WO2024257414A1 - Tôle d'acier destinée à des boîtes de conserve - Google Patents

Tôle d'acier destinée à des boîtes de conserve Download PDF

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Publication number
WO2024257414A1
WO2024257414A1 PCT/JP2024/007285 JP2024007285W WO2024257414A1 WO 2024257414 A1 WO2024257414 A1 WO 2024257414A1 JP 2024007285 W JP2024007285 W JP 2024007285W WO 2024257414 A1 WO2024257414 A1 WO 2024257414A1
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WIPO (PCT)
Prior art keywords
protrusions
steel sheet
chromium
cans
size
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Pending
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PCT/JP2024/007285
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English (en)
Japanese (ja)
Inventor
勇人 川村
祐介 中川
卓嗣 植野
雄也 馬場
直哉 清兼
方成 友澤
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JFE Steel Corp
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JFE Steel Corp
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Publication date
Application filed by JFE Steel Corp filed Critical JFE Steel Corp
Priority to CN202480035624.9A priority Critical patent/CN121263559A/zh
Priority to JP2024534484A priority patent/JP7563659B1/ja
Priority to KR1020257037725A priority patent/KR20260002883A/ko
Publication of WO2024257414A1 publication Critical patent/WO2024257414A1/fr
Anticipated expiration legal-status Critical
Pending legal-status Critical Current

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    • C—CHEMISTRY; METALLURGY
    • C25—ELECTROLYTIC OR ELECTROPHORETIC PROCESSES; APPARATUS THEREFOR
    • C25D—PROCESSES FOR THE ELECTROLYTIC OR ELECTROPHORETIC PRODUCTION OF COATINGS; ELECTROFORMING; APPARATUS THEREFOR
    • C25D11/00—Electrolytic coating by surface reaction, i.e. forming conversion layers
    • C25D11/38—Chromatising
    • C—CHEMISTRY; METALLURGY
    • C25—ELECTROLYTIC OR ELECTROPHORETIC PROCESSES; APPARATUS THEREFOR
    • C25D—PROCESSES FOR THE ELECTROLYTIC OR ELECTROPHORETIC PRODUCTION OF COATINGS; ELECTROFORMING; APPARATUS THEREFOR
    • C25D5/00—Electroplating characterised by the process; Pretreatment or after-treatment of workpieces
    • C25D5/16—Electroplating with layers of varying thickness
    • C—CHEMISTRY; METALLURGY
    • C25—ELECTROLYTIC OR ELECTROPHORETIC PROCESSES; APPARATUS THEREFOR
    • C25D—PROCESSES FOR THE ELECTROLYTIC OR ELECTROPHORETIC PRODUCTION OF COATINGS; ELECTROFORMING; APPARATUS THEREFOR
    • C25D5/00—Electroplating characterised by the process; Pretreatment or after-treatment of workpieces
    • C25D5/34—Pretreatment of metallic surfaces to be electroplated
    • C25D5/36—Pretreatment of metallic surfaces to be electroplated of iron or steel
    • C—CHEMISTRY; METALLURGY
    • C25—ELECTROLYTIC OR ELECTROPHORETIC PROCESSES; APPARATUS THEREFOR
    • C25D—PROCESSES FOR THE ELECTROLYTIC OR ELECTROPHORETIC PRODUCTION OF COATINGS; ELECTROFORMING; APPARATUS THEREFOR
    • C25D9/00—Electrolytic coating other than with metals
    • C25D9/04—Electrolytic coating other than with metals with inorganic materials
    • C25D9/08—Electrolytic coating other than with metals with inorganic materials by cathodic processes
    • C25D9/10—Electrolytic coating other than with metals with inorganic materials by cathodic processes on iron or steel

Definitions

  • the present invention relates to steel sheets for cans.
  • Patent Document 1 discloses a steel sheet for cans that has "a metallic chromium layer and a hydrated chromium oxide layer on the surface of the steel sheet, in that order from the steel sheet side," and further, the metallic chromium layer has "granular protrusions.”
  • a steel sheet for cans having granular protrusions is expected to exhibit good paint adhesion (adhesion to paint applied to the surface of the steel sheet for cans) because the anchor effect of the granular protrusions improves adhesion to paint.
  • paint adhesion adheresion to paint applied to the surface of the steel sheet for cans
  • an object of the present invention is to provide a steel sheet for cans which is excellent in paint adhesion and surface appearance.
  • a steel sheet for cans comprising a surface of a steel sheet having, in this order from the steel sheet side, a metallic chromium layer and a chromium hydrated oxide layer, the metallic chromium layer having a coating weight of 50 to 200 mg/ m2 , the chromium-equivalent coating weight of the chromium hydrated oxide layer being 3 to 50 mg/ m2 , the metallic chromium layer including a flat portion and a protrusion portion provided on the flat portion, the protrusion portion having a minimum birth size of -500 nm or more, a number of the protrusion portions having a death size of 0 nm or more and less than 750 nm being 1.0 to 10.0 protrusions/ ⁇ m2 , and a number of the protrusion
  • the present invention provides steel sheets for cans that have excellent paint adhesion and surface appearance.
  • FIG. 1 is a cross-sectional view that typically shows a steel sheet for cans.
  • 1 is a SEM image of a steel sheet for cans.
  • 1 is a zero-order persistence diagram of a protrusion of a steel sheet for cans. This is a histogram of death size.
  • FIG. 1 is a cross-sectional view that typically shows a steel sheet for cans 1.
  • the steel sheet for cans 1 has a steel sheet 2.
  • the steel sheet for cans 1 further has, on the surface of the steel sheet 2, a metal chromium layer 3 and a chromium hydrate oxide layer 4 in this order from the steel sheet 2 side.
  • the metal chromium layer 3 includes a flat portion 3a having a flat plate shape covering the steel plate 2, and protruding portions 3b provided on the flat portion 3a.
  • the chromium hydrated oxide layer 4 is disposed on the metal chromium layer 3 so as to follow the shape of the protruding portions 3b.
  • the type of steel plate is not particularly limited. Steel plates that are usually used as container materials (e.g., low carbon steel plates, ultra-low carbon steel plates) can be used.
  • the manufacturing method and material of the steel plate are not particularly limited.
  • the steel plate is manufactured through a normal steel slab manufacturing process, followed by hot rolling, pickling, cold rolling, annealing, temper rolling, and other processes.
  • a metal chromium layer is disposed on the surface of the above-mentioned steel sheet.
  • the metal chromium layer reduces the surface exposure of the steel sheet and improves corrosion resistance.
  • the coating weight of the metal chromium layer is 50 mg/ m2 or more, preferably 70 mg/m2 or more , and more preferably 80 mg/ m2 or more.
  • the coating weight is the coating weight per one side of the steel sheet (hereinafter the same).
  • the coating weight of the metal chromium layer is 200 mg/ m2 or less, preferably 180 mg/m2 or less , and more preferably 160 mg/m2 or less .
  • the coating weight of the metallic chromium layer and the coating weight in terms of chromium of the hydrated chromium oxide layer described below are measured as follows. First, the chromium amount (total chromium amount) of the steel sheet for cans on which the metallic chromium layer and the chromium hydrate oxide layer are formed is measured using an X-ray fluorescence device.
  • the steel sheet for cans is subjected to an alkali treatment by immersing it in a 6.5N aqueous sodium hydroxide solution (liquid temperature: 90°C) for 10 minutes, and then the chromium amount (amount of chromium after alkali treatment) is measured again using an X-ray fluorescence device.
  • the amount of chromium after alkali treatment is defined as the amount of deposition of the metallic chromium layer.
  • (amount of alkali-soluble chromium) (total amount of chromium)-(amount of chromium after alkali treatment) is calculated, and the amount of alkali-soluble chromium is regarded as the amount of deposition of the chromium hydrous oxide layer in terms of chromium.
  • Such a metal chrome layer includes a flat portion and a protrusion portion provided on the flat portion. Next, each of these portions contained in the metal chrome layer will be described in detail.
  • the flat portion of the metal chromium layer mainly covers the surface of the steel plate and improves the corrosion resistance. It is preferable that the flat portion of the metal chromium layer has a sufficient thickness so that when the steel sheets for cans inevitably come into contact with each other during handling, the protrusions provided on the surface layer do not destroy the flat portion to expose the steel sheet.
  • the coating amount of the metal chromium layer on the flat plate portion is preferably 10 mg/m2 or more , more preferably 30 mg/m2 or more , and even more preferably 40 mg/m2 or more.
  • the protrusions of the metal chromium layer are formed on the surface of the above-mentioned flat plate portion and improve paint adhesion. This is believed to be because the anchor effect of the protrusions improves the adhesion to the paint applied to the surface of the steel sheet for cans.
  • the state of the protrusions can be evaluated by creating a zero-order persistent diagram using the persistent homology method as follows. First, the protrusions are observed using a scanning electron microscope (SEM) to obtain an SEM image (a planar image of the steel sheet for cans). The SEM observation is performed at a magnification at which 500 or more protrusions can be confirmed within one field of view.
  • FIG. 2 is an SEM image of a steel sheet for cans, and it can be seen that regions with sparse protrusions and regions with dense protrusions are mixed together.
  • the obtained SEM image is subjected to image processing to extract the protrusions, which may be extracted by hand painting.
  • a calculation for creating a zeroth-order persistent diagram is performed using a known persistent homology method, for example, as follows. First, using an SEM image in which protrusions are extracted, the boundary between the protrusions and non-protrusions is set to 0 nm, and the distance that increases in the negative direction for the protrusions and in the positive direction for the non-protrusions is calculated as the distance increases with distance from the boundary. This results in a distance distribution in which the boundary between the protrusions and non-protrusions is set to 0 nm.
  • a space filling operation is performed starting from the maximum value in the negative direction of the distance distribution, and the distance when a new point is born in the space is recorded as the birth size, and the distance when the points are connected is recorded as the death size. That is, the absolute value of the birth size corresponds to the radius of the protrusion, and a small birth size means that the diameter of the protrusion is large. On the other hand, when the interval between adjacent protrusions becomes wider, the Death size becomes larger. Therefore, a large Death size means that the density of protrusions is small. For example, when the birth size is ⁇ 300 nm and the death size is 500 nm, this means that a different protrusion exists at a position about 1000 nm away from a protrusion having a diameter of 600 nm.
  • FIG. 3 is a zero-order persistence diagram of a protrusion of a steel sheet for cans.
  • FIG. 4 is a histogram of Death size, which is a histogram created for Death (Death size) shown in FIG. In Fig. 4, the numerical values at the top indicate the frequency. Fig. 4 shows the frequency per unit area for each of the death sizes of 0 nm or more and less than 750 nm, and the death size of 750 nm or more.
  • the minimum value of the birth size of the protrusions is ⁇ 500 nm or more, and it is preferably ⁇ 450 nm or more because paint adhesion is superior. More preferably, it is 400 nm or more.
  • the upper limit is not particularly limited, and may be, for example, ⁇ 1 nm or less, ⁇ 3 nm or less, or ⁇ 5 nm or less.
  • the number (number density) of protrusions having a death size of 0 nm or more and less than 750 nm is 1.0 piece/ ⁇ m2 or more , and 2.0 pieces/ ⁇ m2 is preferred because the paint adhesion is superior. More preferably, the number is 3.0/ ⁇ m2 or more.
  • the number (number density) of protrusions having a death size of 0 nm or more and less than 750 nm is 10.0 pieces/ ⁇ m2 or less, and from the viewpoint of better paint adhesion, 9.0 pieces/ ⁇ m2 or less is preferable, and 8.0 pieces/ ⁇ m2 or less is even more preferable.
  • protrusions When protrusions are uniformly and densely present over the entire surface of a steel sheet, they impair the surface appearance of the steel sheet for cans, for example, because the protrusions absorb light on the short wavelength side (blue), and the reflected light is attenuated, resulting in a reddish-brown color; the protrusions scatter light, reducing the overall reflectance and making the color darker; etc. In contrast, by having a mixture of areas with many protrusions and areas with few protrusions, light scattering is suppressed and good color tones can be obtained.
  • the number (number density) of protrusions having a death size of 750 nm or more is 0.02 pieces/ ⁇ m 2 or more, and preferably 0.04 pieces/ ⁇ m 2 or more.
  • the upper limit is not particularly limited.
  • the number (number density) of protrusions having a death size of 750 nm or more is, for example, 0.40 pieces/ ⁇ m 2 or less, may be 0.30 pieces/ ⁇ m 2 or less, or may be 0.20 pieces/ ⁇ m 2 or less.
  • the chromium hydrate oxide is precipitated on the surface of the steel sheet simultaneously with metallic chromium, and improves the corrosion resistance.
  • the chromium hydrate oxide includes, for example, chromium oxide and chromium hydroxide.
  • the coating amount of the chromium hydrate oxide layer in terms of chromium is 3 mg/m 2 or more, and preferably 4 mg/m 2 or more.
  • chromium hydrate oxide has a lower electrical conductivity than metallic chromium, and if the amount is too large, it will cause excessive resistance during welding, which may lead to the generation of dust and splashes and various welding defects such as blowholes due to overfusion welding, and may result in poor weldability of the steel sheet for cans.
  • the coating amount of the chromium hydrate oxide layer in terms of chromium is 50 mg/m2 or less , preferably 40 mg/m2 or less , and more preferably 30 mg/m2 or less .
  • the method for measuring the amount of chromium-equivalent adhesion of the chromium hydrate oxide layer is as described above.
  • a steel sheet is subjected to cathodic electrolysis C1 using an aqueous solution 1 containing a hexavalent chromium compound, a fluorine-containing compound and sulfuric acid, then subjected to an immersion treatment using an aqueous solution 2 containing a low concentration of sulfuric acid, and thereafter subjected to cathodic electrolysis C2 again using the aqueous solution 1.
  • the cathodic electrolytic treatment C1 flat plate-like metallic chromium is deposited on the surface of the steel sheet. Thereafter, an immersion treatment is carried out (i.e., the steel sheet on which the flat metallic chromium is formed is immersed in an aqueous solution 2 containing sulfuric acid), thereby partially activating the flat metallic chromium. At this time, since the concentration of sulfuric acid in the aqueous solution 2 is low, differences in the activation state occur depending on the crystal orientation of the steel sheet. Next, when performing the cathodic electrolytic treatment C2, protrusions are formed starting from the activated portions of the flat metal chromium. However, since the activation state differs depending on the crystal orientation of the steel sheet, the distribution of the protrusions becomes non-uniform.
  • the aqueous solution 1 used in the cathodic electrolysis contains a hexavalent chromium compound, a fluorine-containing compound, and sulfuric acid.
  • the fluorine-containing compound and sulfuric acid are present in a dissociated state (i.e., in the form of fluoride ions, sulfate ions, and hydrogen sulfate ions), which act as catalysts participating in the reduction reaction of hexavalent chromium ions present in the aqueous solution 1, which proceeds in the cathodic electrolysis treatment.
  • the aqueous solution 1 used in the cathodic electrolysis contains a fluorine-containing compound and sulfuric acid, so that the amount of chromium-equivalent deposition of the chromium hydrated oxide layer of the resulting steel sheet for cans can be reduced. Although the reason for this is not clear, it is believed that the amount of chromium hydrated oxide produced decreases as the amount of anions increases during the electrolysis.
  • hexavalent chromium compounds examples include chromium trioxide (CrO 3 ); dichromates such as potassium dichromate (K 2 Cr 2 O 7 ); and chromates such as potassium chromate (K 2 CrO 4 ).
  • the content of the hexavalent chromium compound in the aqueous solution 1 is preferably 0.14 mol/L or more, and more preferably 0.30 mol/L or more, in terms of the Cr amount.
  • the content of the hexavalent chromium compound in the aqueous solution 1 is preferably 3.00 mol/L or less, and more preferably 2.50 mol/L or less, in terms of the Cr amount.
  • Fluorine-containing compounds examples include hydrofluoric acid (HF), potassium fluoride (KF), sodium fluoride (NaF), hydrofluorosilicic acid (H 2 SiF 6 ), and salts of hydrofluorosilicic acid.
  • Examples of the salt of hydrosilicofluoric acid include sodium silicofluoride (Na 2 SiF 6 ), potassium silicofluoride (K 2 SiF 6 ), and ammonium silicofluoride ((NH 4 ) 2 SiF 6 ).
  • the content of the fluorine-containing compound in the aqueous solution 1 is preferably 0.02 mol/L or more, and more preferably 0.08 mol/L or more, in terms of the amount of F.
  • the content of the fluorine-containing compound in the aqueous solution 1 is preferably 0.48 mol/L or less, and more preferably 0.40 mol/L or less, in terms of the F amount.
  • Sulfuric acid A part or all of the sulfuric acid (H 2 SO 4 ) may be a sulfate salt such as sodium sulfate, calcium sulfate, or ammonium sulfate.
  • the content of sulfuric acid in the aqueous solution 1, in terms of the amount of SO 4 2- is preferably 0.0001 mol/L or more, more preferably 0.0003 mol/L or more, and even more preferably 0.0010 mol/L or more.
  • the content of sulfuric acid in the aqueous solution 1, in terms of the amount of SO 4 2- is preferably 0.1000 mol/L or less, and more preferably 0.0500 mol/L or less.
  • the liquid temperature of the aqueous solution 1 is preferably 20° C. or higher, and more preferably 40° C. or higher. On the other hand, the liquid temperature of the aqueous solution 1 is preferably 80° C. or lower, and more preferably 60° C. or lower.
  • the cathodic electrolysis C1 deposits plate-like metallic chromium and hydrated chromium oxide. If the current density of the cathodic electrolysis C1 is too low, the efficiency of deposition of metallic chromium decreases, and the proportion of the chromium hydrous oxide layer tends to increase. For this reason, the current density of the cathodic electrolysis treatment C1 is preferably 10.0 A/dm2 or more , and more preferably 15.0 A/dm2 or more .
  • the current density of the cathodic electrolysis treatment C1 is, for example, 200.0 A/ dm2 or less, and preferably 150.0 A/dm2 or less .
  • the current flow time and the electrical charge density (the product of the current density and the current flow time) of the cathodic electrolytic treatment C1 are appropriately set in order to obtain a target deposition amount.
  • the aqueous solution 2 used in the immersion treatment is, for example, a mixture of water and sulfuric acid (H 2 SO 4 ). If the concentration of sulfuric acid in the aqueous solution 2 is too high, the activation of the plate-like metallic chromium described above tends to proceed excessively in all crystal orientations of the steel sheet, which may result in the subsequent cathodic electrolytic treatment C2 causing projections to precipitate uniformly and entirely in all crystal orientations, resulting in poor surface appearance. For this reason, the concentration of sulfuric acid in the aqueous solution 2 is less than 10% by volume, and preferably less than 8%.
  • the concentration of sulfuric acid in the aqueous solution 2 is preferably 1 vol. % or more, more preferably 2 vol. % or more, even more preferably 3 vol. % or more, and particularly preferably 4 vol. % or more.
  • the aqueous solution 2 substantially contains only sulfuric acid in water. In other words, it is preferable that no components other than sulfuric acid are added to the water when the aqueous solution 2 is prepared.
  • the aqueous solution 2 contains components other than sulfuric acid (for example, the above-mentioned hexavalent chromium compounds and fluorine-containing compounds)
  • the hexavalent chromium compounds and F also activate the steel sheet, so that in the subsequent cathodic electrolytic treatment C2, protrusions are precipitated uniformly and entirely, and the surface appearance is likely to be poor.
  • the content of the hexavalent chromium compound in the aqueous solution 2 is preferably 0.010 mol/L or less, more preferably 0.005 mol/L or less, and even more preferably 0.001 mol/L or less, in terms of the Cr amount.
  • the content of the fluorine-containing compound in the aqueous solution 2 is preferably 0.010 mol/L or less, more preferably 0.005 mol/L or less, and even more preferably 0.001 mol/L or less, in terms of the F amount.
  • the liquid temperature of the aqueous solution 2 is preferably 20° C. or higher, and more preferably 40° C. or higher. On the other hand, the liquid temperature of the aqueous solution 2 is preferably 80° C. or lower, and more preferably 60° C. or lower.
  • the immersion treatment the steel sheet that has been subjected to the cathodic electrolytic treatment C1 (the steel sheet on which the flat metallic chromium and chromium hydrate oxide are formed) is immersed in the aqueous solution 2.
  • the flat metallic chromium is partially activated as described above. If the time for which the steel sheet is immersed in the aqueous solution 2 (immersion time) is too short, activation may not proceed sufficiently and protrusions may not be easily formed. Therefore, the immersion time is 0.10 seconds or more, preferably 0.20 seconds or more, and more preferably 0.30 seconds or more.
  • the immersion time is 2.00 seconds or less, preferably 1.50 seconds or less, and more preferably 1.00 seconds or less.
  • ⁇ Cathode electrolysis treatment C2> In the cathodic electrolysis C2, protrusions of the metal chromium layer are formed. If the current density of the cathodic electrolysis treatment C2 is too low, the deposition efficiency of metallic chromium decreases and the proportion of the chromium hydrate oxide layer tends to increase. Therefore, the current density of the cathodic electrolysis treatment C2 is preferably 10.0 A/dm2 or more , more preferably 15.0 A/dm2 or more . On the other hand, if the current density of the cathodic electrolysis treatment C2 is too high, protrusions may precipitate suddenly, damaging the surface appearance.
  • the current density of the cathodic electrolysis treatment C2 is 200.0 A/ dm2 or less, and preferably 150.0 A/dm2 or less .
  • the electric charge density of the cathodic electrolysis C2 is 30.0 C/ dm2 or less, preferably 25.0 C/dm2 or less , and more preferably 20.0 C/dm2 or less .
  • the lower limit is not particularly limited, and is, for example, 1.0 C/ dm2 , and preferably 3.0 C/ dm2 .
  • the energization time of the cathodic electrolysis treatment C2 is appropriately set based on the current density and the charge density.
  • Comparative Example 1 only the cathodic electrolysis treatment C1 was carried out using the aqueous solution 1. For this reason, "-" is entered in the columns for the aqueous solution 2 and the cathodic electrolysis treatment C2.
  • Comparative Example 7 the immersion treatment was carried out using Aqueous Solution 1 instead of Aqueous Solution 2.
  • Aqueous solution 1 was prepared by adding chromium trioxide (CrO 3 ), sodium silicofluoride (Na 2 SiF 6 ), and sulfuric acid (H 2 SO 4 ) to water.
  • Aqueous solution 2 was prepared by adding only sulfuric acid (H 2 SO 4 ) to water.
  • the aqueous solution was circulated through a flow cell by a pump at the equivalent of 100 mpm.
  • Lead electrodes were used for the cathodic electrolysis.
  • a steel sheet for cans was produced. After production, the steel sheet for cans was washed with water and dried at room temperature using a blower.
  • the adhesion weight of the metallic chromium layer and the adhesion weight in terms of chromium of the hydrated chromium oxide layer were measured.
  • a zero-order persistence diagram was created for the protrusions of the metal chromium layer of the produced steel sheet for cans, and the minimum birth size, the number density of protrusions having a death size of 0 nm or more and less than 750 nm, and the number density of protrusions having a death size of 750 nm or more were measured.
  • the measurement methods are as described above. The results are shown in Table 1 below.
  • the steel sheets for cans of Examples 1 to 23 were excellent in both paint adhesion and surface appearance.
  • the steel sheet for cans of Comparative Example 3 (immersion time of immersion treatment: 0.05 seconds), in which the number of protrusions having a death size of 0 nm or more and less than 750 nm was 0.5 pieces/ ⁇ m 2 , had insufficient paint adhesion.
  • the steel sheet for cans of Comparative Example 4 (immersion time of immersion treatment: 2.10 seconds), in which the number of protrusions having a death size of 0 nm or more and less than 750 nm was 11.0 pieces/ ⁇ m 2 , had insufficient paint adhesion.
  • the steel sheet for cans of Comparative Example 5 (the concentration of sulfuric acid in the aqueous solution 2 was 11% by volume), in which the number of protrusions having a death size of 750 nm or more was 0.01/ ⁇ m 2 , had an insufficient surface appearance.
  • the steel sheet for cans of Comparative Example 6 (current density of cathodic electrolytic treatment C2: 220.0 A/dm 2 ) in which the number of protrusions having a death size of 750 nm or more was 0.01/ ⁇ m 2 , had insufficient surface appearance.
  • the steel sheet for cans of Comparative Example 7 (using Aqueous Solution 1 for the immersion treatment), in which the number of protrusions having a death size of 750 nm or more was 0.01 pieces/ ⁇ m 2 , had an insufficient surface appearance.

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  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Chemical Kinetics & Catalysis (AREA)
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Abstract

La présente invention concerne une tôle d'acier (1) destinée à des boîtes de conserve, la tôle d'acier étant excellente en termes d'adhérence de revêtement et d'aspect de surface. La tôle d'acier (1) destinée à des boîtes de conserve comprend, sur la surface d'une tôle d'acier (2), une couche métallique de chrome (3) et une couche d'oxyde de chrome hydraté (4) séquentiellement à partir du côté tôle d'acier (2). Le degré d'adhérence de la couche métallique de chrome (3) est de 50 à 200 mg/m2, et le degré d'adhérence de la couche d'oxyde de chrome hydraté (4) en termes de chrome est de 3 à 50 mg/m2. La couche métallique de chrome (3) comprend une partie plaque plate (3a) et des saillies (3b) qui sont disposées sur la partie plaque plate (3a). La valeur minimale de la taille de début des saillies (3b) est de -500 nm ou plus. Le nombre de saillies présentant une taille de fin non inférieure à 0 nm mais inférieure à 750 nm est de 1,0 à 10,0 saillies/μm2, et le nombre de saillies présentant une taille de fin de 750 nm ou plus est de 0,02 saillie/μm2 ou plus. La taille de début et la taille de fin des saillies sont déterminées par la création d'un diagramme de persistance d'ordre zéro par rapport aux saillies.
PCT/JP2024/007285 2023-06-12 2024-02-28 Tôle d'acier destinée à des boîtes de conserve Pending WO2024257414A1 (fr)

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CN202480035624.9A CN121263559A (zh) 2023-06-12 2024-02-28 罐用钢板
JP2024534484A JP7563659B1 (ja) 2023-06-12 2024-02-28 缶用鋼板
KR1020257037725A KR20260002883A (ko) 2023-06-12 2024-02-28 캔용 강판

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Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5616696A (en) * 1979-07-17 1981-02-17 Nippon Steel Corp Preparation of electrolytic chromic acid treated steel sheet having high adhesive strength
JPH0225593A (ja) * 1988-07-14 1990-01-29 Kawasaki Steel Corp 均一なクロム酸化膜を有するティンフリー鋼板の製造方法
JP2022092815A (ja) * 2020-12-11 2022-06-23 Ｊｆｅスチール株式会社 缶用鋼板およびその製造方法
JP7239087B1 (ja) * 2021-12-28 2023-03-14 Ｊｆｅスチール株式会社 缶用鋼板およびその製造方法

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5616696A (en) * 1979-07-17 1981-02-17 Nippon Steel Corp Preparation of electrolytic chromic acid treated steel sheet having high adhesive strength
JPH0225593A (ja) * 1988-07-14 1990-01-29 Kawasaki Steel Corp 均一なクロム酸化膜を有するティンフリー鋼板の製造方法
JP2022092815A (ja) * 2020-12-11 2022-06-23 Ｊｆｅスチール株式会社 缶用鋼板およびその製造方法
JP7239087B1 (ja) * 2021-12-28 2023-03-14 Ｊｆｅスチール株式会社 缶用鋼板およびその製造方法

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