREDIENTS IN A LUBRICATING COMPOSITION
    • C10M2205/00—Organic macromolecular hydrocarbon compounds or fractions, whether or not modified by oxidation as ingredients in lubricant compositions
    • C10M2205/04—Organic macromolecular hydrocarbon compounds or fractions, whether or not modified by oxidation as ingredients in lubricant compositions containing aromatic monomers, e.g. styrene
    • C—CHEMISTRY; METALLURGY
    • C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
    • C10M—LUBRICATING COMPOSITIONS; USE OF CHEMICAL SUBSTANCES EITHER ALONE OR AS LUBRICATING INGREDIENTS IN A LUBRICATING COMPOSITION
    • C10M2205/00—Organic macromolecular hydrocarbon compounds or fractions, whether or not modified by oxidation as ingredients in lubricant compositions
    • C10M2205/14—Synthetic waxes, e.g. polythene waxes
    • C—CHEMISTRY; METALLURGY
    • C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
    • C10M—LUBRICATING COMPOSITIONS; USE OF CHEMICAL SUBSTANCES EITHER ALONE OR AS LUBRICATING INGREDIENTS IN A LUBRICATING COMPOSITION
    • C10M2209/00—Organic macromolecular compounds containing oxygen as ingredients in lubricant compositions
    • C10M2209/02—Macromolecular compounds obtained by reactions only involving carbon-to-carbon unsaturated bonds
    • C10M2209/08—Macromolecular compounds obtained by reactions only involving carbon-to-carbon unsaturated bonds containing monomers having an unsaturated radical bound to a carboxyl radical, e.g. acrylate type
    • C—CHEMISTRY; METALLURGY
    • C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
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    • C10M2209/00—Organic macromolecular compounds containing oxygen as ingredients in lubricant compositions
    • C10M2209/10—Macromolecular compoundss obtained otherwise than by reactions only involving carbon-to-carbon unsaturated bonds
    • C10M2209/101—Condensation polymers of aldehydes or ketones and phenols, e.g. Also polyoxyalkylene ether derivatives thereof
    • C—CHEMISTRY; METALLURGY
    • C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
    • C10M—LUBRICATING COMPOSITIONS; USE OF CHEMICAL SUBSTANCES EITHER ALONE OR AS LUBRICATING INGREDIENTS IN A LUBRICATING COMPOSITION
    • C10M2209/00—Organic macromolecular compounds containing oxygen as ingredients in lubricant compositions
    • C10M2209/10—Macromolecular compoundss obtained otherwise than by reactions only involving carbon-to-carbon unsaturated bonds
    • C10M2209/102—Polyesters
    • C—CHEMISTRY; METALLURGY
    • C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
    • C10M—LUBRICATING COMPOSITIONS; USE OF CHEMICAL SUBSTANCES EITHER ALONE OR AS LUBRICATING INGREDIENTS IN A LUBRICATING COMPOSITION
    • C10M2221/00—Organic macromolecular compounds containing sulfur, selenium or tellurium as ingredients in lubricant compositions
    • C—CHEMISTRY; METALLURGY
    • C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
    • C10N—INDEXING SCHEME ASSOCIATED WITH SUBCLASS C10M RELATING TO LUBRICATING COMPOSITIONS
    • C10N2020/00—Specified physical or chemical properties or characteristics, i.e. function, of component of lubricating compositions
    • C10N2020/01—Physico-chemical properties
    • C10N2020/04—Molecular weight; Molecular weight distribution
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    • C10N2020/00—Specified physical or chemical properties or characteristics, i.e. function, of component of lubricating compositions
    • C10N2020/01—Physico-chemical properties
    • C10N2020/055—Particles related characteristics
    • C10N2020/06—Particles of special shape or size
    • C—CHEMISTRY; METALLURGY
    • C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
    • C10N—INDEXING SCHEME ASSOCIATED WITH SUBCLASS C10M RELATING TO LUBRICATING COMPOSITIONS
    • C10N2030/00—Specified physical or chemical properties which is improved by the additive characterising the lubricating composition, e.g. multifunctional additives
    • C10N2030/06—Oiliness; Film-strength; Anti-wear; Resistance to extreme pressure
    • C—CHEMISTRY; METALLURGY
    • C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
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    • C10N2030/00—Specified physical or chemical properties which is improved by the additive characterising the lubricating composition, e.g. multifunctional additives
    • C10N2030/12—Inhibition of corrosion, e.g. anti-rust agents or anti-corrosives
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    • C10N2040/00—Specified use or application for which the lubricating composition is intended
    • C10N2040/20—Metal working
    • C10N2040/24—Metal working without essential removal of material, e.g. forming, gorging, drawing, pressing, stamping, rolling or extruding; Punching metal
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    • C10N2040/244—Metal working of specific metals
    • C10N2040/246—Iron or steel
    • C—CHEMISTRY; METALLURGY
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    • C10N2050/00—Form in which the lubricant is applied to the material being lubricated
    • C10N2050/015—Dispersions of solid lubricants
    • C10N2050/02—Dispersions of solid lubricants dissolved or suspended in a carrier which subsequently evaporates to leave a lubricant coating
    • C—CHEMISTRY; METALLURGY
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    • C10N2050/00—Form in which the lubricant is applied to the material being lubricated
    • C10N2050/023—Multi-layer lubricant coatings

Definitions

  • the present invention relates to a coated steel sheet, and particularly to a coated steel sheet with excellent press formability.
  • the present invention also relates to a method for manufacturing the coated steel sheet.
  • Steel plates such as cold-rolled steel plates and hot-rolled steel plates are widely used in various fields. For example, in applications such as automobile bodies, it is common to press-form steel plates and use them. Therefore, steel sheets are required to have excellent press formability.
  • the steel plate when press forming a steel plate into a complicated shape, the steel plate may not be able to withstand the forming and break, or die galling may occur during continuous press forming. As a result, it has a serious negative impact on the productivity of products such as automobiles. Therefore, there is a need to further improve press formability.
  • Examples of methods for improving press moldability include a method of subjecting a mold used for press molding to surface treatment. Although this is a widely used method, there is a problem in that once the surface treatment is applied, the mold cannot be adjusted thereafter. Another problem is that the cost is high.
  • Patent Document 1 proposes a coated steel sheet in which an acrylic resin film is formed on the surface of a zinc-based plated steel sheet.
  • Patent Document 2 proposes that in a coated metal plate in which a resin film is formed on the surface of the metal plate, a solid lubricant is made to protrude by 0.01 to 1.5 ⁇ m from the resin film surface.
  • Patent Document 3 proposes coating the surface of a metal product with a film of 0.5 to 5 ⁇ m made of polyurethane resin containing a lubricant.
  • Patent Document 4 proposes a coated steel sheet having an alkali-soluble organic coating in which a lubricant is added to an epoxy resin.
  • the present invention has been made in view of the above circumstances, and an object of the present invention is to provide a coated steel sheet having excellent press formability.
  • the present inventors focused on a coated steel sheet having a film containing an organic resin and wax, and as a result of intensive research to solve the above problems, the following findings were obtained.
  • the present invention has been made based on the above findings, and the gist thereof is as follows.
  • a coated steel plate comprising a base steel plate and a film containing an organic resin and wax provided on at least one surface of the base steel plate,
  • the organic resin is at least one selected from the group consisting of styrene resin, epoxy resin, phenol resin, and polyester resin
  • the wax is a polyolefin wax having a melting point of 100° C. or more and 145° C.
  • an area ratio of a wax-deficient portion defined as a region where the ratio of the mass of the wax to the mass of the organic resin is 1/10 or less to the entire film is 20.0% or less, The average area of the wax-deficient portion is 50.0 ⁇ m 2 or less, A coated steel sheet, wherein the amount of the coating coated on one side is 0.3 g/m 2 or more.
  • the proportion of the organic resin in the film is 30% by mass or more and 95% by mass or less,
  • the coated steel sheet according to 1 above, wherein the proportion of the wax in the coating is 5% by mass or more and 50% by mass or less.
  • rust preventive is at least one selected from the group consisting of aluminum salts of phosphoric acids, zinc salts, and zinc oxide.
  • dispersant is at least one selected from the group consisting of sodium polycarboxylate, sodium polyacrylate, carboxylic acid copolymer, and sulfonic acid copolymer.
  • the coefficient of friction between the steel plate and the mold can be significantly reduced.
  • it is possible to suppress mold galling in areas with high surface pressure. Therefore, the coated steel sheet of the present invention has extremely good press formability and can be suitably used for forming into complicated shapes.
  • FIG. 1 is a diagram showing the distribution of wax-deficient areas obtained by analyzing the map image of FIG. 1.
  • FIG. 3 is a diagram showing the distribution of wax-deficient areas obtained by analyzing the map image of FIG. 2.
  • FIG. 6 is a schematic front view showing a friction coefficient measuring device. 6 is a schematic perspective view showing the bead shape and dimensions in FIG. 5.
  • Coated steel plate in one embodiment of the present invention includes a base steel plate and a coating provided on at least one surface of the base steel plate.
  • the film contains an organic resin and wax. Each component will be explained below.
  • the organic resin plays a role as a binder that holds the wax on the surface of the steel plate. Since inorganic binders have low affinity with polyolefins, they cannot provide the effect of imparting sliding properties by forming a lubricating film. Therefore, it is important that the film contains an organic resin.
  • organic resin at least one selected from the group consisting of styrene resin, epoxy resin, phenol resin, and polyester resin is used.
  • organic resin a mixture of two or more resins may be used.
  • the styrene resin is not particularly limited, and any styrene resin can be used.
  • the styrene resin is a polymer containing a styrene monomer as a constituent component, and typically refers to a styrene homopolymer and a styrene-containing copolymer.
  • the copolymer include copolymers of styrene and at least one selected from the group consisting of acrylic monomers, nitrile groups, ethylene, and butadiene.
  • the styrene resin is preferably a styrene acrylic resin.
  • the epoxy resin is not particularly limited, and any epoxy resin can be used.
  • examples of the epoxy resin include bisphenol A epoxy resin, bisphenol F epoxy resin, and novolak epoxy resin.
  • the phenolic resin is not particularly limited, and any phenolic resin can be used.
  • the phenolic resin it is preferable to use a resol-based phenolic resin that can be dissolved or dispersed in an aqueous solvent.
  • polyester resin any polyester resin can be used without particular limitation.
  • polyester resin it is preferable to use a polyester resin containing a monomer having a carboxy group as a constituent component.
  • the organic resin is an alkali-soluble resin. That is, when a steel plate is used for an automobile body or the like, it is press-formed and then painted. At that time, if the organic resin is an alkali-soluble resin, the film can be removed (defilmed) in an alkali degreasing step performed before painting. Therefore, subsequent painting can be performed satisfactorily.
  • the above film can contain an organic resin in any proportion.
  • the proportion of the organic resin is 30% or more.
  • the proportion of the organic resin in the film is more preferably 40% or more, and even more preferably 50% or more.
  • the upper limit of the proportion of the organic resin is not particularly limited, but in order to add a certain amount of wax as described later, it is preferably 95% or less, more preferably 90% or less.
  • the proportion of the organic resin in the film is defined as the ratio of the mass of the solid content of the organic resin in the film to the total mass of all the solid content in the film.
  • the mass average molecular weight of the organic resin is not particularly limited. However, if the weight average molecular weight is less than 5,000, the rust prevention property may be poor. Therefore, from the viewpoint of rust prevention, the mass average molecular weight of the organic resin is preferably 5,000 or more, more preferably 7,000 or more, and even more preferably 9,000 or more. On the other hand, if the weight average molecular weight of the organic resin exceeds 30,000, adhesiveness may deteriorate. Therefore, from the viewpoint of adhesiveness, the weight average molecular weight of the organic resin is preferably 30,000 or less, more preferably 25,000 or less, and even more preferably 20,000 or less.
  • the mass average molecular weight of the organic resin is the mass average molecular weight measured based on JIS K 7252 "Plastics - How to determine the average molecular weight and molecular weight distribution of polymers by size exclusion chromatography".
  • wax polyolefin wax
  • Polyolefin waxes have low surface energy and self-lubricating properties. Therefore, excellent press formability can be obtained by providing a film containing polyolefin wax on the surface of the base steel sheet. Furthermore, by controlling the density and molecular weight of the polyolefin, the melting point can be relatively easily adjusted within the range described below.
  • polyolefin waxes it is preferable to use polyethylene wax because it provides the best lubricating effect.
  • the melting point of the polyolefin wax is 100°C or more and 145°C or less.
  • polyolefin wax itself has self-lubricating properties.
  • the melting point of the polyolefin wax is within the above range, the polyolefin wax will become semi-molten due to frictional heat from sliding with the mold during press molding, and a lubricating film made of a mixture of organic resin and wax will form on the mold surface. and coat the sliding surface of the steel plate. As a result, direct contact between the mold and the steel plate is suppressed, so press formability is significantly improved.
  • the melting point of the polyolefin wax is 100°C or higher, preferably 120°C or higher.
  • the melting point of the polyolefin wax is higher than 145° C., the polyolefin wax will not melt due to the frictional heat during press molding, so that not only a sufficient lubricating effect will not be obtained, but also a mold coating effect will not be obtained. Therefore, the melting point of the polyolefin wax is 145°C or lower, preferably 140°C or lower.
  • the melting point of the polyolefin wax is defined as the melting temperature measured based on JIS K 7121 "Method for measuring transition temperature of plastics”.
  • the average particle size of the polyolefin wax is 3.0 ⁇ m or less, preferably 1.5 ⁇ m or less, more preferably 0.5 ⁇ m or less, even more preferably 0.3 ⁇ m or less.
  • the lower limit of the average particle size of the polyolefin wax is not particularly limited, but if it is too small, the polyolefin wax may dissolve in lubricating oil during press molding, and the lubricity improving effect may decrease. Furthermore, since the polyolefin wax tends to aggregate in the paint, not only the stability of the paint becomes low, but also coarse wax-deficient areas are likely to be formed. Therefore, the average particle size of the polyolefin wax is preferably 0.01 ⁇ m or more, more preferably 0.03 ⁇ m or more.
  • the average particle size can be measured by observing wax particles on the surface of the film using a scanning electron microscope (SEM). That is, it is determined by acquiring a SEM image set at a magnification that corresponds to the particle size of the wax and analyzing the image.
  • SEM scanning electron microscope
  • the average particle diameter of wax particles using SEM When measuring the average particle size of wax particles using SEM, it is necessary to set the accelerating voltage sufficiently low in order to suppress the spread and transmission of the electron beam and to obtain information about the wax particles near the film surface. . For this purpose, it is preferable to measure at an accelerating voltage of 1 kV or less. Furthermore, in order to prevent image disturbance due to charging during observation and to clearly identify wax particles, it is preferable to coat with a conductive substance such as C, Au, or Os. The thickness of the coating made of the conductive material is preferably 2 nm or less. The measurement range of the SEM image must be such that wax particles can be identified and a statistically significant number of wax particles are included.
  • the pixel size is 30 nm or less and the measurement range is 10 ⁇ m ⁇ 10 ⁇ m or more.
  • the SEM image may be obtained by measuring continuous or arbitrary plural fields of view, and a plurality of SEM images may be obtained so that the above measurement range is satisfied in total.
  • the above film can contain wax in any proportion.
  • the proportion of wax in the film is too high, the proportion of organic resin as a binder will be relatively reduced, and the wax component will easily fall off. Moreover, adhesiveness is reduced.
  • the coating may not be sufficiently removed from the surface of the steel plate during the alkaline degreasing step, and as a result, sufficient degreasing performance may not be obtained, resulting in deterioration of paintability. Therefore, the proportion of wax in the film is preferably 50% or less, more preferably 30% or less.
  • the proportion of wax in the film is preferably 5% or more, more preferably 10% or more.
  • the proportion of wax in the film is defined as the ratio of the mass of the solid content of wax in the film to the total mass of all solid content in the film.
  • (wax deficient area) Area ratio of wax-deficient portion: 20.0% or less
  • the wax tends to aggregate in the film and be unevenly distributed.
  • a region (wax-deficient region) in which the proportion of wax is extremely low is formed in the film.
  • the area ratio of the wax-deficient portion to the entire film is set to 20.0% or less, preferably 15.0% or less, and more preferably 10.0% or less.
  • the lower the area ratio is, the better the press formability is, so the lower limit is not particularly limited and may be 0%.
  • the actual distribution of wax on the film surface is not necessarily the same.
  • the average area of the wax-deficient portion is set to 50.0 ⁇ m 2 or less, preferably 20.0 ⁇ m 2 or less, and more preferably 10.0 ⁇ m 2 or less.
  • the lower limit is not particularly limited.
  • the average area of the wax-deficient portion may be 2.0 ⁇ m 2 or more, or 5.0 ⁇ m 2 or more.
  • the wax-deficient portion is defined as a region in the film where the ratio of the mass of wax to the mass of organic resin is 1/10 or less.
  • the ratio of the mass of wax to the mass of organic resin is higher than 1/10.
  • the average area and area ratio of the wax-deficient portion can be measured using microspectrophotometry, which can measure peaks belonging to each of the wax component and the organic resin component.
  • the spectroscopic method include microscopic Raman spectroscopy and microscopic FT-IR method.
  • a specific method for determining the average area and area ratio of the wax-deficient portion by spectroscopy will be described.
  • a map image of peak intensities corresponding to each of the wax component and the organic resin component is obtained using spectroscopy.
  • a map image of the peak intensity ratio of the wax component to the organic resin component is obtained.
  • the map image of the peak intensity ratio is converted into a map image of the mass ratio of the wax component to the organic resin component. Conversion from this intensity ratio to a mass ratio can be performed using a calibration curve.
  • the calibration curve is created in advance by measuring a peak intensity ratio map using a plurality of standard samples each having a film in which the mass ratio of the wax component to the organic resin component is known.
  • a region where the mass ratio of wax to organic resin is 1/10 or less is extracted as a wax-deficient region, and the area of each independent wax-deficient region is calculated using image analysis software.
  • the average area of the calculated individual wax-deficient parts is calculated and used as the average area of the wax-deficient parts.
  • the ratio of the total area of each independent wax-deficient part to the area of the measured visual field is calculated and used as the area ratio of the wax-deficient part.
  • the peaks to be measured when calculating the area ratio and average area of the wax-depleted area may be those that belong to the wax component and the organic resin component independently, but in order to reduce noise, peaks with the highest possible intensity should be used. It is preferable to use For example, in micro-Raman spectroscopy, it is preferable to use a peak at 1295 cm ⁇ 1 corresponding to the twist of CH 2 as the peak attributed to polyolefin wax. Furthermore, it is preferable to use a peak at 1000 cm ⁇ 1 corresponding to the stretching vibration of an aromatic ring chain as a peak attributed to the organic resin component, such as styrene resin, epoxy resin, phenol resin, or polyester resin.
  • the measurement range of the map image of the peak intensity ratio needs to include a statistically significant number of wax-deficient areas, so it is preferably 80 ⁇ m x 80 ⁇ m or more. Note that the measurement range may be one continuous visual field or a combination of multiple visual fields.
  • the upper limit of the average particle size of the wax in the present invention is 3.0 ⁇ m. Therefore, from the viewpoint of determining the state of wax aggregation, the interval between each measurement point of the map image is preferably 3 ⁇ m or less, more preferably 2 ⁇ m or less.
  • FIGS. 1 and 2 are examples of map images of the peak intensity ratio of the wax component to the organic resin component obtained by micro-Raman spectroscopy.
  • the measurement range was 100 ⁇ m ⁇ 100 ⁇ m, and the measurement conditions were as described above.
  • Figure 1 is a map image of the peak intensity ratio of a film in which wax is distributed relatively uniformly
  • Figure 2 is a map image of the peak intensity ratio of a film in which wax is distributed unevenly (a film in which wax aggregates). It is a map image.
  • FIGS. 3 and 4 are diagrams showing the distribution of wax-deficient areas obtained by analyzing the map images of peak intensity ratios shown in FIGS. 1 and 2, respectively.
  • the peak intensity ratio map images shown in FIGS. 1 and 2 were converted into a mass ratio map image using a calibration curve prepared in advance.
  • wax-deficient areas in the mass ratio map image were displayed as white areas.
  • the area ratio and average area of the wax-deficient portion were 0.3% and 6.3 ⁇ m 2 in FIG. 3, and 33.6% and 112.1 ⁇ m 2 in FIG. 4, respectively.
  • the above film does not rust under normal storage conditions even when it does not contain a rust preventive agent. However, from the viewpoint of further improving rust prevention properties, it is preferable that the film further contains a rust preventive agent.
  • any rust preventive agent can be used without particular limitation, but at least one selected from the group consisting of aluminum salts of phosphoric acids, zinc salts, and zinc oxide may be used.
  • the phosphoric acids include orthophosphoric acid as well as condensed phosphoric acids such as pyrophosphoric acid, tripolyphosphoric acid, tetrapolyphosphoric acid, and metaphosphoric acid.
  • the content of the rust preventive agent is not particularly limited, but if the content of the rust preventive agent is too low, sufficient effects may not be obtained.
  • the proportion of the rust preventive agent in the film is 5% or more.
  • the proportion of the rust preventive in the film exceeds 30%, the adhesion may deteriorate.
  • the rust preventive agent may precipitate in the paint state, resulting in deterioration of paint stability. Therefore, it is preferable that the proportion of the rust preventive agent in the film is 30% or less.
  • the ratio of the rust inhibitor in the film is defined as the ratio of the mass of the rust inhibitor in the film to the total mass of all solids in the film.
  • the film further contains a dispersant.
  • a dispersant any dispersant can be used without particular limitation, but it is preferable to use an anionic polymer type dispersant.
  • Anionic polymer type dispersants are particularly effective in improving the dispersibility of particles of several ⁇ m or less, and can also be adsorbed onto polyolefin waxes.
  • the anionic polymer type dispersant it is preferable to use at least one selected from the group consisting of sodium polycarboxylate, sodium polyacrylate, carboxylic acid copolymer, and sulfonic acid copolymer.
  • the proportion of the dispersant in the film is not particularly limited, it is preferably 0.5% or more.
  • the proportion of the dispersant in the film is 0.5% or more, the dispersibility of wax in the paint improves, and the uniformity of wax distribution in the resulting film improves. As a result, it becomes easier to achieve a desired wax distribution, and press moldability is further improved.
  • the proportion of the dispersant in the film exceeds 5%, the adhesion may deteriorate. Therefore, the proportion of the dispersant in the film is preferably 5% or less.
  • the ratio of the dispersant in the film is the ratio of the mass of the dispersant in the film to the total mass of solid content of all components in the film.
  • the film further contains silica. Moreover, since precipitation of the rust preventive agent contained in the paint is suppressed by containing silica, the stability of the paint is improved.
  • the silica is not particularly limited and any silica can be used.
  • the silica it is preferable to use colloidal silica.
  • the average particle diameter of the colloidal silica is not particularly limited, it is preferably 5 nm or more. Moreover, it is preferable that the average particle diameter of the colloidal silica is 200 nm or less.
  • the average particle diameter of the colloidal silica can be measured by a dynamic light scattering method. Specifically, first, the particle size distribution based on scattering intensity is measured by dynamic light scattering. Next, the particle size distribution is converted from a scattering intensity basis to a volume basis. The median diameter D50 in the obtained volume-based particle diameter distribution is defined as the average particle diameter of colloidal silica.
  • the proportion of silica in the film is preferably 1% or more.
  • the proportion of silica in the film is preferably 10% or less.
  • the ratio of silica in the film is the ratio of the mass of silica in the film to the total mass of solid content of all components in the film.
  • the proportion of each component contained in the film can be calculated from the solid mass of each film component at the time of preparing the paint.
  • the film may contain other optional components.
  • the other components include surface conditioners and antifoaming agents that are generally added to paints.
  • Adhesion amount 0.3 g/ m2 or more If the adhesion amount of the above film is less than 0.3 g/ m2 , the wax will coagulate between the time the paint is applied to form the film and the time it dries. This tends to occur, making it impossible to obtain the desired wax distribution, resulting in a decrease in press formability. Therefore, the amount of coating per side is set to 0.3 g/m 2 or more. Note that, as described later, the final wax distribution is affected by the surface roughness of the underlying steel plate.
  • the coating amount per side of the coating is 0.4 g/m 2 or more, and 0.6 g/m 2 or more. It is more preferable to set it as m2 or more, and it is still more preferable to set it as 0.8 g/ m2 or more.
  • the upper limit of the amount of the film deposited is not particularly limited, but if it exceeds 2.5 g/m 2 , weldability, film removability, and adhesion may deteriorate. Therefore, it is preferable that the amount of coating per side of the film is 2.5 g/m 2 or less.
  • the amount of film attached can be determined by removing the film from the coated steel sheet and dividing the mass difference before and after removing the film by the area of the steel sheet.
  • the film can be removed by any method that can remove only the film without damaging the underlying steel plate.
  • a solvent such as an organic solvent
  • a stripping agent containing the solvent, or the like may be used.
  • an alkaline degreaser it is preferable to use an alkaline degreaser as described in the Examples.
  • the base steel plate may be either a cold-rolled steel plate or a hot-rolled steel plate.
  • the tensile strength TS of the base steel plate is not particularly limited, but if it is too low, the strength of the press-formed member that is finally obtained may be insufficient. Therefore, the tensile strength of the base steel plate is preferably 260 MPa or more. On the other hand, the upper limit of the tensile strength is not particularly limited either. For example, when a high-strength steel plate having a tensile strength of 440 MPa or more is used as the base steel plate, the surface pressure during press forming becomes high. However, according to the present invention, the coefficient of friction between the steel plate and the mold can be significantly lowered, so even under such high surface pressure conditions, the occurrence of cracks and mold galling can be suppressed.
  • the tensile strength of the base steel plate may be 440 MPa or more. However, if the tensile strength is too high, it becomes difficult to press-form into a complicated shape. Therefore, from the viewpoint of press formability into a complex shape, the tensile strength of the base steel plate is preferably 440 MPa or less.
  • the thickness of the base steel plate is not particularly limited, but if it is too thin, the strength of the press-formed member that is finally obtained may be insufficient. Therefore, the thickness of the base steel plate is preferably 0.5 mm or more. On the other hand, the upper limit of the plate thickness is not particularly limited, but if it is too thick, it becomes difficult to press-form it into a complicated shape. Therefore, the thickness of the base steel plate is preferably 4.0 mm or less.
  • the surface roughness of the base steel sheet (the surface roughness of the base steel sheet before film formation) is not particularly limited.
  • the arithmetic mean roughness Ra of the surface of the base steel plate is larger than 2.5 ⁇ m, the surface of the base steel plate has large irregularities, making it difficult for the film formed in the recesses to come into contact with the mold during press forming.
  • the amount of film deposited on the convex portions is smaller than that on the concave portions, it becomes difficult to obtain the desired wax distribution, and as a result, the effect of improving press formability may be reduced. Therefore, from the viewpoint of further improving press formability, it is preferable that Ra is 2.5 ⁇ m or less.
  • Ra is smaller than 0.4 ⁇ m, minute scratches that may occur during press molding are likely to be noticeable. Moreover, if Ra is smaller than 0.4 ⁇ m, galling may occur during press molding. Therefore, it is preferable that Ra is 0.4 ⁇ m or more.
  • the arithmetic mean roughness Ra of the base steel plate can be measured according to JIS B 0633:2001 (ISO 4288:1996).
  • Ra is determined from a roughness curve measured with a cutoff value and a reference length of 0.8 mm and an evaluation length of 4 mm.
  • Ra is greater than 2 and less than or equal to 10
  • Ra is determined from the roughness curve measured using the cutoff value and the reference length of 2.5 mm and the evaluation length of 12.5 mm.
  • the manufacturing method of the coated steel sheet of the present invention will be explained.
  • the above-mentioned coated steel sheet is manufactured by applying a paint containing an organic resin and wax to at least one surface of a base steel sheet and drying it. Note that the points not particularly mentioned can be the same as the description of the above-mentioned coated steel plate.
  • an organic resin solution in which an organic resin is dissolved in a solvent or an organic resin emulsion in which an organic resin is dispersed in a solvent, to which wax is added can be used.
  • the solvent one or both of water and an organic solvent can be used, but it is preferable to use water.
  • the percentage of total solids in the paint is not particularly limited, but is preferably 1 to 30%. If the total solid content in the paint is less than 1% or more than 30%, uneven coating may occur and the desired wax distribution may not be obtained. Note that the total solid content ratio in the paint is the concentration of the total solid content in the paint, that is, the ratio of the solid content mass to the total mass of the paint (including the solvent).
  • the paint can be applied to the base steel plate by any method without particular limitation.
  • the coating include methods using a roll coater or bar coater, spraying, dipping, and brush coating.
  • the paint is applied so that the coated steel plate finally obtained has an amount of film deposited on one side of the steel plate of 0.3 g/m 2 or more in terms of dry mass.
  • Drying after applying the paint is not particularly limited and can be performed by any method. Examples of the drying method include drying with hot air, drying with an IH heater, and infrared heating.
  • the maximum temperature of the steel plate during drying is preferably 60°C or higher and lower than the melting point of the wax used. If the maximum temperature is less than 60° C., it takes a long time to dry and the rust prevention properties may be poor. On the other hand, when the maximum temperature exceeds the melting point of the wax, the wax melts and coalesces, and the particle size becomes coarse, making it difficult to obtain the desired wax distribution.
  • a coated steel plate was manufactured by forming a film on the surface of the base steel plate according to the following procedure.
  • base steel plates A to C are cold-rolled steel plates with a plate thickness of 0.8 mm
  • base steel plate D is a hot-rolled steel plate with a plate thickness of 2.0 mm.
  • the base steel plates A to D are all SPCD (JIS G 3141) and SPHD (JIS G 3131) having a tensile strength of 270 MPa class.
  • paints having the compositions shown in Tables 2 and 3 were prepared.
  • the ratio of each component in Tables 2 and 3 is the ratio of the mass of solid content of each component to the total mass of all solid content contained in the paint.
  • colloidal silica having a volume average particle diameter of 9 nm was used as the silica.
  • the molecular weight of the organic resin, the melting point and the average particle size of the wax shown in Tables 2 and 3 are values measured by the methods described above.
  • the paint was applied to the surface of the base steel plate using a bar coater, and heated and dried using an IH heater so that the maximum temperature on the surface of the steel plate reached 80°C, to obtain a coated steel plate.
  • the combinations of base steel plates and paints used were as shown in Tables 4 to 7. For comparison, in some comparative examples, no film was formed, and the base steel plates were directly subjected to the evaluation described below.
  • the amount of film deposited on the obtained coated steel sheet was measured. Specifically, the film was removed from the coated steel plate, and the amount of adhesion was determined by dividing the mass difference before and after removing the film by the area of the steel plate. The film was removed by immersing the coated steel plate in a degreasing solution with a degreasing agent concentration of 20 g/L and a temperature of 40° C. for 300 seconds.
  • a degreasing agent an alkaline degreasing agent Fine Cleaner E6403 (manufactured by Nippon Parkerizing Co., Ltd.) was used.
  • Fine Cleaner E6403 manufactured by Nippon Parkerizing Co., Ltd.
  • the film adhesion amounts shown in Tables 4 to 7 are values per one side of the steel plate.
  • a map image of the peak intensity ratio of the wax component to the organic resin component was created by dividing the peak intensity of the wax component in the obtained map image by the peak intensity of the organic resin component. Thereafter, the map image of the peak intensity ratio was converted into a map image of the mass ratio of the wax component to the organic resin component using a calibration curve prepared in advance.
  • Press formability is correlated with sliding property, that is, the friction coefficient of the surface of the steel plate, and the lower the friction coefficient, the better the press formability. Therefore, in order to evaluate the press formability, the friction coefficient of the obtained coated steel plate was measured according to the following procedure.
  • FIG. 5 is a schematic front view showing the friction coefficient measuring device.
  • a sample 1 for friction coefficient measurement taken from a coated steel plate is fixed to a sample stand 2, and the sample stand 2 is fixed to the upper surface of a horizontally movable slide table 3.
  • a vertically movable slide table support 5 having rollers 4 in contact with the lower surface of the slide table 3 is provided, and by pushing this up, the pressing load N applied to the sample 1 for friction coefficient measurement by the beads 6 is reduced.
  • a first load cell 7 for measuring is attached to the slide table support 5.
  • a second load cell 8 is attached to one end of the slide table 3 for measuring the sliding resistance force F for horizontally moving the slide table 3 while the pressing force is applied.
  • the test was conducted by applying Pleton R352L, a press cleaning oil manufactured by Sugimura Chemical Industry Co., Ltd., to the surface of Sample 1 as a lubricating oil.
  • FIG. 6 is a schematic perspective view showing the shape and dimensions of the beads used.
  • the lower surface of the bead 6 slides while being pressed against the surface of the sample 1.
  • the shape of the bead 6 shown in FIG. 6 is 10 mm wide, 59 mm long in the sliding direction of the sample, the lower part of both ends in the sliding direction is a curved surface with a curvature of 4.5 mm, and the lower surface of the bead against which the sample is pressed has a width of 10 mm and a sliding direction. It has a plane with a direction length of 50 mm.
  • the friction coefficient measurement test was conducted using the bead shown in FIG. 6 with a pressing load N of 400 kgf and a sample pull-out speed (horizontal movement speed of the slide table 3) of 20 cm/min.
  • each coated steel plate was first immersed in a degreasing solution with a degreasing agent concentration of 20 g/L and a temperature of 40° C. for a predetermined period of time, and then degreased by washing with tap water.
  • a degreasing agent an alkaline degreasing agent Fine Cleaner E6403 (manufactured by Nippon Parkerizing Co., Ltd.) was used.
  • Film peeling rate (%) [(Surface carbon strength before degreasing - Surface carbon strength after degreasing) / (Surface carbon strength before degreasing - Surface carbon strength of base steel plate)] x 100 Note that the surface carbon strength of the base steel sheet herein refers to the surface carbon strength of the base steel sheet before forming the film.
  • the above test was conducted while changing the immersion time in the degreasing solution, and the immersion time in the alkaline degreasing solution at which the film peeling rate was 98% or more was determined.
  • the obtained immersion time is shown in Tables 4 to 7 as "film removal time".
  • the membrane removal time was 120 seconds or less, it was judged that the membrane removal property was good.
  • rust prevention Assuming that the coated steel plates were stored in a coiled state, the rust prevention properties were evaluated in the stacked state. Specifically, a test piece with a size of 150 mm x 70 mm was taken from a coated steel plate, and rust preventive oil was applied to both sides of the test piece at a coating amount of 1.0 g/m 2 per side. Next, the two test pieces were overlapped and held in an environment with a temperature of 50° C. and a humidity of 95% RH while applying a load with a surface pressure of 0.02 kgf/mm 2 .
  • the stacked inner surfaces were checked every 7 days and the number of days until rust appeared was evaluated.
  • the number of days until rust appeared was 56 days or more, it was evaluated as “excellent”, when it was 21 days or more, it was evaluated as “good”, and when it was less than 21 days, it was evaluated as "fair”.
  • Adhesiveness When a press-formed member obtained by press-forming a coated steel plate is used for an automobile body or the like, adhesion may be performed during the assembly process. Therefore, it is desirable that the coated steel sheet has excellent adhesiveness as well as press formability. Therefore, the adhesion of the coated steel plate was evaluated. Specifically, two test pieces with a size of 100 x 25.4 mm were taken from each coated steel plate and immersed in antirust oil. After the test piece was removed from the rust preventive oil, it was stood vertically for 24 hours to remove excess oil.
  • an epoxy adhesive was applied uniformly to a thickness of 0.2 mm over a 25.4 mm x 13 mm area on the surface of the test piece. Thereafter, the two test pieces were overlapped and sandwiched with clips, and baked at 180° C. for 20 minutes to dry and harden. After cooling, a shear tensile test was performed using an autograph tester to measure the shear adhesive strength. When the shear adhesive strength was 20 MPa or more, it was considered as good adhesiveness.
  • the coated steel sheet of the present invention has excellent sliding properties (press formability) during press forming, and can be suitably used for various uses including automobile body uses.

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WO2017094893A1 (ja) * 2015-12-04 2017-06-08 Ｊｆｅスチール株式会社 ステンレス鋼板用潤滑塗料および潤滑ステンレス鋼板
JP2020002330A (ja) * 2018-07-02 2020-01-09 株式会社栗本鐵工所 金属管用耐食層

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