WO2015080066A1 - 表面処理皮膜付き亜鉛系めっき鋼板およびその製造方法 - Google Patents
表面処理皮膜付き亜鉛系めっき鋼板およびその製造方法 Download PDFInfo
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- C23C22/00—Chemical surface treatment of metallic material by reaction of the surface with a reactive liquid, leaving reaction products of surface material in the coating, e.g. conversion coatings, passivation of metals
- C23C22/05—Chemical surface treatment of metallic material by reaction of the surface with a reactive liquid, leaving reaction products of surface material in the coating, e.g. conversion coatings, passivation of metals using aqueous solutions
- C23C22/06—Chemical surface treatment of metallic material by reaction of the surface with a reactive liquid, leaving reaction products of surface material in the coating, e.g. conversion coatings, passivation of metals using aqueous solutions using aqueous acidic solutions with pH less than 6
- C23C22/40—Chemical surface treatment of metallic material by reaction of the surface with a reactive liquid, leaving reaction products of surface material in the coating, e.g. conversion coatings, passivation of metals using aqueous solutions using aqueous acidic solutions with pH less than 6 containing molybdates, tungstates or vanadates
- C23C22/42—Chemical surface treatment of metallic material by reaction of the surface with a reactive liquid, leaving reaction products of surface material in the coating, e.g. conversion coatings, passivation of metals using aqueous solutions using aqueous acidic solutions with pH less than 6 containing molybdates, tungstates or vanadates containing also phosphates
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- C23C22/06—Chemical surface treatment of metallic material by reaction of the surface with a reactive liquid, leaving reaction products of surface material in the coating, e.g. conversion coatings, passivation of metals using aqueous solutions using aqueous acidic solutions with pH less than 6
- C23C22/07—Chemical surface treatment of metallic material by reaction of the surface with a reactive liquid, leaving reaction products of surface material in the coating, e.g. conversion coatings, passivation of metals using aqueous solutions using aqueous acidic solutions with pH less than 6 containing phosphates
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- 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
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
- B05D—PROCESSES FOR APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
- B05D7/00—Processes, other than flocking, specially adapted for applying liquids or other fluent materials to particular surfaces or for applying particular liquids or other fluent materials
- B05D7/24—Processes, other than flocking, specially adapted for applying liquids or other fluent materials to particular surfaces or for applying particular liquids or other fluent materials for applying particular liquids or other fluent materials
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- C23C—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THE SURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTION; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL
- C23C2/00—Hot-dipping or immersion processes for applying the coating material in the molten state without affecting the shape; Apparatus therefor
- C23C2/26—After-treatment
- C23C2/28—Thermal after-treatment, e.g. treatment in oil bath
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- C23C—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THE SURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTION; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL
- C23C2/00—Hot-dipping or immersion processes for applying the coating material in the molten state without affecting the shape; Apparatus therefor
- C23C2/34—Hot-dipping or immersion processes for applying the coating material in the molten state without affecting the shape; Apparatus therefor characterised by the shape of the material to be treated
- C23C2/36—Elongated material
- C23C2/40—Plates; Strips
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- 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
- C23C22/00—Chemical surface treatment of metallic material by reaction of the surface with a reactive liquid, leaving reaction products of surface material in the coating, e.g. conversion coatings, passivation of metals
- C23C22/05—Chemical surface treatment of metallic material by reaction of the surface with a reactive liquid, leaving reaction products of surface material in the coating, e.g. conversion coatings, passivation of metals using aqueous solutions
- C23C22/06—Chemical surface treatment of metallic material by reaction of the surface with a reactive liquid, leaving reaction products of surface material in the coating, e.g. conversion coatings, passivation of metals using aqueous solutions using aqueous acidic solutions with pH less than 6
- C23C22/07—Chemical surface treatment of metallic material by reaction of the surface with a reactive liquid, leaving reaction products of surface material in the coating, e.g. conversion coatings, passivation of metals using aqueous solutions using aqueous acidic solutions with pH less than 6 containing phosphates
- C23C22/08—Orthophosphates
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- 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
- C23C22/00—Chemical surface treatment of metallic material by reaction of the surface with a reactive liquid, leaving reaction products of surface material in the coating, e.g. conversion coatings, passivation of metals
- C23C22/73—Chemical surface treatment of metallic material by reaction of the surface with a reactive liquid, leaving reaction products of surface material in the coating, e.g. conversion coatings, passivation of metals characterised by the process
- C23C22/77—Controlling or regulating of the coating process
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- C23C—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THE SURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTION; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL
- C23C28/00—Coating for obtaining at least two superposed coatings either by methods not provided for in a single one of groups C23C2/00 - C23C26/00 or by combinations of methods provided for in subclasses C23C and C25C or C25D
- C23C28/30—Coatings combining at least one metallic layer and at least one inorganic non-metallic layer
- C23C28/32—Coatings combining at least one metallic layer and at least one inorganic non-metallic layer including at least one pure metallic layer
- C23C28/322—Coatings combining at least one metallic layer and at least one inorganic non-metallic layer including at least one pure metallic layer only coatings of metal elements only
- C23C28/3225—Coatings combining at least one metallic layer and at least one inorganic non-metallic layer including at least one pure metallic layer only coatings of metal elements only with at least one zinc-based layer
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- C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
- C23C—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THE SURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTION; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL
- C23C28/00—Coating for obtaining at least two superposed coatings either by methods not provided for in a single one of groups C23C2/00 - C23C26/00 or by combinations of methods provided for in subclasses C23C and C25C or C25D
- C23C28/30—Coatings combining at least one metallic layer and at least one inorganic non-metallic layer
- C23C28/34—Coatings combining at least one metallic layer and at least one inorganic non-metallic layer including at least one inorganic non-metallic material layer, e.g. metal carbide, nitride, boride, silicide layer and their mixtures, enamels, phosphates and sulphates
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- C25D—PROCESSES FOR THE ELECTROLYTIC OR ELECTROPHORETIC PRODUCTION OF COATINGS; ELECTROFORMING; APPARATUS THEREFOR
- C25D3/00—Electroplating: Baths therefor
- C25D3/02—Electroplating: Baths therefor from solutions
- C25D3/22—Electroplating: Baths therefor from solutions of zinc
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- C25—ELECTROLYTIC OR ELECTROPHORETIC PROCESSES; APPARATUS THEREFOR
- C25D—PROCESSES FOR THE ELECTROLYTIC OR ELECTROPHORETIC PRODUCTION OF COATINGS; ELECTROFORMING; APPARATUS THEREFOR
- C25D5/00—Electroplating characterised by the process; Pretreatment or after-treatment of workpieces
- C25D5/48—After-treatment of electroplated surfaces
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- 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
- C23C2222/00—Aspects relating to chemical surface treatment of metallic material by reaction of the surface with a reactive medium
- C23C2222/20—Use of solutions containing silanes
Definitions
- the present invention relates to a zinc-based plated steel sheet with a surface-treated film suitable for use in an environmentally conscious motor case, which does not contain a pollution control substance such as hexavalent chromium in the surface-treated film formed on the surface of the zinc-based plated steel sheet, and It relates to a manufacturing method.
- chromate treatment was applied to the surface of galvanized steel sheets with a treatment liquid mainly composed of chromic acid, dichromic acid or its salts.
- Steel plates have been widely used.
- chromium-free treated steel sheets due to recent global environmental problems, there is an increasing demand for adopting non-polluted surface-treated steel sheets that do not depend on chromate treatment, so-called chromium-free treated steel sheets.
- Such a surface-coated zinc-coated steel sheet (hereinafter, also simply referred to as “steel sheet” in the background art section) is often used as a part of automobiles, home appliances, OA equipment, and the like.
- press molding such as drawing is performed.
- continuous high-speed press forming may be performed in which lubricating oil is applied to the surface of a steel plate and 100 or more molded products are produced per minute with a progressive press or the like.
- this continuous high-speed press forming there has been a problem that the surface treatment film peels off due to the sliding of the steel plate and the mold, or a part of the zinc-based plating layer peels off.
- a metallic luster is generated on a part of the surface of the molded product, and the appearance is remarkably impaired or the corrosion resistance is deteriorated.
- zinc-based plated steel sheets for motor cases are mostly used unpainted, and surface appearance is important. For this reason, zinc-based plated steel sheets for motor case use are required to have no surface alteration or discoloration from production to press molding. Therefore, various performances such as flat plate corrosion resistance, blackening resistance and water stain resistance are required for zinc-based plated steel sheets for motor cases.
- Patent Document 2 discloses a zinc-based material in which a surface treatment film is formed by a surface treatment liquid containing lithium silicate, a silane coupling agent, a vanadium compound, a titanium compound and a wax, and blackening is suppressed when deep drawing is performed. Techniques for obtaining plated steel sheets are described.
- a surface treatment film is formed with a surface treatment liquid containing lithium silicate and sodium silicate as main components, and further containing a silane coupling agent and a vanadium compound, and deep drawing is performed.
- a technique for obtaining a galvanized steel sheet that suppresses the occurrence of darkening is described.
- Patent Document 1 is directed to suppressing darkening after press molding.
- improvement from the viewpoint of improving the above-described high level of darkening resistance It turns out that there is room.
- Patent Documents 2 and 3 are techniques for forming a surface treatment film from a surface treatment liquid mainly composed of lithium silicate. Since the silicate-based coating does not have sufficient adhesion to the zinc-based plating layer, when a high surface pressure is applied during press molding, the surface-treated coating is peeled off and the zinc-based plating layer is exposed. There arises a problem that flake-like exfoliation is generated from the zinc-based plating layer due to sliding of the mold (the flake-like plating releasability is inferior).
- the present invention is (1) excellent in blackening resistance after being subjected to severe ironing such as continuous high-speed press molding, and (2) flake-resistant after being subjected to severe ironing such as continuous high-speed press molding.
- An object of the present invention is to provide a zinc-plated steel sheet with a surface-treated film that is excellent in strip-like plating peelability and can suppress the dependency of blackening resistance on the adhesion amount and a method for producing the same.
- the present inventors are composed of a zirconium carbonate compound (A), a phosphoric acid compound (B), and the like, each of which is a zirconium carbonate compound of the phosphoric acid compound (B).
- A zirconium carbonate compound
- B phosphoric acid compound
- X surface treatment liquid
- Y surface treatment liquid
- the present invention provides the following (1) to (5).
- the first surface treatment liquid (X) prepared so as to satisfy the above conditions is applied to the surface of the zinc-based plated steel sheet and obtained by heating and drying.
- the phosphoric acid compound (B) is composed of an inorganic phosphoric acid compound and an organic phosphoric acid compound.
- the above (B in / B og ) of the P-converted solid content mass (B in ) and the P-converted solid content mass (B og ) of the organophosphate compound is 0.1 to 1.5 ( A zinc-based plated steel sheet with a surface treatment film according to 1).
- At least one of the first and second surface treatment liquids (X, Y) contains at least one of a hydroxycarboxylic acid (E), a vanadic acid compound (F), and a nickel compound (G).
- E hydroxycarboxylic acid
- F vanadic acid compound
- G nickel compound
- the fluororesin emulsion (H) is contained in at least one of the first and second surface treatment liquids (X, Y), and the following (III), (IV), or (III) and (IV)
- the zinc-based plated steel sheet with the surface-treated film of the present invention and the zinc-based plated steel sheet with the surface-treated film obtained by the production method of the present invention are (1) after being subjected to severe ironing such as continuous high-speed press forming. Excellent blackening resistance, (2) Excellent flake-like plating peelability after severe ironing such as continuous high-speed press molding, and (3) Suppressing the adhesion dependency of blackening resistance .
- FIG. 1A shows the surface of a second film formed by heating and drying a second surface treatment liquid (Y) containing a fluororesin emulsion having an MFT of 40 ° C. at 100 ° C.
- FIG. 1B shows the surface of the second film formed by heating and drying a second surface treatment liquid (Y) containing a fluororesin emulsion having an MFT of 40 ° C. at 30 ° C.
- the zinc-based plated steel sheet used as a base is not particularly limited as long as it is a steel sheet containing zinc in the plating layer, but is not limited, but a hot-dip galvanized steel sheet (GI) or an alloyed alloy thereof.
- GI hot-dip galvanized steel sheet
- Galvanized steel sheet such as hot dip galvanized steel sheet (GA), electrogalvanized steel sheet (EG), Zn—Ni plated steel sheet, Zn—Al—Mg plated steel sheet (for example, Zn-6 mass% Al-3 mass% Mg alloy plated steel sheet) Zn-11 mass% Al-3 mass% Mg alloy plated steel sheet), Zn-Al plated steel sheet (for example, Zn-5 mass% Al alloy plated steel sheet, Zn-55 mass% Al alloy plated steel sheet), etc. Is possible.
- GA hot dip galvanized steel sheet
- EG electrogalvanized steel sheet
- Zn—Ni plated steel sheet Zn—Ni plated steel sheet
- Zn—Al—Mg plated steel sheet for example, Zn-6 mass% Al-3 mass% Mg alloy plated steel sheet
- Zn-11 mass% Al-3 mass% Mg alloy plated steel sheet Zn-Al plated steel sheet
- Zn-Al plated steel sheet for example, Zn-5 mass% Al alloy plated steel
- the zinc plating layer contains one or more kinds of nickel, cobalt, manganese, iron, molybdenum, tungsten, titanium, chromium, aluminum, magnesium, lead, antimony, tin, copper as a small amount of different metal elements or impurities May be. Also, two or more of the same or different galvanized layers may be plated.
- the first and second surface treatment liquids (X, Y) include a zirconium carbonate compound (A), a phosphoric acid compound (B), a tetraalkoxysilane (C), and a silane coupling agent having an epoxy group (D ) And water, and if necessary, at least one of hydroxycarboxylic acid (E), vanadic acid compound (F), nickel compound (G), and fluororesin emulsion (H). You can also.
- the first and second surface treatment liquids (X, Y) contain a zirconium carbonate compound (A).
- A zirconium carbonate compound
- the steel plate which is excellent in darkening resistance, flake-like plating peelability, and corrosion resistance can be obtained even if it press-molds.
- the first and second surface treatment liquids (X, Y) contain a phosphoric acid compound (B).
- the phosphoric acid compound in the first surface treatment liquid (X) comes into contact with the zinc-based plating layer, the zinc is etched to generate a reaction layer made of zinc and a hardly soluble metal salt on the steel sheet surface.
- a zirconium phosphate is produced
- the phosphoric acid compound in the second surface treatment liquid (Y) comes into contact with the first film, it forms zirconium phosphate in the second film while forming a reaction layer with the first film.
- reaction layers and zirconium phosphate With these reaction layers and zirconium phosphate, it is possible to obtain a steel sheet that is excellent in blackening resistance, flake-like plating peelability, and corrosion resistance even when subjected to severe press molding. Further, the phosphoric acid compound is present in the surface treatment film in a state of being easily dissolved in water, so that zinc ions dissolved during corrosion are captured and insolubilized, so that it is possible to improve ordinary flat surface corrosion resistance. .
- the phosphoric acid compound (B) is not particularly limited as long as it is soluble in the first and second surface treatment liquids (X, Y), and includes at least one selected from an inorganic phosphoric acid compound and an organic phosphoric acid compound.
- inorganic phosphate compounds include phosphoric acid, primary phosphate, secondary phosphate, tertiary phosphate, pyrophosphate, pyrophosphate, condensed polyphosphate such as tripolyphosphate, tripolyphosphate, Phosphorous acid, phosphite, hypophosphorous acid, hypophosphite and the like can be used.
- the ratio (B 2 / A 2 ) needs to be 0.05 to 0.46, preferably 0.08 to 0.30, more preferably 0.10 to 0.20. preferable.
- the solid content ratio (B 1 / A 1 ) of (I) is more than 0.30 and 0.46 or less, the solid content ratio (B 2 / A 2 ) satisfies the following formula (a): There is a need to.
- Inorganic phosphate compounds tend to form metal salts with zinc and zirconium.
- organophosphate compounds are excellent in liquid stability (having the effect of chelating zinc that elutes in a small amount from the surface of the zinc-based plating layer into the surface treatment solution and preventing the formation of precipitates), so use both in combination. Is preferred.
- the solid mass of P in terms of inorganic phosphate compound (B in) the ratio of the solid content of P in terms of the organic phosphoric acid compound (B og) (B in / B og) 0.1 to 1.5 is preferable, and 0.3 to 1.3 is more preferable.
- the first and second surface treatment liquids (X, Y) contain tetraalkoxysilane (C).
- Tetraalkoxysilane is a Si compound that is much denser than colloidal silica, and when dissolved in water, it hydrolyzes to produce silanol groups.
- This silanol group is three-dimensionally cross-linked with a silane coupling agent (D) having an epoxy group, which will be described later, and a zirconium carbonate compound (A), and is a very dense surface-treated film excellent in adhesion to a zinc-based plating layer. Is obtained. Therefore, it contributes to the improvement of the corrosion resistance of the flat portion, the blackening resistance and the water stain resistance, and further to the blackening resistance and the corrosion resistance after press molding.
- the tetraalkoxysilane (C) is not particularly limited as long as it contains four lower alkoxyl groups (for example, methoxy group, ethoxy group, propoxy group) as hydrolyzable groups in one molecule. All or some of the lower alkoxyl groups may be the same or all different.
- Examples of the tetraalkoxysilane (C) include tetramethoxysilane, tetraethoxysilane, and tetrapropoxysilane, and one or more of these can be used. Of these, tetraethoxysilane and / or tetramethoxysilane are preferably used from the viewpoint of obtaining the above effects more sufficiently.
- the hydroxycarboxylic acid (E) is considered to make the three-dimensional cross-linking structure of the tetraalkoxysilane (C), the silane coupling agent (D) having an epoxy group and the zirconium carbonate compound (A) more dense, so that In addition to partial corrosion resistance, blackening resistance, and water stain resistance, it is possible to further improve flaky plating peel resistance after severe press molding.
- (E 1 / A 1 ) is less than 0.05, it is preferable to apply and dry within 3 days after the preparation of the surface treatment liquid (X).
- the surface treatment liquid (X) can be used stably for 1 month or more.
- the (E 1 / A 1) exceeds 0.87, that the inclusion of Zr water stabilizing excess of the amount required for an amount of hydroxy carboxylic acids in the surface treatment solution (E 1) Therefore, many components effective for stabilizing the aqueous solution of Zr remain in the film even after the film is formed. Therefore, the surface treatment film-forming property is inferior, and the water-stain resistance may be lowered.
- the ratio (E 2 ) between the solid content mass (E 2 ) of the hydroxycarboxylic acid (E) and the solid content mass (A 2 ) of the zirconium carbonate compound (A) in terms of Zr. 2 / A 2 ) is preferably 0.05 to 0.87, more preferably 0.15 to 0.40. If (E 2 / A 2 ) is 0.05 or more, the (B 2 / A 2 ) defined in the present invention exceeds 0.05 while maintaining the liquid stability of the surface treatment liquid (Y). An amount of the phosphoric acid compound (B) of 46 or less can be blended.
- the first and second surface treatment liquids (X, Y) may contain a vanadic acid compound (F). Since the vanadic acid compound exists in a state that is easily dissolved in water throughout the entire film and acts as an inhibitor during zinc corrosion, a steel sheet having excellent corrosion resistance can be obtained. Examples of the vanadic acid compound include ammonium metavanadate, sodium metavanadate, and vanadium acetylacetonate, and one or more of these can be used.
- the ratio of the solid mass in terms of V of the vanadic acid compound (F) to the solid mass in terms of Zr of the zirconium carbonate compound (A) (F / A) is preferably 0.02 to 0.30, more preferably 0.03 to 0.20.
- the mass ratio is 0.02 or more, the flat surface corrosion resistance and the corrosion resistance after press molding do not decrease, and when it is 0.30 or less, the water resistance and blackening resistance may decrease. Absent.
- the first and second surface treatment liquids (X, Y) may contain a nickel compound (G).
- Nickel compound (G) exists as an ion in the surface treatment solution, and when it comes into contact with zinc, a part of the nickel compound is deposited on the surface of zinc due to an ionization tendency (in this case, Zn is base and Ni is noble).
- Zn is base and Ni is noble.
- the zinc surface is modified by concentration on the surface of zinc, and as a result, blackening of zinc is prevented.
- the nickel compound include nickel nitrate, nickel sulfate, nickel carbonate, nickel chloride, and nickel phosphate, and one or more of these can be used.
- the ratio (G / A) between the Ni solid mass of the nickel compound (G) and the Zr solid mass of the zirconium carbonate compound (A). ) Is preferably 0.02 to 0.16, more preferably 0.03 to 0.08.
- the mass ratio is 0.02 or more, the blackening resistance does not decrease, and when it is 0.16 or less, the planar portion corrosion resistance and the corrosion resistance after press molding do not decrease.
- At least one of the first and second surface treatment liquids (X, Y) may contain a fluororesin emulsion (H).
- the surface treatment film obtained by applying the surface treatment liquid to which the fluororesin emulsion (H) has been added and heating and drying is applied to the oil because the fluororesin emulsion wets and spreads and the surface of the film is reduced.
- the spread of wetting is suppressed and the resistance to wetting and spreading of oil is improved. Therefore, when this steel plate is used for a motor case, the lubricating oil hardly leaks out from the bearing portion of the motor, the lubricating oil is appropriately held in the bearing portion, and the vibration and noise of the motor can be suppressed.
- the fluororesin emulsion (H) is a homopolymer of a fluorinated acrylate monomer or a copolymer of a fluorinated acrylate monomer and an ethylene monomer such as ethylene, styrene, acrylic acid, methacrylic acid or methacrylic acid ester
- an ethylene monomer such as ethylene, styrene, acrylic acid, methacrylic acid or methacrylic acid ester
- the solid content mass (H 1 ) of the fluororesin emulsion (H) and the total solid mass of the first surface treatment liquid (X) ( X 1 ) ratio (H 1 / X 1 ) needs to be 0.001 to 0.100, preferably 0.003 to 0.070.
- the second surface-treatment liquid (Y) contains a fluorine resin emulsion (H), solid mass of fluorine resin emulsion (H) and (H 2)
- a second surface-treatment liquid of (Y) total The ratio (H 2 / Y 2 ) to the solid mass (Y 2 ) needs to be 0.001 to 0.100, preferably 0.003 to 0.070. When these mass ratios are less than 0.001, the effect of suppressing the wetting spread of oil is low, and when the mass ratio exceeds 0.100, the effect of suppressing the wetting spread of oil is sufficient. However, since the organic component derived from the resin is excessive, the darkening resistance after press molding is lowered.
- the first surface treatment liquid (X) contains the fluororesin emulsion (H)
- the second surface treatment liquid (Y) is applied on the first film
- the first film is the second film. Since the surface treatment liquid (Y) may be repelled and cannot be applied, the mass ratio is set to 0.100 or less.
- the fluororesin emulsion spreads out on the surface of the film formed by heating and drying the surface treatment liquid (X or Y) at a temperature equal to or higher than the MFT of the contained fluorinated resin emulsion (H).
- the surface of the coating formed by heating and drying the surface treatment liquid (X or Y) at a temperature lower than the MFT of the contained fluororesin emulsion (H) makes it difficult for the fluororesin emulsion to wet and spread. Is insufficient. For this reason, oil wet spreadability cannot be obtained sufficiently.
- the fluororesin is contained only in the first film, sufficient oil-wetting spreadability can be obtained.
- the first and second surface treatment liquids (X, Y) can be obtained by mixing the above-described components in water such as deionized water or distilled water. What is necessary is just to select suitably the solid content ratio of 1st and 2nd surface treatment liquid (X, Y).
- the pH of the first and second surface treatment liquids (X, Y) is not particularly limited, but when adjusting the pH, ammonia or a salt thereof, the hydroxycarboxylic acid described above, the phosphoric acid compound described above Any one or more of these may be used as appropriate.
- first and second surface treatment liquids (X, Y) For the first and second surface treatment liquids (X, Y), alcohol, ketone, cellosolve, amine-based water-soluble solvent, antifoaming agent, antibacterial and antifungal agent, colorant, uniform coating as necessary A wettability improver, a surfactant and the like may be added. However, it is important to add them to such an extent that the quality obtained in the present invention is not impaired, and the addition amount is preferably less than 5% by mass based on the total solid content of the surface treatment liquid. It is preferable that the first and second surface treatment liquids (X, Y) do not contain solids other than those described above.
- compositions of the first and second surface treatment liquids (X, Y) are close to each other, such an aqueous second surface treatment liquid (Y) is applied after the first film is formed. Even so, there is no adverse effect of the components of the first film eluting into the second film.
- the first surface treatment liquid (X) is applied to the surface of the zinc-based plated steel sheet, dried by heating, and applied to the surface of the zinc-plated steel sheet.
- a step of forming a first coating, a step of applying the second surface treatment liquid (Y) to the surface of the first coating, heating and drying, and forming a second coating on the surface of the first coating; Have.
- the total adhesion amount of the first and second films is 0.2 to 2.0 g / m 2 per side. If the total adhesion amount is less than 0.2 g / m 2 , the flaky plating peel resistance after severe press molding cannot be sufficiently obtained. On the other hand, if it exceeds 2.0 g / m 2 , blackening resistance during press molding is not obtained. , Blackening resistance and water stain resistance are reduced.
- Adhesion amount of the first coating is preferably in the per side 0.1 ⁇ 1.5g / m 2, it is preferable that the deposition amount of the second coating also per one surface 0.1 ⁇ 1.5g / m 2.
- the adhesion amount of the first film is 0.1 g / m 2 or more, a reaction layer composed of zinc and a hardly soluble metal salt can be sufficiently formed on the steel sheet surface, and the flake-like plating peel resistance is further improved.
- 1.5 g / m 2 or less the amount of phosphoric acid does not increase and blackening resistance does not decrease.
- the barrier property is sufficient, blackening, further improved water stain resistance, in the case of 1.5 g / m 2 or less, the whole The amount of phosphoric acid does not increase and blackening resistance does not decrease.
- an optimum method may be selected as appropriate depending on the shape of the zinc-based plated steel sheet to be treated, and a roll coating method, a bar coating method, Examples of the method include a dipping method and a spray coating method. It is also possible to adjust the coating amount, make the appearance uniform, and make the film thickness uniform by air knife method or roll drawing method after coating.
- a dryer, a hot air furnace, a high frequency induction heating furnace, an infrared furnace, or the like can be used.
- the heating temperature is not particularly limited, but is preferably 50 to 250 ° C., more preferably 60 to 200 ° C., and particularly preferably 60 to 180 ° C. in terms of peak metal temperature (PMT). If it is 250 degrees C or less, a crack does not enter in a surface treatment film and a plane part corrosion resistance does not fall. On the other hand, if it is 50 degreeC or more, since the coupling
- the heating time optimum conditions are appropriately selected depending on the type of zinc-based plated steel sheet to be used, and from the viewpoint of productivity and the like, 0.1 to 60 seconds are preferable, and 1 to 30 seconds are more preferable.
- the galvanized steel sheet may be subjected to a pretreatment for the purpose of removing oil and dirt on the surface of the galvanized steel sheet.
- Zinc-based plated steel sheets are often coated with rust-preventive oil for the purpose of rust-prevention, and even when not coated with rust-preventive oil, there are oil and dirt attached during work.
- the pretreatment step is not particularly necessary.
- the pretreatment method is not particularly limited, and examples thereof include hot water washing, solvent washing, and alkaline degreasing washing.
- Test plate Various zinc-based plated steel sheets shown in Table 1 were used as test plates. In addition, a zinc-type plating layer is formed in both surfaces of a steel plate, and the adhesion amount in Table 1 means the adhesion amount of the zinc plating layer per one surface.
- ⁇ - Darkening is adhered to the surface of the sample at 5% or less immediately after pressing, and the darkening remains on the steel plate surface even after a long time.
- ⁇ Darkening adheres to the sample surface in an area ratio of more than 5% and 15% or less, and the darkening remains on the steel plate surface even after a long time.
- X Darkening adheres to the sample surface in an area ratio of more than 15%, and the darkening remains on the steel plate surface over time.
- the evaluation criteria are as follows. (Evaluation criteria) A: Bleeding spread height of less than 0.5 cm B: Bleeding spread height of 0.5 cm or more and less than 5 cm B: Bleeding spread height of 1.5 cm or more and less than 3.0 cm ⁇ : Bleeding spread height of 3.0 cm or more 4 Less than 5 cm x: Spread spread height 4.5 cm or more
- Examples of the invention containing hydroxycarboxylic acid (E), vanadic acid compound (F), and nickel compound (G) are flat plate corrosion resistance, blackening resistance and water stain resistance, blackening resistance, flake-like plating peel resistance, And it was excellent in all the corrosion resistance after molding. Moreover, the invention example containing a fluororesin emulsion (H) was excellent in oil-wetting spreadability.
- the present invention is useful when a zinc-plated steel sheet with a surface treatment film is subjected to continuous high-speed press forming, such as for parts of motor cases.
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Abstract
Description
(1)亜鉛系めっき鋼板と、
該亜鉛系めっき鋼板上の第1皮膜と、該第1皮膜上の第2皮膜とを含む表面処理皮膜と、
を有する表面処理皮膜付き亜鉛系めっき鋼板であって、
前記第1皮膜は、炭酸ジルコニウム化合物(A)と、リン酸化合物(B)と、テトラアルコキシシラン(C)と、エポキシ基を有するシランカップリング剤(D)とを含有し、下記(I)の条件を満足するように調製された第1の表面処理液(X)を前記亜鉛系めっき鋼板の表面に塗布し、加熱乾燥して得たものであり、
前記第2皮膜は、炭酸ジルコニウム化合物(A)と、リン酸化合物(B)と、テトラアルコキシシラン(C)と、エポキシ基を有するシランカップリング剤(D)とを含有し、下記(II)の条件を満足するように調製された第2の表面処理液(Y)を前記第1皮膜の表面に塗布し、加熱乾燥して得たものであり、
前記第1および第2皮膜の合計付着量が、片面当たり0.2~2.0g/m2であることを特徴とする表面処理皮膜付き亜鉛系めっき鋼板。
(I)前記第1の表面処理液(X)中の、前記リン酸化合物(B)のP換算の固形分質量(B1)と、前記炭酸ジルコニウム化合物(A)のZr換算の固形分質量(A1)との比(B1/A1)が0.30超え2.20以下
(II)前記第2の表面処理液(Y)中の、前記リン酸化合物(B)のP換算の固形分質量(B2)と、前記炭酸ジルコニウム化合物(A)のZr換算の固形分質量(A2)との比(B2/A2)が0.05超え0.46以下、かつ、前記(I)の固形分比(B1/A1)が0.30超え0.46以下の場合には、前記固形分比(B2/A2)が次式(a)を満足する。
(B1/A1)>(B2/A2) ・・・式(a)
(III)前記第1の表面処理液(X)に前記フッ素樹脂エマルション(H)を含む場合、該フッ素樹脂エマルション(H)の固形分質量と、前記第1の表面処理液(X)の全固形質量との比(H1/X1)が0.001~0.100
(IV)前記第2の表面処理液(Y)に前記フッ素樹脂エマルション(H)を含む場合、該フッ素樹脂エマルション(H)の固形分質量と、前記第2の表面処理液(Y)の全固形質量との比(H2/Y2)が0.001~0.100
上記(1)~(4)のいずれか1項中の第2の表面処理液(Y)を前記第1皮膜の表面に塗布し、加熱乾燥して、前記第1皮膜の表面に第2皮膜を形成する工程と、
を有し、前記第1および第2皮膜からなる表面処理皮膜の合計付着量を、片面当たり0.2~2.0g/m2とすることを特徴とする表面処理皮膜付き亜鉛系めっき鋼板の製造方法。
本発明において、ベースとなる亜鉛系めっき鋼板としては、そのめっき層中に亜鉛を含有する鋼板であればよく、特に制限はないが、溶融亜鉛めっき鋼板(GI)またはこれを合金化した合金化溶融亜鉛めっき鋼板(GA)、電気亜鉛めっき鋼板(EG)等の亜鉛めっき鋼板、Zn−Niめっき鋼板、Zn−Al−Mgめっき鋼板(例えばZn−6質量%Al−3質量%Mg合金めっき鋼板、Zn−11質量%Al−3質量%Mg合金めっき鋼板)、Zn−Alめっき鋼板(例えば、Zn−5質量%Al合金めっき鋼板、Zn−55質量%Al合金めっき鋼板)などを用いることが可能である。
本発明の表面処理皮膜付き亜鉛系めっき鋼板は、前記亜鉛系めっき鋼板と、該亜鉛系めっき鋼板の少なくとも片面に形成された表面処理皮膜とを有する。表面処理皮膜は、前記亜鉛系めっき鋼板上の第1皮膜と、該第1皮膜上の第2皮膜とを含む。第1皮膜は、後述の第1の表面処理液(X)を亜鉛系めっき鋼板の表面に塗布し、加熱乾燥して得たものである。第2皮膜は、後述の第2の表面処理液(Y)を前記第1皮膜の表面に塗布し、加熱乾燥して得たものである。
第1および第2の表面処理液(X,Y)は、炭酸ジルコニウム化合物(A)と、リン酸化合物(B)と、テトラアルコキシシラン(C)と、エポキシ基を有するシランカップリング剤(D)と、水とを含有し、さらに必要に応じて、ヒドロキシカルボン酸(E)、バナジン酸化合物(F)、ニッケル化合物(G)、およびフッ素樹脂エマルション(H)の少なくとも1つを含有させることもできる。
(B1/A1)>(B2/A2) ・・・式(a)
(B2/A2)が0.46を超えた場合、または、式(a)を満たさない場合には、表面処理皮膜を2層にした効果を得ることができず、すなわち、耐黒変性が低下し、耐黒変性の付着量依存性が大きくなる。(B2/A2)が0.05以下である場合は、リン酸化合物(B)が不足することによって第1皮膜との反応性が低下すること、およびZrが過剰となることによって、第1皮膜との密着性が劣りかつ皮膜が脆くなるため、厳しいプレス成形後の耐フレーク状めっき剥離性、平板部耐食性、プレス成形後の耐食性を十分に得ることができない。
本発明の表面処理皮膜付き亜鉛系めっき鋼板の製造方法は、上記第1の表面処理液(X)を亜鉛系めっき鋼板の表面に塗布し、加熱乾燥して、前記亜鉛系めっき鋼板の表面に第1皮膜を形成する工程と、上記第2の表面処理液(Y)を前記第1皮膜の表面に塗布し、加熱乾燥して、前記第1皮膜の表面に第2皮膜を形成する工程と、を有する。
表1に示す各種亜鉛系めっき鋼板を供試板として使用した。なお、亜鉛系めっき層は鋼板の両面に形成され、表1中の付着量は片面当たりの亜鉛めっき層の付着量を意味する。
上記の供試板の表面を、日本パーカライジング(株)製パルクリーンN364Sを用いて処理し、表面の油分や汚れを取り除いた。次に、水道水で水洗して供試板表面が水で100%濡れることを確認した後、さらに純水(脱イオン水)を流しかけ、100℃雰囲気のオーブンで水分を乾燥した。
各成分を表2に示す組成(固形分質量比)にて水中で混合し、第1の表面処理液(X)および第2の表面処理液(Y)を得た。これらの表面処理液は、調製後、すぐに試験に使用した。
A1:炭酸ジルコニウムナトリウム
A2:炭酸ジルコニウムアンモニウム
B1:リン酸(H3PO4)
B2:リン酸二水素アンモニウム(NH4(H2PO4))
B3:ジホスホン酸(C2H8P2O7)
C1:テトラメトキシシラン
C2:テトラエトキシシラン
D1:3−グリシドキシプロピルトリエトキシシラン
D2:3−グリシドキシプロピルトリメトキシシラン
E1:リンゴ酸
E2:酒石酸
E3:クエン酸
F1:メタバナジン酸ナトリウム(NaVO3)
F2:メタバナジン酸アンモニウム(NH4VO3)
G1:硝酸ニッケル六水和物(Ni(NO3)2・6H2O)
G2:硫酸ニッケル六水和物(NiSO4・6H2O)
フッ素化アルキル基含有アクリレートとアクリル酸アルキルエステル共重合体として、最低造膜温度(MFT)が以下のものを用いた。
H1:MFT 5℃
H2:MFT 14℃
H3:MFT 33℃
H4:MFT 55℃
表1に示す各鋼板(鋼板の番号を表2の「鋼板」欄に示す)に対して前処理を行った各種供試板に、表2の各種第1の表面処理液(X)をバーコーターで塗布し、その後、水洗することなく、そのままオーブンに入れて、表2の「PMT」欄に示す最高到達板温(PMT:Peak Metal Temperature)で乾燥させ、表2に示す付着量(片面あたり)の第1皮膜を両面に形成した。次いで、第1皮膜の表面に、表2の各種第2の表面処理液(Y)をバーコーターで塗布し、その後、水洗することなく、そのままオーブンに入れて、表2の「PMT」欄に示す最高到達板温で乾燥させ、表2に示す付着量(片面あたり)の第2皮膜を両面に形成した。
得られた表面処理皮膜付き亜鉛系めっき鋼板(以下、単に「サンプル」という。)に対して、以下の(5−1)~(5−9)の評価を行った結果を、表2に併せて示す。
各サンプルに対して、プレスを行わず平板の状態で、JIS−Z−2371−2000に準拠する塩水噴霧試験(SST)を実施した。120時間後の白錆発生面積率で平板部耐食性を評価した。評価基準は以下のとおりである。
(評価基準)
◎ :白錆面積率5%未満
○ :白錆面積率5%以上10%未満
○−:白錆面積率10%以上25%未満
△ :白錆面積率25%以上50%未満
× :白錆面積率50%以上100%以下
表面処理皮膜の膜厚が均一な各サンプルについて、プレスを行わず平板の状態で、80℃,98%RH環境下24時間保持前後のサンプル表面の色差△L*(JIS−Z−8729−2004に規定するL*、a*、b*表示系におけるCIE1976明度L*の差)の測定と目視観察にて、耐黒変性を評価した。評価基準は以下のとおりである。
(評価基準)
◎ :−2.5<△L*≦1 かつ、ムラが無い均一な外観
○ :−3<△L*≦−2.5 かつ、ムラが無い均一な外観
○−:−3.5<△L*≦−3 かつ、ムラが無い均一な外観
△ :−4<△L*≦−3.5 かつ、ムラが無い均一な外観
× :△L*≦−4 または、外観ムラあり
各サンプルに対して、第1皮膜、第2皮膜ともに表2の付着量の1.2倍の第2サンプルを準備した。各サンプルと、各サンプルに対応する第2サンプルの両方について、平板の状態で、(5−2)に記載の色差△L*の測定を行った。以下の式から、Δ(△L*)を求め、耐黒変性の付着量依存性を評価した。
Δ(△L*)=(サンプルにおける△L*)−(第2サンプルにおける△L*)
(評価基準)
◎ :−0.5<Δ(△L*)≦1.0
○ :−1.0<Δ(△L*)≦−0.5
○−:−1.5<Δ(△L*)≦−1.0
△ :−2.0<Δ(△L*)≦−1.5
× :Δ(△L*)≦−2.0
各サンプルについて、プレスを行わず平板の状態で、サンプル表面に脱イオン水を300μl滴下し、炉内温度100℃の熱風オーブンに10分間投入し、オーブンから取り出した後の水滴滴下跡を目視観察して、耐水しみ性を評価した。評価基準は以下のとおりである。
(評価基準)
◎ :水滴境界が見る角度によらず確認されない
○ :水滴境界が見る角度によって若干確認される
○−:水滴境界が見る角度によらず若干確認される
△ :水滴境界が見る角度によらずはっきり確認される
× :水滴境界が滴下範囲を超えてはっきり確認される
各サンプルに速乾性のプレス油(日本工作油株式会社製:無洗浄プレス工作油G−6231F)を塗油した状態で、以下のプレス条件の多段絞り成形を行い、金型に付着する汚れを拭き取ることなく10サンプル連続で成形した後、10個目のサンプル表面に付着した黒ずみの程度を目視で観察し、耐黒ずみ性を評価した。評価基準は以下のとおりである。
(プレス条件)
成形速度450mm/秒、ブランク径φ90mm
1段目:ポンチ径Φ49mm、ポンチとダイスのクリアランス1.0mm
2段目:ポンチ径Φ39mm、ポンチとダイスのクリアランス0.8mm
3段目:ポンチ径Φ32mm、ポンチとダイスのクリアランス0.8mm
4段目:ポンチ径Φ27.5mm、ポンチとダイスのクリアランス0.8mm
5段目:ポンチ径Φ24.4mm、ポンチとダイスのクリアランス0.8mm
(評価基準)
◎ :プレス直後でも黒ずみがサンプル表面に付着していない。
○ :プレス直後は黒ずみがサンプル表面に面積率で5%以下付着しているが、時間とともに黒ずみが鋼板表面から流れてほとんど確認できなくなる。
○−:プレス直後に黒ずみがサンプル表面に面積率で5%以下付着しており、時間がたっても黒ずみが鋼板表面に残ったままである。
△ :黒ずみがサンプル表面に面積率で5%超、15%以下付着して、時間がたっても黒ずみが鋼板表面に残ったままである。
× :黒ずみがサンプル表面に面積率で15%超付着して、時間がたっても黒ずみが鋼板表面に残ったままである。
各サンプルに速乾性のプレス油(日本工作油株式会社製:無洗浄プレス工作油G−6231F)を塗油した状態で、以下の引き抜き条件で、金型に付着する汚れや剥離カスを拭き取ることなく同じ箇所を3回連続で平面引き抜きした後、サンプル表面に付着しためっき剥離カスの程度をルーペで拡大して目視観察し、耐めっき剥離性を評価した。評価基準は以下のとおりである。
(プレス条件)
ビード先端径0.5mm、押しつけ荷重200kgf、引き抜き速度16.7mm/秒、引き抜き距離100mm
(めっき剥離カスの評価基準)
◎ :めっき剥離カスが金属光沢を有さず、量が微量で細かい粒状である。
○ :めっき剥離カスが金属光沢を有さず、細かい粒状である。
○−:めっき剥離カスが金属光沢を有し、細かい粒状である。
△ :めっき剥離カスが金属光沢を有し、鱗片屑状である。
× :めっき剥離カスが金属光沢を有し、量が多くカンナ屑状である。
上記「(5−5)耐黒ずみ性」に示した多段絞り成形を行ったサンプルに対して、速乾性のプレス油が乾いた後、各サンプルについてJIS−Z−2371−2000に準拠する塩水噴霧試験を実施した。16時間後の白錆発生面積率で、連続高速プレス成形後耐食性を評価した。評価基準は以下のとおりである。
(評価基準)
◎ :白錆面積率5%未満
○ :白錆面積率5%以上10%未満
○−:白錆面積率10%以上25%未満
△ :白錆面積率25%以上50%未満
× :白錆面積率50%以上100%以下
電子式万能試験機(YONEKURA(株)製「CATY」)を用いて、各サンプルを延伸速度10mm/min、延伸率20%で延伸した。40℃での動粘度が51~69mm2/s、100℃での動粘度が11.1~14.9mm2/sの軸受け用油(NOKクリューバー(株)製「ALL TIME J 652」)を容器に入れ、鉛直に立てたサンプルの下端部を容器内の軸受け用油に浸した状態で85℃環境下3日間静置し、軸受け用油のしみ拡がり高さを測定した。評価基準は、以下のとおりである。
(評価基準)
◎ :滲み拡がり高さ0.5cm未満
○ :滲み拡がり高さ0.5cm以上1、5cm未満
○−:滲み拡がり高さ1.5cm以上3.0cm未満
△ :滲み拡がり高さ3.0cm以上4.5cm未満
× :滲み拡がり高さ4.5cm以上
電子式万能試験機(YONEKURA(株)製「CATY」)を用いて、各サンプルを延伸速度10mm/min、延伸率20%で延伸した。その後、各サンプルを85℃に加温した状態で、上記(5−8)に記載の軸受け用油を、サンプル表面に滴下し、滴下後85℃環境下3日間静置した。その後、各サンプルの接触角を固液界面解析装置(協和界面科学(株)製「Drop Master500」)により測定した。評価基準は、以下のとおりである。
(評価基準)
◎ :接触角40°以上
○ :接触角30°以上40°未満
○−:接触角20°以上30°未満
△ :接触角10°以上20°未満
× :接触角10°未満
表2に示すように、本発明例では、(5−5)連続高速プレス成形等の過酷なしごき加工を施した後の耐黒ずみ性、(5−6)連続高速プレス成形等の過酷なしごき加工を施した後の耐フレーク状めっき剥離性、(5−3)耐黒変性の付着量依存性がいずれも優れる表面処理皮膜付き亜鉛系めっき鋼板を得ることができた。これに対し、比較例では、上記(5−6)および(5−3)の少なくとも一方が優れなかった。
Claims (6)
- 亜鉛系めっき鋼板と、
該亜鉛系めっき鋼板上の第1皮膜と、該第1皮膜上の第2皮膜とを含む表面処理皮膜と、
を有する表面処理皮膜付き亜鉛系めっき鋼板であって、
前記第1皮膜は、炭酸ジルコニウム化合物(A)と、リン酸化合物(B)と、テトラアルコキシシラン(C)と、エポキシ基を有するシランカップリング剤(D)とを含有し、下記(I)の条件を満足するように調製された第1の表面処理液(X)を前記亜鉛系めっき鋼板の表面に塗布し、加熱乾燥して得たものであり、
前記第2皮膜は、炭酸ジルコニウム化合物(A)と、リン酸化合物(B)と、テトラアルコキシシラン(C)と、エポキシ基を有するシランカップリング剤(D)とを含有し、下記(II)の条件を満足するように調製された第2の表面処理液(Y)を前記第1皮膜の表面に塗布し、加熱乾燥して得たものであり、
前記第1および第2皮膜の合計付着量が、片面当たり0.2~2.0g/m2であることを特徴とする表面処理皮膜付き亜鉛系めっき鋼板。
(I)前記第1の表面処理液(X)中の、前記リン酸化合物(B)のP換算の固形分質量(B1)と、前記炭酸ジルコニウム化合物(A)のZr換算の固形分質量(A1)との比(B1/A1)が0.30超え2.20以下
(II)前記第2の表面処理液(Y)中の、前記リン酸化合物(B)のP換算の固形分質量(B2)と、前記炭酸ジルコニウム化合物(A)のZr換算の固形分質量(A2)との比(B2/A2)が0.05超え0.46以下、かつ、前記(I)の固形分比(B1/A1)が0.30超え0.46以下の場合には、前記固形分比(B2/A2)が次式(a)を満足する。
(B1/A1)>(B2/A2) ・・・式(a) - 前記第1および第2の表面処理液(X,Y)の少なくとも一方において、前記リン酸化合物(B)が、無機リン酸化合物および有機リン酸化合物からなり、前記無機リン酸化合物のP換算の固形分質量(Bin)と、前記有機リン酸化合物のP換算の固形分質量(Bog)との比(Bin/Bog)が0.1~1.5である請求項1に記載の表面処理皮膜付き亜鉛系めっき鋼板。
- 前記第1および第2の表面処理液(X,Y)の少なくとも一方が、ヒドロキシカルボン酸(E)、バナジン酸化合物(F)、およびニッケル化合物(G)の少なくとも1つを含有する請求項1または2に記載の表面処理皮膜付き亜鉛系めっき鋼板。
- 前記第1および第2の表面処理液(X,Y)の少なくとも一方にフッ素樹脂エマルション(H)を含有し、かつ下記(III)、(IV)、または、(III)および(IV)の条件を満たす請求項1~3のいずれか1項に記載の表面処理皮膜付き亜鉛系めっき鋼板。
(III)前記第1の表面処理液(X)に前記フッ素樹脂エマルション(H)を含む場合、該フッ素樹脂エマルション(H)の固形分質量と、前記第1の表面処理液(X)の全固形質量との比(H1/X1)が0.001~0.100
(IV)前記第2の表面処理液(Y)に前記フッ素樹脂エマルション(H)を含む場合、該フッ素樹脂エマルション(H)の固形分質量と、前記第2の表面処理液(Y)の全固形質量との比(H2/Y2)が0.001~0.100 - 前記第1皮膜の付着量が片面当たり0.1~1.5g/m2であり、前記第2皮膜の付着量が片面当たり0.1~1.5g/m2である請求項1~4のいずれか1項に記載の表面処理皮膜付き亜鉛系めっき鋼板。
- 請求項1~4のいずれか1項中の第1の表面処理液(X)を亜鉛系めっき鋼板の表面に塗布し、加熱乾燥して、前記亜鉛系めっき鋼板の表面に第1皮膜を形成する工程と、
請求項1~4のいずれか1項中の第2の表面処理液(Y)を前記第1皮膜の表面に塗布し、加熱乾燥して、前記第1皮膜の表面に第2皮膜を形成する工程と、
を有し、前記第1および第2皮膜からなる表面処理皮膜の合計付着量を、片面当たり0.2~2.0g/m2とすることを特徴とする表面処理皮膜付き亜鉛系めっき鋼板の製造方法。
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