WO2013065349A1 - レーザ切断性、一次防錆性および視認性に優れた塗装鋼材 - Google Patents

レーザ切断性、一次防錆性および視認性に優れた塗装鋼材 Download PDF

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Publication number
WO2013065349A1
WO2013065349A1 PCT/JP2012/064731 JP2012064731W WO2013065349A1 WO 2013065349 A1 WO2013065349 A1 WO 2013065349A1 JP 2012064731 W JP2012064731 W JP 2012064731W WO 2013065349 A1 WO2013065349 A1 WO 2013065349A1
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Prior art keywords
powder
coating film
less
content
steel material
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PCT/JP2012/064731
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English (en)
French (fr)
Japanese (ja)
Inventor
務 小森
勇 鹿毛
塩谷　和彦
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JFE Steel Corp
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JFE Steel Corp
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Priority claimed from JP2011238543A external-priority patent/JP5786650B2/ja
Application filed by JFE Steel Corp filed Critical JFE Steel Corp
Priority to IN765KON2014 priority Critical patent/IN2014KN00765A/en
Priority to KR1020147011943A priority patent/KR101568775B1/ko
Priority to CN201280053087.8A priority patent/CN104023972B/zh
Publication of WO2013065349A1 publication Critical patent/WO2013065349A1/ja
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
    • 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
    • C09D5/103—Anti-corrosive paints containing metal dust containing Al
    • 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
    • C09D7/00—Features of coating compositions, not provided for in group C09D5/00; Processes for incorporating ingredients in coating compositions
    • C09D7/40—Additives
    • 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
    • B05D1/30—Processes for applying liquids or other fluent materials performed by gravity only, i.e. flow coating
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05D—PROCESSES FOR APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • 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
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B15/00—Layered products comprising a layer of metal
    • B32B15/04—Layered products comprising a layer of metal comprising metal as the main or only constituent of a layer, which is next to another layer of the same or of a different material
    • B32B15/08—Layered products comprising a layer of metal comprising metal as the main or only constituent of a layer, which is next to another layer of the same or of a different material of synthetic resin
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B27/00—Layered products comprising a layer of synthetic resin
    • B32B27/18—Layered products comprising a layer of synthetic resin characterised by the use of special additives
    • 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
    • C09D201/00—Coating compositions based on unspecified macromolecular compounds
    • 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
    • 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
    • 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
    • C09D5/106—Anti-corrosive paints containing metal dust containing Zn
    • 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
    • C09D5/29—Coating compositions, e.g. paints, varnishes or lacquers, characterised by their physical nature or the effects produced; Filling pastes for multicolour effects
    • 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
    • C23C26/00—Coating not provided for in groups C23C2/00 - C23C24/00

Definitions

  • the present invention has excellent laser cutting performance and primary rust prevention performance, and has excellent legibility, especially with a white paint. It relates to steel (painted steel).
  • Fabricators such as shipbuilding, bridges, construction machines, etc., have high dimensional accuracy ( ⁇ 0.5 mm) and have a thermal influence on the members.
  • laser cutting has a problem that the cutting speed is slow compared with plasma cutting, and the plate thickness that can be cut is limited compared to gas cutting (limitation of cutting plate thickness). It was.
  • Patent Document 1 in view of the fact that Zn contained in the coating film (primer layer) adversely affects laser cutting properties, by limiting the amount of Zn in the coating film added as a rust inhibitor, Techniques for improving laser cutting performance have been proposed.
  • Zn is an element effective for rust prevention, and the rust prevention property of the coating film is reduced by limiting the amount of Zn.
  • Patent Document 1 discloses prevention by limiting the amount of Zn in the coating film. There is no description on how to compensate for the decrease in rust.
  • Patent Document 2 discloses a high corrosion resistant paint with a mixed powder of Zn: 65 to 85 wt% and Al: 3 to 15 wt% as a heat and anticorrosion paint. ) To improve the corrosion resistance (rust resistance) and heat resistance of the coating film has been proposed. However, the technique proposed in Patent Document 2 does not consider laser cutting performance at all. And as the example shows, in the technique proposed in Patent Document 2, the film thickness at the time of coating is set to a thick film thickness of 75 ⁇ m in order to ensure high corrosion resistance. Therefore, since the amount of (Zn + Al) contained in the coating film increases as the film thickness increases, the laser cutting property is considered to be low.
  • Patent Document 3 proposes a technique for improving the corrosion resistance of a coated metal plate by using a highly corrosion-resistant paint made of Zn—Al—Mg alloy powder.
  • a highly corrosion-resistant paint made of Zn—Al—Mg alloy powder since Zn, Al, and Mg are alloyed and powdered, the manufacturing cost of paint is increased compared to the case of using a single Zn powder or Al powder. To do.
  • no consideration is given to laser cutting performance.
  • the film thickness at the time of coating is set to a thick film thickness of 60 ⁇ m in order to ensure high corrosion resistance. Therefore, similarly to the technique proposed in Patent Document 2, the amount of (Zn + Al) contained in the coating film is increased, so that the laser cutting property is considered to be low.
  • Patent Document 4 proposes a technique in which a primer contains titania powder in addition to zinc powder and aluminum powder. And according to the technique proposed in Patent Document 4, the laser cutting property and primary rust prevention property of the coated steel material are improved by optimizing the content of titania powder, zinc powder and aluminum powder contained in the primer. ing.
  • the technique proposed in Patent Document 4 since the white titania powder is included, the primer surface is whitened, and the manufacturing symbol using the white paint generally used for clarifying the history of the steel material is used. There was a problem that characters were difficult to distinguish.
  • Japanese Patent Laid-Open No. 10-226846 JP 59-221361 A JP 2001-164194 A Japanese Patent No. 4449938 Japanese Patent Laid-Open No. 2007-290129
  • Patent Document 4 a coated steel material with excellent laser cutting property and primary rust prevention property can be obtained, but in the actual manufacturing process, the surface of the developed steel material becomes white and the history of the steel material is clarified. Therefore, there is a problem that it is difficult to distinguish characters such as manufacturing symbols using white paint generally used.
  • a color pigment may be added, there is no description of the characteristics of the color pigment to be specifically added and the addition amount thereof. For this reason, there is a problem that the laser cutting property is lowered depending on the type of the color pigment to be selected.
  • the present invention has been made in view of such circumstances, and when cut with a laser, the laser cutting performance is high, the rust prevention is excellent, and the visibility, particularly the visibility of characters written with a white paint.
  • An object is to provide a coated steel material having an excellent coating film.
  • Patent Document 4 In order to solve the above problems, the inventors of the technology proposed in Patent Document 4 have various effects that affect the visibility, particularly the visibility of characters indicating the serial number of the steel material described on the surface of the coated steel material. The factors were studied earnestly. As a result, it came to the idea of adopting the brightness (Munsell value) brightness of the Munsell value as an index necessary for improving the visibility of the coating film surface formed on the surface of the steel material. And the color pigment (color pigment) which makes the lightness of the Munsell value of a coating-film surface 7.0 or less to the technique proposed in patent document 4, ie, the coating containing titania powder, zinc powder, and aluminum powder. It has been found that visibility is dramatically improved by the inclusion.
  • the laser cutting property and primary rust prevention of the steel material are not impaired, and visibility with the white pigment (visibility of characters written with white paint) It was found that it is possible to improve.
  • a desired formula that defines the amount of the color component (color pigment) relative to the amount of the additive component in the coating film component total amount of titania powder, zinc powder, aluminum powder
  • the content of the color pigment It was found that an appropriate range can be obtained.
  • the present invention has been completed based on the above findings, and the gist thereof is as follows. [1] It comprises one or more of titania powder, zinc powder, aluminum powder, black iron oxide pigment (black oxide pigment), and black calcined pigment (pigmented pigment) as a dry coating on the surface of the steel material.
  • a coloring pigment is contained, the content of the titania powder is 4.5 g / m 2 or more and 26 g / m 2 or less, the content of the zinc powder is 5 g / m 2 or more and 30 g / m 2 or less, and the content of the aluminum powder Is 0.1 g / m 2 or more and 10 g / m 2 or less, the titania powder content is Ag / m 2 , the zinc powder content is Bg / m 2 , and the aluminum powder content is Cg / m 2.
  • the content of the titania powder is 8.0 g / m 2 or more and 18 g / m 2 or less
  • the content of the zinc powder is 13 g / m 2 or more and 27 g / m 2 or less
  • the content is 0.5 g / m 2 or more and 1.5 g / m 2 or less
  • the content of the color pigment is 1.0 g / m 2 or more and 5.0 g / m 2 or less, and is represented by the formula (1).
  • the dry coating film may further contain a single element of one or more elements selected from Mo, W, Ni, Cu, Mg, V, Co, Sn, and Sb, and And / or a compound of one or more elements of Mo, W, Ni, Cu, P, Mg, V, Co, Sn, and Sb, and a simple substance of the element and / or a compound of the element
  • a coated steel material excellent in laser cutting property, primary rust prevention property and visibility characterized in that the total content is 0.01 g / m 2 or more and 5 g / m 2 or less in terms of element.
  • a colored pigment black iron oxide
  • a titania powder a zinc powder, and an aluminum powder having a high laser absorptivity, and having a Munsell value lightness of 7.0 or less on the surface of the dried coating film.
  • the coated steel material of the present invention contains, on the surface of the steel material, a colored pigment composed of one or more of titania powder, zinc powder, aluminum powder, black iron oxide pigment, and black fired pigment as a dry coating film,
  • the titania powder content is 4.5 g / m 2 or more and 26 g / m 2 or less
  • the zinc powder content is 5 g / m 2 or more and 30 g / m 2 or less
  • the aluminum powder content is 0.1 g / m 2.
  • the titania powder content is Ag / m 2
  • the zinc powder content is Bg / m 2
  • the aluminum powder content is Cg / m 2
  • the value of Y represented by the following formula (1) is 0.010 or more and 0.200 or less
  • the lightness of the Munsell value on the surface of the dried coating film is 7.
  • Y X / (A + B + C) (1)
  • “Munsell value brightness” is an index indicating the degree of color brightness in the color display method defined in JIS Z 8721 (1993). This represents a series of black to gray to white, where ideal black is zero and ideal white is 10, and the numbers are divided and expressed as numbers so that the difference in brightness perception is almost equal.
  • zinc (Zn) rich primer (zinc primer) or zinc primer (primer) was applied to the surface of shot-blasted steel as primary rust prevention treatment. It is known that when a steel material is laser cut, the cutting speed is reduced. The mechanism of the laser cutting speed reduction at this time is not necessarily clear, but by the coating film formation (primer painting) performed as the primary rust prevention treatment, (1) the coating film ( Decrease of laser absorption rate (laser absorbance index) by primary rust prevention agent (2) Binder resin in coating film (primary rust prevention agent) by heating at laser cutting Scattering and absorption of laser light by decomposition and evaporation of zinc powder and (3) assist gas by generated gas (assist gas) Such as reduction of the partial pressures of oxygen) (partial pressure) is estimated to be a factor of lowering the laser cutting speed.
  • the above-mentioned problem (1) is solved by adding titania (TiO 2 ) powder having high laser absorption to the coating film of the coated steel material to increase the laser absorption rate, and laser cutting properties.
  • titania (TiO 2 ) powder having high laser absorption to the coating film of the coated steel material to increase the laser absorption rate, and laser cutting properties.
  • Titania powder is extremely effective in laser absorption and efficient discharge of molten slag from within the cut groove. Therefore, the addition of titania powder reduces the viscosity of the molten slag generated during laser cutting, and the molten slag is efficiently discharged from the cutting groove, thereby improving the beauty of the cut surface and adhering to the back of the cut part. It is also possible to suppress the occurrence of dross. Moreover, since titania powder can be easily obtained and is relatively inexpensive, the present invention using titania powder is advantageous in terms of stable production and cost.
  • the content of titania powder contained in the coating film (dried coating film) of the coated steel material is in the range of 4.5 g / m 2 or more and 26 g / m 2 or less.
  • the titania powder content is less than 4.5 g / m 2 , the effect of improving the laser cutting property is small.
  • the content of the titania powder exceeds 26 g / m 2 , the formation of a uniform coating film is hindered, which may hinder the improvement of rust prevention. Therefore, the content of the titania powder is 4.5 g / m 2 or more and 26 g / m 2 or less.
  • it is 8.0 g / m 2 or more and 18 g / m 2 or less.
  • zinc (Zn) powder is a component that is extremely effective for improving the primary rust prevention property, and is also a component that causes the above problems (2) and (3).
  • zinc (Zn) powder is a component that is extremely effective for improving the primary rust prevention property, and is also a component that causes the above problems (2) and (3).
  • aluminum (Al) powder having an effect of improving primary rust prevention is added while suppressing the zinc powder content of the coating film.
  • the content of zinc powder contained in the coating film is preferably 5 g / m 2 or more and 30 g / m 2 or less. If the content of the zinc powder is less than 5 g / m 2 , the rust prevention property of the coated steel material may be insufficient even if the aluminum powder is added. On the other hand, if the zinc powder content exceeds 30 g / m 2 , the laser cutting property may be insufficient even when titania powder is added. Therefore, the content of the zinc powder is 5 g / m 2 or more and 30 g / m 2 or less. Preferably at 13 g / m 2 or more 27 g / m 2 or less.
  • Aluminum powder is added for the purpose of suppressing deterioration in rust prevention caused by reducing the amount of zinc powder added, but the content of aluminum powder contained in the coating film (dry coating film) is 0. If it is less than 1 g / m 2 , the effect may not be sufficiently exhibited. On the other hand, when the content of the aluminum powder exceeds 10 g / m 2 , the formation of a uniform coating film is hindered, and on the contrary, the rust prevention property may be lowered. Therefore, the content of aluminum powder and 0.1 g / m 2 or more 10 g / m 2 or less. Preferably is 0.5 g / m 2 or more 1.5 g / m 2 or less.
  • a coated steel material having a high laser cutting property and an excellent rust prevention property can be obtained.
  • the coating surface is whitened due to the addition of titania powder, so the production symbol using the white paint generally used to clarify the history of steel materials Is difficult to distinguish.
  • the brightness of the surface of the coated steel material having the whitened coating film obtained as described above was measured, it was confirmed that the brightness of the Munsell value was about 7.5.
  • the present inventors have examined the Munsell value on the surface of the steel material so that the characters written in the white paint can be easily discerned visually, and found that it is necessary to set the value to 7.0 or less.
  • the coating film formed on the steel material in addition to the titania powder, zinc powder, and aluminum powder, the coating film formed on the steel material further contains a coloring pigment having a Munsell value lightness of 7.0 or less on the coating film surface.
  • the Munsell value when the Munsell value is set to 7.0 or less, the surface of the paint film having a gray color tone equivalent to that of a paint film using a zinc (Zn) rich primer or a zinc primer that is generally used (painting)
  • the surface of the coated steel material can be easily distinguished even when the surface of the coated steel material is marked with a production symbol using a white paint.
  • the brightness of the Munsell value is preferably 6.3 or less, and more preferably 5.8 or less.
  • the brightness of the Munsell value is less than 5.0, the content of white titania powder among the components constituting the coating film is forced to be reduced, and the laser is reduced along with the reduction in the content of titania powder. There is a concern that the cutting property may deteriorate. Therefore, the lightness of the Munsell value is preferably 5.0 or more and 7.0 or less. Moreover, it is more preferable to set it as 5.5 or more and 6.5 or less.
  • the black color pigments used for setting the Munsell value lightness on the surface of the dried coating film to 7.0 or less are limited to specific types as described above.
  • a color containing carbon as a main component such as carbon black, graphite, or black organic pigment, which is usually added to a paint as a black pigment.
  • the laser cutting property of the coated steel material tends to decrease. This is because, when a color pigment containing carbon as a main component is included in the coating film, CO gas / CO 2 gas is generated by an oxidation reaction at the time of laser cutting, and oxygen partial pressure (oxygen partial) of the cut portion is generated.
  • Black iron oxide pigments and black calcined pigments are sometimes called composite oxide pigments.
  • Fe 3 O 4 -based, Fe-Cr-based, Fe-Cr-Ni-Mn-based, Co-Fe-Cr-based and Cu- A number of Cr-Mn-based materials are known, but are not limited to them, and any inorganic component-based material containing almost no carbon and organic matter can be used.
  • a coloring pigment that further sets the lightness of the Munsell value on the surface of the dried coating film to 7.0 or less.
  • the amount of the color pigment added is Ag / m 2 for the titania powder, Bg / m 2 for the zinc powder, Cg / m 2 for the aluminum powder and Xg / m 2 for the aluminum powder contained in the coating film (dry coating film).
  • the value of Y represented by the formula (1): Y X / (A + B + C) is set to be 0.010 or more and 0.200 or less.
  • the value of Y that is, the ratio of the total content of titania powder, zinc powder and alumina powder, which is a white substance contained in the coating film (dry coating film), and the content of the color pigment is 0.010 or more. If it exists, the lightness of the Munsell value will be 7.0 or less, and visibility will improve. Preferably it is 0.030 or more.
  • the value of Y exceeds 0.200, the laser cutting property may be deteriorated or the occurrence of red rust due to black iron oxide, which is a coloring pigment, may be visually observed in the corrosion resistance evaluation. In addition, although these causes are not certain, it is estimated that the abundance ratio of titania having high laser absorptivity on the surface of the coated steel material is reduced.
  • the value of Y exceeds 0.200, corrosion resistance (rust prevention) may be deteriorated. Therefore, the value of Y is set to 0.200 or less. Preferably it is 0.100 or less.
  • Addition of 1.0 g / m 2 or more of the color pigment further improves the visibility when writing white letters on the steel sheet, while addition of more than 5.0 g / m 2 improves corrosion resistance and labeling. Since the cutting property may be adversely affected, the content of the color pigment contained in the coating film (dried coating film) is 1.0 g / m 2 or more and 5.0 g / m 2 or less, and the formula (1) It is preferable that the Y value represented is 0.030 or more and 0.200 or less.
  • the dry coating film preferably contains a predetermined amount of one or more elements of Mo, W, Ni, Cu, P, Mg, V, Co, Sn, and Sb.
  • Corrosion resistance is further improved by adding elements such as Mo, W, Ni, Cu, P, Mg, V, Co, Sn, and Sb alone or in combination to the coating film.
  • the reason why the corrosion resistance is further improved is not clear, but when these elements are added to the coating film, a dense corrosion product or a stable complex oxide is formed.
  • the above-mentioned elements are dispersed in rust, or become oxyacid ions, thereby suppressing the ingress of Cl ions that cause the corrosion to progress, and the effect of suppressing the corrosion progression is obtained. It is estimated that
  • One or more elements of Mo, W, Ni, Cu, Mg, V, Co, Sn, and Sb can be contained in the coating film as a simple substance or as a compound.
  • P element can be contained as a compound.
  • one or more elements of Mo, W, Ni, Cu, P, Mg, V, Co, Sn, and Sb are 0.01 g / m 2 or more and 5 g / m 2 or less in terms of element. It is preferable to do. It is more preferable that the 0.1 g / m 2 or more 4g / m 2 or less.
  • the coating film is an alkyl silicate-based resin made of a binder (alkyl silicate-based binder resin).
  • alkyl silicate-based binder resin alkyl silicate-based binder resin
  • the coating film of the present invention including titania powder having high laser absorption is different from the coating film of zinc powder and the conventional coating film in which aluminum powder is added to zinc powder, in the process of laser cutting.
  • the coating film is essentially different in that it has the function of efficiently absorbing the light energy of the laser light and facilitating the discharge of molten slag.
  • the titania powder having high laser absorption is contained in the coating film, even if the coating film contains zinc powder that adversely affects laser cutting properties, the content is reduced to a predetermined amount. If so, the light energy of the laser light can be efficiently absorbed by the titania powder at the initial stage of laser cutting, and a coated steel material having excellent laser cutting properties can be obtained.
  • aluminum powder, Mo, W, Ni, Cu, P, Mg, V, Co, Sn, and Sb have an effect of improving corrosion resistance without adversely affecting laser cutting properties. Therefore, in the coating film, in addition to the titania powder and zinc powder, aluminum powder, or further, one or more of Mo, W, Ni, Cu, P, Mg, V, Co, Sn, Sb By adding the element, the deterioration of the corrosion resistance accompanying the reduction of the zinc powder content is suppressed, and the characteristics excellent in laser cutting property are maintained.
  • the surface of the steel material body has one or more of titania powder and zinc powder and aluminum powder, or Mo, W, Ni, Cu, P, Mg, V, Co, Sn, and Sb.
  • a coating film (primer) containing two or more elements as a simple substance or as a compound is provided.
  • any kind of color pigment may be used in addition to the color pigment, and it is a color pigment having a Munsell value of 7.0 or less in order to ensure visibility with a white pigment, and is mainly composed of carbon. It is characterized by the fact that it is a colored pigment made of black iron oxide pigment and black fired pigment, and it can be said that the coating film is different from the conventional technique and could not be estimated from the conventional technique.
  • titania powder zinc powder, and aluminum powder
  • those processed by an atomizing method or a mechanical crushing method can be used, and the average particle size is controlled to 15 ⁇ m or less. Is desirable.
  • These powders may be subjected to a surface treatment with Al, Zr, polyol, or the like to enhance dispersibility in the coating, as necessary.
  • paint additives other than these powders and binder resins a dispersant, a wetting agent, a defoaming agent, an anti-sedimentation agent, and a thickening agent. (Thickener) or the like may be added as necessary.
  • Each metal powder can be used as a simple substance of Mo, W, Ni, Cu, Mg, V, Co, Sn, and Sb. Further, as the compound of Mo, W, Ni, Cu, P, Mg, V, Co, Sn, Sb, a compound that becomes an ion of each element or an oxyacid ion of each element in an aqueous solution is suitable. , Molybdate such as molybdic acid, sodium molybdate, phosphomolybdate such as phosphomolybdic acid, sodium phosphomolybdate?
  • tungstate tungstic acid
  • tungstate such as sodium tungstate (sodium tungstate), linter Phosphotungstic acid, phosphotungstate such as sodium phosphotungstate, nickel sulfate, nickel phosphate such as nickel phosphate, copper sulfate, etc.
  • Copper salt phosphoric acid (phosphoric acid), phosphate such as calcium phosphate (calcium phosphate), magnesium nitrate (magnesium sulfate), magnesium sulfate (magnesium sulfate), magnesium salts (magnesium sulfate) Sodium vanadate (sod um vanadate and other cobalt salts such as salt nitrate, cobalt nitrate, cobalt sulfate, and stannous oxide. (Stannic oxide), stannous chloride, stannous sulfate, antimony trioxide, antimony pentoxide (antimony pentoxide), antimony pentoxide (antimony pentoxide) antimony salt such as chloride) can be used.
  • substrate of the coated steel material of this invention is not specifically limited, It is generally used for the steel plate of about 25 mm in plate thickness.
  • titania powder, zinc powder, and aluminum powder are put into a paint liquid defined in JIS K 5552, and further, a predetermined coloring pigment is added, and mixed thoroughly by a shaker machine or the like. • Blended and agitated to prepare paint.
  • a paint liquid defined in JIS K 5552
  • a predetermined coloring pigment is added, and mixed thoroughly by a shaker machine or the like. • Blended and agitated to prepare paint.
  • one or more elements of Mo, W, Ni, Cu, P, Mg, V, Co, Sn, and Sb are contained as a simple substance or as a compound
  • titania powder, zinc powder, A simple substance or a compound of these elements together with the aluminum powder is powdered and introduced into the coating liquid.
  • the prepared paint is subjected to, for example, an air-spray painting apparatus, and the content of each of titania powder, zinc powder, aluminum powder and coloring pigment in the coating film after drying is applied to the steel sheet.
  • Desirable content in terms of element so that the desired content is obtained or the total content of one or more of Mo, W, Ni, Cu, P, Mg, V, Co, Sn, and Sb
  • the coated steel material is obtained by adjusting the spray ejection rate and the spray velocity so that the amount of the spray is adjusted.
  • the titania powder content, zinc powder content, aluminum powder content and color pigment content in the dried coating film should be the values shown in Table 1.
  • the base steel material a rolled steel material for welded structure, SM490A class, having a size of 200 mm ⁇ 100 mm ⁇ thickness 12 mm and having a surface subjected to shot blasting was used.
  • titania powder, zinc powder and aluminum powder are added to the coating liquid composed of alkyl silicate binder resin and thinner, and Mo, W, Ni, Cu, P , Mg, V, Co, Sn, Sb, or a compound of one or more elements, powdered, added and mixed, and further added and dispersed color pigment to prepare paint for coating film Then, it spray-coated on the steel material surface.
  • a rolled steel for welded structure (SM490A class) having a size of 200 mm ⁇ 100 mm ⁇ thickness 12 mm and having a surface subjected to shot blasting was used.
  • the coated steel materials thus obtained were evaluated for laser cutting properties, rust prevention properties, and visibility according to the following methods.
  • Laser cutting ability> The various coated steel materials obtained were subjected to a cutting test by laser cutting.
  • Laser cutting uses carbon dioxide laser apparatus manufactured by Mitsubishi Electric Co., Ltd. (carbon dioxide manufactured by Mitsubishi Electric Corporation) with an output of 2.1 kW as an assist gas and an oxygen gas of 0.1 MPa.
  • the property of the laser cut surface when cutting at a laser cutting speed of 1000 mm / min was visually observed.
  • the evaluation criteria are as follows. (Double-circle): It is the best cut surface, and there is no generation
  • ⁇ Almost good cut surface, in which dross was generated in part, but the cut surface is in place.
  • ⁇ Dross occurred in 50% or more of the total length of the cutting line, but it was completely cut.
  • X A state in which dross was generated on almost the entire cutting line and a part of the cutting line was not cut.
  • the dross refers to an adherent formed by cooling and solidifying molten metal containing a gas generated along a cutting line on the surface opposite to the laser irradiation surface at the time of cutting.
  • Rust prevention was evaluated by a salt spray test in accordance with JIS K 5552 (2002) zinc rich primer. About the obtained various coated steel materials, the number of days until red rust (red rust) was generated was measured by a salt spray test defined in JIS K 5552 (2002). The evaluation criteria are as follows. A: The number of days until red rust occurs is 50 days or more (excellent). A: The number of days until red rust occurs is 30 days or more (excellent). ⁇ : The number of days until red rust occurs is 18 days or more and less than 30 days (good). X: The number of days until red rust occurs is less than 18 days (bad).
  • ⁇ Visibility> The letters “8” and “3” are written in white paint on each of the various coated steel materials obtained with a size of 8 cm ⁇ 10 cm so that the illuminance on the surface becomes 300 lux. 2 (1.2 vision) humans were observed from 10 m away, 6 m away and 2 m away, and the readability of the characters was evaluated.
  • the evaluation criteria are as follows. A: When characters can be distinguished and read from a place 10 m away. ⁇ : It is difficult to distinguish and read characters from a place 10 m away, but it is possible to distinguish and read characters from a place 6 m away. X: When the character cannot be distinguished and read unless it is close to 2m away.
  • Painted steel material No. 1-4, 9-14, 17, 18, 23-38 are those in which a coating film is formed on the surface of the steel sheet according to the present invention.
  • the surface properties were ⁇ or ⁇ , and the salt spray red rust generation days were 20 days or more.
  • 1A shows a painted steel material No. 1 as an example of the present invention.
  • No. 2 is a photograph showing the characters on the coated steel plate when the visibility of the coated steel plate is ⁇ : the characters can be distinguished and read from a place 10 m away.
  • FIG. 1B shows a coated steel material No. 1 as a comparative example. It is a photograph which shows the character on the coated steel plate when evaluation of visibility with 22 coated steel plates cannot distinguish and read a character unless it approaches x: 2m away. Compared with FIG. 1A which is an example of the present invention, it can be well recognized that the visibility of characters is poor.
  • coated steel material having excellent laser cutting property and primary rust prevention property and excellent visibility of characters written with white paint according to the present invention can be widely applied to steel plates used in shipbuilding, bridges, construction, and the like.

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PCT/JP2012/064731 2011-10-31 2012-06-01 レーザ切断性、一次防錆性および視認性に優れた塗装鋼材 Ceased WO2013065349A1 (ja)

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CN201280053087.8A CN104023972B (zh) 2011-10-31 2012-06-01 激光切割性、初级防锈性和辨识性优异的涂装钢材

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JP2014148613A (ja) * 2013-02-01 2014-08-21 Dainippon Toryo Co Ltd 亜鉛末含有塗料組成物
JPWO2018062527A1 (ja) * 2016-09-29 2019-06-24 Ｊｘ金属株式会社 レーザー焼結用表面処理金属粉

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KR102402639B1 (ko) 2017-11-24 2022-05-26 삼성전자주식회사 전자 장치 및 그의 통신 방법

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JP2000248388A (ja) * 1999-03-02 2000-09-12 Nkk Corp 金属材印字・防錆方法
JP2005095711A (ja) * 2003-09-22 2005-04-14 Nippon Steel Corp クリヤー塗装金属板
JP2007230114A (ja) * 2006-03-02 2007-09-13 Nippon Steel & Sumikin Coated Sheet Corp 塗装金属板
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JP2009078374A (ja) * 2007-09-25 2009-04-16 Ikeda Electric Co Ltd 樹脂被覆金属材への印字方法、及び印字を備えた樹脂被覆金属材

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JP2000248388A (ja) * 1999-03-02 2000-09-12 Nkk Corp 金属材印字・防錆方法
JP2005095711A (ja) * 2003-09-22 2005-04-14 Nippon Steel Corp クリヤー塗装金属板
JP2007290129A (ja) * 2005-04-20 2007-11-08 Jfe Steel Kk レーザー切断性および一次防錆性に優れた塗装鋼材およびそれに用いられる塗料
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JP2014148613A (ja) * 2013-02-01 2014-08-21 Dainippon Toryo Co Ltd 亜鉛末含有塗料組成物
JPWO2018062527A1 (ja) * 2016-09-29 2019-06-24 Ｊｘ金属株式会社 レーザー焼結用表面処理金属粉
JP2020073727A (ja) * 2016-09-29 2020-05-14 Ｊｘ金属株式会社 レーザー焼結用表面処理金属粉
JP7079237B2 (ja) 2016-09-29 2022-06-01 Ｊｘ金属株式会社 レーザー焼結用表面処理金属粉

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KR101568775B1 (ko) 2015-11-12

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