EP4567161A1 - Coated substrate - Google Patents

Coated substrate Download PDF

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Publication number
EP4567161A1
EP4567161A1 EP23849917.2A EP23849917A EP4567161A1 EP 4567161 A1 EP4567161 A1 EP 4567161A1 EP 23849917 A EP23849917 A EP 23849917A EP 4567161 A1 EP4567161 A1 EP 4567161A1
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EP
European Patent Office
Prior art keywords
film
atm
substrate
bath liquid
coated substrate
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Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
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EP23849917.2A
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German (de)
English (en)
French (fr)
Inventor
Tomoki MURATA
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Niterra Co Ltd
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Niterra Co Ltd
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Publication of EP4567161A1 publication Critical patent/EP4567161A1/en
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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
    • C—CHEMISTRY; METALLURGY
    • C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
    • C23C—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THE SURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTION; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL
    • C23C26/00—Coating not provided for in groups C23C2/00 - C23C24/00
    • 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

Definitions

  • the present disclosure relates to a coated substrate.
  • Patent Literatures 1 to 4 disclose coated substrates having metal oxide films.
  • a wet film-formation method is employed.
  • a dry film-formation method has been employed so as to perform thickness control in accordance with complex substrate shapes.
  • the present disclosure was made in view of the above-described circumstances, and an object is to provide a novel coated substrate which can be applied to various fields and can be mass produced.
  • the present disclosure can be realized as the following modes.
  • a coated substrate 1 includes a substrate 5 coated with a film 3.
  • the thickness of the film 3 is 1 nm or greater and less than 800 nm.
  • X-ray photoelectron spectroscopic measurement of the film 3 shows that the percent element composition of C (carbon) is 0.1 atm% or greater and less than 20 atm%, and the total percent element composition of a metal element and O (oxygen) is 70 atm% or greater.
  • the relative density of the film 3 is 90% or greater.
  • the film 3 is amorphous.
  • the substrate 5 is preferably formed of a material which is electrically conductive and can function as a negative electrode 7 (cathode).
  • the film 3 can be easily formed on that portion by a manufacturing method described below.
  • a surface portion of the substrate 5 may be formed of a material which is electrically conductive and can function as the negative electrode 7.
  • the entire substrate 5 may be formed of a material which can function as the negative electrode 7.
  • preferred materials which can serve as the negative electrode 7 include an iron-based alloy and carbon.
  • An example of preferred iron-based alloys is one or more types of alloys selected from Fe-Ni-Cr alloy (stainless steel), Fe-Ni alloy (permalloy), Fe-Si alloy (silicon iron), Fe-Si-Al alloy (Sendust), Fe-Ni-Mo (supermalloy), Fe-Co alloy (permendur), and Fe-C-B alloy (amorphous).
  • the thickness of the film 3 is 1 nm or greater, preferably 10 nm or greater, more preferably 50 nm or greater. Meanwhile, from the viewpoint of enabling the film 3 to endure stresses generated therein and securing adhesion to the substrate 5, the thickness of the film 3 is less than 800 nm, preferably 500 nm or less, more preferably 200 nm or less. From theses viewpoints, the thickness of the film 3 is 1 nm or greater and less than 800 nm, preferably 10 nm or greater and 500 nm or less, more preferably 50 nm or greater and 200 nm or less.
  • the film 3 satisfies the requirement regarding the thickness when the thickness of at least a portion of the film 3 falls within the above-described range.
  • the thickness of the film 3 can be obtained through observation under an FIB-SEM.
  • the percent element composition of C (carbon) determined through measurement by x-ray photoelectron spectroscopy (XPS method) is 0.1 atm% or greater, preferably 0.5 atm% or greater, more preferably 1 atm% or greater. Meanwhile, from the viewpoint of enabling the film 3 to sufficiently function as an inorganic film, the percent element composition of C (carbon) is less than 20 atm%, preferably 15 atm% or less, more preferably 10 atm% or less.
  • the percent element composition of C (carbon) is 0.1 atm% or greater and less than 20 atm%, preferably 0.5 atm% or greater and 15 atm% or less, more preferably 1 atm% or greater and 10 atm% or less.
  • the film 3 satisfies the requirement regarding the percent element composition of C (carbon) when the composition of at least a portion of the film 3 falls within the above-described range.
  • the composition analysis by the x-ray photoelectron spectroscopy can be performed by using an x-ray photoelectron spectrometer.
  • the measurement can be performed by scanning a cross section under the following measurement conditions: K-alpha rays of aluminum being used as an x-ray source, the beam diameter being set to 100 ⁇ m, and the x-ray incident angle in relation to a surface to be analyzed being set to 45°.
  • the total percent element composition of the metal element and O (oxygen) of the film 3 determined through measurement by the x-ray photoelectron spectroscopy (XPS method) is 70 atm% or greater, preferably 80 atm% or greater, more preferably 90 atm% or greater.
  • the upper limit of the total percent element composition of the metal element and O (oxygen) is a value obtained by subtracting the percent element composition (atm%) of C (carbon) from 100 atm%. In the case where the composition of the film 3 is not uniform, the film 3 satisfies the requirement regarding the total percent element composition of the metal element and O (oxygen) when the composition of at least a portion of the film 3 falls within the above-described range.
  • the relative density of the film 3 is 90% or greater, preferably 95% or greater, more preferably 98% or greater.
  • the relative density of the film 3 may be 100%.
  • the relative density of the film 3 is obtained by the following method.
  • a TEM image of a cross section of the film 3 obtained by cutting the film 3 in the film-thickness direction is obtained.
  • the area of pores in a field of view of 300 nm (vertical dimension) ⁇ 1000 nm (horizontal dimension) is measured.
  • the relative density (%) is obtained in accordance with the following expression (1).
  • the average of the relative densities of 10 fields of view is the relative density of the film 3.
  • measurement is performed in fields of view determined in accordance with the thickness of the film 3.
  • Relative density % S 1 ⁇ S 2 / S 1 ⁇ 100 (In the expression, S1 is the area (nm 2 ) of the field of view of 300 nm (vertical dimension) ⁇ 1000 nm (horizontal dimension), and S2 is the total area (nm 2 ) of pores in the field of view of 300 nm (vertical dimension) ⁇ 1000 nm (horizontal dimension))
  • the film 3 is amorphous.
  • the fact that the film 3 is amorphous can be confirmed by using a TEM image. Since the film 3 is amorphous, it is expected that crystal grains do not come off and peculiar functions (such as smoothing the outermost surface by uniform film growth) are exhibited.
  • the percent element composition of the halogen element as determined through measurement of the film 3 by x-ray photoelectron spectroscopy is preferably 0.1 atm% or greater, more preferably 0.3 atm% or greater, further preferably 0.5 atm% or greater.
  • the upper limit value of the percent element composition of the halogen element is 3 atm% or less.
  • the oxide film present on the surface of the substrate 5 is removed by the action of the halogen element, and the film 3 comes into direct contact with the substrate 5. As a result, the adhesion between the substrate 5 and the film 3 is secured.
  • the metal element is preferably at least one or more metal elements selected from the group consisting of Al (aluminum), Ti (titanium), Mo (molybdenum), Cr (chromium), Mn (manganese), Fe (iron), Co (cobalt), Ni (nickel), Zr (zirconium), V (vanadium), W (tungsten), Ta (tantalum), Nb (niobium), and Sn (tin).
  • the preferred manufacturing method is a method for manufacturing the coated substrate 1 by using a bath liquid 2 containing an organic solvent.
  • the water content of the bath liquid 2 is less than 1 mass% and the bath liquid 2 contains at least one or more types of metal elements and at least one or more types of halogen elements.
  • the bath liquid 2 contains an organic solvent.
  • the water content of the bath liquid 2 is rendered less than 1 mass%.
  • the water content is preferably less than 0.5 mass%, more preferably less than 0.1 mass%.
  • the water content may be 0 mass%.
  • the water content of the bath liquid 2 can be obtained by GC-MS analysis.
  • the bath liquid 2 contains at least one or more types of metal elements. No particular limitation is imposed on the metal elements. From the viewpoint of causing the film 3 to function as a high quality protection film for the substrate 5, the metal element is preferably at least one or more metal elements selected from the group consisting of Al (aluminum), Ti (titanium), Mo (molybdenum), Cr (chromium), Mn (manganese), Fe (iron), Co (cobalt), Ni (nickel), Zr (zirconium), V (vanadium), W (tungsten), Ta (tantalum), Nb (niobium), and Sn (tin). In the manufacturing method of the present disclosure, an oxide film depending on the metal element(s) in the bath liquid 2 is formed as the film 3.
  • the metal element(s) contained in the bath liquid 2 may be supplied as a result of elution of the positive electrode 6 (anode).
  • the metal element(s) elutes from the positive electrode 6 into the bath liquid 2
  • control of film formation speed becomes easy, and continuous and stable formation of films on a plurality of substrates 5 becomes possible.
  • the metal element(s) is supplied to the bath liquid 2 as a result of elution of the positive electrode 6, at least one or more types of electrodes selected from an electrode of Al, an electrode of Ti, and an electrode of Mo are preferably used as the positive electrode 6.
  • the metal element(s) in the bath liquid 2 may be supplied from a metal alkoxide and/or an inorganic metal compound.
  • the metal element(s) is supplied as a result of dissolution of a metal alkoxide and/or an inorganic metal compound, it is possible to cope with an element which is difficult to supply by eluting the positive electrode 6 (anode). Also, in this case, it becomes possible to perform film formation in which composition ratios are controlled by combining a plurality of metal elements.
  • metal alkoxide examples include an aluminum alkoxide, a titanium alkoxide, and a molybdenum alkoxide.
  • Examples of the aluminum alkoxide include an aluminum trialkoxide.
  • Examples of the aluminum trialkoxide include aluminum tripropoxides (e.g., aluminum triisopropoxide and aluminum tri-n-propoxide), aluminum triethoxide, aluminum tributoxides (e.g., aluminum tri-sec-butoxide and aluminum tri-n-butoxide).
  • titanium alkoxide examples include a titanium trialkoxide, a titanium tetraalkoxide, and a titanium tetraalkoxide is preferred.
  • titanium tetraalkoxide examples include titanium tetrapropoxides (e.g., titanium tetraisopropoxide and titanium tetra-n-propoxide), titanium tetramethoxide, titanium tetraethoxide, titanium tetrabutoxides (e.g., titanium tetraisobutoxide and titanium tetra-n-butoxide), titanium tetrapentoxides, titanium tetrahexoxides, and titanium tetra (2-ethylhexoxide).
  • titanium tetrapropoxides e.g., titanium tetraisopropoxide and titanium tetra-n-propoxide
  • titanium tetramethoxide titanium tetraethoxide
  • Examples of the inorganic metal compound include aluminum chloride, aluminum bromide, aluminum iodide, and titanium iodide.
  • the metal element concentration of the bath liquid 2 is preferably 1 ppm or greater and 100 ppm or less, more preferably 3 ppm or greater and 10 ppm or less, further preferably 4 ppm or greater and 6 ppm or less.
  • ppm means "parts per million” and "mg/L.”
  • the above-described metal element concentration means the total concentration with respect to the plurality of metal elements.
  • the metal element concentration of the bath liquid 2 can be measured by ICP-MS analysis.
  • the bath liquid 2 contains at least one or more types of halogen elements. Since the bath liquid 2 contains a halogen element(s), film formation is performed at a practical speed, and the film 3 is likely to become homogeneous. No particular limitation is imposed on the halogen element. From the viewpoint of enabling prompt progress of organic electrochemical reactions and causing the film 3 to function as a high quality protection film for the substrate 5, the halogen element(s) is preferably at least one or more halogen elements selected from the group consisting of Cl (chlorine), Br (bromine), and I (iodine).
  • the halogen element concentration of the bath liquid 2 is preferably 1 ppm or greater and 20000 ppm or less, more preferably 5 ppm or greater and 2000 ppm or less, further preferably 10 ppm or greater and 100 ppm or less.
  • ppm means "parts per million” and "mg/L.”
  • the halogen element concentration of the bath liquid 2 can be obtained from the amount of a halogen element(s) added at the time of making-up of the electrolytic bath or by ICP-MS analysis.
  • the solvent preferably contains at least one or more types of solvents selected from the group consisting of ketones and nitriles.
  • the solvent contains a ketone and/or a nitrile, it is supposed that a condensation reaction occurs on the electrode surface (cathode surface) and electrodeposition becomes possible.
  • the solvent contains a ketone, conceivably, ketoenol tautomerism occurs in the presence of halogen, and the reactivity of the bath liquid 2 is enhanced.
  • ketone examples include acetone, methyl ethyl ketone (MEK), 1-hexanone, 2-hexanone, 4-heptanone, 2-heptanone (methyl amyl ketone), 1-octanone, 2-octanone, 1-nonanone, 2-nonanone, diisobutyl ketone, methyl isobutyl ketone, acetylacetone, acetonylacetone, phenylacetone, acetophenone, methyl naphthyl ketone, cyclohexanone (CHN), and methylcyclohexanone.
  • acetone and methyl ethyl ketone are preferred, because the film 3 is formed particularly satisfactorily.
  • Nitrile is an organic solvent which contains a nitrile group (-CN) in its structure.
  • nitrile include acetonitrile, propionitrile, valeronitrile, and butyronitrile. Among these, acetonitrile is preferred, because the film 3 is formed particularly satisfactorily.
  • a film 3 is formed on the substrate 5, which serves as the negative electrode 7.
  • the positive electrode 6 and the negative electrode 7 are immersed into the bath liquid 2, and a potential gradient is generated between the two electrodes.
  • any of known electrically conductive substrates may be used as the positive electrode 6.
  • the metal element(s) in the bath liquid 2 is supplied as a result of elution of the positive electrode 6, at least one or more types of electrodes selected from an electrode of Al, an electrode of Ti, and an electrode of Mo are preferably used as the positive electrode 6.
  • the positive electrode 6 may be foil like, plate like, foam like, nonwoven fabric like, mesh like, felt like, or expanded metal like.
  • the positive electrode 6 and the negative electrode 7 are preferably disposed to face each other.
  • the positive electrode 6 and the negative electrode 7 are connected to a DC power supply, which can generate a potential gradient between the positive electrode 6 and the negative electrode 7.
  • a voltage for example, constant voltage
  • the power supply connected to the positive electrode 6 and the negative electrode 7.
  • the potential gradient generated between the two electrodes is preferably 10 V or higher and 300 V or lower, more preferably 20 V or higher and 100 V or lower, further preferably 60 V or higher and 80 V or lower.
  • the application time is, for example, preferably 10 seconds or longer and 300 seconds or shorter, more preferably 30 seconds or longer and 240 seconds or shorter, further preferably 60 seconds or longer and 180 seconds or shorter.
  • the voltage is not required to be a constant voltage and the magnitude of the voltage may be changed.
  • the amount of carbon in the film 3 may be reduced by means of heat treatment and/or light irradiation.
  • the amount of carbon in the film 3 by means of heat treatment and/or light irradiation, it is possible to control the purity of the film 3 as an inorganic oxide film.
  • the treatment temperature of the heat treatment is preferably 100°C or higher and 1000°C or lower, more preferably 300°C or higher and 800°C or lower, further preferably 500°C or higher and 600°C or lower.
  • the treatment time of the heat treatment is preferably 1 minute or longer and 60 minutes or shorter, more preferably 5 minutes or longer and 45 minutes or shorter, further preferably 10 minutes or longer and 30 minutes or shorter.
  • the wavelength of light used for light irradiation is preferably 250 nm or longer and 1100 nm or shorter, more preferably 300 nm or longer and 800 nm or shorter, further preferably 400 nm or longer and 500 nm or shorter.
  • the light irradiation time is preferably 3 seconds or longer and 120 seconds or shorter, more preferably 5 seconds or longer and 60 seconds or shorter, further preferably 10 seconds or longer and 30 seconds or shorter.
  • the novel coated substrate 1 which can be applied to various fields and can be mass produced.
  • the coated substrate 1 of the present embodiment can be formed without use of an expensive material or by using only a small amount of an expensive material. Therefore, the coated substrate 1 is advantageous in terms of cost.
  • the coated substrate 1 of the present embodiment since post treatments, such as heat treatment and light irradiation, are not necessarily needed for formation of the film 3, it is possible to expand the choices of the material and shape of the substrate 5.
  • measurement conditions of XPS x-ray photoelectron spectroscopy
  • Example 1 (solvent: MEK, positive electrode 6: aluminum)
  • the film formation apparatus 11 shown in FIG. 1 was used.
  • An aluminum wire was used as the positive electrode 6.
  • a stainless plate was used as the negative electrode 7.
  • the negative electrode 7 is a substrate 5 on which a film 3 is to be formed.
  • Methyl ethyl ketone (MEK) was used as the solvent of the bath liquid 2.
  • Iodine (halogen) was dissolved in the bath liquid 2 at a concentration of 600 ppm.
  • the percent element composition of carbon in the film 3 was 5.8 atm%, and the total percent element composition of aluminum and oxygen was 93.9 atm%.
  • the percent element composition of iodine in this film 3 was less than 0.1 atm% (lower measurement limit).
  • the relative density of the film 3 determined by the following method was 100%.
  • the relative density of the film 3 was determined as follows. A TEM image was obtained from a cross section of the film 3 obtained by cutting the film 3 in the film-thickness direction. The area of pores was measured in a field of view of 300 nm (vertical dimension) ⁇ 1000 nm (horizontal dimension). The relative density (%) was obtained in accordance with the following expression (1). The average of the relative densities of 10 fields of view is the relative density of the film 3. Notably, in the case where the thickness of the film 3 is smaller than the vertical size of 300 nm, measurement is performed in fields of view determined in accordance with the thickness of the film 3.
  • Relative density % S 1 ⁇ S 2 / S 1 ⁇ 100 (In the expression, S1 is the area (nm 2 ) of the field of view of 300 nm (vertical dimension) ⁇ 1000 nm (horizontal dimension), and S2 is the total area (nm 2 ) of pores in the field of view of 300 nm (vertical dimension) ⁇ 1000 nm (horizontal dimension))
  • the percent element composition of carbon in the film 3 was 6.5 atm%, and the total percent element composition of aluminum and oxygen was 93.3 atm%.
  • the percent element composition of iodine in this film 3 was 0.1 atm%.
  • the relative density of the film 3 determined by the above-described method was 100%.
  • a titanium wire was used as the positive electrode 6.
  • An experiment was carried out under the same conditions as Example 1, except for the above described point.
  • Observation of a cross section of the negative electrode 7 under the FIB-SEM revealed that a film 3 of 90 nm was formed on the surface of the substrate 5.
  • Analysis by means of XPS revealed that the film 3 is titanium oxide.
  • the percent element composition of carbon in the film 3 was 24.6 atm%, and the total percent element composition of titanium and oxygen was 78.7 atm%.
  • the percent element composition of iodine in this film 3 was 0.3 atm%.
  • the relative density of the film 3 determined by the above-described method was 100%.
  • the percent element composition of carbon in the film 3 was 9.2 atm%, and the total percent element composition of titanium and oxygen was 83.7 atm%.
  • the percent element composition of iodine in this film 3 was 0.4 atm%.
  • the relative density of the film 3 determined by the above-described method was 100%.
  • a molybdenum wire was used as the positive electrode 6.
  • An experiment was carried out under the same conditions as Example 1, except for the above described point.
  • Observation of a cross section of the negative electrode 7 under the FIB-SEM revealed that a film 3 of 160 nm was formed on the surface of the substrate 5.
  • Analysis by means of XPS revealed that the film 3 is molybdenum oxide.
  • the percent element composition of iodine in this film 3 was less than 0.1 atm% (detection limit or lower).
  • the relative density of the film 3 determined by the above-described method was 100%.
  • the percent element composition of iodine in this film 3 was less than 0.1 atm% (detection limit or lower).
  • Acetonitrile was used as the solvent of the bath liquid 2.
  • Iodine (halogen) was dissolved in the bath liquid 2 at a concentration of 2400 ppm.
  • An experiment was carried out under the same conditions as Example 1, except for the above described points.
  • Observation of a cross section of the negative electrode 7 under the FIB-SEM revealed that a film 3 of 140 nm was formed on the surface of the substrate 5.
  • Analysis by means of XPS revealed that the film 3 is aluminum oxide. Oxygen which was not present in the bath liquid 2 was present in the film 3. It is supposed that oxygen was originated from water contained in the bath liquid 2 or moisture absorbed from the atmosphere.
  • the percent element composition of carbon in the film 3 was 9.8 atm%, and the total percent element composition of aluminum and oxygen was 90.1 atm%.
  • the percent element composition of iodine in this film 3 was 0.1 atm%.
  • the relative density of the film 3 determined by the above-described method was 100%.
  • Example 8 (solvent: acetone, metal alkoxide: aluminum triisopropoxide)
  • the film formation apparatus 11 shown in FIG. 1 was used.
  • a carbon electrode was used as the positive electrode 6.
  • a stainless plate was used as the negative electrode 7.
  • the negative electrode 7 is a substrate 5 on which a film 3 is to be formed.
  • Acetone was used as the solvent of the bath liquid 2.
  • Aluminum triisopropoxide was dissolved in the bath liquid 2 at a concentration of 16 mg/L (16 ppm), and iodine (halogen) was dissolved in the bath liquid 2 at a concentration of 2400 mg/L (2400 ppm).
  • the percent element composition of carbon in the film 3 was 8.4 atm%, and the total percent element composition of aluminum and oxygen was 84.3 atm%.
  • the percent element composition of iodine in this film 3 was less than 0.1 atm% (detection limit or lower).
  • the relative density of the film 3 determined by the above-described method was 100%.
  • Methyl ethyl ketone was used as the solvent of the bath liquid 2.
  • An experiment was carried out under the same conditions as Example 8, except for the above described point.
  • the percent element composition of carbon in the film 3 was 8.6 atm%, and the total percent element composition of aluminum and oxygen was 83.6 atm%.
  • the percent element composition of iodine in this film 3 was less than 0.1 atm% (detection limit or lower).
  • the relative density of the film 3 determined by the above-described method was 100%.
  • the percent element composition of carbon in the film 3 was 8.8 atm%, and the total percent element composition of titanium and oxygen was 86.1 atm%.
  • the percent element composition of iodine in this film 3 was 1.3 atm%.
  • the relative density of the film 3 determined by the above-described method was 100%.
  • the percent element composition of carbon in the film 3 was 9.5 atm%, and the total percent element composition of titanium and oxygen was 85.9 atm%.
  • the percent element composition of iodine in this film 3 was 0.9 atm%.
  • the relative density of the film 3 determined by the above-described method was 100%.
  • the films 3 formed in Examples 1, 2, 3, and 7 were analyzed by FT-IR.
  • the measurement conditions are as follows.
  • the film formation apparatus 11 shown in FIG. 1 was used.
  • An aluminum wire was used as the positive electrode 6.
  • a stainless plate was used as the negative electrode 7.
  • the negative electrode 7 serves as a substrate 5 on which a film 3 is to be formed.
  • Various types of solvents such as acetone, methyl ethyl ketone (MEK), methyl isobutyl ketone, and diisobutyl ketone were used as solvents of bath liquids 2.
  • Iodine (halogen) was dissolved in each bath liquid 2 at a concentration of 2100 mg/L (2100 ppm).
  • the graph of FIG. 3 shows the relation between application time (electrodeposition time) and deposition weight (deposition mass) for cases where the respective solvents were used.
  • the deposition weight is the weight of the formed film.
  • a first sample (coated substrate 1) was produced in the same manner as in Example 1. After having pulled out the first sample from the bath liquid 2, a new stainless plate was immersed into the bath liquid 2, and a voltage was applied in the same manner as in Example 1, thereby producing a second sample. In the same manner, third and fourth samples were produced. When each sample was pulled out from the bath liquid 2, a portion of the bath liquid 2 was sampled, and the aluminum element concentration was measured by ICP-MS.
  • the graph of FIG. 4 shows the relation between the number of samples experimentally produced and the aluminum element concentration of the bath liquid 2. It was found from the graph of FIG. 4 that the aluminum element concentration tends to increase with the number of samples experimentally produced. In the fourth sample, the film 3 tended to separate from the substrate 5. Therefore, it was found that, for continuous production of samples, the aluminum element concentration is preferably 1 ppm or greater and 6 ppm or less.
  • the film formation apparatus 11 shown in FIG. 1 was used.
  • An aluminum wire was used as the positive electrode 6.
  • a stainless plate was used as the negative electrode 7.
  • the negative electrode 7 serves as a substrate 5 on which a film 3 is to be formed.
  • Various types of solvents i.e., acetone and methyl ethyl ketone (MEK)
  • MEK methyl ethyl ketone
  • Iodine (halogen) was dissolved in the bath liquids 2 in amounts shown Table 1.
  • Table 1 Solvent Amount of iodine (g/L) Film formation state First sample Second sample Third sample Fourth sample Fiftieth sample Acetone 0.014 A A A A A 0.14 A A B B - 0.6 A B B B - 1.2 A A B B - 2.4 A A A B - MEK 0.014 A A A A A 0.6 A A A B - 1.2 A A A B - 2.4 A B B B -
  • Formation of the film 3 was attempted for cases where various types of substrates 5 were use.
  • a permalloy plate, a titanium plate, a copper plate, and a carbon plate were used, respectively. Experiments were carried out under the same conditions as in Example 1 except for the above-described point.
  • the film 3 was stably formed on each of the substrates 5. Therefore, it was confirmed that stable formation of the film 3 is possible irrespective of the type of the substrate 5.
  • novel coated substrates 1 which can be applied to various fields and can be mass-produced are provided.

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EP23849917.2A 2022-08-05 2023-07-20 Coated substrate Pending EP4567161A1 (en)

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JP2022125321 2022-08-05
PCT/JP2023/026614 WO2024029362A1 (ja) 2022-08-05 2023-07-20 被覆基材

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