Plated checkered steel sheet

Abstract

This plated checkered steel plate is provided with: a base checkered steel plate in which a convex section and a flat section having a height of 3 mm or less are provided on one plate surface; a plating layer including a zinc-based alloy layer and disposed on the plate surface of the base riffled plate on which the convex portion and the flat portion are provided; and a chemical conversion coating layer provided on the surface of the plating layer, the film thickness of the chemical conversion coating layer at the flat portion of the base checkered steel plate being 0.10-5.00 [mu] m per surface, and the thickness of the chemical conversion coating layer at the flat portion of the base checkered steel plate being 0.10-5.00 [mu] m per surface. The ratio of the film thickness of the chemically-converted film layer in the flat portion to the film thickness of the chemically-converted film layer in the convex portion of the base checkered steel plate (the film thickness of the chemically-converted film layer in the flat portion / the film thickness of the chemically-converted film layer in the convex portion) is 0.2-5.0.

Description

Technical Field

[0001] The present disclosure relates to a plated patterned steel plate. Background Art

[0002] Patterned steel plates are steel plates with continuous anti-skid convexities (i.e., protrusions) on the surface through rolling. Generally speaking, convexities of a certain width, a certain length, and a certain height are set at a certain angle and a certain spacing relative to the rolling direction. Usually, patterned steel plates are manufactured by hot rolling. In addition, patterned steel plates are used for floors or pedals of large vehicles (buses, trucks, etc.), pads for multi-story parking lots, pads for factories, decks of ships, temporary scaffolding or stairs at construction sites, etc.

[0003] For example, Patent Document 1 discloses: "A coating method, characterized in that it is a method for coating the cosmetic surface of a substrate using a roller coater, wherein the cosmetic surface of the substrate is made into a concave-convex surface having a concave-convex pattern, and at least the surface of the coating roller of the roller coater is made into an elastic surface, the coating roller and the substrate are rotated at approximately the same speed, and the coating roller is brought into contact with the concave-convex surface with a pressing force."

[0004] Prior art literature

[0005] Patent Literature

[0006] Patent Document 1: Japanese Patent Application Laid-Open No. 2-17972 Summary of the invention

[0007] Problems to be solved by the invention

[0008] The patterned steel plate forms a chemical conversion coating layer for the purpose of suppressing poor primary rust prevention. Unlike ordinary flat steel plates, the patterned steel plate has convex parts and flat parts, so the thickness of the chemical conversion coating layer may be uneven at the convex parts and flat parts, resulting in poor primary rust prevention.

[0009] Therefore, an object of the present disclosure is to provide a plated patterned steel sheet in which primary rust prevention failure is suppressed.

[0010] Means for solving problems

[0011] Means for solving the above-mentioned problems include the following.

[0012] <1> A plated patterned steel plate having:

[0013] A base patterned steel plate having a convex portion and a flat portion with a height of less than 3.0 mm on one plate surface;

[0014] a plating layer including a zinc alloy layer disposed on the plate surface of the base patterned steel plate having the convex portion and the flat portion; and

[0015] A chemical conversion treatment film layer provided on the surface of the above-mentioned plated layer,

[0016] The film thickness of the chemical conversion treatment film layer at the flat portion of the base pattern steel plate is 0.10 to 5.00 μm per single surface.

[0017] The film thickness ratio of the chemical conversion coating layer between the flat portion and the convex portion of the base patterned steel plate (film thickness of the chemical conversion coating layer on the flat portion / film thickness of the chemical conversion coating layer on the convex portion) is 0.2 to 5.0.

[0018] <2> according to <1> The plated patterned steel plate, wherein the film thickness ratio of the chemical conversion treatment film layer between the flat portion and the convex portion of the base patterned steel plate is 0.4 to 1.5.

[0019] <3> according to <1> or <2> The plated patterned steel sheet, wherein the film thickness ratio of the chemical conversion treatment film layer of the flat portion and the convex portion of the base patterned steel sheet is 0.2 or more and less than 0.8 or 1.5 to 5.0.

[0020] Effects of the Invention

[0021] According to the present disclosure, it is possible to provide a plated pattern steel sheet in which primary rust prevention failure is suppressed. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1A 1 is a schematic plan view showing an example of a base patterned steel sheet of the plated patterned steel sheet disclosed in the present invention.

[0023] Figure 1B is a schematic cross-sectional view showing an example of a base patterned steel plate of the plated patterned steel plate disclosed in the present invention, Figure 1A Schematic diagram of the GG cross section.

[0024] Figure 1C is a schematic cross-sectional view showing an example of a base patterned steel plate of the plated patterned steel plate disclosed in the present invention, Figure 1A Schematic diagram of the FF cross section.

[0025] Figure 2 This is a schematic diagram showing an example of a coating device used in the method for producing a plated patterned steel sheet of the present disclosure.

[0026] Figure 3 This is a schematic diagram showing an example of a grooved coating roller used in the method for producing a plated patterned steel sheet of the present disclosure. DETAILED DESCRIPTION

[0027] Hereinafter, an example of the present disclosure will be described.

[0028] It should be noted that in the present disclosure, the “%” expression of the content of each element in the chemical composition means “mass %”.

[0029] The numerical range expressed using "to" means a range including the numerical values ​​described before and after "to" as the lower limit and the upper limit.

[0030] When “exceeds” or “is lower than” is indicated with respect to the numerical values ​​described before and after “to”, the numerical range means a range not including these numerical values ​​as the lower limit or the upper limit.

[0031] The content of elements in a chemical composition may be described as element concentration (for example, Zn concentration, Mg concentration, etc.).

[0032] The plated patterned steel sheet disclosed in the present invention comprises: a base patterned steel sheet having protrusions and flat portions on one plate surface; a plating layer including a zinc alloy layer arranged on the plate surface having protrusions and flat portions of the base patterned steel sheet; and a chemical conversion treatment film layer provided on the surface of the plating layer.

[0033] The film thickness of the chemical conversion treatment film layer at the flat portion of the base pattern steel plate is 0.10 to 5.00 μm per single surface.

[0034] The film thickness ratio of the chemical conversion coating layer in the flat portion and the convex portion of the base pattern steel plate (film thickness of the chemical conversion coating layer in the flat portion / film thickness of the chemical conversion coating layer in the convex portion) is 0.20 to 5.00.

[0035] The plated pattern steel sheet of the present disclosure is a plated pattern steel sheet in which primary rust prevention failure is suppressed by the above-mentioned configuration.

[0036] Hereinafter, the plated pattern steel sheet of the present disclosure will be described in detail.

[0037] (Base pattern steel plate)

[0038] The base pattern steel plate is a steel plate to be plated. The base pattern steel plate has convex portions and flat portions on one plate surface.

[0039] The height of the convex portion of the base pattern steel plate (i.e., the pattern height) is 3.0 mm or less. If the height difference with the flat portion becomes larger, the pressing force on the base pattern steel plate in the grooved coating roller for forming the chemical conversion treatment film layer becomes unstable. As a result, a portion where the chemical conversion treatment liquid is insufficient is generated, and the film thickness ratio of the chemical conversion treatment film layer of the convex portion to the flat portion becomes larger, which is easy to generate white rust, resulting in poor primary rust prevention. Therefore, the height of the convex portion of the base pattern steel plate is set to the above range.

[0040] The height of the convex portion of the base pattern steel plate is preferably 2.5 mm or less. However, from the viewpoint of anti-slip properties as a floor, the lower limit of the height of the convex portion of the base pattern steel plate is set to, for example, 0.5 mm or more.

[0041] The height of the convex portion of the base pattern steel plate is the height of the central portion in the length direction and the central portion in the width direction of the convex portion (refer to Figure 1B and Figure 1C H in.

[0042] Other shapes of base patterned steel plates are as follows Figure 1A to Figure 1C It should be noted that in FIG1 , A, B, C, D, and E are as follows.

[0043] A: Arrangement angle of the convex portion (angle of the longitudinal direction of the convex portion relative to the rolling direction) = 35 to 55° (preferably 40 to 50°)

[0044] B: Length of the convex portion = 15 to 50 mm (preferably 20 to 40 mm).

[0045] C: Maximum width of the convex portion = 3 to 8 mm (preferably 4 to 7 mm).

[0046] D: Minimum width of convex portion = 0.5 to 6 mm (preferably 1 to 4 mm).

[0047] E: The arrangement pitch of the convex portions (the distance between the longitudinal center and the width center of the convex portions along the rolling direction) = 15 to 50 mm (preferably 20 to 40 mm).

[0048] Area occupancy of convex portion = 10 to 70% (preferably 15 to 60%)

[0049] The base pattern steel plate is generally provided with the shape of the convex portion by hot rolling. The steel type of the base pattern steel plate is not particularly limited. For example, the base pattern steel plate may be a steel type corresponding to a general structural rolled steel material specified in JIS G3101:2015.

[0050] The convex shape of the base pattern steel plate is imparted by, for example, transferring the concave shape formed on the work rolls to the steel plate surface during the finishing step of hot rolling.

[0051] It should be noted that the opposite plate surface facing the plate surface provided with the convex portion and the flat portion in the plate thickness direction is a surface having the surface properties of a normal steel plate. Specifically, the opposite plate surface facing the plate surface provided with the convex portion and the flat portion in the plate thickness direction is, for example, a plate surface provided by a normal rolling roll (i.e., a roll having a normal roughness) facing the work roll provided with the convex portion and the flat portion in the stage of finish hot rolling.

[0052] The base pattern steel plate may also be a pre-plated pre-plated pattern steel plate. The pre-plated pattern steel plate is obtained, for example, by an electrolytic treatment method or a displacement plating method. In the electrolytic treatment method, the base pattern steel plate is immersed in a sulfuric acid bath or a chloride bath containing metal ions of various pre-plating components to perform electrolytic treatment, thereby obtaining a pre-plated pattern steel plate. In the displacement plating method, the base pattern steel plate is immersed in an aqueous solution containing metal ions of various pre-plating components and pH-adjusted with sulfuric acid to cause metal displacement precipitation, thereby obtaining a pre-plated pattern steel plate.

[0053] As a pre-plated pattern steel sheet, a Ni pre-plated pattern steel sheet can be cited as a representative example.

[0054] (Plating)

[0055] The plating layer includes a zinc alloy layer.

[0056] The coating weight is preferably 60 to 500 g / m2 per side. 2 .

[0057] If the coating weight is set to 60g / m 2 On the other hand, if the coating weight is set to 500 g / m 2 Below, it is possible to suppress the appearance defects such as sagging patterns of the plating layer. Therefore, the adhesion amount of the zinc-based plating layer is set to the above range.

[0058] From the viewpoint of improving corrosion resistance, the coating weight is more preferably 90 to 460 g / m 2 , more preferably 100 to 400 g / m 2 .

[0059] The coating weight of the plating layer was measured as follows.

[0060] A 50mm×50mm sample is cut out from the plated patterned steel plate to be measured, and the opposite side of the plate surface opposite to the plate surface with convex and flat parts in the plate thickness direction is sealed with tape. After that, the sample is immersed in hydrochloric acid to which an inhibitor for inhibiting the dissolution of iron is added to dissolve the coating on the plate surface with convex and flat parts. The weight difference before and after dissolution is divided by the area of ​​the sample (50mm×50mm) to calculate the adhesion amount of the coating. This is carried out 3 times and the average value is taken.

[0061] The zinc alloy layer is an alloy layer containing zinc and aluminum. In addition, it may also contain one or more elements selected from magnesium and silicon. Specifically, as the zinc alloy layer, well-known zinc alloy layers such as zinc-aluminum alloy layer, zinc-aluminum-magnesium alloy layer, zinc-aluminum-magnesium-silicon alloy layer, and zinc-aluminum-silicon alloy layer can be listed.

[0062] The zinc alloy layer may be a plating layer containing a small amount of cobalt, molybdenum, tungsten, nickel, titanium, calcium, chromium, manganese, iron, lead, bismuth, antimony, tin, copper, cadmium, arsenic, etc. as an added element or impurity.

[0063] In particular, from the viewpoint of corrosion resistance, the zinc-based alloy layer is preferably an alloy layer containing zinc, aluminum, and magnesium.

[0064] The plating layer may include an Al-Fe alloy layer in addition to the zinc alloy layer. The Al-Fe alloy layer is disposed between the base pattern steel plate and the zinc alloy layer.

[0065] That is, the plating layer may be a single layer structure of a zinc alloy layer or a laminated structure including a zinc alloy layer and an Al—Fe alloy layer. In the case of a laminated structure, the zinc alloy layer is a layer constituting the surface of the plating layer.

[0066] However, an oxide film of the plating layer constituent element is formed on the surface of the plating layer with a thickness of about 50 nm, but the thickness is thin relative to the thickness of the entire plating layer and is considered not to constitute the main body of the plating layer.

[0067] The Al-Fe alloy layer may be formed on the surface of the base patterned steel plate (specifically, between the base patterned steel plate and the zinc-based coating), and is a layer in which the Al5Fe phase is the main phase in terms of the structure. The Al-Fe alloy layer is formed by mutual atomic diffusion between the base patterned steel plate and the coating bath. Since the coating layer of the patterned steel plate disclosed in the present invention is formed by hot-dip coating, an Al-Fe alloy layer is easily formed in the coating layer containing the Al element. Since the coating bath contains Al at a certain concentration or more, the Al5Fe phase is formed most frequently. However, atomic diffusion takes time, and there are also portions where the Fe concentration is high near the base patterned steel plate. Therefore, the Al-Fe alloy layer may also partially contain a small amount of AlFe phase, Al3Fe phase, Al5Fe2 phase, etc. In addition, since a certain concentration of Zn is also contained in the coating bath, a small amount of Zn is also contained in the Al-Fe alloy layer.

[0068] Here, when Si is contained in the coating, Si is particularly easy to be taken into the Al-Fe alloy layer, and it is possible to become an Al-Fe-Si intermetallic compound phase. As the identified intermetallic compound phase, there is an AlFeSi phase, and as isomers, there are α, β, q1, q2-AlFeSi phases. Therefore, it is possible to detect these AlFeSi phases in the Al-Fe alloy layer. The Al-Fe alloy layer containing these AlFeSi phases is also referred to as an Al-Fe-Si alloy layer. It should be noted that the Al-Fe-Si alloy layer is also smaller in thickness than the coating, so the impact on the corrosion resistance of the entire coating is small.

[0069] In addition, when various pre-plated patterned steel sheets are used in the base patterned steel sheet, the structure of the Al-Fe alloy layer may change depending on the amount of pre-plated layer attached. Specifically, there are the following situations: a pure metal layer used in pre-plating remains around the Al-Fe alloy layer; an intermetallic compound phase (for example, Al3Ni phase, etc., in the case of using a pre-plated Ni patterned steel sheet) formed by the constituent components of the plating layer combined with the pre-plating components forms an alloy layer; an Al-Fe alloy layer in which a part of Al atoms and Fe atoms are replaced; or an Al-Fe-Si alloy layer in which a part of Al atoms, Fe atoms and Si atoms are replaced, etc. In any case, these alloy layers have a small impact on the corrosion resistance of the entire plating layer because their thickness is smaller than that of the Zn-Al-Mg alloy layer.

[0070] For example, the plating layer preferably has the following chemical composition: containing, in mass %, the following:

[0071] Al: more than 0.1% and less than 25.0%,

[0072] Mg: 0% or more and less than 12.5%,

[0073] Sn: 0% to 5.0%,

[0074] Bi: 0% or more and less than 5.0%, In: 0% or more and less than 2.0%, Ca: 0% to 3.00%, Y: 0% to 0.5%, La: 0% or more and less than 0.5%, Ce: 0% or more and less than 0.5%, Si: 0% or more and less than 2.5%, Cr: 0% or more and less than 0.25%, Ti: 0% or more and less than 0.25%, Zr: 0% or more and less than 0.25%, Mo: 0% or more and less than 0.25%, W: 0% or more and less than 0.25%, Ag: 0% or more and less than 0.25%, P: 0% or more and less than 0.25%, Ni: 0% or more and less than 0.25%, Co: 0% or more and less than 0.25%, V: 0% or more and less than 0.25%, Nb: 0% or more and less than 0.25%, Cu: 0% or more and less than 0.25%, Mn: 0% or more and less than 0.25%, Li: 0% or more and less than 0.25%, Na: 0% or more and less than 0.25%, K: 0% or more and less than 0.25%, Fe: 0% to 5.0%, Sr: 0% or more and less than 0.5%, Sb: 0% or more and less than 0.5%, Pb: 0% or more and less than 0.5%, B: 0% or more and less than 0.5%, and

[0075] The remainder: Zn and impurities.

[0076] When the chemical composition is set as described above, the corrosion resistance is improved.

[0077] In the chemical composition of the plating layer, Mg, Sn, Bi, In, Ca, Y, La, Ce, Si, Cr, Ti, Zr, Mo, W, Ag, P, Ni, Co, V, Nb, Cu, Mn, Li, Na, K, Fe, Sr, Sb, Pb and B are optional components. That is, these elements may not be contained in the plating layer.

[0078] Among them, the chemical composition of the coating is the average chemical composition of the entire coating (when the coating is a single-layer structure of a zinc-based alloy layer, it is the average chemical composition of the zinc-based alloy layer; when the coating is a stacked structure of a zinc-based alloy layer and an Al-Fe alloy layer, it is the total average chemical composition of the zinc-based alloy layer and the Al-Fe alloy layer).

[0079] Generally, in the hot-dip plating method, the chemical composition of the zinc alloy layer becomes substantially the same as the chemical composition of the plating bath because the formation reaction of the plating layer is basically completed in the plating bath. In addition, in the hot-dip plating method, the Al-Fe alloy layer is formed and grows instantly just after immersion in the plating bath. Moreover, the Al-Fe alloy layer completes the formation reaction in the plating bath, and its thickness is also sufficiently smaller than that of the zinc alloy layer in most cases.

[0080] Therefore, after plating, unless special heat treatment such as heat alloying treatment is performed, the average chemical composition of the entire plating layer is substantially equal to the chemical composition of the zinc-based alloy layer, and the components of the Al—Fe alloy layer can be ignored.

[0081] The chemical composition of the coating was determined by the following method.

[0082] First, the coating is stripped and dissolved with an acid containing an inhibitor that inhibits corrosion of the base patterned steel plate to obtain an acid solution. Next, the obtained acid solution is measured by ICP analysis to obtain the chemical composition of the coating (when the coating is a single-layer structure of a zinc alloy layer, it is the chemical composition of the zinc alloy layer; when the coating is a laminated structure of an Al-Fe alloy layer and a zinc alloy layer, it is the combined chemical composition of the Al-Fe alloy layer and the zinc alloy layer). There is no particular limitation on the acid species as long as it can dissolve the coating. It should be noted that the chemical composition is measured as an average chemical composition. It should be noted that through ICP analysis, the Zn concentration is calculated by "Formula: Zn concentration = 100% - other element concentrations (%)".

[0083] Here, when a pre-plated pattern steel sheet is used as the base pattern steel sheet, the components of the pre-plated layer are also detected.

[0084] For example, in the case of a pre-plated Ni patterned steel sheet, in the ICP analysis, not only Ni in the plating layer but also Ni in the pre-plated Ni layer is detected. 2 ~3g / m 2 When the pre-plated checkered steel plate is used as the base checkered steel plate, even if the Ni concentration contained in the plating layer is 0%, the Ni concentration is detected at 0.1 to 15%. On the other hand, when the pre-plated Ni checkered steel plate is used as the base checkered steel plate, when the base checkered steel plate is immersed in the plating bath, the Ni in the Ni pre-plating layer is slightly dissolved in the plating bath. Therefore, the Ni concentration in the plating bath is 0.02 to 0.03% higher than the Ni concentration in the plating bath of the built bath. Therefore, when the pre-plated Ni checkered steel plate is used, the Ni concentration in the plating layer is increased by a maximum of 0.03%.

[0085] Here, the method of judging whether the base pattern steel plate is a pre-plated pattern steel plate is as follows.

[0086] From the plated pattern steel sheet to be measured, a sample is collected, with the cross section cut along the plate thickness direction of the plated pattern steel sheet serving as a measurement surface.

[0087] For the measurement surface of the sample, the Ni concentration is measured by line analysis near the interface between the coating layer and the base pattern steel plate in the plated pattern steel plate using an electron beam microanalyzer (Electron Probe MicroAnalyser: FE-EPMA). The measurement conditions are: acceleration voltage of 15 kV, beam diameter of about 100 nm, irradiation time per point of 1000 ms, and measurement interval of 60 nm. It should be noted that the measurement distance can be any distance that can confirm whether the Ni concentration is concentrated at the interface between the coating layer and the base pattern steel plate in the plated pattern steel plate.

[0088] Then, if the Ni concentration is concentrated at the interface between the plated layer in the plated patterned steel sheet and the base patterned steel sheet, the base patterned steel sheet is judged to be a pre-plated patterned steel sheet.

[0089] In addition, when a Ni-pre-plated pattern steel sheet is used as the base pattern steel sheet, the Ni concentration of the plating layer is defined as a value measured as follows.

[0090] First, the luminescence intensity of Ni was measured for three or more standard samples with different Ni concentrations (BAS Zn alloy standard samples IMN ZH1, ZH2, and ZH4) using a high-frequency glow discharge luminescence surface analyzer (GDS: manufactured by Horiba, Ltd., model: GD-Profiler2). A standard line was prepared based on the relationship between the obtained Ni luminescence intensity and the Ni concentration of the standard sample.

[0091] Next, the luminescence intensity of Ni at the 1 / 2 position of the film thickness of the plated patterned steel plate of the measured object (the opposite side plate surface opposite to the plate surface with the convex part and the flat part in the plate thickness direction) was measured using a high-frequency glow discharge luminescence surface analyzer (GDS: manufactured by Horiba, Ltd., model: GD-Profiler2). The Ni concentration at the 1 / 2 position of the plated layer was calculated from the obtained Ni luminescence intensity and the prepared standard line. The obtained Ni concentration at the 1 / 2 position of the plated layer was defined as the Ni concentration of the plated layer.

[0092] When a Ni-pre-plated pattern steel sheet is used as the base pattern steel sheet, the Zn concentration of the plating layer is defined as the Zn concentration calculated by the following formula.

[0093] Formula: Zn concentration = 100 - (concentration of elements other than Zn and Ni obtained by ICP analysis + Ni concentration obtained by GDS)

[0094] It should be noted that the measurement conditions of the high-frequency glow discharge light emission surface analysis device were set as follows.

[0095] HV: 630V

[0096] Anode diameter: φ4mm

[0097] Gas: Ar

[0098] Gas pressure: 600Pa

[0099] Output power: 35W

[0100] (Chemical conversion treatment film layer)

[0101] The film thickness of the chemical conversion treatment film layer at the flat portion of the base pattern steel plate is 0.10 to 5.00 μm per single surface.

[0102] If the film thickness of the chemical conversion film layer at the flat portion is thin, white rust is generated locally, and the primary rust prevention becomes poor. If the film thickness of the chemical conversion film layer at the flat portion is thick, cracks are generated in the chemical conversion film layer, and the primary rust prevention becomes poor. Therefore, the film thickness of the chemical conversion film layer at the flat portion of the base pattern steel plate is set to the above range.

[0103] From the viewpoint of improving primary rust prevention, the film thickness of the chemical conversion treatment film layer at the flat portion of the base pattern steel plate is preferably 0.20 to 4.00 μm, more preferably 0.30 to 3.00 μm.

[0104] The film thickness of the chemical conversion film layer at the flat portion is the film thickness of the chemical conversion film layer at the flat portion 3 mm away from the convex portion ( Figure 1A (where F2 is the thickness of the chemical conversion treatment film layer at the position indicated by F2).

[0105] The film thickness ratio of the chemical conversion coating layer of the flat portion and the convex portion of the base pattern steel plate (film thickness of the chemical conversion coating layer of the flat portion / film thickness of the chemical conversion coating layer of the convex portion) is 0.2 to 5.0.

[0106] If the film thickness ratio of the chemical conversion coating layer in the flat portion to the convex portion is too low, the convex portion is thick and the flat portion is thin, so coating defects are easily generated in the flat portion, white rust is locally generated, and primary rust prevention becomes poor.

[0107] If the film thickness ratio of the chemical conversion film layer of the flat portion to the convex portion is too high, the film thickness of the chemical conversion film layer becomes uneven, white rust is generated locally, and primary rust prevention becomes poor. Therefore, the film thickness ratio of the chemical conversion film layer of the flat portion to the convex portion is set to the above range.

[0108] From the viewpoint of improving primary rust prevention, the film thickness ratio of the chemical conversion treatment film layer of the flat portion to that of the convex portion is preferably 0.3 to 4.0, more preferably 0.4 to 3.0.

[0109] Here, as the use purpose of the plated patterned steel plate disclosed in the present invention, it is advisable to control the film thickness of the chemical conversion treatment film layer formed on the convex part and the flat part. The chemical conversion treatment film layer is usually a transparent film layer of several μm, which is located on the surface of the metal layer that reflects light. Therefore, due to the refraction of light caused by the film thickness of the chemical conversion treatment film layer, interference colors may appear. Since the interference colors appear red, yellow, or green, they appear like patterns in various parts of the plated patterned steel plate, causing poor appearance.

[0110] In order to make the appearance of the patterned plated steel sheet as constant as possible, the thickness of the chemical conversion treatment film layer on the convex part and the flat part is made as equal as possible, thereby achieving a uniform appearance and eliminating the phenomenon of color spots and the like that appear to be patterned.

[0111] Therefore, from the viewpoint of suppressing the phenomenon of color spots appearing as patterned, the film thickness ratio of the chemical conversion coating layer of the flat portion to the convex portion is most preferably 1.0, more preferably 0.4 to 1.5, and even more preferably 0.8 to 1.1.

[0112] When the thickness ratio of the chemical conversion coating layer of the flat portion and the convex portion is set to the above-mentioned ratio, the hues are of the same color system.

[0113] On the other hand, the plated patterned steel sheet disclosed in the present invention may be arc welded with various components in addition to cutting and bending to be used for structures such as parking lot trays and stair treads. In particular, the thickness control of the chemical conversion treatment film layer affects arc welding.

[0114] Generally speaking, a plated checkered steel sheet requires a larger welding current than a hot-rolled checkered steel sheet without a plate, and therefore welding defects may occur.

[0115] In particular, if a chemical conversion treatment film layer is formed on the plated layer, the following inconvenience may occur.

[0116] (1) The current supply becomes unstable, and the weld bead formed during arc welding becomes unstable.

[0117] (2) Sputtering marks caused by large current become severe.

[0118] (3) Damage to the film layer during chemical conversion treatment causes the weld to expand beyond its necessary size.

[0119] (4) The gas obtained by vaporizing the film layer during chemical conversion treatment causes welding fume to become more intense.

[0120] (5) Foreign matter is generated in the weld.

[0121] In particular, the shape of the weld bead has a significant influence on the strength of a structure obtained by coating a patterned steel plate.

[0122] Therefore, the shape of the weld bead, specifically, the smoke gas generated during welding is preferably dispersed appropriately to prevent it from being taken into the weld bead. From this point of view, the plated pattern steel sheet has a larger current value than the hot-rolled steel sheet, making welding difficult. If the chemical conversion film layer is uniformly formed, it generally tends to be difficult to conduct electricity. On the other hand, when the film thickness ratio of the flat part to the convex part is large, there is a region where the chemical conversion film layer becomes thin. As a result, the arc is relatively stable and the shape of the weld bead is stable.

[0123] Therefore, when the film thickness ratio of the chemical conversion coating layer of the flat portion to the convex portion is 1.0, arc weldability is the least favorable. Therefore, from the viewpoint of stabilizing the shape of the weld bead during welding, the film thickness ratio of the chemical conversion coating layer of the flat portion to the convex portion is preferably less than 0.8 or 1.5 or more, and more preferably less than 0.6 or 1.9 or more.

[0124] That is, from the viewpoint of suppressing primary rust prevention failure and stabilizing the shape of the weld bead during welding, the film thickness ratio of the chemical conversion treatment film layer of the flat portion to the convex portion is preferably 0.2 or more and less than 0.8 or 1.5 to 5.0, and more preferably 0.2 or more and less than 0.6 or 1.9 to 5.0.

[0125] Here, the film thickness of the chemical conversion film layer at the convex portion is the film thickness of the chemical conversion film layer at the center of the longitudinal direction of the convex portion and the center of the width direction ( Figure 1A (wherein is the film thickness of the chemical conversion treatment film layer at the position indicated by F1).

[0126] Here, the film thickness of the chemical conversion treatment film layer is measured as follows.

[0127] For the plated patterned steel sheet to be measured, the sample is collected by cutting the plated patterned steel sheet in the center of the longitudinal direction of the convex portion and in the width direction of the convex portion and in the thickness direction. Specifically, Figure 1A In the process, the plated pattern steel sheet was cut at a position corresponding to the FF cross section to collect a sample.

[0128] Next, a gold film was vapor-deposited on the surface of the chemical conversion treatment film layer of the sample.

[0129] Next, the sample was embedded in epoxy resin and ground to the observation position.

[0130] Next, the cut cross section of the polished sample was observed at 10,000 times magnification using a scanning electron microscope (SEM).

[0131] Next, the film thickness of the chemical conversion coating layer at each position in the observed cross section was measured as follows: The film thickness of the chemical conversion coating layer at each position was the film thickness of the layer between the plated layer and the gold film.

[0132] (1) The film thickness of the chemical conversion coating layer at the center of the longitudinal direction and the center of the width direction of the convex part ( Figure 1A (wherein is the film thickness of the chemical conversion treatment film layer at the position indicated by F1).

[0133] (2) The thickness of the chemical conversion coating layer at the flat part 3 mm away from the convex part ( Figure 1A (where F2 is the thickness of the chemical conversion treatment film layer at the position indicated by F2).

[0134] Then, the above operation was performed three times, and the average value of the film thickness of the chemical conversion treatment film layer at each position was determined.

[0135] The components of the chemical conversion treatment film layer are not particularly limited, and known components can be used.

[0136] As the chemical conversion treatment film layer, for example, there can be listed well-known chemical conversion treatment film layers with silane coupling agents (organic silicon compounds), zirconium compounds, titanium compounds, phosphoric acid compounds, fluorine compounds, vanadium compounds, cobalt compounds, ammonium zirconium carbonate, acrylic resins, vanadium compounds, and phosphorus compounds as main components. It should be noted that the so-called main component means the component that is the largest in the layer.

[0137] However, from the viewpoint of suppressing environmental load, it is preferable that the chemical conversion coating layer be a chemical conversion coating layer other than a chromate chemical conversion coating layer.

[0138] From the viewpoint of suppressing primary rust prevention failure, as the chemical conversion treatment film layer, specifically, for example, the following film layers are preferred.

[0139] (1) a film layer comprising an organic silicon compound, at least one fluorine compound selected from titanium hydrofluoride or zirconium hydrofluoride, phosphoric acid and a vanadium compound, wherein the organic silicon compound is obtained by combining a silane coupling agent containing one amino group in the molecule and a silane coupling agent containing one glycidyl group in the molecule, and contains two or more groups of the formula -SiR 1 R 2 R(where R 1 , R 2 and R 3 A functional group (a) represented by an alkoxy group or a hydroxy group, at least one of which independently represents an alkoxy group, and at least one hydrophilic functional group (b) selected from the group consisting of a hydroxy group (different from another hydroxy group that may be contained in the functional group (a)) and an amino group.

[0140] (2) A film layer comprising an organic silicon compound, one or two of a zirconium compound and a titanium compound, a phosphoric acid compound, a fluorine compound and a vanadium compound.

[0141] (3) A film layer comprising acrylic resin, zirconium, vanadium, phosphorus and cobalt.

[0142] (4) A film layer comprising a zirconium carbonate compound, an acrylic resin, a divalent to tetravalent vanadium compound, a phosphorus compound and a cobalt compound (E), wherein the acrylic resin is obtained by copolymerizing a monomer component comprising at least styrene, (meth)acrylic acid, an alkyl (meth)acrylate and acrylonitrile.

[0143] (Method for manufacturing plated patterned steel sheet)

[0144] Hereinafter, an example of a method for producing a plated patterned steel sheet according to the present disclosure will be described.

[0145] The method for manufacturing a plated patterned steel sheet disclosed in the present invention described below as an example is particularly suitable for a process in which the following Figure 1A to Figure 1C A method for manufacturing a plated patterned steel plate having a base patterned steel plate having a shape in which the arrangement angle A of the protrusions, the length B of the protrusions, the maximum width C of the protrusions, the minimum width D of the protrusions, the arrangement spacing E of the protrusions, the height H of the protrusions, and the area occupancy of the protrusions are within the above-mentioned ranges.

[0146] The method for producing a plated patterned steel sheet disclosed in the present invention includes a plating layer forming step and a chemical conversion treatment film forming step.

[0147] -Plating layer forming process-

[0148] In the plating forming step, on one plate surface, on the plate surface provided with convex portions and flat portions in a base pattern steel plate provided with convex portions and flat portions with a height of less than 3 mm, a plating layer with an adhesion amount of 60 to 500 g / m2 per single surface is formed. 2 , and a plating layer including a zinc alloy layer.

[0149] The method for forming the plating layer is not particularly limited, and a known method can be used.

[0150] For example, a base pattern steel plate is heated to a temperature of the plating bath + 20°C to 850°C and maintained thereat, and then cooled to a range of the temperature of the plating bath to the temperature of the plating bath + 10°C, the cooled base pattern steel plate is immersed in the plating bath, and after being scooped out of the plating bath, when the temperature of the plating bath exceeds 500°C, it is cooled to 500°C at a cooling rate of 1 to 20°C / s to form a plating layer on the base pattern steel plate.

[0151] Here, the plating is performed by, for example, a continuous hot-dip metallization method such as a Mori strip nitriding galvanizing method. In addition, the base pattern steel sheet may be pre-plated (for example, pre-plated with Ni) after pickling and before heating.

[0152] -Chemical conversion treatment film formation process-

[0153] In the chemical conversion treatment film forming process, a grooved coating roller is used, wherein a plurality of grooves are arranged axially along the circumferential direction on the outer circumferential surface, the groove spacing is 0.2 to 1.0 mm, the groove height is 0.05 to 0.5 mm, and the ratio of the groove spacing to the groove height (groove spacing / groove height) is 2 to 8. A chemical conversion treatment solution (hereinafter also referred to as "solution") is applied to the surface of the coating layer at an angle within the range of 45±10° relative to the length direction of the convex portion of the base patterned steel plate of the circumferential direction of the grooved coating roller to form a chemical conversion treatment film layer.

[0154] Specifically, in the chemical conversion treatment film forming step, for example, Figure 2 The coating device shown in the figure applies a chemical conversion treatment liquid on the surface of the plated layer to form a chemical conversion treatment film layer. The coating device can be a well-known coating device equipped with a grooved coating roller.

[0155] Figure 2 The coating device shown in the figure comprises: a grooved coating roller for coating a coating liquid by transfer on the surface of the coating layer of the base pattern steel plate formed with the coating layer; and a support roller for supporting the base pattern steel plate disposed opposite to the base pattern steel plate through the base pattern steel plate. It should be noted that a coating roller on the opposite side may be disposed instead of the support roller. In this case, from the viewpoint of coating properties on the opposite side, the base pattern steel plate moves forward without changing the advancing direction by the roller.

[0156] The grooved coating roller is provided with a storage tray for storing the chemical solution and a dipping roller for dipping the chemical solution from the storage tray and supplying the chemical solution to the grooved coating roller. It should be noted that a conveying roller may be arranged between the dipping roller and the coating roller.

[0157] Here, in Figure 2 In the figure, 101 indicates a coating device, 10 indicates a grooved coating roller, 12 indicates a supporting roller, 14 indicates a storage tray, 14A indicates a chemical conversion treatment solution, 16 indicates a dipping roller, M1 indicates a base patterned steel plate with a coating, M2 indicates a base patterned steel plate with a chemical conversion treatment film and a coating, and A indicates a through-plate direction of the base patterned steel plate with a coating.

[0158] The grooved coating roller may be, for example, a coating roller including a metal roller and a rubber coating layer provided on the outer peripheral surface of the metal roller.

[0159] A plurality of grooves along the circumferential direction are arranged in the axial direction on the outer peripheral surface of the grooved coating roller.

[0160] In a grooved coating roller, the spacing of the grooves (refer to Figure 3 10P) is set to 0.2~1.0mm, and the groove height (refer to Figure 3 The groove height (10H) is set to 0.05-0.5 mm, and the ratio of the groove pitch to the groove height (groove pitch / groove height) is set to 2-8.

[0161] Here, the pitch of the grooves refers to both the groove width and the width of the convex portion formed between adjacent grooves. Generally, in a grooved paint roller, the groove width and the width of the convex portion formed between adjacent grooves are often the same.

[0162] It should be noted that Figure 3 In the figure, 10 indicates a grooved coating roller, 10A indicates a groove, 10P indicates a groove pitch, and 10H indicates a groove height.

[0163] If the groove pitch is set to 0.2 mm to 1.0 mm, the amount of drug solution carried out becomes an appropriate amount.

[0164] If the height of the groove is set to 0.05 mm or more, the amount of drug solution carried out becomes an appropriate amount. If the height of the groove is set to 0.5 mm or less, the air bite caused by the groove can be suppressed.

[0165] Furthermore, by setting the ratio of the spacing of the grooves in the grooved coating roller to the height of the grooves to 2 to 8, the amount of chemical conversion treatment liquid carried out can be guaranteed, and the liquid can be evenly applied even on the convex parts, flat parts and the boundaries between the convex parts and the flat parts (i.e., the end edges of the convex parts) of the base patterned steel plate.

[0166] By using such a grooved coating roller, the film thickness of the chemical conversion coating layer at the flat part of the base pattern steel plate and the film thickness ratio of the chemical conversion coating layer at the flat part and the convex part of the base pattern steel plate are within the above range. As a result, white rust is less likely to occur, and primary rust prevention failure can be suppressed.

[0167] In the grooved paint roller, the maximum width of the convex part of the base pattern steel plate (refer to Figure 1A The ratio of C) to the groove pitch (maximum width of the convex portion of the base pattern steel plate / groove pitch) is preferably set to, for example, 3.0 to 40.0.

[0168] If the ratio of the maximum width of the convex portion of the base pattern steel plate to the pitch of the grooves is set to 3.0 or more, the pitch of the grooves will not become too large relative to the maximum width of the convex portion of the base pattern steel plate. Therefore, the grooves holding the chemical solution are close to the boundary between the convex portion and the flat portion of the base pattern steel plate (i.e., the terminal edge of the convex portion), and the chemical solution becomes easy to apply and spread.

[0169] If the ratio of the maximum width of the convex portion of the base pattern steel plate to the pitch of the grooves is set to 40.0 or less, the pitch of the grooves will not become too small relative to the maximum width of the convex portion of the base pattern steel plate. Therefore, it is possible to prevent the grooves holding the chemical solution from becoming difficult to approach the boundary between the convex portion and the flat portion of the base pattern steel plate (i.e., the terminal edge of the convex portion), and the amount of the chemical solution carried out can be ensured. As a result, insufficient application of the chemical solution can be prevented.

[0170] Therefore, in the grooved coating roller, it is preferable to set the ratio of the maximum width of the convex portion of the base patterned steel plate to the pitch of the grooves within the above range. This ensures the amount of chemical conversion treatment liquid carried out, and makes it easier to evenly apply the liquid even on the convex portion, flat portion, and the boundary between the convex portion and the flat portion (i.e., the terminal edge of the convex portion) of the base patterned steel plate.

[0171] As a result, the film thickness of the chemical conversion coating layer at the flat part of the base pattern steel plate and the film thickness ratio of the chemical conversion coating layer at the flat part and the convex part of the base pattern steel plate become easily within the above range. As a result, white rust is less likely to occur, and primary rust prevention failure can be further suppressed.

[0172] In the chemical conversion treatment film forming step, the grooved coating roller is rotated, the chemical conversion treatment liquid is dipped from a storage pan storing the chemical conversion treatment liquid by a dip roller, and then the chemical conversion treatment liquid is supplied to the grooved coating roller.

[0173] After or simultaneously with the start of supplying the chemical conversion treatment liquid to the grooved coating roller, the base patterned steel plate is started to pass through, and the coating is transferred and applied to the coating surface of the base patterned steel plate passing through the chemical conversion treatment liquid supplied by the grooved coating roller.

[0174] In the chemical conversion coating layer forming step, the chemical conversion liquid is applied to the surface of the plated layer at an angle of 45±10° between the circumferential direction of the grooved coating roller and the longitudinal direction of the convex portion of the base patterned steel plate.

[0175] If the circumferential direction of the grooved paint roller is set to an angle within the range of 45±10° relative to the length direction of the convex portion of the base patterned steel plate, the height of the convex portion (i.e., the pattern height) in the width direction of the base patterned steel plate (i.e., the direction orthogonal to the through-plate direction of the base patterned steel plate) can be made consistent.

[0176] Therefore, in the width direction of the grooved paint roller, the contact area between the convex part and the roller becomes constant, and the pressing force of the grooved paint roller relative to the base patterned steel plate becomes uniform, so that the drug solution can be evenly applied even on the convex part, flat part and the boundary between the convex part and the flat part (i.e., the end edge of the convex part) of the base patterned steel plate.

[0177] Thus, the film thickness of the chemical conversion coating layer at the flat part of the base pattern steel plate and the film thickness ratio of the chemical conversion coating layer at the flat part and the convex part of the base pattern steel plate are within the above range. As a result, white rust is less likely to occur, and primary rust prevention failure can be suppressed.

[0178] Here, from the perspective of setting the film thickness of the chemical conversion treatment film layer at the flat part of the base patterned steel plate and the film thickness ratio of the chemical conversion treatment film layer at the flat part and the convex part of the base patterned steel plate to the above-mentioned range, the linear pressure of the grooved paint roller relative to the base patterned steel plate should be 1000 to 3000 (g / mm).

[0179] The rotation direction of the grooved coating roller may be the same direction as the passing direction of the base patterned steel plate, or may be the opposite direction to the passing direction of the base patterned steel plate. However, it is better if the rotation direction of the grooved coating roller is the opposite direction to the passing direction of the base patterned steel plate. If the rotation direction of the grooved coating roller is the opposite direction to the passing direction of the base patterned steel plate, the uneven coating of the chemical conversion treatment liquid can be suppressed during the coating of the chemical conversion treatment liquid, and the uneven film thickness of the chemical conversion treatment film layer can be suppressed.

[0180] It should be noted that the rotation direction of the grooved coating roller refers to the position opposite to the base patterned steel plate (i.e., Figure 2 The direction in the middle is the paint application position P1).

[0181] The amount of chemical solution supplied to the groove coating roller is appropriately set according to the thickness of the chemical conversion coating layer. The rotation speed of the groove coating roller is also appropriately set according to the thickness of the chemical conversion coating layer formed on the plated surface of the base patterned steel plate.

[0182] It should be noted that the sheet passing speed LS of the base pattern steel sheet is set to, for example, 20 to 200 m / min.

[0183] The chemical conversion treatment film layer is formed by forming a coating film of a chemical solution on the surface of the plating layer on the base patterned steel plate and then drying and / or curing the coating film.

[0184] The drying conditions and curing conditions of the coating film of the chemical solution may be appropriately set according to the chemical solution used.

[0185] Hereinafter, post-processing of the plated pattern steel sheet applicable to the present disclosure will be described.

[0186] The chemical conversion treatment film layer in the plated patterned steel sheet disclosed in the present invention may also have one or more layers of organic resin films. The organic resin is not limited to a specific type, and examples thereof include polyester resin, polyurethane resin, epoxy resin, acrylic resin, polyolefin resin, fluororesin, or modified forms of these resins. The modified forms referred to herein are resins obtained by reacting reactive functional groups contained in the structures of these resins with other compounds (monomers, crosslinking agents, etc.) having functional groups that can react with the functional groups in the structures.

[0187] As such an organic resin, one or more organic resins (unmodified organic resins) may be mixed and used, or one or more organic resins obtained by modifying at least one other organic resin in the presence of at least one organic resin may be mixed and used. In addition, the organic resin film may also contain any coloring pigment or rust-proof pigment. A substance that is water-based by dissolving or dispersing in water may also be used.

[0188] Example

[0189] The embodiments of the present disclosure are described, but the conditions in the embodiments are one condition example adopted to confirm the feasibility and effect of the present disclosure, and the present disclosure is not limited to this one condition example. As long as it does not deviate from the gist of the present disclosure and achieves the purpose of the present disclosure, the present disclosure can adopt various conditions.

[0190] (Example)

[0191] A predetermined amount of pure metal ingots were used, the ingots were dissolved, and then a plating bath was prepared in the air so as to obtain a plating layer having a chemical composition shown in Table 1. A batch hot dip plating device was used to form the plating layer.

[0192] Then, plating layers are formed on both surfaces of the base patterned steel plate as follows.

[0193] The base pattern steel plate was heated from room temperature by electric heating in a N2-H2 (5%) environment (dew point below -40°C, oxygen concentration below 25ppm), kept for 60 seconds, cooled to the plating bath temperature +10°C by blowing N2 gas, and immediately immersed in the plating bath. After that, the base pattern steel plate was scooped out of the plating bath, and the N2 gas wiping pressure was adjusted to adjust the amount of plating. The amount of plating on the plate surface with convex and flat parts was set as shown in Table 2.

[0194] It should be noted that the base pattern steel plate used is hot-rolled Al-killed steel, and the shape of the base pattern steel plate is set to be Figure 1A to Figure 1C Equal.

[0195] However, various hot-rolled patterned steel sheets having different shapes (height H of convex portions, maximum width C of convex portions) are used as base patterned steel sheets. Specific shapes are as follows.

[0196] ·Arrangement angle of convex parts A=45°

[0197] · Length of the protrusion B = 25.3 mm

[0198] Maximum width C of the convex portion = width shown in Table 2

[0199] ·Minimum width of convex part D = 2.5mm

[0200] ·Protrusion arrangement pitch E = 28.6mm

[0201] · Height of the convex portion (ie, pattern height) H = the height shown in Table 2

[0202] It should be noted that the area occupancy rate of the convex portion was set to 40%.

[0203] In some examples, as the base pattern steel sheet, a pre-plated Ni pattern steel sheet obtained by pre-plating Ni on the hot-rolled pattern steel sheet was used. The Ni deposition amount was set to 1 g / m 2 ~3g / m 2 In addition, the example using the Ni pre-plated checkered steel sheet as the base checkered steel sheet is described as “Pre-Ni” in the “Base checkered steel sheet” and “Type” columns in Table 2.

[0204] Next, the coating roller with grooves was used under the conditions shown in Table 2. Figure 2 The coating device shown in the figure applies a chemical conversion treatment liquid on the surface of the plated layer to form a chemical conversion treatment film layer.

[0205] In addition, in Table 2, "angle" represents the angle formed by the circumferential direction of the grooved coating roller with respect to the longitudinal direction of the convex portion of the base patterned steel plate.

[0206] In addition, the "line pressure" indicates the pressing force of the grooved paint roller relative to the base patterned steel plate.

[0207] Here, the chemical conversion treatment liquid used was as follows.

[0208] ·Medicinal solution A

[0209] A solution containing 3-aminopropyltriethoxysilane, 3-glycidoxypropyltrimethoxysilane, vanadyl sulfate, phosphoric acid, and fluorinated zirconic acid

[0210] ·Medicinal solution B

[0211] A liquid containing ammonium zirconium carbonate, acrylic resin, vanadyl oxalate, phosphoric acid, 1-hydroxyethane-1,1-diphosphonic acid, and cobalt nitrate

[0212] - Various measurements -

[0213] The following items were measured on the obtained plated pattern steel sheet according to the above-mentioned method.

[0214] The thickness of the chemical conversion coating layer at the flat portion of the base pattern steel plate (recorded as "flat portion thickness T1" in the table)

[0215] ·Thickness of the chemical conversion treatment film layer on the convex part of the base pattern steel plate (recorded as "convex part film thickness T2" in the table)

[0216] -One-time rust prevention-

[0217] The obtained plated pattern steel sheet was cut to collect a sample of 100 mm×50 mm.

[0218] Next, the back surface and end surface of the plate surface having the convex portion and the flat portion are sealed.

[0219] Next, the sample was subjected to a corrosion acceleration test (SST JIS Z 2371: 2015) for 24 hours, and the white rust occurrence area ratios of the convex portion and the flat portion were examined.

[0220] A white rust occurrence area ratio of 10% or less was evaluated as "A", more than 10% and 20% or less was evaluated as "B", more than 20% and 30% or less was evaluated as "C", and more than 30% was evaluated as "D".

[0221] ―Appearance-

[0222] The appearance of the obtained plated pattern steel sheet was observed. The details are as follows.

[0223] First, a straight tube fluorescent white light source (straight tube fluorescent lamp high light 6-shaped FL6W) manufactured by Panasonic was placed at a position 1 m away from the surface of each patterned surface.

[0224] Next, with the pattern surface irradiated with white light from a light source, photographs were taken of the pattern surface in an area of ​​1200 mm in width and 1000 mm in length at intervals of 100×100 mm.

[0225] The color difference ΔE in the range of 100×100 mm was measured from the reduced photograph.

[0226] Specifically, find CIE1976L * a * b * The coordinate value of the color system (L* Value, a * Value and b * Then, the color difference ΔE of the measurement location where the color difference ΔE is the largest is calculated for the average value of the L* value, a* value, and b* value. It should be noted that the color difference ΔE is calculated by ΔE=((Δa * ) 2 +(Δb * ) 2 +(ΔL * ) 2 ) 1 / 2 to define.

[0227] The average color difference ΔE in the entire area (that is, the pattern surface in an area of ​​1200 mm in width and 1000 mm in length) was measured and evaluated according to the following criteria.

[0228] A: The average color difference △E is less than 0.6

[0229] B: The average color difference △E is more than 0.6 and less than 1.2

[0230] C: The average color difference △E is 1.2 or more

[0231] -welding-

[0232] Two 100 mm x 50 mm steel plates were cut and collected from the obtained plated patterned steel plate. Another steel plate was vertically erected at the center of one of the obtained steel plates, and a weld was formed by arc welding on the side sandwiched by the patterned surface. Specifically, the two steel plates were cut according to Figure 1A The patterns of the base patterned steel plate shown in the figure are connected in a manner that another steel plate is vertically arranged in the center of one steel plate. In arc welding, a weld bead of 90 mm in length and 10 mm in width (surfacing width (side × √2 = 10 mm) when viewed from the welding 45-degree direction) is formed from the intersection of four lines of the convex part of the patterned steel plate in a right angle direction (C direction) relative to the rolling direction.

[0233] Arc welding was performed under the following conditions: welding wire: YM-28Z, welding speed: 40 cm / min, CO 2 Shielding gas flow rate: 20 liters / min, extension length: 15 mm, wire diameter: 1.2 mm, lamination pass: 1 time, welding current: 170 A, arc voltage: 23 V.

[0234] The obtained weld bead was subjected to X-ray projection, and the quality of the weld was evaluated based on the following criteria based on the pore opening rate of the fillet weld.

[0235] A: The pore opening rate is less than 3%, and no ripples or pits are observed in the weld.

[0236] B: The pore opening rate is 3% or more and less than 10%, and pits less than 1 mm are observed, but no ripples are observed in the weld bead.

[0237] C: Pore opening rate is 10% or more, pits with a size of 1 mm or more are observed, or wavy lines are observed in the weld bead

[0238] The Examples are listed in Tables 1 and 2.

[0239] [Table 1-1]

[0240]

[0241] [Table 1-2]

[0242]

[0243] [Table 2]

[0244]

[0245] From the above results, it is understood that the Examples corresponding to the plated pattern steel sheets of the present disclosure suppress primary rust prevention failure in both the flat portion and the convex portion as compared with the Comparative Examples.

[0246] The preferred embodiments and examples of the present disclosure are described in detail above, but the present disclosure is not limited to the examples. Anyone with ordinary knowledge in the technical field to which the present disclosure belongs can obviously think of various changes or modifications within the scope of the technical ideas recorded in the claims, and these are also understood to belong to the technical scope of the present disclosure.

[0247] It should be noted that the entire disclosure of Japanese Patent Application No. 2022-138733 is incorporated into this specification by reference.

[0248] All documents, patent applications, and technical notes described in this specification are incorporated into this specification by reference to the same extent as if each document, patent application, or technical note was specifically and individually described as being incorporated by reference.

Claims

1. A plated patterned steel plate, comprising: A base patterned steel plate having a convex portion and a flat portion with a height of less than 3.0 mm on one plate surface; a plating layer including a zinc alloy layer disposed on a plate surface of the base patterned steel plate having convex portions and flat portions; and A chemical conversion treatment film layer is provided on the surface of the plated layer, The film thickness of the chemical conversion treatment film layer at the flat portion of the base patterned steel plate is 0.10 to 5.00 μm per single surface. The film thickness ratio of the chemical conversion coating layer in the flat portion and the convex portion of the base patterned steel plate, that is, the film thickness of the chemical conversion coating layer in the flat portion / the film thickness of the chemical conversion coating layer in the convex portion, is 0.2 to 5.

0.

2. The plated patterned steel plate according to claim 1, wherein: The film thickness ratio of the chemical conversion treatment film layer of the flat portion and the convex portion of the base patterned steel plate is 0.4 to 1.

5.

3. The plated patterned steel plate according to claim 1 or claim 2, wherein: The film thickness ratio of the chemical conversion treatment film layer of the flat portion and the convex portion of the base patterned steel plate is 0.2 or more and less than 0.8 or 1.5 to 5.0.

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