WO2012133111A1 - 錫めっき鋼材用表面処理剤組成物及び表面処理された錫めっき鋼材 - Google Patents
錫めっき鋼材用表面処理剤組成物及び表面処理された錫めっき鋼材 Download PDFInfo
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- WO2012133111A1 WO2012133111A1 PCT/JP2012/057348 JP2012057348W WO2012133111A1 WO 2012133111 A1 WO2012133111 A1 WO 2012133111A1 JP 2012057348 W JP2012057348 W JP 2012057348W WO 2012133111 A1 WO2012133111 A1 WO 2012133111A1
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- C—CHEMISTRY; METALLURGY
- C25—ELECTROLYTIC OR ELECTROPHORETIC PROCESSES; APPARATUS THEREFOR
- 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
- C25D3/42—Electroplating: Baths therefor from solutions of light metals
- C25D3/44—Aluminium
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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
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- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09D—COATING COMPOSITIONS, e.g. PAINTS, VARNISHES OR LACQUERS; FILLING PASTES; CHEMICAL PAINT OR INK REMOVERS; INKS; CORRECTING FLUIDS; WOODSTAINS; PASTES OR SOLIDS FOR COLOURING OR PRINTING; USE OF MATERIALS THEREFOR
- C09D131/00—Coating compositions based on homopolymers or copolymers of compounds having one or more unsaturated aliphatic radicals, each having only one carbon-to-carbon double bond, and at least one being terminated by an acyloxy radical of a saturated carboxylic acid, of carbonic acid, or of a haloformic acid; Coating compositions based on derivatives of such polymers
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- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09D—COATING COMPOSITIONS, e.g. PAINTS, VARNISHES OR LACQUERS; FILLING PASTES; CHEMICAL PAINT OR INK REMOVERS; INKS; CORRECTING FLUIDS; WOODSTAINS; PASTES OR SOLIDS FOR COLOURING OR PRINTING; USE OF MATERIALS THEREFOR
- C09D133/00—Coating compositions based on homopolymers or copolymers of compounds having one or more unsaturated aliphatic radicals, each having only one carbon-to-carbon double bond, and at least one being terminated by only one carboxyl radical, or of salts, anhydrides, esters, amides, imides, or nitriles thereof; Coating compositions based on derivatives of such polymers
- C09D133/02—Homopolymers or copolymers of acids; Metal or ammonium salts thereof
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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
- C09D5/44—Coating compositions, e.g. paints, varnishes or lacquers, characterised by their physical nature or the effects produced; Filling pastes for electrophoretic applications
- C09D5/4407—Coating compositions, e.g. paints, varnishes or lacquers, characterised by their physical nature or the effects produced; Filling pastes for electrophoretic applications with polymers obtained by polymerisation reactions involving only carbon-to-carbon unsaturated bonds
- C09D5/4411—Homopolymers or copolymers of acrylates or methacrylates
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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
- 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
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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
- 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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- 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
- 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
- C23C28/345—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 with at least one oxide layer
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- C—CHEMISTRY; METALLURGY
- 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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- C—CHEMISTRY; METALLURGY
- 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
- C25D5/50—After-treatment of electroplated surfaces by heat-treatment
- C25D5/505—After-treatment of electroplated surfaces by heat-treatment of electroplated tin coatings, e.g. by melting
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- C—CHEMISTRY; METALLURGY
- C25—ELECTROLYTIC OR ELECTROPHORETIC PROCESSES; APPARATUS THEREFOR
- C25D—PROCESSES FOR THE ELECTROLYTIC OR ELECTROPHORETIC PRODUCTION OF COATINGS; ELECTROFORMING; APPARATUS THEREFOR
- C25D7/00—Electroplating characterised by the article coated
- C25D7/06—Wires; Strips; Foils
- C25D7/0614—Strips or foils
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- C—CHEMISTRY; METALLURGY
- C25—ELECTROLYTIC OR ELECTROPHORETIC PROCESSES; APPARATUS THEREFOR
- C25D—PROCESSES FOR THE ELECTROLYTIC OR ELECTROPHORETIC PRODUCTION OF COATINGS; ELECTROFORMING; APPARATUS THEREFOR
- C25D9/00—Electrolytic coating other than with metals
- C25D9/04—Electrolytic coating other than with metals with inorganic materials
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- C—CHEMISTRY; METALLURGY
- C25—ELECTROLYTIC OR ELECTROPHORETIC PROCESSES; APPARATUS THEREFOR
- C25D—PROCESSES FOR THE ELECTROLYTIC OR ELECTROPHORETIC PRODUCTION OF COATINGS; ELECTROFORMING; APPARATUS THEREFOR
- C25D9/00—Electrolytic coating other than with metals
- C25D9/04—Electrolytic coating other than with metals with inorganic materials
- C25D9/08—Electrolytic coating other than with metals with inorganic materials by cathodic processes
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- C—CHEMISTRY; METALLURGY
- C25—ELECTROLYTIC OR ELECTROPHORETIC PROCESSES; APPARATUS THEREFOR
- C25D—PROCESSES FOR THE ELECTROLYTIC OR ELECTROPHORETIC PRODUCTION OF COATINGS; ELECTROFORMING; APPARATUS THEREFOR
- C25D9/00—Electrolytic coating other than with metals
- C25D9/04—Electrolytic coating other than with metals with inorganic materials
- C25D9/08—Electrolytic coating other than with metals with inorganic materials by cathodic processes
- C25D9/10—Electrolytic coating other than with metals with inorganic materials by cathodic processes on iron or steel
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
- Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
- Y10T428/00—Stock material or miscellaneous articles
- Y10T428/12—All metal or with adjacent metals
- Y10T428/12493—Composite; i.e., plural, adjacent, spatially distinct metal components [e.g., layers, joint, etc.]
- Y10T428/12535—Composite; i.e., plural, adjacent, spatially distinct metal components [e.g., layers, joint, etc.] with additional, spatially distinct nonmetal component
- Y10T428/12611—Oxide-containing component
Definitions
- the present invention relates to a surface treatment agent composition for tin-plated steel materials, and more specifically, a tin-plated steel material capable of imparting blackening resistance to the steel material by being used when electrolytically treating the tin-plated steel material.
- the present invention relates to a surface treatment agent composition.
- chromate treatment is known as a treatment for improving the adhesion to an organic film such as a coating film while imparting corrosion resistance to a steel material or a plated steel material.
- Chromate treatment is widely used in the fields of home appliances, building materials, vehicles, aircraft, containers, etc. due to its excellent corrosion resistance and adhesion to organic films.
- a metal container such as a beverage can as a use of tin or tin-based alloy plated steel material, but as a surface treatment for the metal container, cathodic electrolytic treatment of tin or tin-based alloy plated steel material in an aqueous solution of sodium dichromate Chromate treatment is performed.
- the chromate-treated surface exhibits excellent adhesion to the organic resin coating, which is extremely useful for forming a barrier layer such as a coating film or a laminate on the surface of the metal container.
- hexavalent chromium used for chromate treatment is toxic and has a heavy impact on the environment.
- the final product is treated so that no hexavalent chromium remains, and there is no problem in using the product.
- the drainage, exhaust treatment, disposal treatment, etc. caused by the chromate treatment require a large amount of money
- we will omit the chromate treatment applied to tin or tin-based alloy plated steel materials There is a movement. Therefore, development of a non-chromium surface treatment as an alternative to chromate treatment is required.
- Patent Document 1 proposes an immersion treatment using a treatment liquid containing zirconium or titanium.
- a film made of an oxide of zirconium or titanium is formed on the surface of the steel material.
- the steel material surface-treated by immersion treatment in a treatment solution containing zirconium or titanium is inferior in corrosion resistance of the formed film, and compared with electrolytic chromic acid treatment conventionally used for metal containers, Since film deposition was slow, there was a problem that productivity was remarkably inferior.
- a zirconium and / or titanium treatment using cathodic electrolysis has also been proposed as a high-speed treatment process replacing the immersion treatment (see, for example, Patent Documents 2 and 3).
- a surface-treated metal plate in which a treatment liquid containing aluminum as a film forming component is used to form a corrosion-resistant aluminum oxide film on the surface of a steel material by cathodic electrolysis (for example, a patent). (Ref. 4).
- tin ions are eluted from the tin-plated steel material that is the substrate to be treated during the treatment.
- tin ions are contained in the treatment bath.
- tin ions in the treatment bath are taken into the formed film and adhere to the surface of the film, so that the sulfur content contained in the food or drink contained in the substrate to be treated that becomes the container.
- the present invention has been made in view of the above situation, and in an electrolytic surface treatment for a tin-plated steel material, a film excellent in blackening resistance and yellowing resistance can be obtained by being excellent in removability of tin ions in a treatment bath. It is an object of the present invention to provide a surface treatment agent composition containing aluminum as a film forming component.
- the present inventors have used a surface treatment composition containing aluminum ions as a film-forming component and further containing a polycarboxylic acid.
- the polycarboxylic acid reacts selectively with the tin ions to precipitate it, and it is found that the concentration of tin ions in the treatment bath can be maintained so as not to adversely affect the properties of the film. It came to complete.
- the present invention is a surface treating agent composition for tin-plated steel materials that is used when electrolytically treating tin or tin-based alloy-plated steel materials and contains aluminum ions, fluorine ions, and polycarboxylic acids.
- the polycarboxylic acid is preferably a homopolymer having a monomer selected from acrylic acid, methacrylic acid, maleic acid and itaconic acid, or a copolymer containing at least one of these monomers as a structural unit.
- the ratio [C group] / [Al] of the molar concentration [C group] of the carboxyl group contained in the polycarboxylic acid to the molar concentration [Al] of the aluminum ion is 0.005 to 2.0. Is preferred.
- the ratio [F] / [Al] of the fluorine ion molar concentration [F] to the aluminum ion molar concentration [Al] is preferably 1 to 4.
- the mass concentration of the aluminum ions is preferably 100 ppm to 10,000 ppm.
- the pH of the surface treatment solution for tin-plated steel material at 25 ° C. is preferably 1 to 5.
- the mass concentration of tin ions contained in the surface treatment solution for tin-plated steel is 500 ppm or less.
- the present invention is a tin-plated steel material surface-treated with the above-described surface-treating agent composition for tin-plated steel material.
- aluminum is used as a film-forming component, which forms a film excellent in blackening resistance and yellowing resistance by excellent removal of tin ions in a processing bath.
- a surface treating agent composition is provided.
- the surface treatment agent composition for tin-plated steel material of the present invention (hereinafter also simply referred to as “surface treatment agent composition”) is used when electrolytically treating tin or tin-based alloy-plated steel material, Contains fluoride ions and polycarboxylic acids.
- tin-plated steel material which is the treatment target of the surface treatment agent composition, has been subjected to tin or tin-based alloy plating on the surface. It is a steel material.
- the amount of tin or tin-based plating formed on the surface of the steel material is not particularly limited.
- Tin-based alloys used for the production of tin-based alloy-plated steel materials include tin-silicon alloys, tin-silver alloys, tin-indium alloys, tin-copper alloys, tin-aluminum alloys, tin-germanium alloys, etc. Although illustrated, it is not particularly limited.
- the tin-plated steel material to be treated is immersed in the surface treatment agent composition and subjected to an electrolytic surface treatment.
- the tin-plated steel material is immersed in a treatment bath containing the surface treatment agent composition, and a negative charge is applied to become a cathode (cathode).
- an anode (anode) to which a positive charge is applied is provided as a counter electrode of the tin-plated steel material to be treated.
- the later-described aluminum ions or aluminum complexes contained in the surface treatment agent composition can no longer maintain a dissolved state, resulting in an aluminum compound film, Precipitates on the surface.
- This deposited film imparts blackening resistance to the object to be treated.
- the amount of electricity applied between the anode and the cathode is not particularly limited, but when the current density is 1 to 10 A / dm 2 and the energization time is 0.15 seconds and the stop time is 0.50 seconds, one cycle is 1
- the cycle is preferably ⁇ 24 cycles, more preferably 1 to 10 cycles.
- washing with water or washing with pure water may be performed with warm water or hot water, and depending on the application, the characteristics of the film may be further improved by reducing excess fluorine in the film.
- the chemical species used for pH adjustment is not limited.
- the surface treatment agent composition is preferably an aqueous solution, but may contain an aqueous solvent such as alcohol or ketone in order to dissolve various components. Next, each component contained in the surface treatment agent composition will be described.
- the surface treatment agent composition contains aluminum ions. As described above, this aluminum ion becomes a film forming component in the electrolytic surface treatment, and in the surface treatment composition, a compound with components such as nitrate ion, fluorine ion, sulfate ion, and various ligands described later. (Complex) is also present (hereinafter, aluminum ions and their compounds (complexes) are collectively referred to as “aluminum ions”). By undergoing electrolytic surface treatment, the aluminum ions are deposited as a composition containing aluminum oxide or aluminum hydroxide as a main component on the surface of the tin-plated steel material to form a film. This coating imparts blackening resistance to the tinned steel material.
- the aluminum ion content in the surface treating agent composition is preferably 100 ppm to 10,000 ppm. It is preferable that the content of aluminum ions in the surface treatment agent composition is 100 ppm or more, so that a film having sufficient blackening resistance can be formed on the surface of the tin-plated steel material, and is preferably 10,000 ppm or less. Thus, good solubility of aluminum ions in the surface treating agent composition can be maintained, and a uniform film can be formed on the surface of the tin-plated steel material.
- the content of aluminum ions in the surface treating agent composition is more preferably 1000 ppm to 5000 ppm, and most preferably 1500 ppm to 3000 ppm, in terms of aluminum metal.
- Aluminum ion sources include aluminates such as sodium aluminate, fluoroaluminums such as sodium fluoroaluminate, aluminum hydroxide, aluminum fluoride, aluminum oxide, aluminum sulfate, aluminum nitrate, aluminum silicate, potassium aluminum sulfate, and phosphoric acid. Examples thereof include aluminum dihydrogen and aluminum lactate. These aluminum ion sources can be used alone or in combination of two or more. As the aluminum ion source, aluminum nitrate is preferable.
- the surface treatment agent composition contains fluorine ions. Fluorine ions coordinate with aluminum ions, which are film-forming components, solubilize them, and make the surface treatment agent composition contain a sufficient amount of aluminum ions and make the surface treatment agent composition a uniform solution. This contributes to improving the uniformity of the film formed.
- Fluorine ion sources include hydrofluoric acid, sodium fluoride, ammonium fluoride, ammonium hydrogen fluoride, sodium hydrogen fluoride (HF / NaF), various fluoride salts such as potassium fluoride, and aluminum ion sources As mentioned above, it may be fluoroaluminum, aluminum fluoride, or the like. These fluorine ion sources can be used alone or in combination of two or more. As the fluoride ion source, sodium fluoride and / or ammonium fluoride is preferable.
- fluorine ions solubilize aluminum ions by complex formation to make the surface treatment composition uniform and improve the uniformity of the film formed on the surface of the tin-plated steel material.
- [F] / [Al] which is the ratio of the molar concentration [F] of fluorine ions to the molar concentration [Al] of aluminum ions contained in the surface treating agent composition, is 1 to 4. Is preferred. [F] / [Al] is preferably 1 or more, because aluminum ions are sufficiently solubilized in the surface treatment agent composition and the uniformity of the film formed on the surface of the tin-plated steel material is improved.
- [F] / [Al] is more preferably 1.5 to 3.0, and most preferably 1.9 to 2.6.
- the aluminum ion concentration and the fluorine ion concentration are respectively a metal-concentrated aluminum mass concentration and a fluorine-concentrated mass concentration.
- the molar ratio [F] / [Al] of fluorine to aluminum ions is calculated after obtaining the molar concentration (mmol / L) of aluminum ions and fluorine from these mass concentrations (ppm).
- the concentration of aluminum ions can be measured by ICP (inductively coupled plasma emission spectrometer), and the concentration of fluorine ions can be measured by ion chromatography.
- the surface treatment agent composition contains a polycarboxylic acid.
- tin ions are eluted from the tin-plated steel material to be treated into the treatment bath, but the tin ions are taken into the film formed on the surface of the tin-plated steel material. This leads to a decrease in blackening resistance and yellowing resistance of the film.
- the inventors of the present invention have added polycarboxylic acid to the surface treatment agent composition, and this polycarboxylic acid captures tin ions eluted in the treatment bath.
- the concentration of tin ions in the treatment bath is suppressed to 500 ppm or less, more preferably less than 300 ppm, and particularly preferably less than 50 ppm, which does not affect the properties of the film, while a film of aluminum ions or the like is suppressed. It was found that almost no forming components were captured and the film formation was not affected.
- This invention is completed based on such knowledge, and the surface treating agent composition of this invention contains polycarboxylic acid. When removing tin ions from the treatment bath using polycarboxylic acid, it is not necessary to raise the pH of the treatment bath, so that tin ions can be formed without substantially precipitating film forming components such as aluminum ions contained in the treatment bath.
- the treatment bath can be stably maintained, which contributes to improvement of long-term continuous productivity.
- iron ions derived from steel materials may elute from tin-plated steel materials. In that case, the eluted iron ions are also a factor that reduces the blackening resistance and yellowing resistance of the film in the same manner as tin ions. Become.
- the polycarboxylic acid can selectively remove such iron ions.
- polycarboxylic acid has a chelating action on aluminum ions. Therefore, the polycarboxylic acid assists the dissolution of aluminum ions, which are film-forming components, in the surface treatment agent composition in the same manner as the above-described fluorine ions. Furthermore, aluminum ions form a chelate with an organic substance such as polycarboxylic acid, thereby slowing the precipitation rate on the surface of the tin-plated steel material due to the increase in pH in the electrolytic surface treatment. Thereby, precipitation of a coarse material due to local excessive precipitation on the surface of the tin-plated steel material is suppressed, and a uniform and dense film is formed on the surface of the tin-plated steel material. In addition, since aluminum ions form chelates with organic substances such as polycarboxylic acids, the change in precipitation behavior associated with pH fluctuations in the treatment bath is reduced, so that pH management of the treatment bath in continuous production is facilitated.
- the polycarboxylic acid is preferably a polymer.
- a homopolymer having a monomer selected from acrylic acid, methacrylic acid, maleic acid and itaconic acid as a structural unit, or a copolymer containing at least one of these monomers as a structural unit can be preferably exemplified.
- the polycarboxylic acid is preferably polyitaconic acid and / or polyacrylic acid.
- the copolymer When the copolymer is used as a polycarboxylic acid, a copolymer obtained by copolymerizing two or more of the above monomers may be used, or one or more of the above monomers may be copolymerized with other monomers. May be used.
- “other monomers” include N-vinylpyrrolidone, N-vinylcarbazole, N-vinyloxazoline, N-vinyl-1,2,4-triazole, N-vinylcarbazole, N-vinylphthalimide, N-vinyl Vinyl compounds such as vinyl succinimide, N-vinyl imidazole, vinyl sulfonic acid, 2-sulfoethyl (meth) acrylate and vinyl sulfonic acid; vinyl ketones such as methyl vinyl ketone, phenyl vinyl ketone and divinyl ketone; (meth) acrylamide, N -Methylol (meth) acrylamide, N, N-dimethyl (meth) acrylamide, N, N-dibutyl (meth) acrylamide, N, N-dioctyl (meth) acrylamide, N-monobutyl (meth) acrylamide, N-monooct
- polycarboxylic acid has a chelating effect on aluminum ions, thereby helping to dissolve aluminum ions, forming a uniform film on the surface of tin-plated steel, and facilitating management of surface treatment in continuous production There is an effect such as. And such a chelate effect is brought about by the carboxyl group contained in polycarboxylic acid. From such a viewpoint, the ratio [C group] / [Al] of the molar concentration [C group] of the carboxyl group contained in the polycarboxylic acid to the molar concentration [Al] of the aluminum ion contained in the surface treating agent composition is A predetermined range is preferable.
- Such [C group] / [Al] is preferably 0.005 to 2.0, more preferably 0.01 to 1.0, and 0.02 to 0. .5 is most preferably exemplified.
- the concentration of aluminum ions is the mass concentration of aluminum in terms of metal.
- the molar ratio [C group] / [Al] of the carboxyl group contained in the polycarboxylic acid to the aluminum ion is the molar concentration of the carboxyl group contained in the aluminum ion and the polycarboxylic acid from these mass concentrations (ppm). Calculated after obtaining (mmol / L).
- Aluminum ingredients In addition to the aluminum ions, fluorine ions, and polycarboxylic acids, other components may be added to the surface treating agent composition in order to improve various required characteristics. Examples of such components include antibacterial agents, surfactants, chelating agents, rust inhibitors, and the like.
- Antibacterial agents include alcohols such as ethanol and isopropanol; guanidine group-containing compounds such as polyhexamethylenebiguanidine hydrochloride; benzimidazole compounds such as 2- (4-thiazolyl) benzimidazole and methyl-2-benzimidazole carbamate Phthalimide compounds such as N- (trichloromethylthio) tetrahydrophthalimide and N- (fluorochloromethylthio) phthalimide; phenol compounds such as p-chloro-m-xylenol and p-chloro-m-cresol; 2, 4, 5 Nitrile compounds such as 1,6-tetrachloroisophthalonitrile, 1,2-dibromo-2,4-dicyanobutane; (2-pyridylthio-1-oxide) sodium, bis (2-pyridylthio-1-oxide) zinc, etc.
- alcohols such as ethanol and isopropanol
- Pyridine compounds Isothiazolone compounds such as 2-methyl-4-isothiazolin-3-one and 5-chloro-2-methyl-4-isothiazolin-3-one; quaternary ammonium salts such as benzalkonium chloride and benzethonium chloride; benzoic acid, Examples thereof include ethyl p-oxybenzoate, sorbic acid, potassium sorbate, sodium dehydroacetate, sodium propionate and the like.
- These antibacterial agents can be used alone or in combination of two or more.
- the concentration of the antibacterial agent in the surface treatment composition may be set as appropriate according to the required characteristics, and may be, for example, 50 to 10,000 ppm.
- the surfactant is not particularly limited, and known nonionic surfactants, cationic surfactants, and / or anionic surfactants can be used. These surfactants can be used alone or in combination of two or more.
- the concentration of the surfactant in the surface treating agent composition may be appropriately set according to the required characteristics, and for example, it may be 50 to 10,000 ppm.
- the chelating agent is added to maintain a stable dissolved state of aluminum ions like the above-described fluorine ions and polycarboxylic acids.
- the chelating agent also acts as a scavenger for impurities mixed in the treatment bath. It does not specifically limit as a chelating agent, Citric acid, gluconic acid, malonic acid, succinic acid, tartaric acid, phosphonic acid, ethylenediaminetetraacetic acid etc. can be illustrated. These chelating agents can be used alone or in combination of two or more.
- the concentration of the chelating agent in the surface treatment agent composition may be appropriately set according to the required characteristics, and for example, it may be 50 to 10,000 ppm.
- the anticorrosive agent is not particularly limited, and tannic acid, imidazoles, triazines, guanines, hydrazines, biguanides, silane coupling agents, colloidal silica, amines, phenolic water-soluble organic compounds including phenol resins, etc. Can be illustrated.
- These rust inhibitors can be used alone or in combination of two or more.
- the concentration of the rust inhibitor in the surface treatment agent composition may be set as appropriate according to the required properties, and may be, for example, 10 to 10,000 ppm.
- the surface treating agent composition is prepared by dissolving each of the above components in water and stirring uniformly. It does not specifically limit as water which dissolves said each component, A tap water, well water, industrial water, ion-exchange water etc. can be illustrated.
- a known aqueous solvent can be added to the water in order to help the dissolution of the above components. Examples of such aqueous solvents include methanol, ethanol, isopropanol, methyl ethyl ketone, and the like.
- the surface treating agent composition is electrolyzed when the surface to be treated is subjected to electrolytic surface treatment.
- the surface treating agent composition needs to have a certain electric conductivity.
- the electric conductivity at 20 ° C. is 10 to 60 mS / cm.
- a method for adjusting the electrical conductivity of the surface treatment agent composition a method of adding a salt to the surface treatment agent composition can be mentioned.
- a salt examples include sodium nitrate, sodium sulfate, ammonium nitrate, ammonium sulfate, lithium nitrate and the like, but are not particularly limited.
- the amount of the salt to be added is not particularly limited, and may be determined by appropriately adjusting the electrical conductivity of the surface treating agent composition to a desired value.
- the pH of the surface treating agent composition at 25 ° C. is preferably 1-5.
- the pH of the surface treatment agent is 1 or more, excessive etching of the tin-plated steel material as the base material is suppressed, and a film having good characteristics can be formed on the surface of the base material.
- the pH of the surface treatment agent is 5 or less, the solubility of aluminum ions is maintained, and a sufficient amount of aluminum ions can be contained in the surface treatment agent to form a film having good characteristics. it can.
- the pH of the surface treating agent composition is more preferably 2.5 to 3.6.
- an acidic or basic compound may be added to the surface treatment agent.
- examples of such compounds include hydrochloric acid, sulfuric acid, nitric acid, sodium hydroxide, aqueous ammonia, amino alcohols such as triethanolamine and dimethylethanolamine, and potassium hydroxide, but are not particularly limited.
- the amount of these compounds to be added is not particularly limited, and may be determined by appropriately adjusting the pH of the surface treatment agent composition to a desired value.
- the tin-plated steel material is subjected to electrolytic surface treatment using the surface treating agent composition of the present invention, tin ions eluted from the tin-plated steel material are precipitated and removed from the treatment bath. Therefore, the mass concentration of tin ions in the treatment bath is suppressed to 500 ppm or less, and the film formed on the surface of the tin-plated steel material is excellent in blackening resistance and yellowing over time is suppressed.
- the tin plating steel material surface-treated with the said surface treating agent composition for tin plating steel materials is also one of this invention.
- this tin-plated steel material has a film of an aluminum compound formed on the surface thereof, and has good blackening resistance and yellowing resistance.
- [Surface treatment composition] Polyitaconic acid (manufactured by Iwata Chemical Industry Co., Ltd., trade name PIA-728, molecular weight of about 3000) so that the concentrations of aluminum ion, polycarboxylic acid and fluorine are respectively aqueous solutions having mass concentrations (ppm) shown in Table 1.
- polyacrylic acid manufactured by Nippon Shokubai Co., Ltd., trade name Aqualic HL-415, molecular weight 10,000
- aluminum nitrate Al (NO 3) 3 ⁇ 9H 2 O and the sodium fluoride NaF blended with tap water, dissolved
- the pH-adjusted surface treating agent compositions of Examples 1 to 16 and Comparative Examples 1 to 4 were prepared.
- polyitaconic acid and polyacrylic acid are used as polycarboxylic acid, and in each of Examples and Comparative Examples except Example 11, polyitaconic acid is used as polycarboxylic acid, and only Example 11 is polyacrylic acid as polycarboxylic acid. It was used. That is, the surface treatment agent composition of Example 11 is the same as the surface treatment agent composition of Example 1 except that polyacrylic acid was used as the polycarboxylic acid instead of polyitaconic acid.
- Aluminum nitrate and sodium fluoride are used as an aluminum ion source and a fluorine source, respectively, and the aluminum concentration and the fluorine concentration shown in Table 1 are a metal-concentrated aluminum mass concentration and a fluorine-concentrated mass concentration, respectively. .
- the mass concentration (ppm) of each of the above components the molar concentration (mmol / L) of the carboxyl groups contained in the aluminum ions, fluorine, and polycarboxylic acid
- the molar ratio [C group] / [Al] of the carboxyl groups contained in the polycarboxylic acid to the aluminum ions was calculated and shown in Table 1.
- the concentration of the carboxyl group contained in the polycarboxylic acid can be calculated by, for example, polyitaconic acid by mass concentration of polyitaconic acid (ppm) / (1/2 of the molecular weight of itaconic acid as a structural unit).
- generated deposit originates in the tin ion contained in the processing bath.
- tin ions with a bulk height of 0.5 mm or more were removed (O), and those with a bulk height of 0.5 mm or less were made impossible to remove tin ions.
- the results are shown in Table 2.
- the pH shown in Table 2 was at 25 ° C., and nitric acid and aqueous ammonia were used for pH adjustment.
- those having a supernatant concentration of 300 ppm or more and 500 ppm or less are preferred, those having 50 ppm or more and less than 300 ppm are more preferred, and those having a supernatant concentration of less than 50 ppm are most preferred.
- the surface treatment agent composition of the present invention containing polycarboxylic acid as an essential component has good tin ion removability, tin ions are added to the treatment bath during the surface treatment of the tin-plated steel material. Even if it elutes, it is understood that the eluting tin ions can be prevented from being precipitated and removed from the treatment bath and being taken into the film formed on the surface of the tin-plated steel material.
- the surface treatment agent compositions of Comparative Examples 1 and 2 containing polycarboxylic acid also show good tin ion removal properties (Comparative Test Examples 1 and 2). Since the treatment agent composition does not contain aluminum ions or fluorine, which are essential components of the present invention, a problem arises in terms of film formation performance.
- the supernatant concentration in all the test examples was in the range of less than 500 ppm, and in Examples 1, 2, 13, 14, 17, and 18, the supernatant concentration was less than 50 ppm.
- a low carbon cold-rolled steel sheet (plate thickness: 0.225 mm) was degreased by dipping at 70 ° C. for 15 seconds using a 3% aqueous solution of an alkaline degreasing agent (Surf Cleaner 322N8 manufactured by Nippon Paint Co., Ltd.). The degreased steel sheet was sprayed with tap water for 30 seconds and washed with water, and then pickled with a pickling agent (5% aqueous solution of sulfuric acid) at 70 ° C. for 5 seconds.
- an alkaline degreasing agent Sudf Cleaner 322N8 manufactured by Nippon Paint Co., Ltd.
- a tin plating layer having a plating thickness of 2.8 g / m 2 was formed on the surface of the steel plate under the following conditions: A reflow treatment was performed after washing with water to produce a tin-plated steel sheet.
- the obtained tin-plated steel sheet was immersed in a treatment bath (bath temperature of 45 ° C.) composed of the surface treating agent compositions of Examples 1 to 16 and Comparative Examples 1 to 4 adjusted to a predetermined pH.
- Cathodic electrolysis electrolysis condition: current density of 4 A / dm 2 , energization time of 0.15 seconds + stop time of 0.50 seconds
- the iridium oxide-coated titanium plate disposed at a distance of 17 mm between the electrodes as the anode 1 cycle, and the number of cycles is adjusted with 1 to 7 cycles so that the coating amount is 5 to 10 mg / m 2 as aluminum by fluorescent X-ray measurement).
- washing with running water, pure water washing and drying are performed.
- Table 3 shows the surface treatment agent composition used as the treatment bath and the pH of the treatment bath.
- pH described in Table 3 is a numerical value at 25 ° C., and nitric acid and aqueous ammonia were used to adjust the pH of the treatment bath.
- Test Example 42 and Test Example 43 shown in Table 3 remove precipitates generated in the simulated treatment bath used in Test Example 4 or Test Example 16 (Table 2), respectively, and the precipitates are removed. The following tests were carried out using the above treatment bath as it was.
- This Test Example 42 and Test Example 43 are for confirming the surface treatment ability in the treatment bath after precipitation removal of tin ions eluted from the tin-plated steel material, and verifying the treatment ability when the surface treatment is continuously performed. Is to do.
- This test piece was subjected to a hot water retort treatment at 120 ° C. for 30 minutes, and then immersed in water, and pulled up from the water just before the measurement.
- a tensile tester was used to peel in a 180 degree direction at a tensile speed of 5 mm / min to perform a peel test, and the adhesive strength was measured. The results are shown in the “Adhesiveness” column of Table 3, respectively.
- the evaluation is that the maximum tensile strength when the test piece is peeled off by a tensile tester (Minebea, LST-200N-S100, load cell LTTU-200N) is 1N / 15 mm or better, 3N / 15 mm or better is excellent, 5N / 15 mm or more was particularly excellent.
- a tensile tester Minebea, LST-200N-S100, load cell LTTU-200N
- test plate prepared by the method described in “Preparation of test plate” is coated with an epoxy phenol paint so that the coating thickness after baking and drying is 70 mg / dm 2, and then baked at 200 ° C. for 20 minutes. It was. Next, the test plate was cut into 70 mm square, and the cut surface was protected with a 3 mm width tape, and then 3 mm overhang processing was performed with an Erichsen tester (manufactured by Coating Tester Co., Ltd.).
- the overhang produced by the overhanging process was performed by using potassium dihydrogen phosphate KH 2 PO 4 of 4.5 g / L, sodium hydrogen phosphate Na 2 HPO 4 ⁇ 12H 2 O of 12 g / L, and L-cysteine hydrochloride. It was immersed in a model solution composed of an aqueous solution containing a monohydrate at a concentration of 2 g / L, and subjected to retort treatment at 115 ° C. for 60 minutes in a sealed container to evaluate resistance to sulfur blackening. The evaluation was performed by visually observing the change in appearance. The case where there was no significant change was marked as ⁇ , and the case where there was a significant change was marked as x. The results are shown in the “blackening resistance” column of Table 3, respectively.
- the test plate prepared by the method described in “Preparation of test plate” is cut into 70 mm square, and then heated in an oven at 200 ° C. for 1 hour, and the degree of color change of the test plate before and after heating is measured by a color difference meter (Konica Minolta Sensing).
- the yellowing resistance was evaluated by examining using a commercial name, CM-2500d).
- the evaluation is based on the color difference before and after heating in the test plate (reference test example 1) by the chromate treatment, which will be described later, to calculate the difference between the color difference before and after heating in the test plate to be evaluated and the color difference as the reference.
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Abstract
Description
表面処理剤組成物は、アルミニウムイオンを含む。このアルミニウムイオンは、上記のように、電解表面処理の際の皮膜形成成分となり、表面処理剤組成物中で、後述する硝酸イオン、フッ素イオン、硫酸イオン、各種配位子等の成分との化合物(錯体)としても存在している(以下、アルミニウムイオン及びこれらの化合物(錯体)を総称して「アルミニウムイオン」と呼ぶ)。電解表面処理を経ることにより、このアルミニウムイオンは、錫めっき鋼材の表面に酸化アルミニウム又は水酸化アルミニウムを主成分とする組成物として析出し、皮膜を形成させる。この皮膜が錫めっき鋼材に耐黒変性を付与する。
表面処理剤組成物は、フッ素イオンを含む。フッ素イオンは、皮膜形成成分であるアルミニウムイオンに配位してこれを可溶化し、表面処理剤組成物に十分な量のアルミニウムイオンを含有させるとともに、表面処理剤組成物を均一な溶液とすることで形成される皮膜の均一性を向上させるのに寄与する。
表面処理剤組成物は、ポリカルボン酸を含む。上述のように、電解表面処理が行われる際に、被処理物である錫めっき鋼材から錫イオンが処理浴に溶出するが、この錫イオンが錫めっき鋼材の表面に形成される皮膜に取り込まれると、この皮膜の耐黒変性や耐黄変性が低下することにつながる。本発明者らは、これらの問題を解決するために検討を重ねた結果、ポリカルボン酸を表面処理剤組成物に添加すると、このポリカルボン酸が、処理浴中に溶出した錫イオンを捕捉して沈殿させることにより、処理浴中の錫イオンの濃度を皮膜の特性に影響を与えない500ppm以下に、より好ましくは300ppm未満に、特に好ましくは50ppm未満に抑制する一方で、アルミニウムイオン等の皮膜形成成分を殆ど捕捉せず、皮膜の形成に影響を与えないことを見出した。本発明はこのような知見に基づいて完成されたものであり、本発明の表面処理剤組成物は、ポリカルボン酸を含有する。ポリカルボン酸を用いて処理浴から錫イオンを除去する場合、処理浴のpHを上昇させる必要がないので、処理浴に含まれるアルミニウムイオン等の皮膜形成成分を殆ど沈殿させることなく、錫イオンを選択的に除去することができるので、安定して処理浴を維持することが可能となり、長期連続生産性の向上にも寄与する。また、錫めっき鋼材から錫イオンに加えて鋼材由来の鉄イオンが溶出することがあり、その場合、溶出した鉄イオンも錫イオンと同様に皮膜の耐黒変性や耐黄変性を低下させる要因となる。ポリカルボン酸は、こうした鉄イオンも選択的に除去することができる。
表面処理剤組成物には、上記のアルミニウムイオン、フッ素イオン及びポリカルボン酸に加えて、種々の要求特性を良好なものとするために、さらにその他の成分を添加してもよい。このような成分としては、抗菌剤、界面活性剤、キレート剤、防錆剤等を例示することができる。
表面処理剤組成物は、上記の各成分を水に溶解させ、均一に撹拌することにより調製される。上記の各成分を溶解させる水としては、特に限定されず、水道水、井戸水、工業用水、イオン交換水等を例示することができる。また、この水には、上記の各成分の溶解を助けるために、公知の水系溶剤を添加することもできる。このような水系溶剤としては、メタノール、エタノール、イソプロパノール、メチルエチルケトン等が挙げられる。
アルミニウムイオン、ポリカルボン酸及びフッ素の濃度が、それぞれ表1に示す質量濃度(ppm)の水溶液となるように、ポリイタコン酸(磐田化学工業株式会社製、商品名PIA-728、分子量約3000)、ポリアクリル酸(日本触媒株式会社製、商品名アクアリックHL-415、分子量10,000)、硝酸アルミニウムAl(NO3)3・9H2O、及びフッ化ナトリウムNaFを水道水に配合し、溶解させ、実施例1~16及び比較例1~4のpH未調整の表面処理剤組成物を調製した。なお、ポリイタコン酸及びポリアクリル酸はポリカルボン酸として使用し、実施例11を除く各実施例及び各比較例ではポリカルボン酸としてポリイタコン酸を使用し、実施例11のみポリカルボン酸としてポリアクリル酸を使用した。つまり、実施例11の表面処理剤組成物は、ポリイタコン酸の代わりにポリアクリル酸をポリカルボン酸として使用したことを除いて、実施例1の表面処理剤組成物と同じである。
pHを2.5に調整した実施例1~16及び比較例1~4の各表面処理剤組成物80mLを内径45mmの容器にそれぞれ採取し、錫イオンが表2に記載の質量濃度になるように硫酸錫(II)を添加して模擬的な処理浴を作製した。硫酸錫を添加したのは、表面処理の際に錫めっき鋼材から錫イオンが処理浴に溶出した状態を再現するためである。その後、各処理浴を表2に記載のpHに調整した後に6時間静置し、処理浴の底部に生成した沈殿物のかさ高さを測定した。なお、生成した沈殿物は、処理浴に含まれていた錫イオンを由来とするものである。評価は、沈殿物のかさ高さが0.5mm以上であるものを錫イオン除去可能(○)とし、沈殿物のかさ高さが0.5mm以下のものを錫イオン除去不可能とした。結果を表2に示す。なお、表2に示したpHは25℃におけるものであり、pHの調整には硝酸及びアンモニア水を使用した。
上記で沈殿の生成した処理浴の液の上澄み液を採取し、ろ紙で沈殿を取り除いて溶液に固形物がないことを目視で確認した後、pH変動がないように硝酸もしくはアンモニア水で調整しながら測定可能な濃度範囲内になるようにイオン交換水で希釈し、誘導結合プラズマ発光分析装置(島津製作所製、ICPE-9000)により錫イオン濃度を測定した。得られた結果から、希釈率に基づいて、上澄み液中に残存する錫イオン濃度(ppm)を算出した。評価は、上澄み濃度が300ppm以上500ppm以下のものを好ましいとし、50ppm以上300ppm未満のものをより好ましいとし、50ppm未満のものを最も好ましいとする。
低炭素冷延鋼板(板厚0.225mm)を、アルカリ脱脂剤(日本ペイント株式会社製、サーフクリーナー322N8)の3%水溶液を用いて、70℃で15秒間浸漬処理して脱脂した。脱脂後の鋼板を、水道水で30秒間スプレー処理を行って水洗した後、酸洗処理剤(硫酸の5%水溶液)を用いて、70℃で5秒間浸漬処理して酸洗した。その後、水道水で30秒間スプレー処理を行って水洗した後、公知のフェロスタン浴を用いて、下記の条件にて鋼板の表面にめっき厚2.8g/m2の錫めっき層を形成させて、水洗後リフロー処理を施して、錫めっき鋼板を作製した。
(めっき条件)
温度:40℃
撹拌:適宜
電流密度:10A/dm2
陽極材料:市販の99.999%金属錫
処理時間:通電時間1秒停止時間0.50秒を1サイクルとして、サイクル数5~15回
リフロー:得られた錫めっき鋼板を誘導加熱により錫の融点以上まで加熱後イオン交換水をかけて急冷
上記「試験板の作製」に記載した方法で作製した試験板のそれぞれについて、形成された皮膜を乾燥した後に、蛍光X線装置(株式会社島津製作所製、XRF-1500)を使用して皮膜中のアルミニウム量を測定し、炭素・水素/水分分析装置(LECO社製、RC612)を使用して皮膜中の炭素量(C量)を測定した。その結果を表3の「皮膜量」欄にそれぞれ示す。
上記「試験板の作製」に記載した方法で作製した試験板のそれぞれについて、形成された皮膜表面へのスラッジ状の異物付着の有無を調べることにより、皮膜の均一性を評価した。なお、このような異物の付着は、処理浴が白濁している(すなわち、均一な溶液になっていない)場合に、特に観察されるものである。評価は、皮膜表面に異物付着が観察されたものを○とし、皮膜表面に異物付着が観察されたもの又は試験板に皮膜が形成されなかったものを×とした。その結果を表3の「皮膜外観」欄にそれぞれ示す。
上記「試験板の作製」に記載した方法で陰極電解(電解条件4A/dm2)を行った際、錫めっき鋼板の表面に、アルミニウムとして5mg/m2の皮膜が付着するのに必要なサイクル数を測定した。その結果を表3の「付着性」欄にそれぞれ示す。なお、評価は、必要な処理サイクル数が、1~10サイクルであれば、生産性が良好と判断し、特に1~6サイクルはより好ましく、さらに3サイクル未満であれば最もこの好ましいと考えられる。5mg/m2の皮膜が付着するのに10サイクル以上必要としたもの(皮膜が形成されなかたものも含む。)は生産性が良好ではないと考え、「>10」と記載した。
上記「試験板の作製」に記載した方法で作製した試験板のそれぞれについて、試験板を230℃に加熱した状態で、ラミネートロールを介してポリエステルフィルム(帝人デュポンフィルム株式会社製、テフレックスFT-20、厚さ20μm)を熱圧着し、その後直ちに水冷することでポリエステル被覆試験板とした。得られたポリエステル被覆試験板のそれぞれについて、試験板を15mm幅で70mm長さに短冊状に切断し、短冊の先端から30mm位置に測定反対面側から素地に達する切り込み傷を入れた。この試験片を120℃30分の熱水レトルト処理を行った後、一旦水中に浸漬し、測定直前に水中から引き上げた。予め入れた傷を起点として折り曲げを繰り返すことにより金属片のみを破断し、樹脂フィルムだけでつながっている部分を作った後、この部分を内面側となるようにして180度方向に折り曲げた後、引張試験機を用いて引張速度5mm/分で180度方向に引き剥がして剥離試験を行い、接着強度を測定した。その結果を表3の「接着性」欄にそれぞれ示す。評価は、引張試験機(Minebea社製、LST-200N-S100、ロードセルLTTU-200N)により試験片を剥離した際の最大引張強度が、1N/15mm以上を良好、3N/15mm以上を優良、5N/15mm以上のものを特に優良とした。
上記「試験板の作製」に記載した方法で作製した試験板に、焼付け乾燥後の塗膜厚が70mg/dm2となるようにエポキシフェノール系塗料を塗装後、200℃20分間の焼付けを行った。次いで試験板を70mm角に切断した後、切断面を3mm幅テープで保護し、その後エリクセン試験機(コーティングテスター株式会社製)により3mmの張り出し加工を行った。次いで、張り出し加工により生じた張り出し部を、リン酸二水素カリウムKH2PO4を4.5g/L、リン酸水素ナトリウムNa2HPO4・12H2Oを12g/L、及びL-システイン塩酸塩一水和物を2g/Lの濃度で含む水溶液からなるモデル液中に浸漬し、密封容器中で115℃60分のレトルト処理を行って耐硫化黒変性を評価した。評価は、外観の変化を目視で判定することにより行い、著しい変化の無かったものを○とし、著しい変化のあったものを×とした。その結果を表3の「耐黒変性」欄にそれぞれ示す。
上記「試験板の作製」に記載した方法で作製した試験板を70mm角に切断した後、200℃のオーブンで1時間加熱し、加熱前後における試験板の変色の程度を色差計(コニカミノルタセンシング株式会社製、商品名CM-2500d)を用いて調べることにより、耐黄変性を評価した。評価は、後述するクロメート処理による試験板(参考試験例1)における加熱前後の色差を基準として、評価対象となる試験板における加熱前後の色差と上記基準となる色差との差を算出し、この差が、1.9以下であるものを○とし、1.9を超え3未満のものを○-とし、3以上であるものを×とした。その結果を表3の「耐黄変性」欄にそれぞれ示す。なお、色差は、(ΔL2+Δa2+Δb2)0.5で算出される。
市販のクロメート処理(311処理)ブリキ板(Sn量2.8g/m2)に対して上記の各評価を行い、その結果を表3に参考試験例1として示す。また、未処理の錫めっき鋼板(上記「試験板の作製」に記載した錫めっき処理のみを施した鋼板)に対して上記の各評価を行い、その結果を表3に参考試験例2として示す。
実施例1~16及び比較例1~4の表面処理剤組成物について、それぞれ25℃におけるpHを3.5に調整した後の電気伝導度を測定した。その結果を表4に示す。なお、pHの調整には硝酸及びアンモニア水を使用した。
*1 PIAはポリイタコン酸を意味し、PAAはポリアクリル酸を意味する。
*2 付着性欄に記載した数値は、試験板に所定の厚さの皮膜を形成させるのに要した陰極電解の処理サイクル数であり、小さいほど良好であることを意味する。なお、この数値が「>10」で示されたものには、陰極電解によって有効な皮膜が形成されなかったものも含まれる。
*3 試験例42、43は、上記試験例4、16における試験後の処理浴から沈殿を除去した後、その処理浴を使用して試験を行った結果である。
*4 比較試験例9は、上記比較試験例3における試験後の処理浴を使用して試験を行った結果である。なお、上記比較試験例3における試験後の処理浴では沈殿が生じなかったため、沈殿除去操作は行っていない。
Claims (8)
- 錫又は錫系合金めっき鋼材を電解表面処理する際に使用され、アルミニウムイオン、フッ素イオン及びポリカルボン酸を含む錫めっき鋼材用表面処理剤組成物。
- 前記ポリカルボン酸が、アクリル酸、メタクリル酸、マレイン酸、イタコン酸から選択されるモノマーを構成単位とするホモポリマー、又はこれらのモノマーの少なくとも1種を構成単位として含むコポリマーである請求項1記載の錫めっき鋼材用表面処理剤組成物。
- 前記アルミニウムイオンのモル濃度[Al]に対する前記ポリカルボン酸に含まれるカルボキシル基のモル濃度[C基]の比[C基]/[Al]が、0.005~2.0である請求項1又は2記載の錫めっき鋼材用表面処理剤組成物。
- 前記アルミニウムイオンのモル濃度[Al]に対する前記フッ素イオンのモル濃度[F]の比[F]/[Al]が1~4である請求項1~3のいずれか1項記載の錫めっき鋼材用表面処理剤組成物。
- 前記アルミニウムイオンの質量濃度が100ppm~10,000ppmである請求項1~4のいずれか1項記載の錫めっき鋼材用表面処理剤組成物。
- 25℃におけるpHが1~5である請求項1~5のいずれか1項記載の錫めっき鋼材用表面処理剤組成物。
- 錫イオンを含有し、前記錫イオンの質量濃度が500ppm以下である請求項1~6のいずれか1項記載の錫めっき鋼材用表面処理剤組成物。
- 請求項1~7のいずれか1項記載の錫めっき鋼材用表面処理剤組成物により表面処理された錫めっき鋼材。
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US14/006,843 US20140377581A1 (en) | 2011-03-25 | 2012-03-22 | Surface treatment agent composition for tin-plated steel, and tin-plated steel subjected to surface treatment |
CN201280014674.6A CN103620092B (zh) | 2011-03-25 | 2012-03-22 | 镀锡钢材用表面处理剂组合物以及表面处理过的镀锡钢材 |
EP12762849.3A EP2690201A4 (en) | 2011-03-25 | 2012-03-22 | SURFACE TREATMENT AGENT COMPOSITION FOR STAINLESS STEEL, AND STAINLESS STEEL SUBJECT TO SURFACE TREATMENT |
JP2013507460A JP5894576B2 (ja) | 2011-03-25 | 2012-03-22 | 錫めっき鋼材用表面処理剤組成物及び表面処理された錫めっき鋼材 |
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WO2015064186A1 (ja) * | 2013-10-31 | 2015-05-07 | 東洋鋼鈑株式会社 | 表面処理鋼板の製造方法、表面処理鋼板、および有機樹脂被覆金属容器 |
WO2016002886A1 (ja) * | 2014-07-02 | 2016-01-07 | 東洋鋼鈑株式会社 | 表面処理基材の製造方法 |
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CN105506604A (zh) * | 2015-12-31 | 2016-04-20 | 芜湖奕辰模具科技有限公司 | 一种镀锡钢板表面处理用处理液 |
CN105506597A (zh) * | 2015-12-31 | 2016-04-20 | 芜湖奕辰模具科技有限公司 | 一种镀锡钢板表面处理用处理液的制备方法 |
JP7137586B2 (ja) * | 2018-02-05 | 2022-09-14 | 富士フイルム株式会社 | 処理液、及び、処理方法 |
JP2022059731A (ja) * | 2020-10-02 | 2022-04-14 | メルテックス株式会社 | バレルめっき用スズめっき液 |
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JPWO2012133111A1 (ja) | 2014-07-28 |
US20140377581A1 (en) | 2014-12-25 |
EP2690201A4 (en) | 2014-09-10 |
CN103620092A (zh) | 2014-03-05 |
CN103620092B (zh) | 2016-06-22 |
JP5894576B2 (ja) | 2016-03-30 |
EP2690201A1 (en) | 2014-01-29 |
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