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 a method for producing stainless steel, a method for reducing the weight of stainless steel, a stainless steel and an aqueous composition, and particularly relates to a stainless steel with a low density, a method for producing the same, a method for reducing the weight of the stainless steel, and a method for reducing the weight of stainless steel.
• This invention relates to useful aqueous compositions.
• 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.
• stainless steel with a predetermined thickness and low density may be required. Even with conventional stainless steel manufacturing methods or surface treatment methods, it has been difficult to obtain a stainless steel with a specified low density due to weight reduction.
• the present invention provides the following stainless steel manufacturing method, weight reduction treatment method, stainless steel, aqueous composition, etc.
• the present invention includes the following.
• [1] Including a lightweighting treatment step of lightweighting stainless steel using an aqueous composition, A method for producing stainless steel, wherein the weight-reduced stainless steel has a density of less than 7.4 g/cm 3 .
• [2] The method for producing stainless steel according to [1] above, wherein the weight-reduced stainless steel has a density of 7.0 g/cm 3 or less.
• the density (g/cm 3 ) of the stainless steel subjected to weight reduction treatment is 0.95 times or less of the density (g/cm 3 ) of the stainless steel before weight reduction treatment. 1] or the method for producing stainless steel according to [2].
• Stainless steel having a density of less than 7.4 g/cm 3 and a thickness of 100 ⁇ m or less.
• Including a lightweighting treatment step of lightweighting stainless steel using an aqueous composition A method for reducing the weight of stainless steel, wherein the density of the weight-reducing stainless steel is less than 7.4 g/cm 3 .
• An aqueous composition for reducing the weight of stainless steel 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. , aqueous composition.
• the present invention it is possible to realize a stainless steel manufacturing method, a lightweight treatment method, an aqueous composition, and a low-density stainless steel that enable reduction in weight and density of stainless steel by a simple method. According to the present invention, it is possible to reduce the weight of stainless steel, preferably in the form of a foil or plate, without making it very thin. Further, according to the present invention, it is possible to realize a stainless steel having a lower density, a method for manufacturing such stainless steel, etc., while preventing deterioration of surface properties such as the occurrence of pinholes.
• the method for manufacturing stainless steel of the present invention includes a weight reduction treatment step of treating stainless steel for weight reduction using an aqueous composition. According to the method for producing stainless steel of the present invention, it is possible to reduce the weight and density of stainless steel, such as plate-shaped or thin stainless steel, while generally maintaining the thickness before the weight-reducing treatment.
• the density of the stainless steel that has undergone the weight reduction process is less than 7.4 g/cm 3 (7.40 g/cm 3 ).
• the density of the stainless steel of one embodiment of the present invention for example, the stainless steel obtained by weight reduction treatment, is preferably 7.3 g/cm 3 , 7.29 g/cm 3 or less, less than 7.29 g/cm 3 , 7.
• the lower limit of the density of stainless steel after weight reduction treatment varies depending on the use and is not particularly limited, but from the viewpoint of durability and weather resistance, it is usually preferably 1.3 g/cm 3 or more.
• the density value D 1 (g/cm 3 ) of stainless steel after weight reduction treatment is the same as the density value D 2 (g/cm 3 ) of the same stainless steel without weight reduction treatment. g/cm 3 ), it is preferably 0.95 times or less (D 1 /D 2 ⁇ 0.95), more preferably 0.93 times or less or 0.91 times or less, and 0. It is more preferably .90 times or less or 0.88 times or less, particularly preferably 0.85 times or less, 0.82 times or less, or 0.80 times or less.
• the lower limit of the density ratio D 1 /D 2 before and after the weight reduction treatment varies depending on the use and is not particularly limited, but from the viewpoint of durability and weather resistance, it is usually preferably 0.16 times or more.
• the density value D 1 (g/cm 3 ) of stainless steel after weight reduction treatment and the density value D 2 ( g/cm 3 ), that is, the value of D 2 ⁇ D 1 (g/cm 3 ), is preferably 0.2 (g/cm 3 ) or more, and 0.4 (g/cm 3 ). More preferably, it is 0.5 (g/cm 3 ) or more, or 0.6 (g/cm 3 ) or more, and 0.8 (g/cm 3 ) or more, 0.9 (g/cm 3 ).
• the upper limit of the density difference D 2 - D 1 (g/cm 3 ) before and after weight reduction treatment varies depending on the application and is not particularly limited, but from the viewpoint of durability and weather resistance, it is usually 6.7 (g/cm 3 ). 3 ) The following is preferable.
• the shape and thickness of the stainless steel to be subjected to weight reduction 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 stainless steel after weight reduction treatment is compared to the thickness T 2 ( ⁇ m) of the same stainless steel without weight reduction treatment. , preferably 0.80 times or more (T 1 /T 2 ⁇ 0.80), more preferably 0.85 times or more or 0.90 times or more, 0.95 times or more or 0.98 It is more preferably twice or more, and particularly preferably 1.0 times, so that the thickness before treatment can be maintained.
• the types of stainless steel to be subjected to weight reduction 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 as targets for weight reduction treatment using the aqueous composition.
• the aqueous composition used in the method for manufacturing stainless steel contains 0.1 to 5% by mass of hydrogen peroxide, 1 to 30% by mass of halide ions, and 0 to 40% by mass, based on the total amount of the aqueous composition. % of copper ions. Details of the components of the aqueous composition will be described later.
• the aqueous composition forms fine recesses on the surface of the stainless steel, making it possible to reduce the weight of the stainless steel without significantly reducing its thickness.
• the light weight treatment method of the present invention includes a light weight treatment step of performing light weight treatment on the surface of stainless steel using the above-mentioned aqueous composition.
• performing lightweight treatment on a stainless steel surface using an aqueous composition means bringing the aqueous composition used for treatment into contact with the stainless steel surface.
• the stainless steel lightweight treatment method of the present invention includes at least the step of bringing the aqueous composition into contact with the stainless steel surface.
• the above-mentioned aqueous composition is brought into contact with the stainless steel to be treated.
• the temperature of the weight reduction treatment is preferably 20 to 60°C, more preferably 25 to 55°C, and particularly preferably 30 to 50°C.
• the stainless steel weight reduction treatment method of the present invention is excellent in that the weight reduction 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 weight reduction 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 weight reduction treatment is preferably 30 seconds to 120 seconds, more preferably 40 seconds to 100 seconds, and particularly preferably 50 seconds to 90 seconds.
• the method for reducing the weight of stainless steel according to the present invention is excellent in that the weight reduction of stainless steel progresses even if it does not take a very long time.
• the time for weight reduction 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.
• 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 delivered to the lightweight material.
• a method in which a roll is obtained by winding up a chemically treated stainless steel foil may be subjected to a treatment such as washing with water (cleaning step).
• the above-mentioned weight reduction treatment 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 weight reduction treatment method of the present invention includes the above-mentioned weight reduction treatment steps. Therefore, in the weight reduction treatment used in the weight reduction treatment method, the properties and type of stainless steel, the components of the aqueous composition, the conditions for the weight reduction treatment, etc. are as described above.
• the aqueous composition of the present invention is suitably used in the above-mentioned stainless steel manufacturing method or stainless steel weight reduction treatment method.
• the aqueous composition of the present invention contains 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, all based on the total amount of the aqueous composition.
• the aqueous composition may include water and the like, particularly ion-exchanged water or ultrapure water. Each component of the aqueous composition will be explained below.
• Hydrogen peroxide contained in aqueous compositions is usually mixed with other ingredients as an aqueous solution at a moderate concentration.
• concentration of hydrogen peroxide in the aqueous hydrogen peroxide solution used for producing the aqueous composition is not particularly limited, and may be, for example, 10 to 90%, and 35% to 60% in accordance with industrial standards. It is preferable that Hydrogen peroxide may also contain up to about 0.01% by weight of stabilizers, and acceptable stabilizers include sulfuric acid, phosphoric acid, and the like.
• stabilizers include sulfuric acid, phosphoric acid, and the like.
• the concentration of hydrogen peroxide in the aqueous composition is 0.1 to 5.0% by mass, preferably 0.2 to 4.5% by mass, based on the total amount (total mass) of the aqueous composition. Yes, more preferably 0.3 to 4.5% by mass or 0.2 to 4.0% by mass, still more preferably 0.35 to 3.0% by mass or 0.3 to 3.5% by mass. %, particularly preferably 0.4 to 2.0 mass %, 0.45 to 1.5 mass %, 0.45 to 1.2 mass %, or 0.5 to 1.0 mass %. .
• 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. Even if it is .15 mass%, 0.2 mass%, 0.25 mass%, 0.3 mass%, 0.35 mass%, 0.4 mass%, 0.45 mass% or 0.5 mass% Often, the upper limit of the concentration of hydrogen peroxide contained in an aqueous composition is, for example, 4.8% by mass, 4.5% by mass, or 4.2% by mass based on the total amount (total mass) of the aqueous composition.
• the content may be .0% by mass, 1.8% by mass, 1.5% by mass, 1.2% by mass, 1.0% by mass, or the like.
• the range of the concentration of hydrogen peroxide can be appropriately selected from the combination of the lower limit and upper limit described above.
• 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 (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 weight reduction treatment on the surface of stainless steel.
• the concentration of halide ions in the aqueous composition is 1 to 30% by mass, preferably 2.0 to 25% by mass, more preferably, It is 4.0 to 22% by weight or 3.0 to 20% by weight, particularly preferably 5.0 to 15% by weight, 8 to 15% by weight, or 10 to 15% by weight.
• the concentration range of halide ions in the aqueous composition is 0.01% by mass, 0.1% by mass, 0.5% by mass, 1.0% by mass based on the total amount (total mass) of the aqueous composition. %, 2.0% by mass, 3.0% by mass, 5.0% by mass, 8.0% by mass, 10.0% by mass, and 12.0% by mass as the lower limit, and the total amount of the aqueous composition.
• the upper limit 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 concentration of halide ions By setting the concentration of halide ions within the above-mentioned range, 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-mentioned range, it is possible to prevent the pitting reaction of stainless steel from progressing, to form minute depressions on the surface, and to prevent peroxidation. Safety can also be ensured by preventing hydrogen decomposition reactions.
• the concentration of copper ions in the aqueous composition is 0 to 40% 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 copper ion content of 40% 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 weight reduction treatment, and then by removing the substitution reaction products derived from copper ions, depressions are formed on the surface. is assumed to be formed.
• the quality of stainless steel after lightweight processing, especially in the aqueous composition used for processing thin stainless steel foils, is important in order to prevent extremely thin areas and pinholes, as described below. , it is preferable to adjust the content of copper ions.
• the concentration of copper ions contained in the aqueous composition is 40% by mass or less, preferably 25% by mass or less, 20% by mass or less, or 15% by mass or less, more preferably 12% by mass or less or 10% by mass. % or less, and may be 7.0% by mass or less, 5.0% by mass or less, or 3.0% by mass or less.
• the preferred concentration range of copper ions is preferably 0 to 3.0% by mass, preferably 0 to 2.5% by mass, more preferably 0 to 1.5% by mass, and still more preferably 0.1 to 1.5% by mass. 5% by mass, and may be 0.3 to 1.5% by mass or 0.5 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, 30% by mass, 25% by mass, 20% by mass, 17% by mass, 15% by mass, 10% by mass, 7% by mass, based on the total amount of the aqueous composition.
• the range of the concentration of copper ions can be selected from a range that is a combination of the above lower limit and upper limit as appropriate. By setting the concentration of copper ions within the above-mentioned range, the effects of the present invention tend to be more suitably achieved. On the other hand, if the concentration of copper ions in the aqueous composition is too high, the stainless steel after light treatment is prone to pinholes and areas of extremely thin thickness, while if the concentration of copper ions is too low, the formation of depressions in the surface , the weight reduction process 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.
• aqueous composition containing each of the above-mentioned components efficiently forms recesses on the surface of stainless steel, making it possible to reduce the weight, 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 then the substitution reaction products derived from copper ions are removed, leaving a relatively large amount on the surface of stainless steel. , it is thought that a large recess is formed.
• 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 weight reduction 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 stainless steel of the present invention has a density of less than 7.4 (g/cm 3 ) (7.40 g/cm 3 ).
• the density of the stainless steel of one embodiment of the present invention, for example, the stainless steel obtained by weight reduction treatment, is preferably 7.3 g/cm 3 , 7.29 g/cm 3 or less, less than 7.29 g/cm 3 , 7.
• the manufacturing method and weight reduction treatment method including the above-mentioned weight reduction treatment step can be easily manufactured by the manufacturing method and weight reduction treatment method including the above-mentioned weight reduction treatment step. That is, according to the above-mentioned weight-reducing treatment process, the weight-reducing treatment is carried out only in a substantially one-step process, that is, in which the aqueous composition of the present invention is brought into contact with the surface of the stainless steel to be treated, or as necessary. By simply further carrying out appropriate cleaning (for example, water cleaning), it is possible to obtain lightweight stainless steel with no significant change in thickness. Furthermore, as described above, the treatment conditions for the weight reduction treatment are mild and the time required is short, so that lightweight stainless steel can be efficiently obtained.
• lightweight and low-density stainless steel can be used, for example, in current collector foils for batteries such as solid-state batteries and lithium-ion batteries, solar cell substrates, flexible substrates for electronic devices, substrates for power storage devices, and exhaust gas. It can be used for purposes such as carriers for purification catalysts, electromagnetic shielding members, and heat radiating members.
• the weight-reduced 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 length and a width of 30 mm ⁇ 30 mm, and a material of SUS444 was prepared (Reference Example 1). In 55 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 and the density was 6.6 g/cm 3 . Further, when the surface shape was visually observed according to the above (confirmation of the presence or absence of pinholes), no pinholes (fine through holes) were observed, and the product was evaluated as "good.”
• Examples 2 to 7/Comparative Examples 1 to 4 Stainless steel foil was subjected to weight reduction 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 weight reduction treatment method were changed as shown in Table 1 below. I got it.
• 3.9 g and 12 g of copper sulfate pentahydrate (CuSO 4.5H 2 O) were used as a source of copper ions (Cu 2+ ), and in Comparative Examples 2 and 3, iron chloride ( III) 133 g and 133 g of hexahydrate (FeCl 3 .6H 2 O) were used, respectively.
• Table 1 shows the results such as the thickness and density of the surface-treated foil obtained.

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• 2023
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