Classifications

• • 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
  • C23F—NON-MECHANICAL REMOVAL OF METALLIC MATERIAL FROM SURFACE; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL; MULTI-STEP PROCESSES FOR SURFACE TREATMENT OF METALLIC MATERIAL INVOLVING AT LEAST ONE PROCESS PROVIDED FOR IN CLASS C23 AND AT LEAST ONE PROCESS COVERED BY SUBCLASS C21D OR C22F OR CLASS C25
  • C23F1/00—Etching metallic material by chemical means
  • C23F1/10—Etching compositions
  • C23F1/14—Aqueous compositions
  • C23F1/16—Acidic compositions
  • C23F1/28—Acidic compositions for etching iron group metals
• • C—CHEMISTRY; METALLURGY
  • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
  • C22C—ALLOYS
  • C22C38/00—Ferrous alloys, e.g. steel alloys
• • C—CHEMISTRY; METALLURGY
  • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
  • C22C—ALLOYS
  • C22C38/00—Ferrous alloys, e.g. steel alloys
  • C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
  • C22C38/40—Ferrous alloys, e.g. steel alloys containing chromium with nickel

Definitions

• the present invention relates to an aqueous composition, a method for manufacturing stainless steel using the aqueous composition, and a method for thinning stainless steel, and particularly relates to an aqueous composition for thinning stainless steel.
• stainless steel Due to its excellent durability and weather resistance, stainless steel has been considered for use in various fields in recent years. For example, stainless steel is increasingly being used in the housings of electronic parts, battery current collector foils, and automobile parts.
• Patent Document 1 When stainless steel is used in various products, treatment to increase the surface area (for example, Patent Document 1), treatment to form unevenness on the surface of stainless steel (for example, Patent Document 2), etc. It has been known.
• the present invention provides the following aqueous composition, method for producing stainless steel, method for thinning stainless steel, and the like.
• the present invention includes the following.
• An aqueous composition for forming a thin film on stainless steel comprising 0.01 to 10% by mass of hydrogen peroxide, 12.5 to 40% by mass of halide ions, and 0 to 3.0% by mass.
• a method for manufacturing stainless steel comprising a thin film treatment step of thinning stainless steel using the aqueous composition according to [1] or [2] above.
• the thickness ( ⁇ m) of the stainless steel subjected to the thinning treatment is 0.95 times or less the thickness ( ⁇ m) of the stainless steel before being subjected to the thinning treatment, [3] to [ above] 7].
• an aqueous composition capable of thinning stainless steel by a simple method, a method for manufacturing stainless steel having such a thinning process, and a thinning treatment method. According to the present invention, it is possible to reduce the surface roughness of foil-shaped or plate-shaped stainless steel while reducing its thickness.
• the aqueous composition of the present invention is used to make stainless steel into a thin film, and in each case, based on the total amount of the aqueous composition, 0.01 to 10% by mass of hydrogen peroxide and 12.5 to 40% by mass of halogen. oxide ions, and 0 to 3.0% by mass of copper ions.
• the aqueous composition of the present invention may also contain water, particularly ion-exchanged water or ultrapure water. Each component of the aqueous composition will be explained below.
• the concentration of hydrogen peroxide in the aqueous composition is 0.01 to 10% by mass, preferably 0.05 to 7% by mass, 0.1 to 7% by mass, based on the total amount (total mass) of the aqueous composition. 5% by mass or 0.15 to 7% by mass, more preferably 0.2 to 3% by mass or 0.3 to 4% by mass, still more preferably 0.3 to 2% by mass or 0.
• the amount is 4 to 1.5% by weight, particularly preferably 0.5 to 1% by weight.
• the lower limit of the concentration of hydrogen peroxide in the aqueous composition is, for example, 0.001% by mass, 0.01% by mass, 0.05% by mass, 0% by mass, based on the total amount (total mass) of the aqueous composition.
• the upper limit of the concentration of hydrogen peroxide contained in the aqueous composition is, for example, 9% by mass, 8% by mass, 7% by mass, 6% by mass, 5% by mass, based on the total amount (total mass) of the aqueous composition.
• the range of the concentration of hydrogen peroxide can be selected from a range that is a combination of the above lower limit and upper limit as appropriate.
• the effects of the present invention tend to be more preferably achieved, and copper ions, halide ions, etc., which will be described later, coexist in the aqueous composition. Also, the possibility of heat generation or foaming due to the decomposition of hydrogen peroxide is suppressed, ensuring work safety.
• halide ion (1-2. Halide ion (halogen ion)
• the type of halide ion contained in the aqueous composition is not particularly limited and may be, for example, fluoride ion, chloride ion, bromide ion, or iodide ion. More preferable from the viewpoint of sex.
• Halogen compounds that provide halide ions are not particularly limited, but include, for example, hydrochloric acid, alkali metal halides such as sodium halide and potassium halide, and alkaline earth metal halides such as calcium halide. , ammonium halides, copper halides, and hydrogen halides.
• hydrochloric acid, an alkali metal halide, or hydrogen halide are preferred, and hydrochloric acid or sodium chloride is more preferred, from the viewpoint of more effectively and reliably achieving the effects of the present invention.
• the halogen compounds may be used alone or in combination of two or more. Note that the halogen compound may overlap with the copper compound described below. For example, when copper halide is used as a source of halide ions, the copper halide also corresponds to the copper compound described below as a source of copper ions. As the copper halide, copper chloride is preferred. Halogen compounds (halide ions) are thought to cause pitting corrosion on the passive film during film thinning treatment on the surface of stainless steel.
• the concentration of halide ions in the aqueous composition is 12.5 to 30% by mass, preferably 13 to 28% by mass, or 14 to 29% by mass, or 15 to 30% by mass, more preferably 16 to 26% by mass or 17 to 27% by mass, particularly preferably 18 to 25% by mass, 19 to 26% by mass, or 20 to 25% by mass.
• the lower limit of the concentration of halide ions in the aqueous composition is 8% by mass, 10% by mass, 12% by mass, 14% by mass, 15% by mass, 16% by mass, based on the total amount (total mass) of the aqueous composition.
• the upper limit of the concentration of halide ions is 30% by mass, based on the total amount of the aqueous composition. It may be 29% by mass, 28% by mass, 27% by mass, 26% by mass, or 25% by mass.
• the range of the halide ion concentration can be appropriately selected from a range that is a combination of the lower limit and upper limit described above.
• the effects of the present invention tend to be more suitably achieved. More specifically, in an aqueous composition in which the concentration of halide ions is within the above range, a thin film can be achieved while preventing the pitting reaction of stainless steel from progressing, and the decomposition reaction of hydrogen peroxide can be prevented. It is also possible to prevent this and ensure safety.
• the concentration of copper ions in the aqueous composition is 0 to 3% by mass, based on the total amount (total mass) of the aqueous composition. That is, the aqueous composition of the present invention does not contain copper ions or has a content of copper ions of 3% by mass or less based on the total amount (total mass) of the aqueous composition. Copper ions in aqueous compositions can be generated by mixing a copper compound as a source of copper ions with other ingredients.
• the type of copper ion source is not particularly limited as long as it is a copper compound that can supply copper ions in an aqueous composition.
• copper sulfate such as cupric sulfate
• copper chloride such as cupric chloride, copper tetrafluoroborate, cupric bromide, oxide
• cupric acid copper phosphate, copper acetate, copper formate, and copper nitrate.
• copper sulfate or copper chloride is preferred, and cupric sulfate or cupric chloride is more preferred, from the viewpoint of more effectively and reliably achieving the effects of the present invention, ease of handling, and economical efficiency. More preferred is cupric sulfate. These may be used alone or in combination of two or more.
• Copper ions contained in the aqueous composition cause a substitution reaction with nickel and chromium, which are components of stainless steel, during film thinning treatment, and then the substitution reaction products derived from copper ions are removed to create a suitable roughness. It is assumed that a curved shape can be obtained.
• the quality of stainless steel after thinning treatment, especially in the aqueous composition used to treat thin stainless steel foil, is important to prevent extremely thin areas and pinholes, as described below. Therefore, it is preferable to adjust the content of copper ions.
• the concentration of copper ions contained in the aqueous composition is 3% by mass or less, preferably 2% by mass or less, less than 1.5% by mass, or 1.5% by mass or less, more preferably 1.2% by mass or less. It may be less than or equal to 1.0 mass%, and may be less than or equal to 0.75 mass%, 0.5 mass% or less, or less than 0.25 mass%.
• the concentration range of copper ions is 0 to 3% by mass, preferably 0 to 2% by mass or 0 to 1.5% by mass, more preferably 0 to 1.5% by mass or 0.1 to 1% by mass. .2% by mass, more preferably 0.2 to 1.0% by mass, and may be 0.3 to 1.5% by mass.
• the lower limit of the concentration of copper ions in the aqueous composition is 0% by mass based on the total amount (total mass) of the aqueous composition, for example, 0.00001% by mass (0.1 mass ppm), 0. 0001 mass% (1 mass ppm), 0.001 mass%, 0.01 mass%, 0.02 mass%, 0.03 mass%, 0.05 mass%, 0.07 mass%, 0.1 mass% It may be.
• the upper limit value of the concentration of copper ions in the aqueous composition is, for example, 3% by mass, 2.5% by mass, 2% by mass, 1.7% by mass, 1.5% by mass based on the total amount of the aqueous composition.
• the range of the concentration of copper ions is a range that appropriately combines the above-mentioned lower limit and upper limit, for example, 0.0001 to 3 mass %, 0.001 to 3 mass %, 0.01 to 2 mass %, 0. 01-1.7% by mass, 0.01-1.5% by mass, 0.02-1% by mass, 0.03-0.25% by mass, 0.03-0.20% by mass, 0.05- It can be appropriately selected from 0.15% by mass, 0.05 to 0.12% by mass, etc.
• the concentration of copper ions in the aqueous composition is too high, pinholes or extremely thin areas are likely to occur in the stainless steel after thinning treatment, and if the concentration of copper ions is too low, thinning treatment will be difficult. It may not proceed efficiently.
• the aqueous composition of the present invention may contain additives as components other than the above-mentioned hydrogen peroxide, copper ions, and halide ions, within a range that exhibits the effects of the present invention.
• additives include heterocyclic nitrogen compounds (azole compounds), organic solvents, and the like. These may be used alone or in combination of two or more. Further, additives include surfactants, pH adjusters, etc., but these are preferably not included in the aqueous composition of the present invention.
• the concentration of the additive that may be contained in the aqueous composition is preferably 10% by mass or less, more preferably 5.0% by mass or less, and even more preferably 2.0% by mass or less. , particularly preferably 1.0% by mass or less.
• the aqueous composition of the present invention may contain water, and preferably contains water.
• Water is not particularly limited, but water from which metal ions, organic impurities, particles, etc. have been removed by distillation, ion exchange treatment, filter treatment, various adsorption treatments, etc. is preferable, pure water is more preferable, and ultrapure water is preferable. Particularly preferred.
• the content of water in the aqueous composition of the present invention is the balance of the above-mentioned components and the additives detailed below, and is not particularly limited, but is 50 to 98% based on the total amount (total mass) of the aqueous composition.
• the aqueous composition of the present invention is preferably a solution, and preferably does not contain components that are insoluble in the composition, which is the solution, such as solid particles such as abrasive particles.
• the aqueous composition containing each of the above-mentioned components is capable of effectively promoting thinning of the stainless steel while suppressing an extreme increase in roughness on the surface of the stainless steel, that is, the occurrence of noticeable unevenness, as described below.
• Halide ions play a role in pitting the oxide film that is normally formed on the surface of stainless steel.
• copper ions have the effect of causing a substitution reaction with nickel and chromium, which are components of stainless steel, and after that, the substitution reaction products derived from copper ions are removed, and some It is thought that the film is thinned while forming unevenness.
• hydrogen peroxide serves to remove the substitution reaction product derived from copper ions after the above-mentioned substitution reaction.
• the aqueous composition containing copper ions, etc. whose content is adjusted to an appropriate range, prevents the occurrence of extremely thin areas and pinholes in stainless steel after thinning treatment, especially in stainless steel foil. can.
• the aqueous composition of the present invention is prepared by adding the above-mentioned hydrogen peroxide-containing component, halide ion-supplying component, water, and, if necessary, a copper ion-supplying component and other components, and stirring until uniform. It is prepared in
• the properties of the aqueous composition are not particularly limited, but the pH value is preferably -1.0 to 4.0, more preferably -0.5 to 3.0, and even more preferably, -0.25 to 2.5, particularly preferably -0.1 to 2.0, 0.0 to 1.5, 0.005 to 1.0, or 0.01 to 0.5.
• the pH value can be measured by the method described in the Examples.
• the method for manufacturing stainless steel of the present invention includes a thinning treatment step of thinning stainless steel using the above-mentioned aqueous composition. According to the method for producing stainless steel of the present invention, it is possible to reduce the thickness of a plate-shaped or thin stainless steel while generally maintaining its surface smoothness.
• the arithmetic mean roughness (Ra) of the surface of thinned stainless steel is 0.35 ⁇ m. It is possible to suppress it to below. That is, in surface treatment of stainless steel, the surface roughness often increases, but in the method for manufacturing stainless steel of the present invention, the arithmetic mean roughness (Ra) value of the surface after treatment is reduced to 0. It can be suppressed to 35 ⁇ m or less.
• the arithmetic mean roughness (Ra) value on the surface of the stainless steel subjected to thinning treatment is 0.34 ⁇ m or less, 0.33 ⁇ m or less, 0.32 ⁇ m or less, 0.31 ⁇ m or less, 0.30 ⁇ m or less, 0.29 ⁇ m. or less, or 0.28 ⁇ m or less, more preferably 0.27 ⁇ m or less, or 0.26 ⁇ m or less, particularly preferably 0.25 ⁇ m or less, 0.24 ⁇ m, or 0.23 ⁇ m or less.
• the value of the arithmetic mean roughness (Ra) of the stainless steel surface subjected to the thinning treatment may be 0.4 ⁇ m or less, 0.5 ⁇ m or less, or 0.6 ⁇ m or less.
• the lower limit of the arithmetic mean roughness (Ra) of the surface of stainless steel subjected to thinning treatment is not particularly limited, but is, for example, 0.03 ⁇ m or more, 0.05 ⁇ m or more, or 0.07 ⁇ m or more. It may be.
• the arithmetic mean roughness (Ra) of untreated stainless steel is not particularly limited, but is, for example, 0.02 to 0.15 ⁇ m or 0.03 to 0.10 ⁇ m, preferably 0. It is .04 to 0.08 ⁇ m.
• the arithmetic mean roughness (Ra) of the plane of untreated stainless steel at a value A1 of the arithmetic mean roughness (Ra) of the surface of the stainless steel after the thinning treatment. ) with respect to the value A 2 (A 1 - A 2 ( ⁇ m)) can be set to 0.3 ⁇ m or less, and preferably, the value of the increase in Ra is 0.27 ⁇ m or less or 0.25 ⁇ m or less More preferably, the value of the increase in Ra is 0.23 ⁇ m or less or 0.20 ⁇ m or less, and particularly preferably the value of the increase in Ra is 0.18 ⁇ m or less or 0.16 ⁇ m or less.
• the stainless steel thinning treatment method of the present invention it is possible to suppress the maximum height (Rz) of the surface of the stainless steel subjected to the thinning treatment to 2.5 ⁇ m or less. That is, in the surface treatment of stainless steel, the surface roughness often increases, but in the stainless steel manufacturing method of the present invention, the maximum height (Rz) of the surface after treatment is set to 2.5 ⁇ m. It can be suppressed to below.
• the maximum height (Rz) value on the surface of the stainless steel subjected to thinning treatment is 2.4 ⁇ m or less, 2.3 ⁇ m or less, 2.2 ⁇ m or less, 2.1 ⁇ m or less, 2.0 ⁇ m or less, 1.9 ⁇ m or less Alternatively, it is 1.8 ⁇ m or less, more preferably 1.7 ⁇ m or less, or 1.6 ⁇ m or less, particularly preferably 1.5 ⁇ m or less, 1.4 ⁇ m or less, or 1.3 ⁇ m or less. Further, the maximum height (Rz) of the surface of the stainless steel subjected to the thinning treatment may be 3.0 ⁇ m or less, 3.5 ⁇ m or less, or 4.0 ⁇ m or less.
• the lower limit of the maximum height (Rz) of the surface of the thinned stainless steel is not particularly limited, but is, for example, 0.6 ⁇ m or more, 0.8 ⁇ m or more, or 1.0 ⁇ m or more. There may be.
• the maximum height (Rz) of untreated stainless steel is not particularly limited, but is, for example, 0.2 to 1.8 ⁇ m or 0.3 to 1.6 ⁇ m, preferably 0.2 to 1.8 ⁇ m or 0.3 to 1.6 ⁇ m. It is 35 to 1.3 ⁇ m.
• the maximum height (Rz) of the plane of untreated stainless steel at the maximum height (Rz) of the surface of the stainless steel after the thinning treatment Z 1 can be set to 2.2 ⁇ m or less, and preferably the value of the amount of increase in Rz is 1.8 ⁇ m or less or 1.7 ⁇ m or less.
• the value of the increase in Rz is 1.6 ⁇ m or less or 1.5 ⁇ m or less, particularly preferably the value of the increase in Rz is 1.4 ⁇ m or less, 1.3 ⁇ m or less, 1.2 ⁇ m or less, It is 1.1 ⁇ m or less or 1.0 ⁇ m or less.
• the arithmetic mean roughness (Ra) and maximum height (Rz) described above are calculated according to JIS B 0601-2001.
• the device used for measurement is not particularly limited, for example, a laser microscope can be used.
• the arithmetic mean roughness after the thinning treatment process was calculated.
• the values of height (Ra) and maximum height (Rz) can be measured. However, such physical means are not necessarily practical as part of the manufacturing process.
• the density of the stainless steel that has undergone the thinning treatment step is preferably 4.5 g/cm 3 or more. Although it is recognized that the density of stainless steel tends to decrease due to the action of the aqueous composition, an extreme decrease in density is also prevented by the thinning treatment process.
• the density of the stainless steel after the thinning treatment is more preferably 5.0 g/cm 3 or more, 5.3 g/cm 3 or more, or 5.5 g/cm 3 or more, and more preferably 5.6 g/cm 3 or more.
• the density of stainless steel after the thinning treatment is not particularly limited, but is usually 7.3 g/cm 3 or less.
• the density value D 1 (g/cm 3 ) of the stainless steel after the thinning treatment is the same as the density value D 2 (g/cm 3 ) of the same stainless steel without the thinning treatment.
• g/cm 3 preferably 0.60 times or more (D 1 /D 2 ⁇ 0.60), 0.65 times or more, 0.70 times or more, or 0.72 times or more More preferably, it is 0.74 times or more, 0.76 times or more, or 0.78 times or more, and 0.80 times or more, 0.82 times or more, or 0.85 times or more.
• the density ratio D 1 /D 2 before and after the thinning process is not particularly limited, but is usually 0.98 times or less.
• the density value D 1 (g/cm 3 ) of stainless steel after the thinning treatment and the density value D 2 (g/cm 3 ) of the same stainless steel without the thinning treatment g/cm 3 ), that is, the value of D 2 ⁇ D 1 (g/cm 3 ), is preferably 3.0 (g/cm 3 ) or less, and 2.8 (g/cm 3 ).
• the density difference D 2 ⁇ D 1 (g/cm 3 ) before and after the thinning process is not particularly limited, but is usually 0.1 (g/cm 3 ) or more.
• the shape and thickness of the stainless steel to be subjected to the thinning treatment are not particularly limited, stainless steel in the form of foil or plate is preferably used.
• the thickness is, for example, 100 ⁇ m or less, preferably 50 ⁇ m or less or 25 ⁇ m or less, more preferably 20 ⁇ m or less or 18 ⁇ m or less, More preferably, it is 15 ⁇ m or less or 12 ⁇ m or less, particularly preferably 10 ⁇ m or less.
• the lower limit of the thickness varies depending on the use and is not particularly limited, but from the viewpoint of durability and weather resistance, it is preferably 1 ⁇ m or more.
• the thickness is, for example, 2.0 mm or less, preferably 1.5 mm or less, and more preferably 1.2 mm or less or less than 1.2 mm. It is more preferably 1.1 mm or less, less than 1.1 mm, or 1.0 mm or less, particularly preferably 0.8 mm or less.
• the lower limit of the thickness varies depending on the use and is not particularly limited, but from the viewpoint of durability and weather resistance, it is preferably 0.1 mm or more.
• the thickness T 1 ( ⁇ m) of the stainless steel after the thinning treatment is compared to the thickness T 2 ( ⁇ m) of the same stainless steel without the thinning treatment.
• the types of stainless steel to be subjected to the thinning treatment using the aqueous composition of the present invention are not particularly limited, but include, for example, the following. That is, chromium-nickel stainless steel including SUS304, SUS316, SUS321, SUS347, and SUS329J1 defined by JIS G4305 standard; ferritic stainless steel (chrome stainless steel) including SUS405, SUS430, SUS434, SUS444, SUS447, and SUSXM27; and SUS630 , SUS631, and precipitation hardening systems (chromium-nickel stainless steel) including SUH660.
• SUS304, SUS430 series (SUS430, SUS430LX, etc.), SUS444, etc. are more preferable for the thin film treatment with the aqueous composition.
• the above-mentioned aqueous composition is preferably used. That is, an aqueous composition containing 0.1 to 5% by mass of hydrogen peroxide, 1 to 30% by mass of halide ions, and 0 to 40% by mass of copper ions is formed into a thin film based on the total amount of the aqueous composition. It is preferable to use it in the chemical treatment step. Details of the components of the aqueous composition are as described above. Although fine irregularities are formed on the surface of stainless steel by the aqueous composition, significant roughening is prevented, and the thickness of stainless steel can be extremely reduced.
• the thin film treatment method of the present invention includes a thin film treatment step of performing thin film treatment on the surface of stainless steel using the above-mentioned aqueous composition.
• performing a thin film treatment on the surface of stainless steel using an aqueous composition means bringing the aqueous composition used for treatment into contact with the surface of the stainless steel.
• the stainless steel thin film treatment method of the present invention includes at least the step of bringing the aqueous composition into contact with the stainless steel surface.
• the film thinning treatment step the above-mentioned aqueous composition is brought into contact with the stainless steel to be treated.
• the temperature of the film thinning treatment is preferably 20 to 60°C, more preferably 25 to 55°C, and particularly preferably 30 to 50°C.
• the stainless steel thinning treatment method of the present invention is excellent in that the thinning of the stainless steel surface progresses even at a room temperature of 25° C., for example, even if the temperature is not so high.
• the temperature of the thin film treatment refers to the temperature at which the aqueous composition and the stainless steel surface are brought into contact, particularly the liquid temperature of the aqueous composition brought into contact with the stainless steel surface.
• the time for the film thinning process is preferably 30 seconds to 180 seconds, more preferably 40 seconds to 150 seconds, and particularly preferably 50 seconds to 130 seconds.
• the stainless steel thinning treatment method of the present invention is excellent in that the thinning of stainless steel proceeds even if it does not take a very long time.
• the time for thinning treatment refers to the time for contacting the aqueous composition with the stainless steel surface. For example, it is the time during which the stainless steel is immersed in the aqueous composition, or the time from when the aqueous composition is sprayed onto the surface of the stainless steel until the time when the aqueous composition is removed with water or the like.
• the method of bringing the aqueous composition into contact with the stainless steel surface is not particularly limited.
• the aqueous composition may be brought into contact with the stainless steel by dropping or spraying (spraying treatment), or A method such as immersion in an aqueous composition can be adopted.
• any method may be adopted.
• there is a method of spraying an aqueous composition onto stainless steel processed into a specific shape to obtain a thin film of stainless steel or a method of installing a dripping device, a spraying device, or a dipping device for an aqueous composition between stainless steel foil rolls.
• the aqueous composition is passed through the apparatus while the stainless steel foil is unrolled and moved from the roll on which the untreated stainless steel foil was wrapped, and the aqueous composition is applied to form a thin film.
• a method in which a roll is obtained by winding up a chemically treated stainless steel foil may be subjected to a process such as washing with water (cleaning process).
• a thinning treatment in which the aqueous composition of the present invention is brought into contact with the surface of the stainless steel to be treated, or necessary
• appropriate cleaning for example, water cleaning
• the processing conditions for thinning treatment are mild and the time required is short, so according to the present invention, stainless steel can be efficiently thinned.
• the above-mentioned thinning process is useful not only as part of a stainless steel manufacturing method, but also as a post-treatment for stainless steel after manufacturing, for example.
• the stainless steel thinning treatment method of the present invention includes the above-mentioned thinning treatment step. Therefore, in the thinning process used in the thinning process, the properties and type of stainless steel, components of the aqueous composition, conditions for the thinning process, etc. are as described above.
• thin film stainless steel can be used, for example, in current collector foils for batteries such as solid batteries and lithium ion batteries, solar cell substrates, flexible substrates for electronic devices, substrates for electricity storage devices, exhaust gas purification catalysts, etc. It can be used for applications such as carriers, electromagnetic shielding members, and heat radiating members.
• the thinned stainless steel foil obtained by the stainless steel manufacturing method of the present invention is suitably used, for example, as a current collector foil for batteries.
• the thickness values of the surface-treated stainless steel foils in Examples and Comparative Examples and the untreated stainless steel foils in Reference Examples 1 to 4 were measured using a digital micrometer (manufactured by Mitutoyo Co., Ltd., MDC-25MXT). .
• Example 1 A stainless steel (foil) having a thickness of 10 ⁇ m, a vertical and horizontal length of 30 mm x 30 mm, and made of SUS444 was prepared (Reference Example 1). Into 130 ml of ultrapure water, add hydrogen peroxide in an amount that will give a final concentration of 0.5% by mass (1.7 g of a 60 wt% aqueous hydrogen peroxide solution) and 72% by mass (143 g) of a 35 wt% aqueous solution of hydrochloric acid, respectively. An aqueous composition was prepared. The concentration of halide ions (Cl ⁇ ) derived from hydrochloric acid in this composition was 25% by mass based on the total amount of the aqueous composition.
• the stainless steel foil was immersed in the aqueous composition at a liquid temperature of 30° C. for 60 seconds. Next, the stainless steel foil after immersion was thoroughly washed with ultrapure water, and then thoroughly dried to obtain a surface-treated foil.
• the thickness was 9 ⁇ m
• the surface Ra value was 0.17 ( ⁇ m)
• the surface Rz value was 1.53 ( ⁇ m)
• the density was 9 ⁇ m. was 6.6 g/ cm3 .
• Examples 2 to 9/Comparative Examples 1 to 9 A stainless steel foil was subjected to a thin film treatment in the same manner as in Example 1, except that the stainless steel to be treated, the properties of the aqueous composition, and the conditions of the thin film treatment method were changed as shown in Table 1 below. I got it.
• Tables 1 to 4 show the amount of change and rate of change in the measured value after treatment, which was calculated based on the value of the reference example before treatment, together with the measured value.

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