USRE45821E1 - Zinc-based metal plated steel sheet - Google Patents

Zinc-based metal plated steel sheet Download PDF

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USRE45821E1
USRE45821E1 US14/319,298 US200814319298A USRE45821E US RE45821 E1 USRE45821 E1 US RE45821E1 US 200814319298 A US200814319298 A US 200814319298A US RE45821 E USRE45821 E US RE45821E
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steel sheet
znso
oxide layer
zinc
based metal
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Yoichi Makimizu
Sakae Fujita
Naoto Yoshimi
Masahiko Tada
Shinji Ootsuka
Hiroyuki Masuoka
Katsuya Hoshino
Hiroshi Kajiyama
Masayasu Nagoshi
Wataru Tanimoto
Kyoko Fujimoto
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JFE Steel Corp
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JFE Steel Corp
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    • C—CHEMISTRY; METALLURGY
    • C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
    • C23C—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THE SURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTION; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL
    • C23C2/00—Hot-dipping or immersion processes for applying the coating material in the molten state without affecting the shape; Apparatus therefor
    • C23C2/04—Hot-dipping or immersion processes for applying the coating material in the molten state without affecting the shape; Apparatus therefor characterised by the coating material
    • C23C2/06—Zinc or cadmium or alloys based thereon
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61F—FILTERS IMPLANTABLE INTO BLOOD VESSELS; PROSTHESES; DEVICES PROVIDING PATENCY TO, OR PREVENTING COLLAPSING OF, TUBULAR STRUCTURES OF THE BODY, e.g. STENTS; ORTHOPAEDIC, NURSING OR CONTRACEPTIVE DEVICES; FOMENTATION; TREATMENT OR PROTECTION OF EYES OR EARS; BANDAGES, DRESSINGS OR ABSORBENT PADS; FIRST-AID KITS
    • A61F13/00—Bandages or dressings; Absorbent pads
    • A61F13/15—Absorbent pads, e.g. sanitary towels, swabs or tampons for external or internal application to the body; Supporting or fastening means therefor; Tampon applicators
    • A61F13/51—Absorbent pads, e.g. sanitary towels, swabs or tampons for external or internal application to the body; Supporting or fastening means therefor; Tampon applicators characterised by the outer layers
    • A61F13/511—Topsheet, i.e. the permeable cover or layer facing the skin
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61F—FILTERS IMPLANTABLE INTO BLOOD VESSELS; PROSTHESES; DEVICES PROVIDING PATENCY TO, OR PREVENTING COLLAPSING OF, TUBULAR STRUCTURES OF THE BODY, e.g. STENTS; ORTHOPAEDIC, NURSING OR CONTRACEPTIVE DEVICES; FOMENTATION; TREATMENT OR PROTECTION OF EYES OR EARS; BANDAGES, DRESSINGS OR ABSORBENT PADS; FIRST-AID KITS
    • A61F13/00—Bandages or dressings; Absorbent pads
    • A61F13/15—Absorbent pads, e.g. sanitary towels, swabs or tampons for external or internal application to the body; Supporting or fastening means therefor; Tampon applicators
    • A61F13/51—Absorbent pads, e.g. sanitary towels, swabs or tampons for external or internal application to the body; Supporting or fastening means therefor; Tampon applicators characterised by the outer layers
    • A61F13/514—Backsheet, i.e. the impermeable cover or layer furthest from the skin
    • A61F13/51401—Backsheet, i.e. the impermeable cover or layer furthest from the skin characterised by the material
    • 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
    • C23C2/00—Hot-dipping or immersion processes for applying the coating material in the molten state without affecting the shape; Apparatus therefor
    • C23C2/26—After-treatment
    • 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
    • C23C2/00—Hot-dipping or immersion processes for applying the coating material in the molten state without affecting the shape; Apparatus therefor
    • C23C2/34—Hot-dipping or immersion processes for applying the coating material in the molten state without affecting the shape; Apparatus therefor characterised by the shape of the material to be treated
    • C23C2/36—Elongated material
    • C23C2/40—Plates; Strips
    • C—CHEMISTRY; METALLURGY
    • C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
    • C23C—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THE SURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTION; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL
    • C23C22/00—Chemical surface treatment of metallic material by reaction of the surface with a reactive liquid, leaving reaction products of surface material in the coating, e.g. conversion coatings, passivation of metals
    • C23C22/05—Chemical surface treatment of metallic material by reaction of the surface with a reactive liquid, leaving reaction products of surface material in the coating, e.g. conversion coatings, passivation of metals using aqueous solutions
    • C23C22/06—Chemical surface treatment of metallic material by reaction of the surface with a reactive liquid, leaving reaction products of surface material in the coating, e.g. conversion coatings, passivation of metals using aqueous solutions using aqueous acidic solutions with pH less than 6
    • C23C22/48—Chemical surface treatment of metallic material by reaction of the surface with a reactive liquid, leaving reaction products of surface material in the coating, e.g. conversion coatings, passivation of metals using aqueous solutions using aqueous acidic solutions with pH less than 6 not containing phosphates, hexavalent chromium compounds, fluorides or complex fluorides, molybdates, tungstates, vanadates or oxalates
    • C23C22/53—Treatment of zinc or alloys based thereon
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61F—FILTERS IMPLANTABLE INTO BLOOD VESSELS; PROSTHESES; DEVICES PROVIDING PATENCY TO, OR PREVENTING COLLAPSING OF, TUBULAR STRUCTURES OF THE BODY, e.g. STENTS; ORTHOPAEDIC, NURSING OR CONTRACEPTIVE DEVICES; FOMENTATION; TREATMENT OR PROTECTION OF EYES OR EARS; BANDAGES, DRESSINGS OR ABSORBENT PADS; FIRST-AID KITS
    • A61F13/00—Bandages or dressings; Absorbent pads
    • A61F13/15—Absorbent pads, e.g. sanitary towels, swabs or tampons for external or internal application to the body; Supporting or fastening means therefor; Tampon applicators
    • A61F13/51—Absorbent pads, e.g. sanitary towels, swabs or tampons for external or internal application to the body; Supporting or fastening means therefor; Tampon applicators characterised by the outer layers
    • A61F13/511—Topsheet, i.e. the permeable cover or layer facing the skin
    • A61F13/5116—Topsheet, i.e. the permeable cover or layer facing the skin being formed of multiple layers
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61F—FILTERS IMPLANTABLE INTO BLOOD VESSELS; PROSTHESES; DEVICES PROVIDING PATENCY TO, OR PREVENTING COLLAPSING OF, TUBULAR STRUCTURES OF THE BODY, e.g. STENTS; ORTHOPAEDIC, NURSING OR CONTRACEPTIVE DEVICES; FOMENTATION; TREATMENT OR PROTECTION OF EYES OR EARS; BANDAGES, DRESSINGS OR ABSORBENT PADS; FIRST-AID KITS
    • A61F13/00—Bandages or dressings; Absorbent pads
    • A61F13/15—Absorbent pads, e.g. sanitary towels, swabs or tampons for external or internal application to the body; Supporting or fastening means therefor; Tampon applicators
    • A61F13/51—Absorbent pads, e.g. sanitary towels, swabs or tampons for external or internal application to the body; Supporting or fastening means therefor; Tampon applicators characterised by the outer layers
    • A61F13/511—Topsheet, i.e. the permeable cover or layer facing the skin
    • A61F13/513—Topsheet, i.e. the permeable cover or layer facing the skin characterised by its function or properties, e.g. stretchability, breathability, rewet, visual effect; having areas of different permeability
    • A61F13/51305—Topsheet, i.e. the permeable cover or layer facing the skin characterised by its function or properties, e.g. stretchability, breathability, rewet, visual effect; having areas of different permeability having areas of different permeability
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T428/00—Stock material or miscellaneous articles
    • Y10T428/12—All metal or with adjacent metals
    • Y10T428/12493—Composite; i.e., plural, adjacent, spatially distinct metal components [e.g., layers, joint, etc.]
    • Y10T428/12535—Composite; i.e., plural, adjacent, spatially distinct metal components [e.g., layers, joint, etc.] with additional, spatially distinct nonmetal component
    • Y10T428/12611—Oxide-containing component
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T428/00—Stock material or miscellaneous articles
    • Y10T428/12—All metal or with adjacent metals
    • Y10T428/12493—Composite; i.e., plural, adjacent, spatially distinct metal components [e.g., layers, joint, etc.]
    • Y10T428/12771—Transition metal-base component
    • Y10T428/12785—Group IIB metal-base component
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T428/00—Stock material or miscellaneous articles
    • Y10T428/12—All metal or with adjacent metals
    • Y10T428/12493—Composite; i.e., plural, adjacent, spatially distinct metal components [e.g., layers, joint, etc.]
    • Y10T428/12771—Transition metal-base component
    • Y10T428/12785—Group IIB metal-base component
    • Y10T428/12792—Zn-base component
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T428/00—Stock material or miscellaneous articles
    • Y10T428/12—All metal or with adjacent metals
    • Y10T428/12493—Composite; i.e., plural, adjacent, spatially distinct metal components [e.g., layers, joint, etc.]
    • Y10T428/12771—Transition metal-base component
    • Y10T428/12785—Group IIB metal-base component
    • Y10T428/12792—Zn-base component
    • Y10T428/12799—Next to Fe-base component [e.g., galvanized]
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T428/00—Stock material or miscellaneous articles
    • Y10T428/26—Web or sheet containing structurally defined element or component, the element or component having a specified physical dimension
    • Y10T428/263—Coating layer not in excess of 5 mils thick or equivalent
    • Y10T428/264—Up to 3 mils
    • Y10T428/265—1 mil or less

Definitions

  • This disclosure relates to a zinc-based metal plated steel sheet excellent in tribological property during press forming.
  • Zinc-based metal plated steel sheets are widely used in many fields, in particular, for automobile bodies. When used for automobile bodies, they are subjected to press forming before use. Zinc-based metal plated steel sheets, however, have the disadvantage that their press formability is inferior to that of cold-rolled steel sheets. This is because in a press die, the friction resistance of a surface-treated steel sheet is larger than that of a cold-rolled steel sheet. That is, the surface-treated steel sheet does not smoothly flow into the die at a portion of the surface-treated steel sheet having a large friction resistance to the die and a bead. This is liable to cause rupture of the steel sheet.
  • High-tensile steel sheets have press formability inferior to that of mild steel sheets.
  • high-tensile steel sheets are easily ruptured at portions of high-tensile steel sheets having a large friction resistance to dies and beads.
  • Galvannealed steel sheets are excellent in weldability and paintability compared with galvanized steel sheets and, thus, more preferably used for automobile bodies.
  • a galvannealed steel sheet is produced as follows: a steel sheet is subjected to galvanizing and then heat treatment. As a result, an alloying reaction in which Fe in the steel sheet and Zn in a plating layer are diffused occurs, thereby forming a Fe—Zn alloy phase.
  • the Fe—Zn alloy phase is in the form of a layer usually including a ⁇ phase, ⁇ 1 phase, and a ⁇ phase. Hardness and a melting point tend to decrease as the Fe concentration decreases, i.e., in a sequence of the ⁇ phase ⁇ the ⁇ 1 phase ⁇ the ⁇ phase.
  • a high-hardness, high-melting point film with high Fe concentration is effective from the viewpoint of achieving good tribological properties because adhesion does not easily occur.
  • Galvannealed steel sheets with the emphasis on press formability are produced in such a manner that average Fe concentrations in films are relatively high.
  • Japanese Unexamined Patent Application Publication Nos. 53-60332 and 2-190483 each disclose a technique for improving weldability or processability by subjecting surfaces of a zinc-based metal plated steel sheet to electrolytic treatment, immersion treatment, coating and oxidation treatment, or heat treatment to form an oxide film mainly composed of ZnO.
  • Japanese Unexamined Patent 4-88196 discloses a technique for improving press formability and chemical conversion treatability by immersing surfaces of a zinc-based metal plated steel sheet in an aqueous solution containing 5 to 60 g/L sodium phosphate and having a pH of 2 to 6, electrolytic treatment, or applying the solution described above to form an oxide film mainly composed of a P oxide.
  • Japanese Unexamined Patent Application Publication No. 3-191093 discloses a technique for improving press formability and chemical conversion treatability by subjecting surfaces of a zinc-based metal plated steel sheet to electrolytic treatment, immersion treatment, coating, coating and oxidation treatment, or heat treatment to form a Ni oxide.
  • Japanese Unexamined Patent Application Publication No. 2003-306781 discloses a technique for improving tribological properties by bringing a galvannealed steel sheet into contact with an acidic solution to form an oxide mainly composed of Zn on surfaces of the steel sheet and suppress adhesion between a plating layer and a press die.
  • the technique for improving press formability by forming an oxide mainly composed of Zn on surfaces of steel sheet disclosed in Japanese Unexamined Patent Application Publication No. 2003-306781 and the like has the advantage over the technique using Ni and the like disclosed in Japanese Unexamined Patent Application Publication No. 3-191093 in production cost and environmental loading because Zn contained in the plated steel sheet is mainly used.
  • a high degree of press formability is required, so that further improvement in tribological property may be required.
  • FIG. 1 is a schematic front view of an apparatus for measuring a coefficient of friction.
  • FIG. 2 is a schematic perspective view of the shape and dimensions of a bead shown in FIG. 1 .
  • FIG. 3 is a schematic perspective view of the shape and dimensions of a bead shown in FIG. 1 .
  • a flat portion on a surface of a galvannealed steel sheet is a portion with which a die comes into direct contact during press forming.
  • the presence of a hard and high-melting-point material that prevents adhesion to the die is important in improving tribological properties.
  • a hot-dip galvanized steel sheet and an electrogalvanized steel sheet which have surface irregularities smaller than those of the galvannealed steel sheet each of their surfaces is naturally a portion with which a die comes into direct contact during press forming.
  • the presence of a hard and high-melting-point material in their surface layers is important for improving tribological properties.
  • an oxide layer on a surface layer is effective in improving tribological properties.
  • An oxide layer containing crystalline 3Zn(OH) 2 ⁇ ZnSO 4 ⁇ xH 2 O is very effective.
  • an oxide layer containing crystalline 3Zn(OH) 2 ⁇ ZnSO 4 ⁇ 3-5H 2 O is significantly effective.
  • Whether crystalline 3Zn(OH) 2 ⁇ ZnSO 4 ⁇ 3-5H 2 O is present in the oxide layer or not was determined by measuring an X-ray diffraction pattern of the oxide layer using X-ray diffractometry for a thin film and checking the resulting pattern against a standard pattern described in an ICDD card.
  • a thickness of the oxide layer on the surface plating layer of 10 nm or more results in a zinc-based metal plated steel sheet having good tribological properties.
  • a thickness of 20 nm or more is more effective. This is because the oxide layer remains even if the oxide layer on the surface layer is worn in press forming in which the contact area between a die and a workpiece is large, thus not leading to a reduction in tribological properties.
  • the upper limit of the thickness is not set.
  • a thickness exceeding 200 nm results in a reduction in etch rate with a chemical conversion treatment liquid even when the oxide layer has Zn—OH bonds, thus leading to difficulty in the formation of a dense, uniform chemical conversion film.
  • the thickness is therefore desirably 200 nm or less.
  • the most effective method for forming an oxide layer containing crystalline 3Zn(OH) 2 ⁇ ZnSO 4 ⁇ 3-5H 2 O on a surface of a zinc-based metal plated steel sheet uses a reaction with an aqueous solution.
  • a liquid film of a solution containing Zn ions and sulfate ions is formed on a surface of a steel sheet and allowed to stand for a predetermined time, thereby forming the oxide layer containing crystalline 3Zn(OH) 2 ⁇ ZnSO 4 ⁇ 3-5H 2 O on the surface.
  • crystalline 3Zn (OH) 2 ⁇ ZnSO 4 ⁇ 3-5H 2 O is not formed.
  • the coating weight of a zinc-based metal plated steel sheet including an oxide layer on a surface of the sheet is preferably in the range of 20 to 150 g/m 2 per surface.
  • the reason for this is as follows: At an amount of the plating film of less than 20 g/m 2 , the steel sheet has low resistance to corrosion because of a small amount of the plating film An amount of the plating film exceeding 150 g/m 2 results in sufficient resistance to corrosion but may cause peeling of the plating film during processing.
  • the Fe concentration in the plating film of the galvannealed steel sheet is preferably in the range of 6% to 14% by mass.
  • the reason for this is as follows: At an Fe concentration of less than 6% by mass, a pure Zn phase ( ⁇ phase) remains on the surface, so that the weldability, the paintability, and the like cannot be satisfied. On the other hand, an Fe concentration exceeding 14% by mass results in the formation of a thick ⁇ phase at the interface between the plating film and the steel sheet, thereby reducing adhesion of the plating film.
  • the Al concentration needs to be in the range of 0.05% to 0.40% by mass.
  • a plating bath For a hot-dip galvanized steel sheet, it is important that a plating bath contain Al in an appropriate amount in order that a thick alloy layer is not formed at the interface between the plating film and the steel sheet.
  • the Al concentration needs to be in the range of 0.15% to 0.40% by mass.
  • the proportion of the area of a flat portion with respect to a plated surface is desirably in the range of 20% to 80%. At less than 20%, the contact area between a die and a portion (recessed portion) except for the flat portion is increased. With respect to the area of a portion in actual contact with the die, the proportion of the area of the flat portion where an oxide thickness can be assuredly controlled is reduced, thus reducing the effect of improving press formability.
  • the portion except for the flat portion serves to hold press oil during press forming. Thus, when the proportion of the area of the portion except for the flat portion is less than 20% (when the proportion of the area of the flat portion exceeds 80%), the lack of oil can easily occur during press forming, so that the effect of improving press formability is reduced.
  • a plating bath needs to contain Al.
  • additive element components other than Al are not particularly limited. That is, even if Pb, Sb, Si, Sn, Mg, Mn, Ni, Ti, Li, Cu, and other elements are contained or added in addition to Al, the effect is not impaired.
  • a plating bath may mainly contain zinc.
  • the plating bath may contain other metals and oxides as long as the effect is not impaired.
  • a high-tensile steel sheet as an underlying steel sheet provides an effect such as a reduction in weight and is thus preferred.
  • a concept regarding a reduction in the weight of an automobile body is that the use of the high-tensile steel sheet can reduce the weight of components (reduction in thickness of the sheet) while the crash performance of the body is maintained.
  • press formability tends to decrease as increasing tensile strength.
  • the high-tensile steel sheet apparently has inferior press formability.
  • the type of steel sheet is not particularly limited. To sufficiently provide the effect of the reduction in weight, application to a high-tensile steel sheet having a tensile strength of 340 MPa or more is preferred.
  • a plating film having a coating weight of 60 g/m 2 , an Fe concentration of 10% by mass, and an Al concentration of 0.20% by mass was formed by a common galvannealing process on a cold-rolled steel sheet having a thickness of 0.8 mm. Then the steel sheet was subjected to skin pass rolling. In this case, the proportion of the area of a flat portion varied slightly with sampling positions but was in the range of 40% to 60%.
  • Oxidation treatment was performed as follows: The galvannealed steel sheet was immersed in an aqueous solution containing zinc sulfate heptahydrate. The amount of a liquid film attached on a surface was controlled with a rubber roll so as to be 10 g/m 2 . The resulting steel sheet was allowed to stand in air for 10 to 60 seconds, washed with water, and dried. For comparison purposes, an aqueous solution containing zinc nitrate hexahydrate and an acidic solution containing sodium acetate and ferrous sulfate were used. The temperature of all solutions used for the treatment was set to 35° C.
  • a hot-dip galvanized steel sheet and an electrogalvanized steel sheet that have a thickness of 0.8 mm were prepared.
  • a plating film having a coating weight of 70 g/m 2 was formed by a common hot-dip galvanizing process on the hot-dip galvanized steel sheet.
  • the resulting steel sheet was subjected to skin pass rolling.
  • a plating film having a coating weight of 50 g/m 2 was formed by a common electrogalvanizing process on the electrogalvanized steel sheet.
  • Oxidation treatment was performed as follows: Each of the hot-dip galvanized steel sheet and the electrogalvanized steel sheet was immersed in an aqueous solution containing zinc sulfate heptahydrate. The amount of a liquid film attached on a surface was controlled with a rubber roll so as to be 10 g/m 2 . The resulting steel sheet was allowed to stand in air for 10 to 60 seconds, washed with water, and dried. The temperature of all solutions used for the treatment was set to 35° C.
  • FIG. 1 is a schematic front view of an apparatus for measuring a coefficient of friction.
  • a sample 1 taken from the steel sheet, used for measuring a coefficient of friction was fixed to a sample stage 2 .
  • the sample stage 2 was fixed to an upper surface of a slide table 3 that was movable horizontally.
  • a slide-table support 5 that was movable vertically was provided and had rollers 4 in contact with a lower surface of the slide table 3 .
  • a bead 6 imposed a pressing load N on the sample 1 for measuring a coefficient of friction.
  • a first load cell 7 for measuring the pressing load N was attached to the slide-table support 5 .
  • a second load cell 8 for measuring a friction resistance F that allowed the slide table 3 to move horizontally while the pressing load was being imposed on the sample was attached to an end of the slide table 3 .
  • lubricant oil wash oil for press, Preton (registered trademark) R352L manufactured by Sugimura Chemical Industrial Co., Ltd. was applied to surfaces of the sample 1 , and then the test was performed.
  • FIG. 2 is a schematic perspective view of the shape and dimensions of the bead used. Sliding was performed while the undersurface of the bead 6 is pressed against a surface of the sample 1 .
  • the width was 10 mm
  • the length in the sliding direction of the sample was 12 mm.
  • Lower ends in the sliding direction were in the form of curved surfaces each having a curvature of 4.5 mmR.
  • the undersurface of the bead against which the sample was pressed was in the form of a plane with a width of 10 mm and a length in the sliding direction of 3 mm.
  • the bead shown in FIG. 2 was used.
  • the pressing load N was set to 400 kgf.
  • the speed of movement of each sample was set to 100 cm/min.
  • the bead shown in FIG. 2 was used.
  • the pressing load N was set to 400 kgf.
  • the speed of movement of the sample was set to 20 cm/min.
  • Measurement of the thickness of each oxide layer was performed with an X-ray fluorescence analyzer. A voltage and a current applied to a tube during measurement were 30 kV and 100 mA, respectively. An analyzing crystal was set to TAP to detect the O-K ⁇ ray. In the case of the measurement of the O-K ⁇ ray, intensities at the background in addition to the peak position were measured to calculate the net intensity of the O-K ⁇ ray. An integral time at each of the peak position and the background was set to 20 seconds.
  • Silicon wafer pieces formed by cleavage and including silicon oxide films having a thickness of 96 nm, 54 nm, and 24 nm were placed on the sample stage together with the samples to calculate the intensity of the O-K ⁇ ray on the basis of the silicon oxide films.
  • a calibration curve showing the relationship between the thickness of the oxide film and the intensity of the O-K ⁇ ray was formed on the basis of the data. The thickness of the oxide layer of each sample was calculated in terms of the thickness of the silicon oxide film
  • the presence of crystalline 3Zn(OH) 2 ⁇ ZnSO 4 ⁇ 3-5H 2 O was determined by an X-ray diffractometry for a thin film.
  • An X-ray diffraction pattern was measured by a thin-film method using the Cu-K ⁇ ray at an incident angle of 0.5° .
  • a diffraction peak corresponding to a crystal structure of 3Zn(OH) 2 ⁇ ZnSO 4 ⁇ 3-5H 2 O was observed at a diffraction angle (2 ⁇ ) of about 8° to about 12°.
  • the presence of crystalline 3Zn(OH) 2 ⁇ ZnSO 4 ⁇ 3-5H 2 O was determined on the basis of the intensity ratio of the diffraction peak to a diffraction peak that was observed at about 42° and that originated from an alloy layer of iron and zinc. It was determined that a film containing crystalline 3Zn(OH) 2 ⁇ ZnSO 4 ⁇ 3-5H 2 O was formed when a peak intensity ratio, i.e., (peak intensity of 3Zn(OH) 2 ⁇ ZnSO 4 ⁇ 3-5H 2 O)/(peak intensity of the alloy of iron and zinc), of 0.020 or more was obtained, wherein the peak intensities calculated by subtracting their respective backgrounds were used.
  • a peak intensity ratio i.e., (peak intensity of 3Zn(OH) 2 ⁇ ZnSO 4 ⁇ 3-5H 2 O)/(peak intensity of the alloy of iron and zinc
  • the presence of crystalline 3Zn (OH) 2 ⁇ ZnSO 4 ⁇ 3-5H 2 O was determined on the basis of the intensity ratio of a diffraction peak that corresponded to a crystal structure of 3Zn(OH) 2 ⁇ ZnSO 4 ⁇ 3-5H 2 O and that was observed at a diffraction angle (2 ⁇ ) of about 8° to about 12° to a diffraction peak that was observed at about 36° and that originated from a zinc ⁇ layer.
  • Table 1 shows conditions of the oxidation treatment for the galvannealed steel sheet and the results.
  • Table 2 shows conditions of the oxidation treatment for the hot-dip galvanized steel sheet and the electrogalvanized steel sheet and the results.
  • the oxide layer had a thickness of less than 10 nm. An oxide film adequate to improve tribological properties was not formed on a flat portion, thus leading to a high coefficient of friction.
  • the peak intensity ratio was 0.020 or more.
  • the oxide layer containing crystalline 3Zn(OH) 2 ⁇ ZnSO 4 ⁇ 3-5H 2 O was formed and had a thickness of 10 nm or more, so that the coefficient of friction was stabilized at a low level, thus sufficiently improving tribological properties.
  • Galvannealed steel sheets having different strength levels and each having a thickness of 1.2 mm were used. Oxidation treatment was performed as follows: Each of the galvannealed steel sheets was immersed in an aqueous solution (pH: 5.5, temperature: 35° C.) containing zinc sulfate heptahydrate (concentration: 20 g/L). The amount of a liquid film attached on a surface was controlled with a rubber roll so as to be 10 g/m 2 . The resulting steel sheet was allowed to stand in air for 10 to 60 seconds, washed with water, and dried.
  • Galvannealing was performed by a common alloying treatment to form a plating film having a coating weight of 45 to 50 g/m 2 and an Fe concentration of 10% to 11% by mass. Then skin pass rolling was performed in such a manner that the proportion of the area of a flat portion was in the range of 40% to 60%.
  • a tensile test was performed in compliance with JIS Z2241 using No. 5 test pieces according to JIS Z2201, a longitudinal direction (tensile direction) of each of the test pieces being defined as a direction perpendicular to the rolling direction.
  • the bead shown in FIG. 3 was used.
  • the pressing load N was set to 400 kgf.
  • the speed of movement of each sample was set to 120 cm/min.
  • a spherical stretch forming test of each sample having a size of 200 mm ⁇ 200 mm was performed with a punch having a diameter of 150 mm (diameter of a die: 153 mm) to measure the maximum height of a formed portion when the rupture of the sample occurred.
  • a fold pressure of 100 ton was applied.
  • lubricant oil wash oil for press, Preton (registered trademark) R352L manufactured by Sugimura Chemical Industrial Co., Ltd. was applied to the sample.
  • Table 3 shows conditions of the oxidation treatment and the results.
  • the oxide layer had a thickness of less than 10 nm.
  • An oxide film adequate to improve tribological properties was not formed on a flat portion, thus leading to a high coefficient of friction.
  • the peak intensity ratio was 0.020 or more.
  • the oxide layer containing crystalline 3Zn(OH) 2 ⁇ ZnSO 4 ⁇ 3-5H 2 O was formed and had a thickness of 10 nm or more, so that the coefficient of friction was stabilized at a low level, thus sufficiently improving tribological properties.
  • the zinc-based metal plated steel sheet is excellent in tribological properties and press formability and can thus be applied in many fields, in particular, for automobile bodies.

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JP7375794B2 (ja) * 2020-09-09 2023-11-08 Ｊｆｅスチール株式会社 鋼板
JP7375795B2 (ja) * 2020-09-09 2023-11-08 Ｊｆｅスチール株式会社 プレス成形品の製造方法
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WO2024105887A1 (fr) * 2022-11-18 2024-05-23 日本電信電話株式会社 Procédé de formation de revêtement protecteur et appareil de formation de revêtement protecteur

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