WO2015080268A1 - 亜鉛-アルミニウム-マグネシウム合金めっき鋼板の表面処理方法 - Google Patents
亜鉛-アルミニウム-マグネシウム合金めっき鋼板の表面処理方法 Download PDFInfo
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- WO2015080268A1 WO2015080268A1 PCT/JP2014/081634 JP2014081634W WO2015080268A1 WO 2015080268 A1 WO2015080268 A1 WO 2015080268A1 JP 2014081634 W JP2014081634 W JP 2014081634W WO 2015080268 A1 WO2015080268 A1 WO 2015080268A1
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- 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
- 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
- C23C22/44—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 fluorides or complex fluorides
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C18/00—Alloys based on zinc
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C18/00—Alloys based on zinc
- C22C18/04—Alloys based on zinc with aluminium as the next major constituent
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- C—CHEMISTRY; METALLURGY
- C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
- C23C—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THE SURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTION; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL
- C23C2/00—Hot-dipping or immersion processes for applying the coating material in the molten state without affecting the shape; Apparatus therefor
- C23C2/04—Hot-dipping or immersion processes for applying the coating material in the molten state without affecting the shape; Apparatus therefor characterised by the coating material
- C23C2/06—Zinc or cadmium or alloys based thereon
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- C—CHEMISTRY; METALLURGY
- C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
- C23C—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THE SURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTION; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL
- C23C2/00—Hot-dipping or immersion processes for applying the coating material in the molten state without affecting the shape; Apparatus therefor
- C23C2/04—Hot-dipping or immersion processes for applying the coating material in the molten state without affecting the shape; Apparatus therefor characterised by the coating material
- C23C2/12—Aluminium or alloys based thereon
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- C—CHEMISTRY; METALLURGY
- C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
- C23C—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THE SURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTION; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL
- C23C2/00—Hot-dipping or immersion processes for applying the coating material in the molten state without affecting the shape; Apparatus therefor
- C23C2/26—After-treatment
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- C—CHEMISTRY; METALLURGY
- C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
- C23C—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THE SURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTION; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL
- C23C2/00—Hot-dipping or immersion processes for applying the coating material in the molten state without affecting the shape; Apparatus therefor
- C23C2/34—Hot-dipping or immersion processes for applying the coating material in the molten state without affecting the shape; Apparatus therefor characterised by the shape of the material to be treated
- C23C2/36—Elongated material
- C23C2/40—Plates; Strips
Definitions
- the present invention relates to a surface treatment method of a zinc-aluminum-magnesium alloy plated steel plate with a chromium-free metal surface treatment agent and a chemical conversion film-treated zinc-aluminum-magnesium alloy plated steel plate obtained by the surface treatment method.
- Metal materials such as galvanized steel sheet materials and aluminum materials are oxidized and corroded by atmospheric oxygen, moisture, ions contained in moisture, and the like.
- a method of preventing such corrosion there is a method of forming a chromate film by bringing a treatment liquid containing chromium such as chromate chromate and phosphate chromate into contact with the metal surface.
- the film formed by the chromate treatment has excellent corrosion resistance and adhesion to the coating film, but contains harmful hexavalent chromium in the treatment liquid, which takes time and cost for wastewater treatment. There's a problem.
- the film formed by the treatment contains hexavalent chromium, problems in terms of environment and safety have been pointed out.
- the metal surface treating agent of Patent Document 1 includes a vanadium compound (A), a metal compound (B) containing a metal selected from cobalt, nickel, zinc, magnesium, aluminum, calcium, strontium, barium and lithium, and optionally A chromium-free metal surface treating agent containing a metal compound (C) containing a metal selected from zirconium, titanium, molybdenum, tungsten, manganese, and cerium, and imparting excellent corrosion resistance, alkali resistance, and interlayer adhesion to a metal material is there.
- the metal surface treatment agent of Patent Document 2 is one or more of four groups selected from a Zr compound that releases zirconyl ions (ZrO 2+ ) in an aqueous solution and a Ti compound that releases titanyl ions (TiO 2+ ) in an aqueous solution.
- a Zr compound that releases zirconyl ions (ZrO 2+ ) in an aqueous solution and a Ti compound that releases titanyl ions (TiO 2+ ) in an aqueous solution.
- a metal surface treatment agent that has a high adhesion so that the resin coating film does not peel off even when the resin coating film formed after the formation of the chemical conversion film is subjected to severe molding such as deep drawing. It is a chromium-free metal surface treatment agent that can impart properties. Note that the metal surface treatment agents of Patent Documents 1 and 2 can both contain an aqueous resin that may be water-soluble or water-dispersible.
- Patent Document 3 since it was proposed in Patent Document 3, it has been known that a hot dip galvanized aluminum-magnesium plated steel sheet using a plating bath containing appropriate amounts of aluminum and magnesium in zinc is excellent in corrosion resistance.
- Patent Documents 1 and 2 are not necessarily sufficient in corrosion resistance, adhesion, and the like depending on the object to be treated and applications.
- the present invention provides a chromium-aluminum-magnesium alloy-plated steel sheet with good corrosion resistance, which can form a film having excellent corrosion resistance and high adhesion between the plated steel sheet and a resin film such as a paint film or a laminate film. It is an object of the present invention to provide a method of obtaining a chemical conversion film-treated zinc-aluminum-magnesium alloy plated steel sheet which is treated with a free metal surface treatment agent and has excellent corrosion resistance and adhesion to a resin film.
- the plating layer contains Al: 1.0 to 10% by mass, Mg: 1.0 to 10% by mass, the balance Zn and inevitable impurities.
- both an organic phosphorus compound and an inorganic phosphorus compound are contained, and furthermore, a high acid value aqueous acrylic resin and a specific amount of an oxazoline group-containing polymer are included, and the ratio of the inorganic component to the organic component is within a specific range.
- a method of treating the surface of a zinc-aluminum-magnesium alloy plated steel sheet with a metal surface treatment agent A step of forming a zinc-aluminum-magnesium alloy plating layer on the surface of the steel sheet; and a step of treating the surface of the plating layer with a metal surface treatment agent following the plating layer formation step, the zinc-aluminum
- the magnesium alloy plating layer is a plating layer containing Al: 1.0 to 10 mass%, Mg: 1.0 to 10 mass%, the balance Zn and inevitable impurities
- the surface of the zinc-aluminum-magnesium alloy-plated steel sheet having a pH of 3 to 6 is applied to the surface of the metal surface treatment agent. How to handle using.
- the zinc-aluminum-magnesium alloy plating layer contains Si: 0.001 to 2.0% by mass, Ti: 0.001 to 0.1% by mass, and B: 0.001 to 0.045% by mass.
- the surface of a zinc-aluminum-magnesium alloy plated steel sheet with good corrosion resistance is treated with a chromium-free metal surface treatment agent that can form a film having excellent corrosion resistance and high adhesion to the plated steel sheet and resin film.
- a method can be provided.
- the surface of a zinc-aluminum-magnesium alloy plated steel sheet (hereinafter sometimes referred to as “metal material”) is treated with a specific chromium-free metal surface treatment agent (hereinafter also referred to as “treatment agent”).
- a specific chromium-free metal surface treatment agent hereinafter also referred to as “treatment agent”.
- the surface treatment with the chromium-free metal surface treatment agent is also referred to as “chemical conversion treatment”.
- the plated steel sheet of the present invention is a zinc-aluminum-magnesium alloy plated steel sheet manufactured using a molten Zn—Al—Mg plating bath.
- the metal surface treatment agent of the present invention contains a fluorine compound, a reaction layer containing Al and Mg fluoride is formed on the plating layer surface of the plated steel sheet by chemical conversion treatment, and the chemical conversion film and the plating layer surface are formed. It is possible to increase the adhesive strength with.
- a known method can be used to form the zinc-aluminum-magnesium alloy plating layer on the surface of the steel sheet, but 1.0 to 10% by mass of aluminum, 1.0 to 10% by mass of magnesium, the balance Zn and It is preferably produced by a hot dipping method using an alloy plating bath containing inevitable impurities. Further, it is more preferable to add Ti, B, Ti—B alloy or Ti, B-containing compound to the plating bath in order to suppress the formation and growth of Zn 11 Mg 2 phase which adversely affects the appearance and corrosion resistance.
- the addition amount of these metals or compounds is preferably 0.001 to 0.1% by mass of Ti and 0.001 to 0.045% by mass of B in terms of metal with respect to the plating bath.
- the zinc-aluminum-magnesium alloy plated steel sheet in the present invention can be obtained by forming a zinc-aluminum-magnesium alloy plated layer on the surface of the steel sheet.
- This is a plating layer containing 0 to 10% by mass, Mg: 1.0 to 10% by mass, the balance Zn and inevitable impurities.
- the zinc-aluminum-magnesium alloy plating layer preferably contains 80 to 98% by mass of Zn.
- the zinc-aluminum-magnesium alloy plating layer is composed of Si: 0.001 to 2.0 mass%, Ti: 0.001 to 0.1 mass%, and B: 0.001 to 0.045 mass%. It is preferable that it further contains 1 type or 2 types or more.
- the vanadium compound (B) By containing the vanadium compound (B), a film having improved corrosion resistance can be formed, and by containing both the organic phosphorus compound (Da) and the inorganic phosphorus compound (Db), the corrosion resistance can be improved.
- Zirconyl ammonium sulfate, zirconyl nitrate, zirconyl ammonium nitrate, zirconyl formate, zirconyl acetate, zirconyl propionate, zirconyl butyrate, oxalic acid and zirconyl ion salts, malonic acid and zirconyl ion salts, succinic acid and zirconyl ion salts, oxy Examples include zirconium chloride. By being a compound having a zirconyl ([Zr O] 2+ ) structure, the crosslinkability during film formation is improved, and a film having good corrosion resistance can be formed.
- the content of the zirconium compound (A) containing a zirconyl group in the treating agent is preferably 0.01 to 10% by mass, more preferably 0.1 to 8% by mass, and 0.2 to 8%. More preferably, it is more preferably 0.5 to 5% by mass. If the content of the zirconium compound (A) containing a zirconyl group is 0.01% by mass or more, corrosion resistance can be sufficiently imparted, and if it is 10% by mass or less, the flexibility of the film becomes sufficient. Excellent processing adhesion.
- the vanadium compound (B) specifically includes metavanadate and its salt, vanadium oxide, vanadium trichloride, vanadium oxytrichloride, vanadium acetylacetonate, vanadium oxyacetylacetonate.
- metavanadate and its salt, vanadium oxide, vanadium oxytrichloride, vanadium alkoxide, and vanadium oxyalkoxide are preferable.
- the content of the vanadium compound (B) in the treating agent is preferably 0.01 to 5% by mass, more preferably 0.1 to 3% by mass. By containing 0.01 to 5% by mass of the vanadium compound (B), the corrosion resistance can be improved.
- titanium fluoro complex compound (C) used in the metal surface treating agent of the present invention examples include fluorotitanic acid and its salt. Since the titanium fluoro complex compound (C) contains fluorine, etching of the metal surface is likely to occur, so that a film having excellent corrosion resistance and high adhesion to the metal material is formed.
- the content of the titanium fluoro complex compound (C) in the treating agent is preferably 0.01 to 10% by mass, more preferably 0.1 to 8.5% by mass, and 0.3 to 7%. More preferably, it is mass%.
- the content of the titanium fluoro complex compound (C) is 0.01% by mass or more, sufficient corrosion resistance can be imparted, and when it is 10% by mass or less, excessive etching is prevented, and an inorganic phosphorus compound (Db The metal cations eluted with respect to ()) are prevented from becoming excessive, so that the corrosion resistance is excellent.
- the metal surface treating agent of the present invention can further improve the corrosion resistance by containing both an organic phosphorus compound (Da) and an inorganic phosphorus compound (Db) containing a phosphoric acid group and / or a phosphonic acid group. .
- organic phosphorus compounds (Da) examples include 1-hydroxyethylidene-1,1-diphosphonic acid, 2-phosphonobutane-1,2,4-tricarboxylic acid, ethylenediaminetetramethylenephosphonic acid, aminotrimethylenephosphonic acid, phenyl Examples thereof include phosphonic acids such as phosphonic acid and octylphosphonic acid, and salts thereof. A combination of these organophosphorus compounds can also be used. Of these, 1-hydroxyethylidene-1,1-diphosphonic acid, 2-phosphonobutane-1,2,4-tricarboxylic acid, and aminotrimethylenephosphonic acid are preferred.
- Examples of such inorganic phosphorus compounds (Db) include phosphoric acids such as phosphoric acid and phosphorous acid and salts thereof, and condensed phosphoric acids such as pyrophosphoric acid and tripolyphosphoric acid and salts thereof.
- phosphoric acids such as phosphoric acid and phosphorous acid and salts thereof
- condensed phosphoric acids such as pyrophosphoric acid and tripolyphosphoric acid and salts thereof.
- a cation for forming a salt of phosphoric acid and a salt of condensed phosphoric acid any one can be used as long as it forms a salt that is easily soluble in water and the aqueous solution can liberate phosphate ions. Sodium, potassium, ammonium, etc. are mentioned. A combination of these inorganic phosphorus compounds can also be used.
- a salt of phosphoric acid is preferable.
- “easily soluble in water” means that 1 g of the compound is dissolved in 10 ml of water at 25 ° C.
- dissolution refers to a state in which it is dissolved in a solvent and is uniform and a state in which it is finely dispersed. Specifically, it means a state in which precipitation does not occur when centrifugation is performed at 12,000 rpm for 30 minutes.
- the content of the organic phosphorus compound (Da) and the inorganic phosphorus compound (Db) is preferably 0.01 to 10% by mass, and preferably 0.1 to 8% by mass, as the content in the treatment agent. Is more preferably 0.3 to 6% by mass.
- the mass ratio in terms of phosphorus element means the ratio of the mass of phosphorus element contained in each of the organic phosphorus compound (Da) and the inorganic phosphorus compound (Db).
- the vanadium compound (B) can be stably dissolved in the treatment agent due to the chelating effect.
- the treatment agent contains the inorganic phosphorus compound (Db) in the above-described concentration range, it is possible to efficiently form a film having excellent corrosion resistance with the metal cation eluted by etching.
- the organic phosphorus compound (Da) and the inorganic phosphorus compound (Db) are present in the treatment agent at the above mass ratio, both corrosion resistance and water resistance can be achieved.
- the aqueous acrylic resin (E) used as the metal surface treating agent of the present invention has a plurality of carboxyl groups obtained by polymerizing monomers having an ethylenically unsaturated double bond, and has a solid content acid value of 300 mgKOH / g or more. It is a polymer.
- the mass average molecular weight is preferably 1,000 or more and 1,000,000 or less.
- the mass average molecular weight of the resin can be measured by gel permeation chromatography (GPC) using a polystyrene standard sample standard.
- the acid value and hydroxyl value of resin solid content in the present invention can be determined by a method based on JIS K 0070.
- Such aqueous acrylic resins include, as monomers, homopolymers obtained by radical polymerization of acrylic acid and methacrylic acid, and copolymers obtained by radical polymerization of these monomers and other ethylenically unsaturated monomers.
- a polymer can be used.
- other ethylenically unsaturated monomers include, for example, ethyl (meth) acrylates, alkyl (meth) acrylates such as butyl (meth) acrylate, 2-hydroxyethyl (meth) acrylate, 2-hydroxy And hydroxyalkyl (meth) acrylates such as propyl (meth) acrylate and 4-hydroxybutyl (meth) acrylate.
- the acid value of water-based acrylic resin (E) can be adjusted with the monomer composition used for superposition
- the aqueous acrylic resin (E) can be obtained by polymerizing the above monomer by a usual method.
- a water-based acrylic resin can be obtained by mixing a monomer mixture with a known polymerization initiator (for example, azobisisobutyronitrile), dropping into a Kolben containing a solvent heated to a polymerizable temperature and aging. it can.
- a known polymerization initiator for example, azobisisobutyronitrile
- the aqueous acrylic resin (E) is contained in a concentration of 100 to 30,000 ppm of resin solids in the treating agent. By making it contain in the said density
- the metal surface treating agent of the present invention further contains an oxazoline group-containing polymer (F) that is a curing agent that reacts with the aqueous acrylic resin (E) to form a crosslinked structure.
- the oxazoline group-containing polymer (F) as such a curing agent is an oxazoline group-containing polymer containing in the molecule at least two functional groups capable of reacting with the carboxyl group of the aqueous acrylic resin (E). .
- oxazoline group-containing polymer examples include 2-vinyl-2-oxazoline, 2-vinyl-4-methyl-2-oxazoline, 2-vinyl-5-methyl-2-oxazoline, 2-isopropenyl-2- A monomer comprising an addition-polymerizable oxazoline such as oxazoline, 2-isopropenyl-4-methyl-2-oxazoline, 2-isopropenyl-5-ethyl-2-oxazoline, and other polymerizable monomers used as necessary.
- An oxazoline group-containing polymer obtained by polymerizing the monomer composition can be exemplified.
- Epocross WS-700 (25% active ingredient, water-soluble type, oxazoline group-containing acrylic resin, manufactured by Nippon Shokubai Co., Ltd.
- Epocross WS-300 (10% active ingredient, water-soluble type, oxazoline) Group-containing acrylic resin, manufactured by Nippon Shokubai Co., Ltd.
- the curing agent oxazoline group-containing polymer (F) is contained in the treatment agent in a solid content concentration of 50 ppm to 5,000 ppm, and is a curing agent that forms a crosslinked structure with the aqueous acrylic resin (E).
- the pH of the metal surface treatment agent of the present invention is required to be 3-6.
- etching becomes insufficient, and the adhesion between the metal material and the chemical conversion film becomes insufficient.
- the pH is less than 3, the etching becomes excessive and the appearance (powder) of the steel sheet becomes poor.
- the poor powder property refers to a state in which the steel sheet after chemical conversion treatment has a powder-like appearance, and the film easily falls off by rubbing with a hand or a roll.
- the compound (Da), the inorganic phosphorus compound (Db), the aqueous acrylic resin (E), and the oxazoline group-containing polymer (F) that is a curing agent can be mixed in predetermined amounts.
- the solid content concentration of the chromium-free metal surface treatment agent of the present invention is preferably 0.1 to 20% by mass, and more preferably 1 to 15% by mass with respect to the treatment agent.
- the metal surface treatment agent of the present invention is a chromium-free metal surface treatment agent that substantially does not contain not only hexavalent chromium but also a compound containing trivalent chromium from the viewpoint of environment and safety. “Containing substantially no chromium-containing compound” means that the content of metallic chromium derived from the chromium compound in the metal surface treatment agent is less than 1 ppm.
- the metal surface treatment agent of the present invention contains a thickener, a leveling agent, a wettability improver, a surfactant, an antifoaming agent, a water-soluble alcohol, a cellosolve solvent, etc., as necessary. May be.
- the surface treatment (chemical conversion treatment) using the chromium-free metal surface treatment agent of the present invention can be performed as follows. There is no particular limitation on the pre-process of the chemical conversion treatment according to the present invention, but usually, before the chemical conversion treatment, a degreasing treatment with an alkaline degreasing solution is performed to remove oil and dirt adhering to the metal material. Accordingly, the surface is adjusted with acid, alkali, nickel compound, cobalt compound or the like. At this time, it is preferable to wash with water after the treatment so that the degreasing liquid or the like does not remain on the surface of the metal material.
- the surface treatment agent of the present invention is used on the surface of a zinc-aluminum-magnesium alloy-plated steel plate, roll coating method, air spray method, airless spray method, dipping method, spin coating method, flow coating.
- the film is formed by a method such as a coating method, a curtain coating method, or a flow coating method, and a chemical conversion film is formed through a drying process.
- the treatment temperature is preferably in the range of 5 to 60 ° C., and the treatment time is preferably about 1 to 300 seconds.
- the treatment temperature is more preferably 10 to 40 ° C., and the treatment time is more preferably 2 to 60 seconds.
- the zinc-aluminum-magnesium alloy-plated steel sheet is used for automobile bodies, automotive parts, building materials such as roofing / outer wall materials and agricultural greenhouse struts, household appliances and parts, guardrails, soundproof walls, drainage grooves, etc. It is applied to sheet coils used in civil engineering products and various molded products.
- the drying step does not necessarily require heat, and physical removal such as air drying or air blow may be performed, but heat drying may be performed to improve film formation and adhesion to the metal surface.
- the temperature is preferably 30 to 250 ° C, more preferably 40 to 200 ° C.
- the amount of the chemical conversion film formed is preferably 0.001 to 1 g / m 2 after drying, and more preferably 0.02 to 0.5 g / m 2 .
- the amount of the chemical conversion film formed is preferably 0.001 to 1 g / m 2 after drying, and more preferably 0.02 to 0.5 g / m 2 .
- the chemical film thus formed is excellent in corrosion resistance and also has good adhesion to the following resin film formed on the film.
- the surface of the metal material (member) to be protected is further improved by forming a resin film layer made of paint, lacquer, laminate film, etc. on the formed chemical film by a known method. Can be protected.
- the film thickness of the formed resin film layer is preferably 0.3 to 50 ⁇ m after drying.
- the obtained acrylic resin (1) aqueous solution had a non-volatile content of 20%, a resin solid content acid value of 623 mg KOH / g, a resin solid content hydroxyl value of 43 mg KOH / g, and a mass average molecular weight of 8400.
- the said non volatile matter is the value calculated
- Metal fluoro complex compound (C) C1: Titanium ammonium fluoride (anion is TiF 6 2 ⁇ )
- Db1 monoammonium dihydrogen phosphate
- Db2 diammonium monohydrogen phosphate
- E1 Low molecular weight polyacrylic acid (“Julimer AC-10L” manufactured by Nippon Pure Chemicals Co., Ltd., solid content acid value: 779 mg KOH / g, mass average molecular weight: 20,000 to 30,000, nonvolatile content: 40%)
- E2 High molecular weight polyacrylic acid (“Julimer AC-10H” manufactured by Nippon Pure Chemical Industries, Ltd., solid content acid value 779 mg KOH / g, mass average molecular weight 150,000, nonvolatile content 20%)
- E3 Acrylic resin (1) (prepared in Production Example 1; solid content acid value 623 mg KOH / g, mass average molecular weight 8400)
- E4 Adekabon titer HUX-232 (Adeka water-based urethane resin, solid content acid value 30 mgKOH / g, non-volatile content 30%)
- E5 Acrylic resin (2) (prepared in Production Example 2; solid content acid value 117 mgKOH /
- F1 Oxazoline group-containing polymer (F) as a curing agent)
- F2 Oxazoline group-containing acrylic resin (“Epocross WS-500” manufactured by Nippon Shokubai Co., Ltd.)
- F3 Multivalent carbodiimide (“Carbodilite SW-12G” manufactured by Nisshinbo Chemical Co., Ltd.)
- Test plate Using a cold-rolled steel sheet having a thickness of 0.5 mm as an original sheet, a hot-dip Zn—Al—Mg alloy-plated steel strip having the plating composition shown in Table 4 below is manufactured, and each steel strip is cut to be 210 mm ⁇ 300 mm plated A steel plate was prepared.
- the plating adhesion amount was 60 g / m 2 per side.
- Examples 1 to 68 and Comparative Examples 1 to 23 (Degreasing / Surface treatment)
- the plated steel sheet was spray degreased at 60 ° C. for 2 minutes using an alkaline degreasing agent (manufactured by Nippon Paint Co., Ltd., Surf Cleaner 155), washed with water, and dried at 80 ° C.
- the metal surface treatment agent prepared in the above production example was degreased after adjusting the solid content concentration so that the dry film amount (0.2 g / m 2 ) described in Tables 5 to 10 below was obtained.
- the coated steel sheet was coated with a bar coater and dried using a hot-air circulating oven so that the metal substrate reached a temperature of 80 ° C. to prepare a test plate on which a chemical conversion film was formed.
- the SST test (salt water spray test) was performed by tape-sealing the four corners of the steel sheet subjected to chemical conversion treatment (before lamination adhesion). Evaluation was performed according to the following criteria, and it was judged as acceptable if no white rust was generated for 24 hours or more. Thereafter, the test is continued for a maximum of 72 hours. The higher the numerical value over a long period, the better.
- all the metal surface treatment agents according to the examples are better in corrosion resistance and water resistance than the metal surface treatment agents according to the comparative examples, and are zinc-aluminum-magnesium alloy plated steel plates and laminate films. It can be seen that a film having high adhesion to the resin film is formed.
- Comparative Examples 1 and 12 zircon ammonium fluoride was used instead of titanium ammonium fluoride, but the water resistance and corrosion resistance were poor.
- Comparative Examples 2 and 13 and Comparative Examples 3 and 14 used an aqueous urethane resin having a low acid value or an aqueous acrylic resin having a low acid value in place of the high acid value aqueous acrylic resin. Was bad.
- Comparative Examples 6 and 17 did not contain a vanadium compound and had poor corrosion resistance and powder properties. Comparative Examples 7 and 18 did not contain a titanium fluoride compound and had poor corrosion resistance and adhesion. Comparative Examples 8 and 19 did not contain an organic phosphorus compound, the solubility of the vanadium compound was insufficient, and the corrosion resistance and the like were poor. Comparative Examples 9 and 20 did not contain an inorganic phosphorus compound and had poor corrosion resistance. Comparative Examples 10 and 21 did not contain a high acid value aqueous acrylic resin, and the film-forming property was insufficient, resulting in poor adhesion and powder properties.
- Comparative Examples 11 and 22 another curing agent (carbodiimide) was used in place of the oxazoline group-containing polymer, but sufficient crosslinking was not obtained, resulting in poor water resistance and corrosion resistance.
- Comparative Example 23 since the Al content of the plated steel sheet was small, the etching was excessive and the powder property was poor.
Abstract
Description
特許文献1の金属表面処理剤は、バナジウム化合物(A)、コバルト、ニッケル、亜鉛、マグネシウム、アルミニウム、カルシウム、ストロンチウム、バリウム及びリチウムから選ばれる金属を含む金属化合物(B)、及び、任意的に、ジルコニウム、チタニウム、モリブデン、タングステン、マンガン及びセリウムから選ばれる金属を含む金属化合物(C)を含有する、金属材料に優れた耐食性、耐アルカリ性及び層間密着性を付与するクロムフリー金属表面処理剤である。
なお、特許文献1、2の金属表面処理剤は、ともに、水溶性であっても水分散性であってもよい水系樹脂を含むことができる。
鋼板の表面に亜鉛-アルミニウム-マグネシウム合金めっき層を形成させる工程と、前記めっき層形成工程に続いて金属表面処理剤を用いて前記めっき層の表面を処理する工程とを含み、前記亜鉛-アルミニウム-マグネシウム合金めっき層が、Al:1.0~10質量%、Mg:1.0~10質量%、残部Zn及び不可避的不純物を含むめっき層であり、前記金属表面処理剤が、ジルコニル([Zr=O]2+)構造を有する化合物(A)、バナジウム化合物(B)、チタンフルオロ錯体化合物(C)、リン酸基及び/又はホスホン酸基を含有する有機リン化合物(Da)、無機リン化合物(Db)、水性アクリル樹脂(E)、硬化剤としてオキサゾリン基含有ポリマー(F)を含有し、前記水性アクリル樹脂(E)の固形分酸価が300mgKOH/g以上であり、かつ、前記水性アクリル樹脂(E)の前記金属表面処理剤に対する含有量が樹脂固形分の濃度として100ppm~30,000ppmであり、前記オキサゾリン基含有ポリマー(F)の前記金属表面処理剤に対する含有量が固形分の濃度として50ppm~5,000ppmであり、かつ前記ジルコニル([Zr=O]2+)構造を有する化合物(A)、バナジウム化合物(B)、チタンフルオロ錯体化合物(C)の金属元素換算の質量の合計と水性アクリル樹脂(E)、オキサゾリン基含有ポリマー(F)の固形分との質量比が(A+B+C)/(E+F)=10/1~1/1であり、前記金属表面処理剤のpHが3~6である、亜鉛-アルミニウム-マグネシウム合金めっき鋼板の表面を金属表面処理剤を用いて処理する方法。
[3] 前記有機リン化合物(Da)と前記無機リン化合物(Db)の質量比が、リン元素換算で、Da/Db=5/1~1/2である、上記[1]または[2]に記載の亜鉛-アルミニウム-マグネシウム合金めっき鋼板の表面を金属表面処理剤を用いて処理する方法。
[4] 前記亜鉛-アルミニウム-マグネシウム合金めっき層が、Si:0.001~2.0質量%、Ti:0.001~0.1質量%、B:0.001~0.045質量%のうち1種または2種以上をさらに含む、上記[1]~[3]のいずれかに記載の、亜鉛-アルミニウム-マグネシウム合金めっき鋼板の表面を金属処理剤を用いて処理する方法。
[5] 上記[1]~[4]のいずれかに記載の方法で処理して得られる亜鉛-アルミニウム-マグネシウム合金めっき鋼板。
そして、該亜鉛-アルミニウム-マグネシウム合金めっき層は、Si:0.001~2.0質量%、Ti:0.001~0.1質量%、B:0.001~0.045質量%のうち1種または2種以上をさらに含むものであることが好ましい。
そして、固形分酸価が300mgKOH/g以上の水性アクリル樹脂(E)、硬化剤であるオキサゾリン基含有ポリマー(F)を金属化合物(A)、(B)、(C)に対し特定の質量比で含有させることにより、金属材料との密着性、樹脂皮膜との密着性、耐食性をさらに向上させるものである。
また、有機リン化合物(Da)と無機リン化合物(Db)の質量比は、リン元素換算で、Da/Db=5/1~1/2であることが好ましい。ここでリン元素換算の質量比とは、有機リン化合物(Da)および無機リン化合物(Db)それぞれが含有するリン元素の質量の比を意味する。
前記の濃度範囲で有機リン化合物(Da)を含有することで、キレート効果により処理剤中にバナジウム化合物(B)を安定して溶解させることが可能となる。また、処理剤が前記の濃度範囲で無機リン化合物(Db)を含有することにより、エッチングにより溶出した金属カチオンと効率よく耐食性に優れる皮膜を形成させることが可能となる。さらには、有機リン化合物(Da)と無機リン化合物(Db)とが前記質量比で処理剤中に存在することにより、耐食性と耐水性との両立を図ることができる。
このような水性アクリル樹脂としては、単量体として、アクリル酸、メタクリル酸をラジカル重合させた単独重合体、及び、これらの単量体と、他のエチレン性不飽和モノマーをラジカル重合させた共重合体を用いることができる。共重合体の場合、他のエチレン性不飽和モノマーとしては、例えば、エチル(メタ)アクリレート、ブチル(メタ)アクリレートなどのアルキル(メタ)アクリレート類、2-ヒドロキシエチル(メタ)アクリレート、2-ヒドロキシプロピル(メタ)アクリレート、4-ヒドロキシブチル(メタ)アクリレートなどのヒドロキシアルキル(メタ)アクリレート類が挙げられる。水性アクリル樹脂(E)の酸価は、重合に用いるモノマー組成により調整することができる。
水性アクリル樹脂(E)は、上記モノマーを通常の方法で重合することにより得られる。例えば、モノマー混合物を公知の重合開始剤(例えばアゾビスイソブチロニトリル等)と混合し、重合可能な温度に加熱した溶剤を含むコルベン中へ滴下、熟成することにより水性アクリル樹脂を得ることができる。
市販の水性アクリル樹脂として、「ジュリマーAC-10L」(ポリアクリル酸、日本純薬社製)、「PIA728」(ポリイタコン酸、磐田化学社製)、及び「アクアリックHL580」(ポリアクリル酸、日本触媒社製)等が挙げられる。
また、複数種の水性アクリル樹脂を組み合わせて用いることも可能である。
前記の濃度範囲で含有させることにより、金属材料との密着性だけでなく、樹脂皮膜との密着性、及び耐食性をさらに向上させる。特に、樹脂皮膜との密着性を向上させる効果が著しい。
このような硬化剤であるオキサゾリン基含有ポリマー(F)は、水性アクリル樹脂(E)のカルボキシル基と反応しうる官能基を、分子内に少なくとも2個以上含有しているオキサゾリン基含有ポリマーである。
前記の濃度範囲及び質量比で含有させることにより、水性アクリル樹脂(E)と架橋構造を形成し、金属材料との密着性、樹脂皮膜との密着性、及び耐食性をさらに向上させる。
(A+B+C)/(E+F)が10/1以上の無機物過多の組成になると、密着性と耐食性が不良な化成皮膜となり、(A+B+C)/(E+F)が1/1以下の有機物が多い組成になると、耐食性が劣る化成皮膜となる。
本発明による化成処理の前工程については特に制限はないが、通常、化成処理を行う前に、金属材料に付着した油分や汚れを取り除くためにアルカリ脱脂液による脱脂処理を行い、その後、必要に応じて酸、アルカリ、ニッケル化合物やコバルト化合物等による表面調整を行う。この時、脱脂液等が金属材料の表面になるべく残留しないよう、処理後に水洗することが好ましい。
形成される樹脂皮膜層の膜厚は乾燥後で0.3~50μmであることが好ましい。
アクリル樹脂(1)の調製
イオン交換水775部を、加熱・攪拌装置付き4ツ口ベッセルに仕込み、攪拌・窒素還流しながら、内容液を80℃に加熱した。次いで、加熱、攪拌、窒素還流を行いながら、アクリル酸160部、アクリル酸エチル20部及びメタクリル酸2-ヒドロキシエチル20部の混合モノマー液、並びに、過硫酸アンモニウム1.6部及びイオン交換水23.4部の混合液を、それぞれ滴下漏斗を用いて、3時間かけて滴下した。滴下終了後、加熱、攪拌、窒素還流を2時間継続した。加熱・窒素還流を止め、溶液を攪拌しながら30℃まで冷却し、200メッシュ櫛にて濾過して、無色透明の水溶性アクリル樹脂(1)水溶液を得た。得られたアクリル樹脂(1)水溶液は、不揮発分20%、樹脂固形分酸価623mgKOH/g、樹脂固形分水酸基価43mgKOH/g、質量平均分子量8400であった。なお、前記不揮発分は、得られたアクリル樹脂(1)水溶液2gを150℃のオーブンにて1時間加熱後の残存質量から求めた値である。
アクリル樹脂(2)の調製
アクリル樹脂のモノマー組成を、アクリル酸30部、アクリル酸エチル70部、メタクリル酸2-ヒドロキシエチル100部としたことのほかは、製造例1と同様の手順にて、アクリル樹脂合成を行った。合成樹脂をベッセル中で冷却中、約60℃近傍で液が白濁したため、攪拌しながら中和剤として25%アンモニア28.3部を添加した。30℃まで冷却し、淡赤褐色のアクリル樹脂(2)水溶液を得た。得られたアクリル樹脂(2)水溶液は、不揮発分19.4%、樹脂固形分酸価117、樹脂固形分水酸基価216、質量平均分子量11,600であった。
水に、ジルコニウム化合物(A)、バナジウム化合物(B)、金属フルオロ錯体化合物(C)、有機リン化合物(Da)、無機リン化合物(Db)、水性アクリル樹脂(E)及び硬化剤であるオキサゾリン基含有ポリマー(F)を下記表1~3に示した所定量加え(比較例では無添加成分ある場合あり)、総量を1000質量部として金属表面処理剤1~35を調製した。
(ジルコニウム化合物(A))
A1:硝酸ジルコニル(カチオンは、ZrO2+)
A2:酢酸ジルコニル(カチオンは、ZrO2+)
A3:硫酸ジルコニル(カチオンは、ZrO2+)
A4:炭酸ジルコニルアンモニウム(カチオンは、ZrO2+)
B1:メタバナジン酸アンモニウム
B2:メタバナジン酸ナトリウム
C1:チタンフッ化アンモニウム(アニオンは、TiF6 2-)
C2:ジルコンフッ化アンモニウム(アニオンは、ZrF6 2-)
Da1:1-ヒドロキシエチリデン-1,1-ジホスホン酸
Da2:アミノトリメチレンホスホン酸
Da3:2-ホスホノブタン-1,2,4-トリカルボン酸
Db1:リン酸二水素一アンモニウム
Db2:リン酸一水素二アンモニウム
E1:低分子量ポリアクリル酸(日本純薬社製「ジュリマーAC-10L」、固形分酸価 779mgKOH/g、質量平均分子量 20,000~30,000、不揮発分 40%)
E2:高分子量ポリアクリル酸(日本純薬社製「ジュリマーAC-10H」、固形分酸価 779mgKOH/g、質量平均分子量 150,000、不揮発分20%)
E3:アクリル樹脂(1)(製造例1で調製したもの;固形分酸価 623mgKOH/g、質量平均分子量 8400)
E4:アデカボンタイター HUX-232(ADEKA社製水性ウレタン樹脂、固形分酸価 30mgKOH/g、不揮発分30%)
E5:アクリル樹脂(2)(製造例2で調製したもの;固形分酸価 117mgKOH/g、質量平均分子量 11,600)
F1:オキサゾリン基含有アクリル樹脂(日本触媒社製「エポクロスWS-300」)
F2:オキサゾリン基含有アクリル樹脂(日本触媒社製「エポクロスWS-500」)
F3:多価カルボジイミド(日清紡ケミカル社製「カルボジライトSW-12G」)
板厚0.5mmの冷延鋼板を原板として、下記の表4に示すめっき組成を有する溶融Zn-Al-Mg合金めっき鋼帯を製造し、それぞれの鋼帯を切断して210mm×300mmのめっき鋼板を準備した。めっき付着量は、片面あたり60g/m2とした。
(脱脂・表面処理)
上記めっき鋼板を、アルカリ脱脂剤(日本ペイント社製、サーフクリーナー155)を用いて60℃で2分間スプレー脱脂し、水洗後、80℃で乾燥した。続いて、上記の製造例にて調製した金属表面処理剤を、下記表5~10記載の乾燥皮膜量(0.2g/m2)となるように固形分濃度を調整した後、脱脂した上記めっき鋼板にバーコーターで塗布し、熱風循環型オーブンを用いて金属基材の到達温度が80℃となるよう乾燥させ、化成皮膜が形成された試験板を作製した。
試験板表面にエポキシ系接着剤を塗布し、塩化ビニルフィルムを貼り合わせ、ラミネート鋼板を得た。
まず、フィルムを接着したラミネート鋼板からJIS 13号A試験片を切り出し、その試験片に引張試験機により18%の伸びを付与した。続いて、試験片の平行部のフィルムに対し、試験片の長手方向に15mmの間隔を隔てて2本の平行な切れ目を入れ、その平行線の間のフィルムを強制的に剥離させて、その時の剥離強度を測定した。下記基準に準じて評価を行った。評点3以上をもって合格とした。
<評価基準>
4:剥離強度50N/15mm以上
3:剥離強度37.5N/15mm以上50N/15mm未満
2:剥離強度15N/15mm以上37.5N/15mm未満
1:剥離強度15N/15mm未満
フィルムを接着したラミネート鋼板からJIS 13号A試験片を切り出し、沸騰水中に4時間浸漬後、上記フィルム加工密着性試験と同様の手法にて平面部のフィルム剥離強度(N/15mm)を測定した。評価は下記の判定基準に準じて行った。評点3以上をもって合格とした。
<評価基準>
4:剥離強度50N/15mm以上
3:剥離強度37.5N/15mm以上50N/15mm未満
2:剥離強度15N/15mm以上37.5N/15mm未満
1:剥離強度15N/15mm未満
化成処理後の各試験板の外観(粉を噴いた様な外観になるか否か)を目視評価した。評価は下記の判定基準に準じて行った。評点3をもって合格とした。
<評価基準>
3:手やロールで擦っても粉(=皮膜)に脱落が見られない
1:手やロールで擦ると粉(=皮膜)に脱落が見られる
作製した各金属表面処理剤を40℃及び5℃の恒温槽中に一定期間(1ヶ月)保存し、増粘や沈降物の有無を評価した。評価は下記の判定基準に準じて行った。評点3をもって合格とした。
<評価基準>
3:40℃および5℃の恒温槽中に1ヶ月静置後、増粘も沈降物も見られない
1:40℃および5℃の恒温槽中に1ヶ月静置後、増粘または沈降物が認められる
化成処理した鋼板(ラミネート接着前)の4隅をテープシールしてSST試験(塩水噴霧試験)を行った。評価は下記の判定基準に準じて行い、24時間以上白錆の発生がないことをもって合格とした。それ以降最大72時間まで試験を継続するが、長期間にわたって数値が高ければ高いほど良好である。
<評価基準>
時間:平面部に白錆が発生しなかった時間
-:SST試験24時間で平面部に白錆発生
(表面調整剤)
Ni:ニッケル系表面調整剤(日本ペイント社製、NPコンディショナー710)
― :表面調整なし
Niの付着量は、5mg/m2とした。
比較例2、13および比較例3、14は、高酸価の水性アクリル樹脂に代えて、それぞれ酸価の低い水性ウレタン樹脂、もしくは酸価の低い水性アクリル樹脂を使用したが、いずれも密着性が不良であった。
比較例4、15は、pHが6より高いためエッチング不足となり、密着性などが不良であった。
比較例5、16は、(A+B+C)/(E+F)=10/1より大きい(無機物が多い)ため、密着性、耐食性が不良であった。
比較例6、17は、バナジウム化合物を含有しておらず、耐食性、パウダー性が不良であった。
比較例7、18は、チタンフッ化化合物を含有しておらず、耐食性、密着性が不良であった。
比較例8、19は、有機リン化合物を含有しておらず、バナジウム化合物の溶解性が不十分となり、耐食性などが不良であった。
比較例9、20は、無機リン化合物を含有しておらず、耐食性が不良であった。
比較例10、21は、高酸価の水性アクリル樹脂を含有しておらず、造膜性が不足して密着性、パウダー性が不良であった。
比較例11、22は、オキサゾリン基含有ポリマーに代えて、別の硬化剤(カルボジイミド)を使用したが、十分な架橋が得られず、耐水性、耐食性が不良であった。
比較例23は、めっき鋼板のAl含有量が少ないため、エッチング過剰となりパウダー性が不良であった。
Claims (5)
- 亜鉛-アルミニウム-マグネシウム合金めっき鋼板の表面を金属表面処理剤を用いて処理する方法であって、
鋼板の表面に亜鉛-アルミニウム-マグネシウム合金めっき層を形成させる工程と、
前記めっき層形成工程に続いて金属表面処理剤を用いて前記めっき層の表面を処理する工程とを含み、
前記亜鉛-アルミニウム-マグネシウム合金めっき層が、Al:1.0~10質量%、Mg:1.0~10質量%、残部Zn及び不可避的不純物を含むめっき層であり、
前記金属表面処理剤が、
ジルコニル([Zr=O]2+)構造を有する化合物(A)、
バナジウム化合物(B)、
チタンフルオロ錯体化合物(C)、
リン酸基及び/又はホスホン酸基を含有する有機リン化合物(Da)、
無機リン化合物(Db)、
水性アクリル樹脂(E)、
硬化剤としてオキサゾリン基含有ポリマー(F)を含有し、
前記水性アクリル樹脂(E)の酸価が300mgKOH/g以上であり、かつ、前記水性アクリル樹脂(E)の前記金属表面処理剤に対する含有量が樹脂固形分の濃度として100ppm~30,000ppmであり、
前記オキサゾリン基含有ポリマー(F)の前記金属表面処理剤に対する含有量が固形分の濃度として50ppm~5,000ppmであり、
かつ前記ジルコニル([Zr=O]2+)構造を有する化合物(A)、バナジウム化合物(B)、チタンフルオロ錯体化合物(C)の金属元素換算の質量の合計と水性アクリル樹脂(E)、オキサゾリン基含有ポリマー(F)の固形分との質量比が(A+B+C)/(E+F)=10/1~1/1であり、
前記金属表面処理剤のpHが3~6である、
亜鉛-アルミニウム-マグネシウム合金めっき鋼板の表面を金属表面処理剤を用いて処理する方法。 - 前記水性アクリル樹脂(E)と前記硬化剤であるオキサゾリン基含有ポリマー(F)の固形分の質量比がE/F=20/1~2/3である、請求項1に記載の亜鉛-アルミニウム-マグネシウム合金めっき鋼板の表面を金属表面処理剤を用いて処理する方法。
- 前記有機リン化合物(Da)と前記無機リン化合物(Db)の質量比が、リン元素換算で、Da/Db=5/1~1/2である、請求項1または2に記載の亜鉛-アルミニウム-マグネシウム合金めっき鋼板の表面を金属表面処理剤を用いて処理する方法。
- 前記亜鉛-アルミニウム-マグネシウム合金めっき層が、Si:0.001~2.0質量%、Ti:0.001~0.1質量%、B:0.001~0.045質量%のうち1種または2種以上をさらに含む、請求項1~3のいずれか1項に記載の、亜鉛-アルミニウム-マグネシウム合金めっき鋼板の表面を金属処理剤を用いて処理する方法。
- 請求項1~4のいずれか1項に記載の方法で処理して得られる亜鉛-アルミニウム-マグネシウム合金めっき鋼板。
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BR112016011820A2 (pt) | 2017-09-19 |
KR102107271B1 (ko) | 2020-05-06 |
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