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 manufacturing method for stainless steel, a method for weight reduction treatment of stainless steel, stainless steel and an aqueous composition, and particularly relates to low-density stainless steel and a manufacturing method therefor, a weight reduction treatment method, and an aqueous composition useful for weight reduction of stainless steel.
• stainless steel Because of its properties excellent in durability and weather resistance, stainless steel has recently been considered for application in various fields. For example, stainless steel is coming into widespread use in electronic components, battery current collector foils and automotive component housings.
• the density D 1 (g/cm 3 ) of stainless steel undergoing the weight reduction treatment compared with the density D 2 (g/cm 3 ) of the same stainless steel without undergoing the weight reduction treatment is preferably 0.95-fold or less (i.e., D 1 /D 2 ⁇ 0.95), more preferably 0.93-fold or less or 0.91-fold or less, even more preferably 0.90-fold or less or 0.88-fold or less, and particularly preferably 0.85-fold or less, 0.82-fold or less or 0.80-fold or less.
• the lower limit of the ratio of densities before and after the weight reduction treatment (D 1 /D 2 ) will vary depending on the intended purpose of use and is not limited in any way, but it is usually preferably 0.16-fold or more in terms of durability and weather resistance.
• examples include those defined in JIS G4305, as exemplified by chromium-nickel stainless steel including SUS304, SUS316, SUS321, SUS347, and SUS329J1; ferrite stainless steel (chromium stainless steel) including SUS405, SUS430, SUS434, SUS444, SUS447, and SUSXM27; and precipitation hardening stainless steel (chromium-nickel stainless steel) including SUS630, SUS631, and SUH660.
• the above aqueous composition is brought into contact with stainless steel to be treated.
• the time required for 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 weight reduction treatment of stainless steel of the present invention is advantageous in that the weight reduction of stainless steel proceeds even within not so long time.
• the time required for weight reduction treatment is intended to mean the time during which the aqueous composition is in contact with the surface of stainless steel. For example, it means the time during which stainless steel is soaked in the aqueous composition, or the time required from spraying the aqueous composition over the surface of stainless steel until removing the aqueous composition by water washing, etc.
• Any method may be used to bring the aqueous composition into contact with the surface of stainless steel.
• the aqueous composition may be sprayed over stainless steel processed into a specific shape to obtain weight-reduced stainless steel, or alternatively, an apparatus for adding dropwise, spraying or soaking the aqueous composition is provided between stainless steel foil rolls, and a stainless steel foil is passed near the above apparatus to supply the aqueous composition during being conveyed in a roll-to-roll fashion from the roll around which the untreated stainless steel foil has been wound, and the weight-reduced stainless steel foil is then wound around the other roll.
• the above weight reduction treatment step not only serves as a part of the manufacturing method for stainless steel, but is also useful as a post-treatment for the manufactured stainless steel, etc., by way of example.
• the method for weight reduction treatment of stainless steel of the present invention comprises the weight reduction treatment step described above.
• the properties and type of stainless steel, the components of the aqueous composition, and conditions for the weight reduction treatment are as described above.
• the aqueous composition of the present invention is preferred for use in the manufacturing method for stainless steel or the method for weight reduction treatment of stainless steel described above.
• the aqueous composition of the present invention comprises 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, each based on the total amount of the aqueous composition.
• the aqueous composition may comprise water, etc., especially ion exchanged water or ultrapure water.
• Hydrogen peroxide to be contained in the aqueous composition is usually provided as an aqueous solution of appropriate concentration for admixture with other components.
• concentration of hydrogen peroxide in an aqueous hydrogen peroxide solution for use in the preparation of the aqueous composition is not limited in any way, and it may be for example 10% to 90%, and is preferably 35% to 60% in line with the industrial standards.
• hydrogen peroxide may contain a stabilizer in an amount up to around 0.01% by mass, and acceptable stabilizers include sulfuric acid, phosphoric acid and so on.
• Hydrogen peroxide may be prepared in any manner and may be available through any route. For example, hydrogen peroxide prepared by the anthraquinone method may be used.
• the concentration of hydrogen peroxide in the aqueous composition is 0.1% to 5.0% by mass based on the total amount (total mass) of the aqueous composition, but it is preferably 0.2% to 4.5% by mass, more preferably 0.3% to 4.5% by mass or 0.2% to 4.0% by mass, even more preferably 0.35% to 3.0% by mass or 0.3% to 3.5% by mass, and particularly preferably 0.4% to 2.0% by mass, 0.45% to 1.5% by mass, 0.45% to 1.2% by mass or 0.5% to 1.0% by mass, based on the total amount (total mass) of the aqueous composition.
• the lower limit of the concentration of hydrogen peroxide in the aqueous composition may be, for example, 0.001% by mass, 0.01% by mass, 0.05% by mass, 0.15% by mass, 0.2% by mass, 0.25% by mass, 0.3% by mass, 0.35% by mass, 0.4% by mass, 0.45% by mass or 0.5% 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 may be, for example, 4.8% by mass, 4.5% by mass, 4.2% by mass, 4.0% by mass, 3.8% by mass, 3.5% by mass, 3.2% by mass, 3.0% by mass, 2.8% by mass, 2.5% by mass, 2.2% by mass, 2.0% by mass, 1.8% by mass, 1.5% by mass, 1.2% by mass, 1.0% by mass, etc., based on the total amount (total mass) of the aqueous composition.
• the concentration range of hydrogen peroxide may be selected as appropriate from the above lower and upper limits combined.
• the concentration of hydrogen peroxide from among the ranges mentioned above, the effect of the present invention tends to be achieved in a more preferred manner, and even when copper ions, halide ions and others described later are also contained in the aqueous composition, the possibility of heat generation or bubble formation associated with the decomposition of hydrogen peroxide can be suppressed to thereby ensure the safety of operation.
• Halide ions to be contained in the aqueous composition may be of any type, and examples include fluoride ions, chloride ions, bromide ions and iodide ions, with chloride ions being more preferred in terms of easy handling and cost effectiveness.
• Halogen compounds supplying halide ions are not limited in any way, and examples include hydrochloric acid, alkali metal halides (e.g., sodium halides and potassium halides), alkaline earth metal halides (e.g., calcium halides), ammonium halides, copper halides, and hydrogen halides.
• alkali metal halides e.g., sodium halides and potassium halides
• alkaline earth metal halides e.g., calcium halides
• ammonium halides copper halides
• hydrogen halides e.g., sodium halides and potassium halides
• preferred are hydrochloric acid, alkali metal halides or hydrogen halides in terms of more effectively and reliably providing the effect of the present invention, and more preferred is hydrochloric acid or sodium chloride.
• the concentration of halide ions in the aqueous composition is 1% to 30% by mass based on the total amount (total mass) of the aqueous composition, but it is preferably 2.0% to 25% by mass, more preferably 4.0% to 22% by mass or 3.0% to 20% by mass, and particularly preferably 5.0% to 15% by mass, 8% to 15% by mass, or 10% to 15% by mass, based on the total amount (total mass) of the aqueous composition.
• the surface-treated stainless foils in the following examples and comparative examples, and the untreated stainless foils in Reference Examples 1 to 4 were measured for their thickness with a digital micrometer (manufactured by Mitutoyo Corporation, Japan; MDC-25MXT).

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• Chemical & Material Sciences (AREA)
• Engineering & Computer Science (AREA)
• Materials Engineering (AREA)
• Mechanical Engineering (AREA)
• Metallurgy (AREA)
• Organic Chemistry (AREA)
• Chemical Kinetics & Catalysis (AREA)
• General Chemical & Material Sciences (AREA)
• Chemical Treatment Of Metals (AREA)
• Heat Treatment Of Steel (AREA)

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• 2023
  • 2023-09-14 JP JP2024547370A patent/JPWO2024058249A1/ja active Pending
  • 2023-09-14 CN CN202380065196.XA patent/CN119855943A/zh active Pending
  • 2023-09-14 WO PCT/JP2023/033575 patent/WO2024058249A1/ja not_active Ceased
  • 2023-09-14 KR KR1020257010258A patent/KR20250067837A/ko active Pending
  • 2023-09-14 TW TW112134979A patent/TW202428940A/zh unknown
  • 2023-09-14 EP EP23865598.9A patent/EP4589049A1/en active Pending

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