WO2015064529A1 - 合金めっき被覆材料、および合金めっき被覆材料の製造方法 - Google Patents
合金めっき被覆材料、および合金めっき被覆材料の製造方法 Download PDFInfo
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- WO2015064529A1 WO2015064529A1 PCT/JP2014/078475 JP2014078475W WO2015064529A1 WO 2015064529 A1 WO2015064529 A1 WO 2015064529A1 JP 2014078475 W JP2014078475 W JP 2014078475W WO 2015064529 A1 WO2015064529 A1 WO 2015064529A1
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B32—LAYERED PRODUCTS
- B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- B32B15/00—Layered products comprising a layer of metal
- B32B15/01—Layered products comprising a layer of metal all layers being exclusively metallic
- B32B15/013—Layered products comprising a layer of metal all layers being exclusively metallic one layer being formed of an iron alloy or steel, another layer being formed of a metal other than iron or aluminium
- B32B15/015—Layered products comprising a layer of metal all layers being exclusively metallic one layer being formed of an iron alloy or steel, another layer being formed of a metal other than iron or aluminium the said other metal being copper or nickel or an alloy thereof
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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
- C23C18/00—Chemical coating by decomposition of either liquid compounds or solutions of the coating forming compounds, without leaving reaction products of surface material in the coating; Contact plating
- C23C18/16—Chemical coating by decomposition of either liquid compounds or solutions of the coating forming compounds, without leaving reaction products of surface material in the coating; Contact plating by reduction or substitution, e.g. electroless plating
- C23C18/48—Coating with alloys
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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
- C23C18/00—Chemical coating by decomposition of either liquid compounds or solutions of the coating forming compounds, without leaving reaction products of surface material in the coating; Contact plating
- C23C18/16—Chemical coating by decomposition of either liquid compounds or solutions of the coating forming compounds, without leaving reaction products of surface material in the coating; Contact plating by reduction or substitution, e.g. electroless plating
- C23C18/48—Coating with alloys
- C23C18/50—Coating with alloys with alloys based on iron, cobalt or nickel
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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
- C23C22/48—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 not containing phosphates, hexavalent chromium compounds, fluorides or complex fluorides, molybdates, tungstates, vanadates or oxalates
- C23C22/50—Treatment of iron 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
- 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
- C23C22/82—After-treatment
- C23C22/83—Chemical 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
- 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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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M8/00—Fuel cells; Manufacture thereof
- H01M8/02—Details
- H01M8/0202—Collectors; Separators, e.g. bipolar separators; Interconnectors
- H01M8/0204—Non-porous and characterised by the material
- H01M8/0206—Metals or alloys
- H01M8/0208—Alloys
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M8/00—Fuel cells; Manufacture thereof
- H01M8/02—Details
- H01M8/0202—Collectors; Separators, e.g. bipolar separators; Interconnectors
- H01M8/0204—Non-porous and characterised by the material
- H01M8/0223—Composites
- H01M8/0228—Composites in the form of layered or coated products
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M8/00—Fuel cells; Manufacture thereof
- H01M8/10—Fuel cells with solid electrolytes
- H01M2008/1095—Fuel cells with polymeric electrolytes
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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
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
- Y02E60/30—Hydrogen technology
- Y02E60/50—Fuel cells
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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.]
- Y10T428/12771—Transition metal-base component
- Y10T428/12861—Group VIII or IB metal-base component
Definitions
- the present invention relates to an alloy plating coating material and a method for manufacturing the alloy plating coating material.
- an amorphous alloy plating layer made of an amorphous alloy made of a predetermined element is formed on the substrate.
- An alloy plating coating material is disclosed.
- the amorphous alloy plating layer composed of a predetermined element is excellent in corrosion resistance, but becomes insufficient in electrical conductivity, resulting in an electrical contact. There is a problem that sufficient characteristics as a material cannot be obtained.
- the present invention has been made in view of such a situation, and an object thereof is to provide an alloy plating coating material having excellent conductivity in addition to corrosion resistance.
- the present inventors have found that the alloy plating layer formed as the outermost layer on the base material has an alloy plating layer in which the compounding ratio of a specific element constituting the alloy is within a predetermined range; As a result, the inventors have found that the above object can be achieved and have completed the present invention. Moreover, when the compounding ratio of the specific element which comprises an alloy has remove
- the outermost layer is formed by forming a base material on the base material, and an M1-M2-M3 alloy (where M1 is Ni, Fe, Co, Cu, Zn, And at least one element selected from Sn, M2 is at least one element selected from Pd, Re, Pt, Rh, Ag, and Ru, and M3 is at least one element selected from P and B
- the alloy plating layer is a plating layer having a molar ratio of M1 to M2 (M1 / M2) of 0.005 to 0.5.
- An alloy plating coating material is provided.
- the alloy plating layer preferably has a glass transition point.
- the alloy plating layer is preferably amorphous-like.
- the alloy plating layer has at least one element selected from the group consisting of M1, M2, and M3 having a diffraction profile measured by a small angle incident X-ray diffraction method using an X-ray diffractometer. A shape having no sharp peak derived from the included crystal and / or a shape having a halo derived from an amorphous structure is preferable.
- an M1-M2-M3 alloy (where M1 is selected from at least selected from Ni, Fe, Co, Cu, Zn, and Sn so as to constitute the outermost layer on the substrate)
- a method for producing an alloy plating coating material is provided.
- an alloy plating coating material excellent in conductivity in addition to corrosion resistance, an alloy plating coating material excellent in conductivity can be provided.
- FIG. 1 is a diagram showing a configuration of an alloy plating coating material 100 according to the present embodiment.
- FIG. 2A is a diagram showing an example of a diffraction profile obtained by measuring the crystal structure of Pd by a grazing incidence X-ray diffraction method using an X-ray diffractometer.
- FIG. 2B is a diagram showing an example of a diffraction profile obtained by measuring the amorphous-like alloy plating layer 20 with an X-ray diffractometer.
- FIG. 2C is a diagram showing another example of a diffraction profile obtained by measuring the amorphous-like alloy plating layer 20 with an X-ray diffractometer.
- FIG. 2A is a diagram showing an example of a diffraction profile obtained by measuring the crystal structure of Pd by a grazing incidence X-ray diffraction method using an X-ray diffractometer.
- FIG. 2B is a diagram showing an example of a diffraction profile
- FIG. 3A is a graph (part 1) showing a result of evaluating the corrosion resistance of the alloy plating coating material 100 obtained in the example.
- FIG. 3B is a graph (part 2) showing a result of evaluating the corrosion resistance of the alloy plating coating material 100 obtained in the example.
- FIG. 3C is a graph (part 3) showing a result of evaluating the corrosion resistance of the alloy plating coating material 100 obtained in the example.
- FIG. 4 is a diagram for explaining a method of measuring the contact resistance of the alloy plating coating material 100 obtained in the example.
- FIG. 5 is a graph showing the results of measuring the contact resistance of the alloy plating coating material 100 obtained in the example.
- the alloy plating coating material 100 of this embodiment has an M1-M2-M3 alloy (where M1 is selected from Ni, Fe, Co, Cu, Zn, and Sn) on a base material 10 M2 is at least one element selected from Pd, Re, Pt, Rh, Ag, and Ru, and M3 is at least one element selected from P and B.) And an alloy plating layer 20 constituting the outermost layer is provided.
- the alloy plating layer 20 is a plating layer having a molar ratio of M1 to M2 (M1 / M2) of 0.005 to 0.5.
- stainless steel materials such as SUS316, SUS316L, SUS304, are mentioned. Further, there are various types of stainless steel sheets such as martensite, ferrite, and austenite, and austenitic stainless steel sheets are particularly preferable.
- a predetermined passive film is formed on the surface of the stainless steel plate.
- the Cr / O value (Cr / O molar ratio) and the Cr / Fe value (Cr / Fe molar ratio) by Auger electron spectroscopic analysis on the surface are in the following ranges. Are listed. That is, the Cr / O value is preferably in the range of 0.09 to 0.20. The Cr / Fe value is preferably in the range of 0.55 to 0.80.
- the coating material 100 is excellent in corrosion resistance and conductivity.
- the Cr / O value and the Cr / Fe value by Auger electron spectroscopy can be measured by the following method, for example. That is, first, the surface of the passive film of the stainless steel plate is measured using a scanning Auger electron spectrometer (AES), and the atomic% of Cr, O, and Fe on the surface of the passive film is calculated. Then, measurement was performed with a scanning Auger electron spectrometer at five locations on the surface of the passive film, and the obtained results were averaged to obtain a Cr / O value (Cr atomic% / O atomic%). ) And Cr / Fe value (atomic% of Cr / atomic% of Fe).
- AES scanning Auger electron spectrometer
- a peak at 510 to 535 eV is a peak for Cr
- a peak at 485 to 520 eV is an O peak
- 570 to The atomic% of Cr, O, and Fe is measured by setting the peak of 600 eV as the peak of Fe and the total of these Cr, O, and Fe as 100 atomic%.
- the method for forming the passive film on the surface of the stainless steel plate is not particularly limited, and examples thereof include a method of immersing a stainless steel material such as SUS316L constituting the stainless steel plate in a sulfuric acid aqueous solution.
- the sulfuric acid concentration of the sulfuric acid aqueous solution is preferably 20 to 25% by volume.
- the temperature at which the stainless steel material is immersed is preferably 50 to 70 ° C., more preferably 60 to 70 ° C.
- the time for immersing the stainless steel material in the sulfuric acid aqueous solution is preferably 5 to 600 seconds, more preferably 5 to 300 seconds.
- the shape of the base material 10 is not particularly limited and can be appropriately selected depending on the intended use.
- a conductive metal part or plate processed into a linear shape or plate shape is processed into an uneven shape.
- a material that has been processed into a necessary shape according to the intended use such as a conductive member or a component of an electronic device that has been processed into a spring shape or a cylindrical shape.
- the thickness (diameter) and thickness (plate thickness) of the base material 10 are not particularly limited, and can be appropriately selected according to the intended use.
- the alloy plating coating material 100 can be used as a fuel cell separator, for example.
- the fuel cell separator is used as a member of a fuel cell constituting the fuel cell stack, and has a function of supplying fuel gas and air to the electrode through a gas flow path and a function of collecting electrons generated at the electrode. I have it.
- the alloy plating coating material 100 is used as a fuel cell separator, the substrate 10 having a surface on which irregularities (gas flow paths) functioning as fuel gas or air flow paths are formed in advance.
- a method for forming the gas flow path is not particularly limited, and for example, a method of forming by a press working can be mentioned.
- the alloy plating layer 20 is a plating layer formed as the outermost layer in order to improve the corrosion resistance and wear resistance of the alloy plating coating material 100 and to provide conductivity, and is an M1-M2-M3 alloy (however, M1 is at least one element selected from Ni, Fe, Co, Cu, Zn, and Sn, M2 is at least one element selected from Pd, Re, Pt, Rh, Ag, and Ru, and M3 is And a molar ratio of M1 to M2 (M1 / M2) is 0.005 to 0.5.
- the method of forming the alloy plating layer 20 is not particularly limited, and can be formed by electrolytic plating, electroless plating, sputtering, or the like, but is preferably formed by electroless plating as described later.
- M1 in the M1-M2-M3 alloy is at least one element selected from Ni, Fe, Co, Cu, Zn, and Sn. These may be used alone or in combination of two or more. For example, Ni—Fe, Ni—Co, Ni—Cu, or the like may be used.
- Each element constituting M1 is an element having a characteristic that a plating layer can be formed on the substrate 10 alone.
- M1 it is preferable to use at least one element selected from Ni and Co from the viewpoint that self-decomposition of the plating solution can be prevented and the stability of the plating solution can be improved. Is particularly preferred.
- M2 in the M1-M2-M3 alloy is at least one element selected from Pd, Re, Pt, Rh, Ag, and Ru, and these may be used alone or in combination of two or more. May be used.
- Each element constituting M2 acts as a catalyst for the reaction of the reducing agent in the plating bath when deposited on the substrate 10, and has an action of continuously proceeding with the metal deposition reaction.
- M2 is preferably at least one element selected from Pd and Ag, and particularly preferably Pd, from the viewpoint of cost reduction.
- M3 in the M1-M2-M3 alloy is at least one element selected from either P and B, and these elements may be used alone, or P—B combining them may be used. It may be used.
- Each element constituting M3 is a metalloid that constitutes a reducing agent in a plating bath for forming the alloy plating layer 20 and is normally inevitably taken into the alloy plating layer 20 when the alloy plating layer 20 is formed. Will be.
- P it is preferable to use P from the point that self-decomposition of a plating solution can be prevented and stability of a plating solution can be improved.
- the ratio of each element in the M1-M2-M3 alloy is preferably 15 to 65 atomic% for M1, 20 to 60 atomic% for M2, 15 to 40 atomic% for M3, more preferably 20 to 20 atomic%. 50 atomic%, M2 is 30 to 50 atomic%, and M3 is 20 to 30 atomic%. Furthermore, as long as the obtained alloy plating coating material 100 does not significantly reduce the corrosion resistance and wear resistance, the M1-M2-M3 alloy may contain a slight amount of impurities that are inevitably mixed. . Examples of impurities that are inevitably mixed include heavy metals such as Pb, Tl, and Bi that are added as stabilizers that prevent self-decomposition of the plating solution and stabilize the plating solution.
- impurities that are inevitably mixed include heavy metals such as Pb, Tl, and Bi that are added as stabilizers that prevent self-decomposition of the plating solution and stabilize the plating solution.
- Bi is preferably used from the viewpoint of reducing environmental burden.
- the alloy plating layer 20 can be satisfactorily formed on the substrate 10, and the obtained alloy plating coating material 100 has excellent corrosion resistance and wear resistance. It can be excellent.
- Ni-Pd-P alloy Ni-Pt-P alloy, Co-Pd-P alloy and Co-Ag-P alloy are preferable, and Ni-Pd-P alloy is particularly preferable.
- the method of forming the alloy plating layer 20 made of the M1-M2-M3 alloy is not particularly limited as described above, but when the method of forming by electroless plating is used, the elements shown in M1, M2, and M3 are used.
- a plating bath (electroless alloy plating bath) containing a reducing agent and a complexing agent is used.
- the electroless alloy plating bath may be one obtained by mixing a commonly used nickel plating bath and a palladium plating bath.
- a nickel plating bath for example, a plating comprising a nickel salt such as nickel chloride, nickel sulfate, nickel nitrate and nickel acetate, a reducing agent containing phosphorus such as hypophosphite, and a complexing agent such as citric acid. Examples include baths.
- a palladium plating bath for example, a palladium salt such as palladium chloride, a reducing agent containing phosphorus such as hypophosphite and phosphite, a reducing agent such as formic acid, and a complex such as thiodiglycolic acid. And a plating bath composed of an agent.
- a palladium salt such as palladium chloride
- a reducing agent containing phosphorus such as hypophosphite and phosphite
- a reducing agent such as formic acid
- a complex such as thiodiglycolic acid
- the obtained alloy plating layer 20 made of the Ni—Pd—P alloy has an amorphous-like structure, and both the corrosion resistance and the conductivity can be improved.
- the amorphous-like structure in the alloy plating layer 20 indicates a structure that is substantially composed of an amorphous (amorphous) material of the M1-M2-M3 alloy, and is slightly M1-M2- It refers to a structure that may contain crystals of an M3 alloy. Such a crystal has a crystal structure inevitably formed in the alloy plating layer 20 due to the influence of impurities or the like taken into the alloy plating layer 20 in the process of forming the alloy plating layer 20 on the substrate 10. Is mentioned.
- the diffraction profile when the alloy plating layer 20 is measured by a small angle incident X-ray diffraction method using an X-ray diffractometer is M1, M2, and M3.
- crystallization containing at least 1 element is mentioned. That is, when the alloy plating layer 20 is made of a Ni—Pd—P alloy and a crystal containing at least one of Ni, Pd, and P exists in the alloy plating layer 20, the obtained diffraction profile includes a crystal A sharp peak originating from is detected.
- the peak derived from the Pd crystal is detected in the vicinity of “40 °”, “46 °”, “68 °”, for example, at the diffraction angle (2 ⁇ ).
- the alloy plating layer 20 has an amorphous-like structure.
- examples of the amorphous-like structure include an example in which a diffraction profile measured by a small-angle incident X-ray diffraction method using an X-ray diffractometer has a shape having a halo derived from the amorphous structure. That is, when the alloy plating layer 20 is substantially amorphous, the obtained diffraction profile is a halo (diffraction angle (2 ⁇ ) around 20 to 60 ° derived from an amorphous structure as shown in FIGS. 2B and 2C. A smooth curve) is detected.
- 2B shows a diffraction profile obtained in Example 3 described later
- FIG. 2C shows a diffraction profile obtained in Example 4 described later.
- the alloy plating layer 20 is made of a Ni—Pd—P alloy having an amorphous structure
- FIG. The example of the diffraction profile obtained is shown.
- the alloy plating layer 20 has a halo derived from such an amorphous structure, it can be determined that the alloy plating layer 20 has an amorphous-like structure.
- the alloy plating layer 20 is made of a Ni—Pd—P alloy.
- M1, M2 an electroless alloy plating bath prepared by appropriately adjusting a plating bath containing each of the elements M3 and M3 and containing a reducing agent and a complexing agent.
- M1: M2 (molar ratio) Ni: Pd (molar ratio) described above. The ratio may be the same value.
- the alloy plating layer 20 is preferably formed using the above-described electroless alloy plating bath under the conditions of pH 4.0 to 7.0, bath temperature 30 to 50 ° C., and immersion time 5 to 20 minutes.
- the thickness of the alloy plating layer 20 to be formed is preferably 5 to 100 nm, more preferably 30 to 50 nm. By setting the thickness of the alloy plating layer 20 in the above range, the obtained alloy plating coating material 100 can be made excellent in corrosion resistance and wear resistance.
- the alloy plating coating material 100 according to the present embodiment is used as, for example, a fuel cell separator, as the base material 10 for forming such an alloy plating layer 20, as described above, A gas channel in which a gas flow path is formed in advance by press working or the like is used.
- the alloy plating layer 20 on the base material 10 on which such a gas flow path is previously formed cracks in the alloy plating layer 20 in the obtained fuel cell separator are effectively prevented. be able to.
- the alloy plating layer 20 when the alloy plating layer 20 is formed on the base material 10 on which the gas flow path is not formed, and then the gas flow path is formed by pressing or the like, the stress applied when forming the gas flow path
- the alloy plating layer 20 when the alloy plating layer 20 is formed by electroless plating, the alloy plating layer 20 is uniformly formed on the uneven gas flow path portion and the occurrence of the non-formed portion is suppressed. In this way, it can be formed.
- the alloy plating layer 20 may be formed directly on the base material 10, but in order to improve the adhesion of the alloy plating layer 20, A modified layer may be provided therebetween.
- the modified layer can be appropriately formed according to the characteristics of the base material 10 and the alloy plating layer 20, but M1 constituting the alloy plating layer 20 from the viewpoint of improving the adhesion with the alloy plating layer 20.
- a layer containing the same element as M1 of the M2-M3 alloy is preferable.
- the modified layer is preferably a Ni-based layer containing Ni which is an element corresponding to M1, and such
- the Ni-based layer is formed by electroless reduction plating, a Ni—P plating layer and the like can be mentioned.
- the modified layer may be only one layer or two or more layers. In the case of two or more layers, the components constituting each layer may be different or the same. It may be a thing.
- the method for forming the modified layer is not particularly limited, but it can be formed by electrolytic plating, electroless plating, sputtering, or the like.
- the alloy plating layer 20 of the present embodiment is a plating layer in which the molar ratio of M1 to M2 (M1 / M2) is 0.005 to 0.5.
- the alloy plating layer 20 is preferably composed of an alloy having an amorphous-like structure as described above.
- the molar ratio of M1 to M2 (M1 / M2) is 0.005 to 0.5, preferably 0.008 to 0.44, and more preferably. Is 0.008 to 0.33.
- the obtained alloy plating coating material 100 is amorphous.
- High strength, high toughness, high corrosion resistance, excellent magnetic properties (high magnetic permeability, low coercive force), and excellent moldability, and an appropriate value for the molar ratio (M1 / M2) It is considered that the corrosion resistance is improved and the conductivity is further improved by adjusting to. Thereby, about the obtained alloy plating coating material 100, it can be set as the thing excellent in electroconductivity in addition to corrosion resistance.
- the alloy plating layer 20 to be formed is not particularly limited as a method in which the molar ratio of M1 to M2 (M1 / M2) is in the above range, but the alloy plating layer 20 is formed by electroless plating.
- a method of controlling plating conditions can be used.
- the electroless plating conditions include, for example, the above-described electroless alloy plating bath, pH 4.0 to 7.0, bath temperature 30 to 50 ° C., and immersion time 5 to 20 minutes. Conditions can be used.
- the alloy plating layer 20 preferably has a glass transition point. In this embodiment, when the alloy plating layer 20 has a glass transition point, the corrosion resistance and conductivity of the obtained alloy plating coating material 100 can be further improved.
- the temperature of the alloy plating layer 20 is gradually increased or decreased using a thermomechanical analyzer (TMA). Measure the endotherm and exotherm while gradually increasing or decreasing the temperature of the alloy plating layer 20 using a method of detecting the temperature when the coefficient of thermal expansion changes rapidly while using a differential scanning calorimeter (DSC).
- TMA thermomechanical analyzer
- DSC differential scanning calorimeter
- the glass transition point of the alloy plating layer 20 is not particularly limited, but is preferably 250 to 400 ° C., more preferably 300 to 350 ° C.
- the alloy plating layer 20 formed as the outermost layer is composed of an M1-M2-M3 alloy, and the molar ratio of M1 to M2 (M1 / M2) is 0.005. -0.5, both corrosion resistance and electrical conductivity can be improved. Therefore, the alloy plating coating material 100 of this embodiment is suitably used as an electrical contact material used for connectors, switches, printed wiring boards, and the like.
- an alloy plating coating material having an alloy plating layer formed on the surface As a method of manufacturing an alloy plating coating material having an alloy plating layer formed on the surface, a method of forming an amorphous alloy plating layer made of an amorphous alloy such as a nickel base alloy on a base material has been conventionally used. Yes. However, simply forming an amorphous alloy plating layer made of an amorphous alloy on the base material improves the corrosion resistance, but on the other hand, the conductivity becomes insufficient, and sufficient characteristics as an electrical contact material are obtained. There is a problem that can not be.
- the fuel cell separator when an alloy plating coating material is used as a fuel cell separator, high conductivity is required in addition to high corrosion resistance. That is, the fuel cell separator is required to have high corrosion resistance because it is exposed to a high temperature and acidic atmosphere in the fuel cell, and in addition, high conductivity is required to collect electrons generated in the electrode. .
- the M1-M2-M3 alloy alloy plating layer 20 formed as the outermost layer has a molar ratio of M1 to M2 (M1 / M2) of 0.
- M1 / M2 molar ratio of M1 to M2
- the plating layer By setting the plating layer to 0.005 to 0.5, that is, even if it is made of an amorphous material, the molar ratio of the elements constituting the M1-M2-M3 alloy is controlled to a predetermined value.
- a plated layer both corrosion resistance and conductivity can be improved, and it can be suitably used as a fuel cell separator.
- the alloy plating layer 20 of the M1-M2-M3 alloy formed as the outermost layer is made into the alloy plating layer having the above-described amorphous-like structure. Both corrosion resistance and conductivity can be improved, and it can be suitably used as a fuel cell separator.
- Ni Pd (molar ratio) in the plating bath which mixed the palladium plating bath and the nickel plating bath was 1.14: 1.0.
- Palladium salt An amount that results in 0.15% by weight of Pd in the palladium plating bath
- Reducing agent 1.8% by weight
- Complexing agent 0.63% by weight
- Complexing agent 2.4% by weight Water: 93.2% by weight pH: 5.2
- Example 2 The condition of the electroless plating treatment when forming the alloy plating layer 20 was changed to pH 6.0 at 38 ° C. for 8 minutes, and Ni—with a thickness of 80 nm was formed on the substrate 10 as the alloy plating layer 20.
- An alloy plating coating material 100 was obtained in the same manner as in Example 1 except that the Pd—P alloy layer was formed.
- Example 3 First, a stainless steel material (SUS316L) was prepared as the base material 10.
- the prepared base material 10 was electrolytically degreased in an alkaline aqueous solution in which a commercially available degreasing agent (Nippon Quaker Chemical Co., Ltd., Formula 618-TK2) was dissolved. Subsequently, the degreased substrate 10 was washed with water, then immersed in a 70 ° C. sulfuric acid aqueous solution (concentration 25% by weight) for 15 seconds and pickled, and then the palladium plating bath and nickel plating bath shown below were used.
- a commercially available degreasing agent Nippon Quaker Chemical Co., Ltd., Formula 618-TK2
- Ni—Pd—P alloy layer having a thickness of 40 nm was formed as the alloy plating layer 20 on the base material 10 to obtain an alloy plating coating material 100.
- Ni: Pd (molar ratio) in the plating bath which mixed the palladium plating bath and the nickel plating bath was 0.88: 1.0.
- reducing agent and complexing agent in the plating bath conventionally known compounds were used.
- the molar ratio (Ni / Pd) of M1 (Ni) to M2 (Pd) in the formed alloy plating layer 20 was 0.008.
- the alloy plating was performed in the same manner as in Example 3 except that a 40 nm thick Ni—Pd—P alloy layer was formed as the alloy plating layer 20 on the base material 10 by performing an electroless plating process under the condition of minutes. A coating material 100 was obtained.
- Ni: Pd (molar ratio) in the plating bath which mixed the palladium plating bath and the nickel plating bath was 1.88: 1.0.
- the amount of metal in the film was measured using the alloy plating coating material 100 obtained in Examples 3 and 5. Specifically, the alloy plating coating material 100 is cut into a size of 40 mm length and 40 mm width of the alloy plating film 20 and immersed in a 60% nitric acid aqueous solution (volume 10 ml) at 60 ° C. for 5 minutes to dissolve the alloy plating film 20.
- the alloy plating coating material 100 is taken out, adjusted to 100 ml by adding water to the aqueous solution in which the alloy plating film 20 is dissolved, and then the mass concentration (g / L) of ions (Ni, Pd, P) eluted in the aqueous solution was measured with an inductively coupled plasma emission spectrometer (ICPE-9000, manufactured by Shimadzu Corporation), and the molar ratio in the film was determined from the amount of metal obtained from the ICP measurement result and the dissolved plating layer surface area. Calculated. The results are shown in Table 1.
- Comparative Example 2 The stainless steel material (SUS316L) used in Example 3 described above was prepared, and evaluation described later was performed without forming the alloy plating layer 20 on the stainless steel material.
- the alloy plating was performed in the same manner as in Example 3 except that a 40 nm thick Ni—Pd—P alloy layer was formed as the alloy plating layer 20 on the base material 10 by performing an electroless plating process under the condition of minutes.
- a coating material 100 was obtained.
- the palladium salt, reducing agent, and complexing agent in the plating bath conventionally known compounds were used.
- Ni: Pd (molar ratio) in the plating bath which mixed the palladium plating bath and the nickel plating bath was 4.99: 1.0.
- Example 1 the corrosion resistance of the alloy plating coating material 100 obtained in Example 1 and Comparative Example 1 was evaluated. Specifically, the end surface of the alloy plating coating material 100 is masked with a polyimide tape so that an area of 35 mm in length and 20 mm in width is exposed and immersed in a 90 ° C. sulfuric acid aqueous solution (volume 80 ml, pH: 1.0) for 100 hours. Then, the alloy plating coating material 100 is taken out, and the mass concentration (g / L) of ions (Ni, Pd, P, Fe, Cr, Mo) eluted from the alloy plating coating material 100 into the sulfuric acid aqueous solution is inductively coupled plasma.
- g / L mass concentration
- Comparative Example 2 which is a stainless steel material (SUS316L) which is usually used as a material for a fuel cell separator is also immersed in a sulfuric acid aqueous solution and ions ( Corrosion resistance was evaluated by measuring the mass concentration (g / L) of Ni, Pd, P, Fe, Cr, and Mo). The results are shown in FIG. 3A. In addition, in the graph of FIG. 3A, the value of ion elution concentration (ppm) is shown.
- Example 1 10 ppm of metal was eluted.
- SUS316L Comparative Example 2 used as a material for a conventional fuel cell separator eluted 39 ppm of metal.
- Example 1 was able to effectively suppress elution of ions from the base material, and was confirmed to be excellent in corrosion resistance.
- FIG. 3A in Example 2, it was confirmed that ion elution from the base material can be effectively suppressed to the same extent as in Example 1 and excellent in corrosion resistance.
- Comparative Example 1 it was confirmed that 18 ppm of metal was eluted, and the amount of ions eluted from the base material was larger than that of Example 1, which was inferior in corrosion resistance. It was.
- Example 3 the corrosion resistance of the alloy plating coating material 100 obtained in Examples 3 and 4 and Comparative Example 3 was evaluated. Specifically, in Example 3, the end surface of the alloy plating coating material 100 was masked with a polyimide tape so that an area of 40 mm in length and 37 mm in width was exposed, and 90 ° C. sulfuric acid aqueous solution (volume 90 ml, pH: 3.0). ) For 100 hours, the alloy plating coating material 100 is taken out, and the mass concentration (g / L) of ions (Ni, Pd, P, Fe, Cr, Mo) eluted from the alloy plating coating material 100 into the sulfuric acid aqueous solution.
- g / L mass concentration
- Comparative Example 2 which is a stainless steel material (SUS316L) which is usually used as a material for a fuel cell separator is also immersed in a sulfuric acid aqueous solution and ions (Ni, Pd) eluted in the sulfuric acid aqueous solution.
- the corrosion resistance was evaluated by measuring the mass concentration (g / L) of P, Fe, Cr, Mo). The results are shown in FIG. 3B.
- concentration (ppm) is shown.
- the pH of the sulfuric acid used in the test was increased as compared with the above-described corrosion resistance evaluation (No. 1) (1.0 to 3. Therefore, the ion elution concentration (ppm) value was relatively low.
- Example 3B From the result of FIG. 3B, 0.062 ppm of metal eluted in Comparative Example 2, and 2.219 ppm of metal eluted in Comparative Example 3. In Example 3, 0.042 ppm of metal was eluted, and in Example 4, 0.023 ppm of metal was eluted. From the results shown in Table 1 and FIG. 3B, an alloy plating layer 20 having a molar ratio of M1 (Ni) to M2 (Pd) (Ni / Pd) of 0.005 to 0.5 was formed on the base material 10.
- Example 3 compared to SUS316L (Comparative Example 2) used as a material for a conventional fuel cell separator, elution of ions from the base material can be effectively suppressed, and the corrosion resistance is excellent. Was confirmed. On the other hand, from the results of FIG. 3B, it was confirmed that Comparative Example 3 was inferior in corrosion resistance because the amount of ions eluted from the base material was larger than in Examples 3 and 4.
- Example 3 the corrosion resistance of the alloy plating coating material 100 obtained in Example 5 and Comparative Example 2 was evaluated. Specifically, the end surface of the alloy plating coating material 100 is masked with a polyimide tape so that an area of 40 mm in length and 37 mm in width is exposed, and immersed in a 90 ° C. sulfuric acid aqueous solution (volume 90 ml, pH: 3.0) for 100 hours. Then, the alloy plating coating material 100 is taken out, and the mass concentration (g / L) of ions (Ni, Pd, P, Fe, Cr, Mo) eluted from the alloy plating coating material 100 into the sulfuric acid aqueous solution is inductively coupled plasma.
- g / L mass concentration
- Comparative Example 2 which is a stainless steel material (SUS316L) which is usually used as a material for a fuel cell separator is also immersed in a sulfuric acid aqueous solution and ions (Ni, Pd) eluted in the sulfuric acid aqueous solution.
- the corrosion resistance was evaluated by measuring the mass concentration (g / L) of P, Fe, Cr, Mo). The results are shown in FIG. 3C. In addition, in the graph of FIG. 3C, the value of ion elution concentration (ppm) is shown.
- Example 5 From the result of FIG. 3C, 0.88 ppm of metal eluted in Comparative Example 2, and 0.85 ppm of metal eluted in Example 5. From the results shown in Table 1 and FIG. 3C, an alloy plating layer 20 having a molar ratio of M1 (Ni) to M2 (Pd) (Ni / Pd) of 0.005 to 0.5 was formed on the substrate 10.
- SUS316L Comparative Example 2
- a measurement system as shown in FIG. 4 was formed using the alloy plating coating material 100 obtained in Example 1, and the contact resistance value was measured using the formed measurement system.
- 4 includes an alloy plating coating material 100, a carbon cloth 200 used as a gas diffusion layer substrate in a fuel cell separator, a copper electrode 300 coated with gold plating, a digital multimeter 400, and an ammeter. 500.
- the contact resistance value was measured by first processing the alloy plating coating material 100 into a size of 20 mm in width, 20 mm in length, and 1.27 mm in thickness, and as shown in FIG.
- FIG. 5 also shows the contact resistance values measured for SUS316L (Comparative Example 2) as comparison data.
- the contact resistance value of SUS316L (Comparative Example 2) was obtained by processing SUS316L into a size having a width of 20 mm, a length of 20 mm, and a thickness of 1.0 mm, and then measuring with the measurement system shown in FIG.
- Example 1 in any load value, the contact resistance value is lower than that of SUS316L (Comparative Example 2) used as the material of the conventional fuel cell separator and the like. The result was excellent.
- Example 3 in which an alloy plating layer 20 having a molar ratio (Ni / Pd) of M1 (Ni) to M2 (Pd) of 0.005 to 0.5 was formed on the base material 10 was obtained.
- the contact resistance value was lower than that of SUS316L (Comparative Example 2) used as a material for a conventional fuel cell separator, and the conductivity was excellent.
- Comparative Example 3 in which the molar ratio (Ni / Pd) of M1 (Ni) to M2 (Pd) in the alloy plating layer 20 was outside the range of 0.005 to 0.5 was carried out.
- the contact resistance value was slightly higher, resulting in slightly inferior conductivity.
- Example 6 First, a stainless steel material (SUS316L) was prepared as the base material 10. Next, the prepared base material 10 was immersed in an aqueous sulfuric acid solution having a sulfuric acid concentration of 25 vol.% Under the conditions of a temperature of 70 ° C. and an immersion time of 5 seconds, thereby obtaining a stainless steel plate having a passive film formed on the surface.
- SUS316L stainless steel material
- Example 7 A passive film was formed on the surface in the same manner as in Example 6 except that the prepared base material 10 was immersed in a sulfuric acid aqueous solution having a sulfuric acid concentration of 25% by volume under conditions of a temperature of 70 ° C. and an immersion time of 10 seconds. A stainless steel plate was obtained.
- Example 8 A passive film was formed on the surface in the same manner as in Example 6 except that the prepared base material 10 was immersed in a sulfuric acid aqueous solution having a sulfuric acid concentration of 25% by volume under conditions of a temperature of 70 ° C. and an immersion time of 15 seconds. A stainless steel plate was obtained.
- Example 9 A passive film was formed on the surface in the same manner as in Example 6 except that the prepared base material 10 was immersed in a sulfuric acid aqueous solution having a sulfuric acid concentration of 25% by volume under conditions of a temperature of 70 ° C. and an immersion time of 20 seconds. A stainless steel plate was obtained.
- the plating properties of the Ni—Pd—P alloy layer were evaluated for the alloy plating coating material 100 thus obtained.
- the surface of the alloy plating coating material 100 is measured with a fluorescent X-ray analyzer (manufactured by Rigaku Corporation, model number: ZSX100e) to determine the presence or absence of the Ni—Pd—P alloy.
- the plating property was evaluated by judging that the Ni—Pd—P alloy layer was well formed. The results are shown in Table 2.
- the Ni—Pd—P alloy was detected from the surface of the alloy plating coating materials 100 of Examples 6 to 9, and it was confirmed that the Ni—Pd—P alloy layer was formed satisfactorily.
- the adhesion of the Ni—Pd—P alloy layer was evaluated for the alloy plating coating materials 100 of Examples 6 to 9. Specifically, a peel test was performed by attaching an adhesive tape (Nichiban Co., Ltd., Ny stack strong type) to the Ni—Pd—P alloy layer of the alloy plating coating material 100, and then peeling it off. Then, Ni—Pd When the peeling state of the —P alloy layer was observed and no peeling was confirmed, the adhesion was evaluated by judging that the adhesion of the Ni—Pd—P alloy layer was good. The results are shown in Table 2. As a result, in the alloy plating coating material 100 of Examples 6 to 9, peeling of the Ni—Pd—P alloy layer was not confirmed, and it was confirmed that the adhesion of the Ni—Pd—P alloy layer was good. It was.
- the Cr / O value by the Auger electron spectroscopic analysis on the surface is 0.09 to 0.20, and the Cr / Fe value is 0.55 to 0.80.
- the passivating film in the range was formed, it was confirmed that the Ni—Pd—P alloy layer formed on the passivating film was excellent in plating properties and adhesion.
- the Cr / O value in the passive film of the stainless steel plate is 0.092 to 0.1987, and the Cr / Fe value is 0.5577 to 0.7918.
- the range of the Cr / O value by the Auger electron spectroscopic analysis on the surface is 0.09 to 0.20 and the Cr / Fe value is 0.55 to 0.80 on the stainless steel plate. If the passive film is formed, the Ni—Pd—P alloy layer formed on the passive film is considered to have excellent plating properties and adhesion.
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Abstract
Description
また、合金を構成する特定の元素の配合比が所定範囲から外れてしまった場合、アモルファス合金めっき層の耐食性が悪化することを見出した。例えば、燃料電池部材のように、腐食雰囲気下で長時間使用される場合には、経時で溶出した金属が、燃料電池の発電特性に悪影響を及ぼすことが懸念されるため、耐食性と導電性の両方を備えるめっき被覆材料が求められている。
本発明の合金めっき被覆材料において、前記合金めっき層は、アモルファスライクであることが好ましい。
本発明の合金めっき被覆材料において、前記合金めっき層は、X線回折装置を用いて微小角入射X線回折法により測定した際の回折プロファイルが、M1、M2及びM3のうち少なくとも一つの元素を含む結晶に由来する鋭いピークがない形状、及び/又はアモルファス構造に由来するハローを有する形状であることが好ましい。
本実施形態の合金めっき被覆材料100は、図1に示すように、基材10上に、M1-M2-M3合金(ただし、M1は、Ni、Fe、Co、Cu、Zn、およびSnから選択される少なくとも1つの元素、M2は、Pd、Re、Pt、Rh、Ag、およびRuから選択される少なくとも1つの元素、M3は、P、およびBから選択される少なくとも1つの元素である。)からなり、最表層を構成する合金めっき層20を備える。本実施形態では、合金めっき層20は、M2に対するM1のモル比(M1/M2)が0.005~0.5であるめっき層である。
基材10としては、特に限定されないが、鋼、ステンレス鋼、Al、Al合金、Ti、Ti合金、Cu、Cu合金、Ni、Ni合金などが挙げられるが、ステンレス鋼板が特に好ましい。
合金めっき層20は、合金めっき被覆材料100の耐食性および耐摩耗性を向上させ、さらに導電性を付与するために、最表層として形成されるめっき層であり、M1-M2-M3合金(ただし、M1は、Ni、Fe、Co、Cu、Zn、およびSnから選択される少なくとも1つの元素、M2は、Pd、Re、Pt、Rh、Ag、およびRuから選択される少なくとも1つの元素、M3は、P、およびBから選択される少なくとも1つの元素である。)により構成され、M2に対するM1のモル比(M1/M2)が0.005~0.5である。
さらに、本実施形態に係る合金めっき被覆材料100によれば、最表層として形成されるM1-M2-M3合金の合金めっき層20を、上述したアモルファスライクな構造を有する合金めっき層とすることにより、耐食性および導電性をいずれも向上させることができ、燃料電池用セパレータとして好適に用いることができる。
まず、基材10としてステンレス鋼材(SUS316L)を準備した。次いで、準備した基材10に対し、下記に示すパラジウムめっき浴と、ニッケルめっき浴とを、パラジウムめっき浴:ニッケルめっき浴=5.7:1(体積比)の割合で混合しためっき浴を用いて、38℃、4分間の条件で、無電解めっき処理を施すことにより、基材10上に、合金めっき層20として厚さ40nmのNi-Pd-P合金層を形成し、合金めっき被覆材料100を得た。なお、めっき浴中におけるパラジウム塩、還元剤、および錯化剤については、従来公知の化合物を用いた。また、パラジウムめっき浴と、ニッケルめっき浴とを混合しためっき浴中におけるNi:Pd(モル比)は、1.14:1.0であった。
<パラジウムめっき浴>
パラジウム塩:パラジウムめっき浴中におけるPd量が0.15重量%となる量
還元剤:1.8重量%
錯化剤:0.63重量%
水:97.2重量%
pH:5.5
<ニッケルめっき浴>
ニッケル塩(塩化ニッケル):1.8重量%
還元剤(次亜燐酸ソーダ):2.4重量%
錯化剤:2.4重量%
水:93.2重量%
pH:5.2
合金めっき層20を形成する際の、無電解めっき処理の条件を、38℃、8分間、pH:6.0に変更し、基材10上に、合金めっき層20として厚さ80nmのNi-Pd-P合金層を形成した以外は、実施例1と同様にして合金めっき被覆材料100を得た。
合金めっき層20を形成する際の、無電解めっき処理に用いるめっき浴として、パラジウムめっき浴と、ニッケルめっき浴とを、パラジウムめっき浴:ニッケルめっき浴=1:2(体積比)の割合で混合しためっき浴を用いた以外は、実施例1と同様にして合金めっき被覆材料100を得た。なお、パラジウムめっき浴と、ニッケルめっき浴とを混合しためっき浴中におけるNi:Pd(モル比)は、0.1:1.0であった。
まず、基材10としてステンレス鋼材(SUS316L)を準備した。そして、準備した基材10について、市販の脱脂剤(日本クエーカーケミカル社製、フォーミュラー 618-TK2)を溶解させたアルカリ水溶液中で電解脱脂した。続いて、脱脂した基材10を水洗し、その後、70℃の硫酸水溶液(濃度25重量%)に15秒間浸漬して酸洗した後、下記に示すパラジウムめっき浴と、ニッケルめっき浴とを、パラジウムめっき浴:ニッケルめっき浴=5.67:1.0(体積比)の割合で混合しためっき浴を用いて、37℃、pH5.95、2分間の条件で、無電解めっき処理を施すことにより、基材10上に、合金めっき層20として厚さ40nmのNi-Pd-P合金層を形成し、合金めっき被覆材料100を得た。また、パラジウムめっき浴と、ニッケルめっき浴とを混合しためっき浴中におけるNi:Pd(モル比)は、0.88:1.0であった。めっき浴中における還元剤、および錯化剤については、従来公知の化合物を用いた。また、形成された合金めっき層20におけるM2(Pd)に対するM1(Ni)のモル比(Ni/Pd)は、0.008であった。
<パラジウムめっき浴>
パラジウム塩(塩化パラジウム):0.28重量%
還元剤:1.80重量%
錯化剤:0.63重量%
水:97.3重量%
pH:6.0
<ニッケルめっき浴>
ニッケル塩(硫酸ニッケル):2.0重量%
還元剤:2.6重量%
錯化剤:2.6重量%
水:92.8重量%
pH:4.3
実施例3に示すパラジウムめっき浴と、ニッケルめっき浴とを、パラジウムめっき浴:ニッケルめっき浴=3:1(体積比)の割合で混合しためっき浴を用いて、37℃、pH6.34、12分間の条件で、無電解めっき処理を施すことにより、基材10上に、合金めっき層20として厚さ40nmのNi-Pd-P合金層を形成した以外は、実施例3と同様に合金めっき被覆材料100を得た。また、パラジウムめっき浴と、ニッケルめっき浴とを混合しためっき浴中におけるNi:Pd(モル比)は、1.88:1.0であった。
実施例3に示すパラジウムめっき浴と、ニッケルめっき浴とを、パラジウムめっき浴:ニッケルめっき浴=1.86:1.0(体積比)の割合で混合しためっき浴を用いて、55℃、pH6.7、5分間の条件で、無電解めっき処理を施すことにより、基材10上に、合金めっき層20として厚さ40nmのNi-Pd-P合金層を形成した以外は、実施例3と同様に合金めっき被覆材料100を得た。また、パラジウムめっき浴と、ニッケルめっき浴とを混合しためっき浴中におけるNi:Pd(モル比)は、2.68:1.0であった。なお、めっき浴中における還元剤、および錯化剤については、従来公知の化合物を用いた。また、形成された合金めっき層20におけるM2(Pd)に対するM1(Ni)のモル比(Ni/Pd)は、0.44であった。
実施例3,5において得られた合金めっき被覆材料100を用いて、皮膜中の金属量を測定した。具体的には、合金めっき被覆材料100を合金めっき皮膜20の縦40mm、横40mmのサイズに切り出し、60℃の60%硝酸水溶液(体積10ml)に5分間浸漬させて合金めっき皮膜20を溶解し、合金めっき被覆材料100を取り出し、合金めっき皮膜20を溶解した水溶液に水を加えて100mlに調整した後、前記水溶液中に溶出したイオン(Ni、Pd、P)の質量濃度(g/L)を誘導結合プラズマ発光分析装置(島津製作所社製、ICPE-9000)により測定し、測定結果を得たICPの測定結果から得られた金属量と、溶解しためっき層表面積から皮膜中のモル比を算出した。結果を表1に示す。
上述した実施例3で用いたステンレス鋼材(SUS316L)を準備し、このステンレス鋼材上に合金めっき層20を形成することなく、後述する評価を行った。
実施例3に示すパラジウムめっき浴と、ニッケルめっき浴とを、パラジウムめっき浴:ニッケルめっき浴=1:1(体積比)の割合で混合しためっき浴を用いて、55℃、pH7.3、5分間の条件で、無電解めっき処理を施すことにより、基材10上に、合金めっき層20として厚さ40nmのNi-Pd-P合金層を形成した以外は、実施例3と同様に合金めっき被覆材料100を得た。なお、めっき浴中におけるパラジウム塩、還元剤、および錯化剤については、従来公知の化合物を用いた。また、パラジウムめっき浴と、ニッケルめっき浴とを混合しためっき浴中におけるNi:Pd(モル比)は、4.99:1.0であった。
実施例3,4および比較例2,3において得られた合金めっき被覆材料100について、X線回折装置(リガク社製、型番:RINT-2500)を用いて微小角入射X線回折法によりX線回折測定を行った。なお、実施例3の測定結果は図2Bに、実施例4の測定結果は図2Cにそれぞれ示す。結果は、実施例3,4はM1~M3金属のピークが見られる位置に結晶に由来するピークが見られず、一方、比較例2は、基材中の結晶に由来する考えられるピークが見られた。
次いで、実施例1および比較例1において得られた合金めっき被覆材料100に対し、耐食性の評価を行った。具体的には、合金めっき被覆材料100を縦35mm、横20mmの面積が露出するようにポリイミドテープで端面をマスキングし、90℃の硫酸水溶液(体積80ml、pH:1.0)に100時間浸漬させた後、合金めっき被覆材料100を取り出し、合金めっき被覆材料100から硫酸水溶液中に溶出したイオン(Ni、Pd、P、Fe、Cr、Mo)の質量濃度(g/L)を誘導結合プラズマ発光分析装置(島津製作所社製、ICPE-9000)により測定することにより行った。また、比較として、併せて、燃料電池用セパレータの材料として通常用いられているステンレス鋼材(SUS316L)である比較例2についても、同様に、硫酸水溶液に浸漬させ、硫酸水溶液中に溶出したイオン(Ni、Pd、P、Fe、Cr、Mo)の質量濃度(g/L)を測定することで、耐食性の評価を行った。結果を図3Aに示す。なお、図3Aのグラフにおいては、イオン溶出濃度(ppm)の値を示す。
次いで、実施例3,4および比較例3において得られた合金めっき被覆材料100に対し、耐食性の評価を行った。実施例3は、具体的には、合金めっき被覆材料100を縦40mm、横37mmの面積が露出するようにポリイミドテープで端面をマスキングし、90℃の硫酸水溶液(体積90ml、pH:3.0)に100時間浸漬させた後、合金めっき被覆材料100を取り出し、合金めっき被覆材料100から硫酸水溶液中に溶出したイオン(Ni、Pd、P、Fe、Cr、Mo)の質量濃度(g/L)を誘導結合プラズマ発光分析装置(島津製作所社製、ICPE-9000)により測定することにより行った。また、比較として、燃料電池用セパレータの材料として通常用いられているステンレス鋼材(SUS316L)である比較例2についても、同様に、硫酸水溶液に浸漬させ、硫酸水溶液中に溶出したイオン(Ni、Pd、P、Fe、Cr、Mo)の質量濃度(g/L)を測定することで、耐食性の評価を行った。結果を図3Bに示す。なお、図3Bのグラフにおいては、イオン溶出濃度(ppm)の値を示す。耐食性の評価(その2)及び後述する耐食性の評価(その3)では、上述した耐食性の評価(その1)と比較して、試験に用いた硫酸のpHを高くした(1.0から3.0に変更した)ため、イオン溶出濃度(ppm)の値は相対的に低い値となった。
表1および図3Bの結果より、基材10上に、M2(Pd)に対するM1(Ni)のモル比(Ni/Pd)が0.005~0.5である合金めっき層20を形成した実施例3においては、従来の燃料電池用セパレータの材料などとして用いられているSUS316L(比較例2)と比較して、基材からのイオンの溶出を有効に抑制することができ、耐食性に優れることが確認された。一方、図3Bの結果より、比較例3は、実施例3,実施例4と比較して、基材からのイオンの溶出量が多くなっており、耐食性に劣ることが確認された。
次いで、実施例5および比較例2において得られた合金めっき被覆材料100に対し、耐食性の評価を行った。具体的には、合金めっき被覆材料100を縦40mm、横37mmの面積が露出するようにポリイミドテープで端面をマスキングし、90℃の硫酸水溶液(体積90ml、pH:3.0)に100時間浸漬させた後、合金めっき被覆材料100を取り出し、合金めっき被覆材料100から硫酸水溶液中に溶出したイオン(Ni、Pd、P、Fe、Cr、Mo)の質量濃度(g/L)を誘導結合プラズマ発光分析装置(島津製作所社製、ICPE-9000)により測定することにより行った。また、比較として、燃料電池用セパレータの材料として通常用いられているステンレス鋼材(SUS316L)である比較例2についても、同様に、硫酸水溶液に浸漬させ、硫酸水溶液中に溶出したイオン(Ni、Pd、P、Fe、Cr、Mo)の質量濃度(g/L)を測定することで、耐食性の評価を行った。結果を図3Cに示す。なお、図3Cのグラフにおいては、イオン溶出濃度(ppm)の値を示す。
表1および図3Cの結果より、基材10上に、M2(Pd)に対するM1(Ni)のモル比(Ni/Pd)が0.005~0.5である合金めっき層20を形成した実施例5においては、従来の燃料電池用セパレータの材料などとして用いられているSUS316L(比較例2)と比較して、基材からのイオンの溶出を有効に抑制することができ、耐食性に優れることが確認された。
次いで、実施例1において得られた合金めっき被覆材料100を用いて、図4に示すような測定系を形成し、形成した測定系を用いて、接触抵抗値の測定を行った。なお、図4に示す測定系は、合金めっき被覆材料100、燃料電池用セパレータにおいてガス拡散層基材として用いられるカーボンクロス200、金めっき被覆された銅電極300、デジタルマルチメータ400、および電流計500によって構成される。接触抵抗値の測定は、具体的には、まず、合金めっき被覆材料100を幅20mm、長さ20mm、厚さ1.27mmの大きさに加工し、図4に示すように、カーボンクロス200(東レ社製、品番:TGP-H-090)を介して、金めっき被覆された銅電極300によって両側から挟んで固定することで、図4に示す測定系を形成した。次いで、銅電極300に一定の荷重を加えながら、荷重5~20(kg/cm2)の範囲において、抵抗計(日置電機社製、ミリオームハイテスタ3540)を用いて、試験片を挟んだ上下のカーボンクロス200間の接触抵抗値を測定した。測定結果を図5に示す。
次いで、実施例3~5および比較例2,3において得られた合金めっき被覆材料100を用いて、図4に示すような測定系からカーボンクロス200を取り除いた測定系を用いて、幅20mm、長さ20mm、厚さ1.27mmの大きさに加工した合金めっき被覆材料100を、荷重1MPa(10.2(kg/cm2))にて、抵抗計(日置電機社製、ミリオームハイテスタ3540)を用いて、試験片を挟んだ上下の銅電極300間の接触抵抗値を測定した。測定結果を表1に示す。
まず、基材10としてステンレス鋼材(SUS316L)を準備した。次いで、準備した基材10を、硫酸濃度25体積%の硫酸水溶液に、温度70℃、浸漬時間5秒の条件で浸漬させることにより、表面に不動態膜が形成されたステンレス鋼板を得た。
準備した基材10を、硫酸濃度25体積%の硫酸水溶液に、温度70℃、浸漬時間10秒の条件で浸漬させること以外は、実施例6と同様にして表面に不動態膜が形成されたステンレス鋼板を得た。
準備した基材10を、硫酸濃度25体積%の硫酸水溶液に、温度70℃、浸漬時間15秒の条件で浸漬させること以外は、実施例6と同様にして表面に不動態膜が形成されたステンレス鋼板を得た。
準備した基材10を、硫酸濃度25体積%の硫酸水溶液に、温度70℃、浸漬時間20秒の条件で浸漬させること以外は、実施例6と同様にして表面に不動態膜が形成されたステンレス鋼板を得た。
10…基材
20…合金めっき層
Claims (5)
- 基材と、
前記基材上に形成されることで最表層を構成し、M1-M2-M3合金(ただし、M1は、Ni、Fe、Co、Cu、Zn、およびSnから選択される少なくとも1つの元素、M2は、Pd、Re、Pt、Rh、Ag、およびRuから選択される少なくとも1つの元素、M3は、P、およびBから選択される少なくとも1つの元素である。)からなる合金めっき層と、を備え、
前記合金めっき層は、M2に対するM1のモル比(M1/M2)が0.005~0.5であることを特徴とする合金めっき被覆材料。 - 前記合金めっき層は、ガラス転移点を有することを特徴とする請求項1に記載の合金めっき被覆材料。
- 前記合金めっき層は、アモルファスライクであることを特徴とする請求項1又は2に記載の合金めっき被覆材料。
- 前記合金めっき層は、X線回折装置を用いて微小角入射X線回折法により測定した際の回折プロファイルが、M1、M2及びM3のうち少なくとも一つの元素を含む結晶に由来する鋭いピークがない形状、及び/又はアモルファス構造に由来するハローを有する形状であることを特徴とする請求項1~3のいずれか一項に記載の合金めっき被覆材料。
- 基材上に、最表層を構成するように、M1-M2-M3合金(ただし、M1は、Ni、Fe、Co、Cu、Zn、およびSnから選択される少なくとも1つの元素、M2は、Pd、Re、Pt、Rh、Ag、およびRuから選択される少なくとも1つの元素、M3は、P、およびBから選択される少なくとも1つの元素である。)からなる合金めっき層を、無電解めっきにより形成する工程を有し、
前記合金めっき層が、M2に対するM1のモル比(M1/M2)が0.005~0.5となるように形成されることを特徴とする合金めっき被覆材料の製造方法。
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KR101996597B1 (ko) * | 2017-10-13 | 2019-07-31 | 주식회사 유유제약 | 두타스테리드와 타다라필을 용해시킨 경구용 캡슐 제형의 복합제제 |
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CN109672064A (zh) * | 2018-11-13 | 2019-04-23 | 云南先导新材料有限公司 | 一种钯合金复合丝电刷材料及其制备方法 |
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