WO2016162982A1 - Zn-Al-Mg系めっき鋼板、及びZn-Al-Mg系めっき鋼板の製造方法 - Google Patents
Zn-Al-Mg系めっき鋼板、及びZn-Al-Mg系めっき鋼板の製造方法 Download PDFInfo
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- WO2016162982A1 WO2016162982A1 PCT/JP2015/061020 JP2015061020W WO2016162982A1 WO 2016162982 A1 WO2016162982 A1 WO 2016162982A1 JP 2015061020 W JP2015061020 W JP 2015061020W WO 2016162982 A1 WO2016162982 A1 WO 2016162982A1
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- C—CHEMISTRY; METALLURGY
- C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
- C23C—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THE SURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTION; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL
- C23C2/00—Hot-dipping or immersion processes for applying the coating material in the molten state without affecting the shape; Apparatus therefor
- C23C2/04—Hot-dipping or immersion processes for applying the coating material in the molten state without affecting the shape; Apparatus therefor characterised by the coating material
- C23C2/06—Zinc or cadmium or alloys based thereon
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- B—PERFORMING OPERATIONS; TRANSPORTING
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- B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- B32B15/00—Layered products comprising a layer of metal
- B32B15/01—Layered products comprising a layer of metal all layers being exclusively metallic
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- B32—LAYERED PRODUCTS
- B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- B32B15/00—Layered products comprising a layer of metal
- B32B15/01—Layered products comprising a layer of metal all layers being exclusively metallic
- B32B15/012—Layered products comprising a layer of metal all layers being exclusively metallic one layer being formed of an iron alloy or steel, another layer being formed of aluminium or an aluminium alloy
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- B—PERFORMING OPERATIONS; TRANSPORTING
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- B32B15/00—Layered products comprising a layer of metal
- B32B15/01—Layered products comprising a layer of metal all layers being exclusively metallic
- B32B15/017—Layered products comprising a layer of metal all layers being exclusively metallic one layer being formed of aluminium or an aluminium alloy, another layer being formed of an alloy based on a non ferrous metal other than aluminium
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- B32B15/00—Layered products comprising a layer of metal
- B32B15/04—Layered products comprising a layer of metal comprising metal as the main or only constituent of a layer, which is next to another layer of the same or of a different material
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- B32—LAYERED PRODUCTS
- B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- B32B15/00—Layered products comprising a layer of metal
- B32B15/04—Layered products comprising a layer of metal comprising metal as the main or only constituent of a layer, which is next to another layer of the same or of a different material
- B32B15/043—Layered products comprising a layer of metal comprising metal as the main or only constituent of a layer, which is next to another layer of the same or of a different material of metal
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B32—LAYERED PRODUCTS
- B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- B32B15/00—Layered products comprising a layer of metal
- B32B15/18—Layered products comprising a layer of metal comprising iron or steel
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B32—LAYERED PRODUCTS
- B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- B32B15/00—Layered products comprising a layer of metal
- B32B15/20—Layered products comprising a layer of metal comprising aluminium or copper
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- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
- C21D9/00—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor
- C21D9/46—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor for sheet metals
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- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
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- C22C18/00—Alloys based on zinc
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- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
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- C22C18/00—Alloys based on zinc
- C22C18/04—Alloys based on zinc with aluminium as the next major constituent
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- C23C2/04—Hot-dipping or immersion processes for applying the coating material in the molten state without affecting the shape; Apparatus therefor characterised by the coating material
- C23C2/12—Aluminium or alloys based thereon
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- C23C2/00—Hot-dipping or immersion processes for applying the coating material in the molten state without affecting the shape; Apparatus therefor
- C23C2/26—After-treatment
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- C23C2/00—Hot-dipping or immersion processes for applying the coating material in the molten state without affecting the shape; Apparatus therefor
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- C23C2/28—Thermal after-treatment, e.g. treatment in oil bath
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- C23C—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THE SURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTION; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL
- C23C2/00—Hot-dipping or immersion processes for applying the coating material in the molten state without affecting the shape; Apparatus therefor
- C23C2/26—After-treatment
- C23C2/28—Thermal after-treatment, e.g. treatment in oil bath
- C23C2/29—Cooling or quenching
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- C23C—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THE SURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTION; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL
- C23C2/00—Hot-dipping or immersion processes for applying the coating material in the molten state without affecting the shape; Apparatus therefor
- C23C2/34—Hot-dipping or immersion processes for applying the coating material in the molten state without affecting the shape; Apparatus therefor characterised by the shape of the material to be treated
- C23C2/36—Elongated material
- C23C2/40—Plates; Strips
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- C23C—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THE SURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTION; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL
- C23C30/00—Coating with metallic material characterised only by the composition of the metallic material, i.e. not characterised by the coating process
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- C23C30/00—Coating with metallic material characterised only by the composition of the metallic material, i.e. not characterised by the coating process
- C23C30/005—Coating with metallic material characterised only by the composition of the metallic material, i.e. not characterised by the coating process on hard metal substrates
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
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- Y10T428/12493—Composite; i.e., plural, adjacent, spatially distinct metal components [e.g., layers, joint, etc.]
- Y10T428/12736—Al-base component
- Y10T428/1275—Next to Group VIII or IB metal-base component
- Y10T428/12757—Fe
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
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- Y10T428/12792—Zn-base component
- Y10T428/12799—Next to Fe-base component [e.g., galvanized]
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
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- Y10T428/12979—Containing more than 10% nonferrous elements [e.g., high alloy, stainless]
Definitions
- the present invention relates to a Zn—Al—Mg plated steel sheet and a method for producing a Zn—Al—Mg plated steel sheet.
- a hot-dip galvanized steel sheet having a composition containing Zn, Al and Mg as main components and adding an additive element such as Si as required is widely used or proposed.
- These platings have excellent corrosion resistance due to the influence of alloying elements compared to Zn plating and Al plating.
- Patent Document 1 For example, in Patent Document 1 below, one or two single phases of MgZn 2 and Mg 2 Zn 11 are precipitated in a plating layer with a particle size of 0.5 ⁇ m or more, and an unpainted processed part and An invention relating to a hot-dip Zn—Al—Mg plated steel material excellent in corrosion resistance of the painted end face portion is disclosed.
- Mg has excellent corrosion resistance. Specifically, Mg does not exist finely distributed in the ternary eutectic in the form of an intermetallic compound, but a single particle of MgZn 2 or Mg 2 Zn 11 having a particle size of 0.5 ⁇ m or more. It shows that it is better to improve the corrosion resistance if the phase is formed and is present independently in the plating layer.
- Patent Document 2 listed below, one or two of Al phase, Zn phase, MgZn 2 and Mg 2 Zn 11 which are granular microcrystals having a size of 0.3 ⁇ m or less in the plated layer of the hot dip galvanized steel sheet.
- the invention relating to the hot-dip galvanized steel sheet having the above dispersed and excellent corrosion resistance after processing is disclosed.
- the structure and the crystallites having an average particle diameter of 0.3 ⁇ m or less of the above-mentioned phase and the above-mentioned compound are randomly dispersed, thereby reducing processing cracks and processing. It is said that it has excellent later corrosion resistance.
- Patent Document 3 listed below has a plating layer on at least one surface of a steel plate, and the Mg—Zn-based compound contained in the plating layer does not exist in the form of a lump, and the plating surface layer starts from the vicinity of the interface between the plating layer and the ground iron.
- An invention relating to a Zn—Al—Mg based plated steel sheet is disclosed, which grows in a columnar shape in the direction and exists in a columnar shape exposed on the surface of the plating layer, the exposed area on the surface of the plating layer is 15 to 60%.
- the Mg—Zn compound is grown in a columnar shape by Ni plating as a pretreatment, and the Mg—Zn compound is gradually dissolved at a constant rate from the initial stage of corrosion until the entire plating disappears. It is said that an appropriate amount of Mg that can contribute to corrosion prevention is supplied to the plating surface. And the effect is confirmed by the stable corrosion resistance in the wet and dry repeated environment.
- Patent Document 4 in order to improve the non-uniform appearance caused by the crystallization of the MgZn 2 and Mg 2 Zn 11 phases mixed during solidification of the Zn—Al—Mg plating, An invention relating to a technique of spraying water or an aqueous solution in droplets from the start to the end of solidification on the entire surface of the plating layer is disclosed.
- the Al / Zn / Mg 2 Zn 11 ternary eutectic structure has a primary metal structure or a metal structure in which an Al primary crystal and a Zn single phase are mixed. It is going to be an appearance.
- the generation of the Mg 2 Zn 11 phase is suppressed and appearance defects are prevented.
- Patent Document 1 Japanese Patent Application Laid-Open No. 2001-20050
- Patent Document 2 Japanese Patent Application Laid-Open No. 2003-147500
- Patent Document 3 Japanese Patent Application Laid-Open No. 2010-100957
- Patent Document 4 Japanese Patent Application Laid-Open No. 10-265926
- Patent Document 5 Japanese Patent Application Laid-Open No. 10-265926
- Patent Document 6 International Publication WO 2007/108496
- Patent Document 7 JP 2004-68075
- Patent Document 8 JP 10-265926
- Patent Document 9 JP 10-226865
- Patent Document 10 Japanese Patent Application Laid-Open No. 2002-047549
- Patent Document 11 Japanese Patent Application Laid-Open No. 2002-047548
- Patent Document 12 Japanese Patent Application Laid-Open No. 2002-030405
- Patent Document 1 and Patent Document 2 specify the particle size of the product.
- the plating composition range is specified, and MgZn 2 and Mg 2 Zn 11 having a particle diameter of 0.5 ⁇ m or more exist as “single phase”, so that Mg having a high concentration stabilizes the corrosion product of zinc. It is indicated in the specification that the corrosion resistance is greatly improved by the effect of increasing the cooling rate and that the cooling rate is better.
- Patent Document 2 all Al phases, Zn phases, MgZn 2 and Mg 2 Zn 11 are dispersed in the plating layer with a particle size of 0.3 ⁇ m or less by cooling the solidification point ⁇ 20 ° C. at 40 ° C./second or more.
- Patent Document 1 and Patent Document 2 are greatly different from each other in the specified range regarding the particle diameter, and there is no part common to the manufacturing conditions.
- Patent Document 1 attempts to improve the corrosion resistance itself by actively generating and growing an Mg—Zn alloy containing Mg having a high corrosion resistance at a high concentration.
- Patent Document 2 shows a method of preventing a factor that the corrosion resistance is greatly deteriorated by preventing physical cracks or the like during plating layer processing by preventing particles having different forms and hardnesses from coexisting.
- Patent Document 1 has a problem that growing a single-phase structure increases a physical property difference from the remaining phases, and easily causes cracks during processing. That is, it is a material that is very difficult to use as a processed product as seen in building materials such as home appliances such as refrigerators, air conditioners, and video equipment, outdoor equipment racks, building outer walls, and cable racks.
- Patent Document 2 the problem is that the average corrosion resistance is sacrificed.
- Patent Document 3 exemplifies the definition of the existence form of a compound depending on the difference in plating pretreatment.
- a very special microstructure usually horizontal growth
- Ni plating is applied to the steel plate surface by electroplating, and after immersion treatment in an acid aqueous solution, it is necessary to apply plating by heating at a temperature (500 ° C or less) that does not alloy with the base iron in a non-oxidizing or reducing atmosphere. There is.
- a general plating line has a built-in annealing furnace (maximum temperature of about 800 ° C.) in the previous stage of the plating process, which is a special condition that cannot be realized with such a line.
- Corrosion weight loss (JASO test) equivalent to that of the present invention is proposed as the corrosion resistance.
- Ni plating as a pretreatment is expensive in equipment cost and operation cost, and is difficult to use for inexpensive home appliances and building materials.
- Patent Document 3 columnar crystals are generated after Ni plating. It is described that when the Ni plating is less than a predetermined amount, the corrosion resistance is inferior without forming columnar crystals. When there is no Ni plating, it is thought that it has corrosion resistance equivalent to Patent Document 1.
- Patent Documents 4 and 5 exemplify methods for improving the appearance by optimizing phases by controlling the cooling method.
- Patent Document 4 describes that only Mg 2 Zn 11 is produced as an MgZn alloy in an Al / Zn / MgZn alloy (ternary eutectic) by rapid cooling by spraying water or an aqueous solution.
- a general liquid spraying method including a plating process there are a gas-liquid nozzle for entraining a liquid in a gas jet and a liquid nozzle for spraying a liquid in a mist form by pressurization.
- Patent Document 5 since the main purpose is to eliminate Mg 2 Zn 11 generated by supercooling by slowly performing secondary cooling, the physical property difference between the generated multiple phases is the same as in Patent Document 1. As a result, cracking is likely to occur after processing, and corrosion resistance is likely to be impaired. Although there is no description regarding the corrosion resistance, it is considered to be a general Mg—Zn—Al plating level because the cooling rate is further lower.
- Patent Documents 6 to 12 also examine the corrosion resistance of Zn—Al—Mg based plating, but the current situation is that further improvement is required.
- the present invention has been made in view of the above problems.
- the object of the present invention is a fine crystal structure that is superior in corrosion resistance and processability to conventional products typified by Patent Documents 1 to 2, and 4 to 12, although it is a conventional composition.
- the corrosion resistance equivalent to the corrosion resistance obtained by the special pretreatment and the equipment configuration in Patent Document 3 can be easily obtained by a general plating line configuration, and the corrosion resistance is stably maintained.
- the present inventor By investigating the production conditions of the plating layer, the solidification structure, and the relationship between the product and the corrosion resistance, the present inventor has excellent corrosion resistance and improved corrosion resistance compared to conventional Zn-Al that is stably maintained.
- a method for producing a —Mg-based plated steel sheet and a Zn—Al—Mg-based plated steel sheet was obtained.
- the present invention has been completed based on the above findings, and the gist of the invention is as follows.
- Al is 4 to 22% by mass
- Mg is 1.0 to 6.5% by mass and less than 1/2 by mass of Al
- Si is 0.001 to 1.000% by mass
- the balance is Zn
- the structure of the plating layer is a cellular dendrite-like first Al primary crystal having an area ratio of 30 to 70% and a second axis interval of 0.5 to 2.0 ⁇ m, and the total area ratio is 30 to 70.
- a second equiaxed dendritic Al primary crystal having a main axis length of 5 to 10 ⁇ m and a second axis interval of 0.5 to 2.0 ⁇ m, and a main axis length of 0.5 to 3.0 ⁇ m.
- the plating layer is further 0.0001 to 1.0000 mass, alone or in combination of one or more selected from Ti, Nb, Fe, Ni, Cr, Sn, Mn, and B. % Zn-Al-Mg based plated steel sheet according to (1).
- Al is 4 to 22% by mass
- Mg is 1.0 to 6.5% by mass and less than 1/2 of Al
- Si is 0.001 to 1.000% by mass
- the balance is Zn.
- the hot-dip zinc-plated steel sheet is set to a temperature at which the Al primary crystal starts to solidify + 30 ° C. to 520 ° C., and the temperature from that temperature to 370 ° C. is cooled at a cooling rate of 500 ° C./second or more.
- a Zn—Al—Mg based plated steel sheet having excellent corrosion resistance and stably maintaining the corrosion resistance, and a method for producing a Zn—Al—Mg plated steel sheet. And it can be set as the product which can be used for a long period of time by using the plated steel plate of this invention for a household electrical appliance, a building material, etc.
- FIG. 3 is a schematic plan view showing the shape of an Al primary crystal in a plating layer of a Zn—Al—Mg based plated steel sheet of the present invention. It is a figure which shows the SEM photograph which observed the plating layer of the Zn-Al-Mg type plated steel plate of this invention from the surface. It is a figure which shows the SEM photograph which observed the cross section of the plating layer of the Zn-Al-Mg type plated steel plate of this invention. It is a figure which shows the SEM photograph which observed the plating layer of the Zn-Al-Mg type plated steel plate of the comparative example from the surface.
- the present inventor has studied the Zn—Al—Mg-based plated steel sheet in consideration of the component elements of the plating layer, the cooling method, and the like from the viewpoint of improving the uniformity of the solidified structure.
- the structure of the plating layer that is excellent in corrosion resistance and stably maintains corrosion resistance is as follows: 1) There are unprecedented fine Al primary crystals with different solidification structure shapes in a certain ratio or more. It has been found that it is important to manufacture so that the structure other than the crystal is composed of a predetermined ternary eutectic structure. And it came to the plated steel plate of this invention which is excellent in corrosion resistance, and the corrosion resistance is maintained stably.
- the plating layer is based on Zn and has improved corrosion resistance by containing Al and Mg. Furthermore, the plating layer is one in which the adhesion between the plating layer and the steel sheet is enhanced by the inclusion of Si. Specifically, the plating layer comprises 4 to 22% by mass of Al, 1.0 to 6.5% by mass of Mg and 1/2% or less of Al by mass%, and 0.001 to 1.000% by mass of Si. , And the balance contains Zn and impurities. However, the plating layer is preferably a plating layer containing Al, Mg, and Si in the above-described content, with the balance being Zn and impurities.
- the Al content is 4-22% by mass.
- the content of Al is preferably 5 to 15% by mass.
- the Mg content is 1.0 to 6.5% by mass.
- the Mg content is less than 1.0% by mass, the effect of improving corrosion resistance is insufficient. If the Mg content exceeds 6.5% by mass, the amount of Mg oxide produced in the plating bath becomes excessive, and the plating appearance deteriorates. From the same viewpoint, the Mg content is preferably 2 to 5% by mass.
- the Mg content is not more than 1/2 of Al by mass%. That is, the ratio of the Mg content to the Al content (Mg content / Al content) is 1 ⁇ 2 or less. If the Mg content exceeds 1/2 of Al (Al content), Al primary crystals are difficult to be generated or will not be generated for equilibrium, and an average Mg composition can be achieved with a fine crystal structure. It is difficult or impossible to take the structures of cellular dendritic Al primary crystals, micro equiaxial dendritic Al primary crystals, petal-like Al primary crystals, and Al primary crystals of other shapes. Further, Mg 2 Si is generated and takes a non-uniform structure. From the same viewpoint, the Mg content is preferably 1/3 or less of Al by mass%.
- the Si content is 0.001 to 1.000 mass%.
- the Si content is less than 0.001% by mass, excessive growth of the Fe—Al-based alloy layer occurs at the interface between the plating layer and the steel sheet, resulting in insufficient adhesion between the plating layer and the steel sheet. If the Si content exceeds 1.000% by mass, the effect of suppressing the formation of the Fe—Al-based alloy layer is saturated and the workability of the plated steel sheet may be reduced. From the same viewpoint, the Si content is preferably 0.100 to 0.500% by mass.
- Si may be preferentially precipitated due to the composition of Mg 2 Si depending on the composition, but in the scope of the present invention, in a state where it is solid solution or finely precipitated in an Al primary crystal or a structure other than the Al primary crystal. Included in the plating layer.
- Impurities are contained in the steel sheet itself, or components that adhere to the steel sheet in the pre-plating process and diffuse into the plating layer after plating, or are contained in the plating bath, and are plated directly in the plating process.
- the impurity include Pb, Sb, Co, Cu, In, Bi, Be, Zr, Ca, Sr, Y, Ce, and Hf.
- the impurity content is preferably 0.0010% by mass or less.
- the Zn—Al—Mg-based plating layer may further contain 0.0001 to 1.0000% by mass of one or more selected elements, alone or in combination.
- the plating layer is 0.0001 to 1.0000% by mass of one or more selected from Ti, Nb, Fe, Ni, Cr, Sn, Mn, and B alone or in combination. You may contain.
- these selective elements when they are immersed in the plating bath, they elute from the steel sheet to the plating layer side, and since diffusion continues to a certain temperature even during cooling, from the viewpoint of early stabilization of the composition near the interface between the plating layer and the steel sheet
- Fe is present in the plating layer to the extent of saturated dissolution.
- the amount of selected elements other than Fe is smaller than that of Fe, the type and amount determined for each steel type are components contained in the steel plate, and it is preferable to aim for early stabilization of the composition similar to Fe.
- These selective elements have a small influence on the formation of the dendritic structure of the Al primary crystal, but if the amount is large, the diffusion of Al or Mg may be inhibited. Therefore, the content of these elements is 0.0005 to 0.2000 mass% is preferable.
- These selective elements are contained in the plating layer in a state of solid solution or fine precipitation in an Al primary crystal or a structure other than the Al primary crystal.
- the content of the selective element is the total amount of the selective element contained in the plating layer.
- containing a selective element in the plating layer in combination indicates that the selective element is contained in the plating layer as a compound containing two or more selective elements.
- the amount of the plating composed of such component elements can be appropriately selected according to the use, but is usually, for example, 30 to 150 g / m 2 per side.
- the structure of the plating layer of the present invention is composed of an Al primary crystal and a structure other than the Al primary crystal.
- This Al primary crystal is an Al primary crystal containing Mg, Si and Zn in addition to Al.
- the Al primary crystal is a cellular dendrite-shaped first Al primary crystal (hereinafter “ Cellular dendrite Al primary crystal ”), the total area ratio is 30-70%, the main axis length is 5-10 ⁇ m, and the second axis interval is 0.5-2.0 ⁇ m.
- Second Al primary crystal hereinafter also referred to as “micro equiaxed dendritic Al primary crystal” and a third Al primary crystal having a principal axis length of 0.5 to 3.0 ⁇ m (hereinafter referred to as “petal Al primary crystal”) ")
- the area ratio of each Al primary crystal is a ratio with respect to the volume of all the Al primary crystals.
- the Al primary crystal of the present invention belongs to a cellular dendrite Al primary crystal, a fine equiaxed dendrite Al primary crystal, a petal-like Al primary crystal, and the above three types of Al primary crystals, as crystals having a shape that does not exist in a conventional plating layer.
- Al primary crystals of other shapes such as no block shape (lumb shape) are included.
- the area ratio of Al primary crystals of other shapes is preferably less than 40%.
- the secondary axis spacing does not satisfy the above range
- Al primary crystals are included.
- the cellular dendrite Al primary crystal has a structure having a plurality of principal axes grown in parallel and a plurality of second axes orthogonal to the principal axes (see FIGS. 9A and 9B). ).
- interval of cellular dendrite Al primary crystal shows the space
- the micro equiaxed dendritic Al primary crystal has a structure having a main axis that grows radially from the center and a second axis that grows in a branch shape from the main axis.
- the principal axis length of the micro equiaxed dendrite Al primary crystal indicates the length D21 from the tip on the center side to the other end.
- the second axis interval of the micro equiaxed dendrite Al primary crystal indicates the interval D22 between the central axes of the adjacent second axes.
- the petal-like Al primary crystal has a structure having a main axis that grows radially from the center.
- the petal-like Al primary crystal is considered to be an equiaxed crystal in which the secondary axis (secondary branch) is not developed.
- the main axis length of the petal-like Al primary crystal indicates the length D31 from the tip on the center side to the other end.
- FIG. 1 is a schematic plan view showing the shape of the Al primary crystal of the plating layer of the present invention.
- FIG. 2 shows an example of a SEM (Scanning Electron Microscope) photograph in which the Zn—Al—Mg-based plating layer of the present invention is observed from the surface.
- FIG. 2 shows SEM photographs at a magnification of 100 times and a magnification of 1000 times.
- FIG. 3 shows an example of a SEM (Scanning Electron Microscope) photograph in which a cross section of the Zn—Al—Mg plating layer of the present invention is observed.
- FIG. 3 shows an SEM photograph at a magnification of 1000 times.
- FIG. 4 shows an example of a SEM (Scanning Electron Microscope) photograph in which the Zn—Al—Mg-based plating layer of the comparative example (the plating layer of the comparative example) is observed from the surface.
- FIG. 4 shows SEM photographs at a magnification of 100 times and a magnification of 1000 times.
- the plating layer of a comparative example is a plating layer when the plated steel sheet is manufactured by a normal cooling method such as gas cooling or air-water cooling by plating the steel sheet using molten zinc having the same component as the present invention. .
- the plating layer of the comparative example has an Al primary crystal having an equiaxed structure with a main axis length of 50 to 200 ⁇ m and a second axis interval of 5 to 20 ⁇ m.
- the plating layer of the present invention has a cellular dendrite Al primary crystal having the above-mentioned size and a micro-equal axis of the above size compared to the Al primary crystal of the plating layer of the comparative example. It can be seen that it has a dendritic Al primary crystal and an Al primary crystal having a fine solidified structure including petal-like Al primary crystals of the above size.
- the fine equiaxed dendritic Al primary crystal of the above-mentioned size in the plating layer of the present invention and the petal-like Al primary crystal of the above size are fine Al primary crystal structures, and the coarse equiaxed structure in the plating layer of the comparative example It is distinguished from the Al primary crystal.
- a region surrounded by a solid line indicates a region having a cellular dendrite Al primary crystal (a cellular dendrite-like Al primary crystal).
- a region surrounded by an alternate long and short dash line indicates a region having a micro equiaxed dendrite Al primary crystal.
- a region surrounded by a two-dot chain line indicates a region having a petal-like Al primary crystal and another shape (block-like) Al primary crystal.
- the structure of the Al primary crystal to be generated changes mainly depending on the cooling start temperature and the cooling rate.
- the corrosion resistance of the Zn—Al—Mg-based plating layer is due to the effect of Mg, but it has been found that the shape and distribution of the Al primary crystal that is generated first has an effect in order to stably maintain the corrosion resistance.
- the inventors of the present invention include three types of Al primary crystals, Al dendritic Al primary crystals having the above-mentioned size, micro equiaxed dendritic Al primary crystals having the above-mentioned sizes, and petal-like Al primary crystals having the above-mentioned sizes, as Al primary crystals.
- the area ratio of the cellular dendrite Al primary crystal is preferably 40 to 70% and more preferably 50 to 70% from the viewpoint of improving the corrosion resistance and stably maintaining the corrosion resistance. From the same point, the area ratio of the fine equiaxed dendrite Al primary crystal and the petal-like Al primary crystal is preferably 30 to 60%, and more preferably 30 to 40%. These tissues may also be included together.
- the cellular dendrite Al primary crystal can be identified by whether or not the dendrite shape is developed in a 90-degree direction when viewed from above (see FIG. 2). Since the second axis (secondary branch) of the dendrite is also perpendicular to the first axis (primary branch) in the cross section, the cellular dendrite shape can be confirmed (see FIG. 3). However, an oblique cross section may appear on the surface, and in this case, a rhombus is formed. Also, when viewed in a cross section perpendicular to the surface, it can be seen that the second axis (secondary branch) is developed perpendicular to the first axis (primary branch).
- the structure in the same cross section of the conventional plated steel sheet can be seen from FIG. 4 that the second axis (secondary branch) does not develop at right angles to the first axis (primary branch). Segregation between cellular dendrite Al primary crystals has less variation than micro equiaxed dendrite Al primary crystals and petal-like Al primary crystals, so that the inclusion of cellular dendrite Al primary crystals in a predetermined range will provide even better corrosion resistance. It is considered to be.
- the fine equiaxed dendrite Al primary crystal has a main axis (stem), and a second axis (primary branch) and a third axis (secondary branch) are developed.
- the petal-like Al primary crystal has only the main axis and the second and third axes do not exist, but when viewed from the top, it develops into a cell shape in the 90-degree direction, similar to the micro equiaxed dendritic Al primary crystal.
- the trunk variation is also large.
- the manufacturing method in the cooling rate range of the present invention it is possible to clearly distinguish and define the form between the micro equiaxed dendritic Al primary crystal and the petal-like Al primary crystal, but in a part of the comparative example, When the cooling rate is low, not only the main axis but also the second and third axes are likely to develop, making it difficult to distinguish between the two types of Al primary crystals. For this reason, in the comparison of the area ratio of the Al primary crystal in the present invention, the total area ratio of the fine equiaxed dendritic Al primary crystal and the petal-like Al primary crystal is expressed as a cellular dendrite Al primary crystal having a clearly different structure. And it was decided to compare with the area ratio of Al primary crystals of other shapes.
- the area ratios of the cellular dendrite Al primary crystal, the micro equiaxed dendrite primary crystal, the petal-like Al primary crystal, and the Al primary crystal of other shapes are values obtained by the following method.
- each Al primary crystal is an area of a region where the Al primary crystal is present and includes an eutectic structure existing between the Al primary crystal and the Al primary crystal tree (between axes). That is, the area ratio of each Al primary crystal is the area ratio of a region including the Al primary crystal and the eutectic structure existing between the trees of the Al primary crystal (between axes).
- the structure other than the Al primary crystal is composed of a ternary eutectic structure of Al, Zn, and Mg 2 Zn 11 .
- this ternary eutectic structure may contain a trace amount (5% by volume or less) of MgZn 2 .
- the structure of the plating layer of the present invention does not contain Mg 2 Si.
- “not containing Mg 2 Si” means, for example, “not determined as a peak when an X-ray diffraction spectrum is measured”.
- the Mg 2 Si peak is less than noise (about 50 CPS) with respect to the maximum peak intensity of 35,000 CPS. There was no detection.
- the corrosion resistance was improved by including Mg 2 Si.
- Mg 2 Si since the plating crystal that has not existed in the past further enhances the corrosion resistance, it is more preferable that Mg 2 Si is not present. It is thought that there is no influence.
- a hot-dip zinc having the same component as that of the present invention is used to plate a steel plate and a plated steel plate is produced by a normal cooling method such as gas cooling or air-water cooling, for example, a spindle length of 50 to 200 ⁇ m, second An equiaxed dendritic Al primary crystal having an axial interval of 5 to 20 ⁇ m is formed in a dispersed state in a eutectic composed of Zn, Al, and MgZn 2 (see FIG. 4).
- Mg 2 Zn 11 should be stably generated as an equilibrium composition from the ternary equilibrium diagram, but the driving force of precipitation is close, and usually the nucleation / growth rate is high. MgZn 2 is preferentially generated. Note that, under the operation conditions shown in Patent Document 4 using liquid spray cooling, the influence of the nucleation / growth rate is relatively reduced due to the increase in the solidification rate, so that Mg 2 Zn 11 close to the equilibrium composition is easily generated. I think. Further, in Patent Document 5, Mg 2 Zn 11 is generated in a portion where the degree of supercooling is high, and it may be considered that MgZn 2 is generated when uniform cooling can be performed avoiding uneven cooling. Further, regarding the Mg—Si compound, since Mg is contained in the molten zinc, usually Mg 2 Si is generated. However, in the present invention, the compound is generated deviating from the equilibrium diagram. It is considered that Mg 2 Si is not often generated.
- FIG. 5A shows the intensity of the X-ray diffraction spectrum of the plating layer of the present invention (the plated steel sheet (5) used in the examples) corresponding to the diffraction angle 2 ⁇ .
- FIG. 5B shows the intensity
- ⁇ black circle
- ⁇ black inverted triangle
- ⁇ black square
- MgZn 2 the peak of MgZn 11
- ⁇ black diamond
- Mg 2 Zn 11 The peak of is shown. Since Si has a low concentration, the X-ray diffraction intensity is small and no peak is obtained. The intensity of the X-ray diffraction spectrum was measured using RINT2000 manufactured by Rigaku Corporation with a Cu (K ⁇ ) radiation source under the conditions of a tube voltage of 40 kV and a tube current of 150 mA.
- the element distributions of Mg, Al, Zn, and Si were examined. As shown in FIG. 6, the concentration distribution of Mg and Si was high (white) in the same region, and There were a plurality of (black) spots where Al and Zn were not distributed, and the presence of the Mg—Si compound was confirmed. Thereby, the plating layer of the comparative example, it was found that there is a high possibility that Mg 2 Si is present.
- FIG. 6 shows each element distribution of Mg, Al, Zn and Si by EDS (Energy Dispersive X-ray Spectrometer) together with SEM (Scanning Electron Microscope) photograph observing the cross section of the plating layer of the comparative example. The measurement results are shown. For each element, the brighter the concentration is.
- the plating layer of the comparative example manufactured by the normal cooling method is highly likely to be composed of Zn, Al, Si, MgZn 2, Mg 2 Si
- the plating layer is made of Al, Zn, Si, and Mg 2 Zn 11 . That is, in the structure of the plating layer of the present invention, Mg 2 Si is not included, and the structure other than the Al primary crystal is composed of a ternary eutectic structure of Al, Zn, and Mg 2 Zn 11. Become a different organization.
- Si is considered to be contained as a solid solution or other fine precipitate in the ternary eutectic structure of Al, Zn, and Mg 2 Zn 11 .
- the structure of the structure other than the primary Al crystal to be generated changes mainly depending on the cooling start temperature and the cooling rate.
- the corrosion resistance of the Zn—Al—Mg plating layer is affected by the Mg distribution and the composition of the Mg—Zn compound.
- the inventors set the Al primary crystal as the above structure, and changed the structure other than the Al primary crystal to a ternary eutectic of Al, Zn, and Mg 2 Zn 11. It has been found that by constituting the structure, the corrosion resistance is excellent and the corrosion resistance (corrosion weight loss) is stably maintained.
- the plating structure of the present invention is a structure different from the conventional plating structure, it is preferable that the structure of the Zn—Al—Mg-based plating layer does not contain Mg 2 Si. Furthermore, it was found that the corrosion resistance is excellent and the corrosion resistance (corrosion weight loss) is stably maintained.
- FIG. 7 shows elemental distributions of Mg, Al, Zn, and Si by EDS (Energy Dispersive X-ray Spectrometer) together with SEM (Scanning Electron Microscope) photograph of the plating layer of the present invention observed from the surface. The measurement results are shown. For each element, the brighter the concentration is. Similarly, each element distribution of Mg, Al, Zn, and Si in the Zn—Al—Mg plating layer of the comparative example was examined.
- the measurement result of each element distribution of Mg, Al, Zn, and Si by EDS is shown with the SEM photograph which observed the plating layer of the comparative example from the surface.
- the plating layer of a comparative example is a plating layer when a plated steel sheet is manufactured by a normal cooling method such as gas cooling or air-water cooling after plating on a steel sheet using molten zinc having the same composition as the present invention. is there.
- Mg is distributed in a ternary eutectic structure other than the equiaxed dendritic Al primary crystal
- Zn is other than the equiaxed dendritic Al primary crystal.
- both Mg and Zn are distributed throughout the plating layer.
- the Al concentration of the cellular dendrite Al primary crystal (Al component ratio) is lower than the Al concentration of the micro equiaxed dendritic Al primary crystal (center portion) and the petal-like Al primary crystal.
- the plating layer of the present invention is different in element distribution from the plating layer of the comparative example. And the present inventors think that the element distribution state of the plating layer also contributes to improvement and maintenance of corrosion resistance.
- the ratio (mass ratio) of the component elements of the structure of each structure in the Zn—Al—Mg plating layer of the comparative example was examined.
- Table 2 in the plated layer of the comparative example, 1B) the principal axis of the Al primary crystal of the equiaxed structure, 2B) the central part of the Al primary crystal of the equiaxed structure, 3B) the root between the principal axes of the Al primary crystal of the equiaxed structure 4B) Structure other than the Al primary crystal located at the tip between the primary axes of the Al primary crystal of the equiaxed structure, 5B) Located outside the main axis of the Al primary crystal of the equiaxed structure
- tissues other than the Al primary crystal to perform is shown.
- “-” indicates that the value was below the measurement limit value, and was handled as “0% by mass”.
- the plating layer of the present invention has a small variation in the ratio of component elements in the structure of each structure, except for Si with a small absolute amount. Moreover, in the plating layer of this invention, the component element ratio of Al of a cellular dendrite Al primary crystal is lower than the center part of a micro equiaxed dendrite Al primary crystal.
- the component element ratio of the structure of the plating layer of the present invention is a mass ratio, a value obtained by dividing the difference between the maximum value and the average value of the component elements of Zn, Al, and Mg by the average value, and the maximum value of Si.
- the value should be in the following range.
- the maximum value and the average value are values calculated when the ratios of the component elements are measured at the measurement points 1A) to 5B).
- the value obtained by dividing the difference between the maximum value and the average value of the component element ratio of Zn by the average value is 20% or less (preferably 15% or less)
- the value obtained by dividing the difference between the maximum value and the average value of the Al component element ratio by the average value is 75% or less (preferably 60% or less)
- the value obtained by dividing the difference between the maximum value and the average value of the Mg component element ratio by the average value is 60% or less (preferably 30% or less) ⁇ Maximum Si component element ratio is 0.2% by mass or less
- the present inventors in the Zn-Al-Mg based plating layer, a value obtained by dividing the difference between the maximum value and the average value of the component elements of Zn, Al, Mg by the average value, and the maximum value of Si This range is also considered to contribute to the improvement and maintenance of corrosion resistance.
- the plated steel sheet of the present invention is manufactured as follows, for example. First, hot zinc containing the above component elements is plated on at least one surface of a steel plate (base plate). The hot dip galvanizing is performed, for example, by immersing the steel sheet in a hot dip galvanizing bath. Next, wiping is performed to remove excess molten zinc adhering to the steel sheet, and the basis weight of the predetermined plating layer is obtained. And the steel plate which plated hot-dip zinc is cooled, a plating component is solidified, and a plating layer is formed.
- the solidification rate of the Al primary crystal affects the generation of the cellular dendrite Al primary crystal (the transition of the Al primary crystal to the cellular dendrite Al primary crystal).
- the form is determined by the balance between the temperature gradient during solidification of the Al primary crystal and the growth rate of the Al primary crystal structure.
- the inventors have found that the formation of cellular dendrite Al primary crystals is strongly influenced by the temperature gradient, and the cellular dendrite Al primary crystals are likely to be formed under certain specific quenching conditions.
- this temperature gradient indicates a temperature gradient at the solidification interface of the Al primary crystal, and the temperature gradient is determined by the relationship between the solidification latent heat and cooling (heat removal).
- a large temperature gradient means that the heat removal is continuously greater than the solidification latent heat. That is, in order to increase the temperature gradient during cooling, the overall heat transfer coefficient [ ⁇ : W / (m 2 ⁇ K)] during cooling may be increased.
- a steel sheet plated with hot dip zinc (its surface) is heated to a temperature at which Al primary crystal starts to solidify to a temperature of 30 ° C. or more and 520 ° C. or less (temperature before starting cooling). And a temperature from that temperature to 370 ° C. at a cooling rate of 500 ° C./second or more (preferably 800 ° C./second or more and 2000 ° C./second or less), and an overall heat transfer coefficient during cooling of 1000 to 3000 W / ( It is preferable to perform cooling such that m 2 ⁇ K) (preferably 2000 to 3000 W / (m 2 ⁇ K)).
- cellular dendrite Al primary crystals are generated in the obtained plating layer, but an amorphous structure is not generated.
- an amorphous phase is formed, and the ratio of cellular dendritic Al primary crystals, micro-equal axis dendritic Al primary crystals, petal-like Al primary crystals It is not preferable that the amorphous structure does not have a specific crystal structure and the elution of the Mg component is promoted to significantly reduce the corrosion resistance.
- the overall heat transfer coefficient is the heat transfer surface (that is, the power required to change the temperature at 1 ° C.
- the fine equiaxed dendrite Al primary crystals and petal-like Al primary crystals are formed by cooling under substantially the same overall heat transfer coefficient.
- submerged cooling or the like in which a steel plate (for example, a steel plate having a thickness of 0.5 to 4 mm) is submerged in water and cooled is preferable.
- the region from transition boiling to film boiling is used for heat transfer control.
- a low water temperature for example, a low water temperature that keeps the water temperature low by circulatingly cooling the water in the water tank with a chiller
- a boiling film is destroyed to prevent heat transfer inhibition due to transition boiling.
- the method of destroying a boiling film has the method of applying a water spray to a steel plate in water, and can be implemented by making water temperature and a water flow into the operation range.
- the water temperature is preferably more than 10 ° C. and less than 95 ° C.
- the water flow preferably has a velocity component of the water flow that is perpendicular to the steel plate in the range of 1 m / s to 100 m / s.
- the overall heat transfer coefficient during submerged cooling is calculated by calculating the heat exchange rate from the physical properties such as the temperature change and specific heat of the steel plate, measured by welding and installing a thermocouple on the steel plate and heating and cooling. Based on the width and steel strip thickness, the amount of heat transferred per unit time, unit area, and unit temperature change is calculated.
- the cooling rate is calculated as a temperature difference per unit time from the steel plate temperature and time when submerged and the temperature and time when the steel plate temperature is less than 100 ° C. The time difference between the two points at the time of actual measurement was about 0.01 to 0.10 seconds.
- submerged cooling film boiling occurs during submergence in the temperature range of the present invention, and cooling is performed in a state where a stable boiling film exists between the plating layer of the steel sheet and water. That is, in submerged cooling, cooling is performed while maintaining a state where the heat removal from vaporization is large and the heat removal is continuously superior to the latent heat of solidification, and the overall heat transfer coefficient during cooling is, for example, 2000 to 3000 W / ( m 2 ⁇ K).
- the overall heat transfer coefficient at the time of air-water cooling is, for example, about 300 to 900 W / (m 2 ⁇ K), and the overall heat transfer coefficient at the time of gas cooling is, for example, about 150 to 400 W / (m 2 ⁇ K). .
- cooling with a high overall heat transfer coefficient during cooling and a large cooling rate and temperature gradient is realized, and a plated steel sheet having a plated layer having the above structure is easily obtained.
- the cooling rate and temperature gradient at the time of cooling can be obtained by measuring the surface temperature of the plated steel sheet before and after cooling and performing temperature analysis by calculation.
- the temperature of the plated steel sheet before cooling is measured at a place where the temperature of the steel plate and the plated layer of the steel sheet is substantially constant, and the surface temperature of the plated steel sheet after cooling is the cellular dendrite Al primary crystal Measure in a well-cooled place to a temperature that does not affect production. However, it may be corrected by calculation.
- the overall heat transfer coefficient can also be obtained simultaneously by unsteady heat conduction analysis calculation.
- cooling below 370 degreeC there is no restriction
- MgZn 2 is additionally precipitated between 370 ° C. and 336 ° C., and then the particle size of MgZn 2 increases and the corrosion resistance of the plated steel sheet decreases. there is a possibility. For this reason, it is preferable to implement the whole cooling process by the cooling of the said conditions.
- the plated steel sheet of the present invention may have an alloy layer (for example, an Fe—Al based alloy layer such as Fe 2 Al 5 layer) at the interface between the plated layer and the steel sheet. If the alloy layer is excessively produced, the corrosion resistance may be lowered and the plating adhesion may be deteriorated. For this reason, it is preferable that the plated steel sheet of the present invention does not have an alloy layer at the interface between the plating layer and the steel sheet.
- an alloy layer for example, an Fe—Al based alloy layer such as Fe 2 Al 5 layer
- plating is performed using a hot-rolled steel sheet (carbon content: 0.2 mass%) having a thickness of 0.8 mm as a plating original sheet (steel sheet to be a base material of the plated steel sheet). Carried out.
- the process before metal plating is degreasing, pickling, and annealing, and the special pretreatment which affects the effect of this invention in particular is not implemented.
- a hot-rolled steel sheet is used, but there is no particular limitation as long as the steel sheet is in a state suitable for plating, such as a cold-rolled steel sheet or an annealed cold-rolled steel sheet used for normal plating.
- the plate thickness is, for example, a steel plate having a plate thickness of 0.5 to 4 mm.
- the plate thickness is, for example, a steel plate having a plate thickness of 0.5 to 4 mm.
- it plated directly, without giving Ni plating on a steel plate.
- Ni plating is not excluded, it is not necessarily required.
- the basis weight of the plating layer was adjusted to about 140 g / m 2 per side by nitrogen wiping.
- a predetermined temperature that is, the temperature at which the Al primary crystal starts to solidify + 30 ° C. or more and 520 ° C. or less
- Rapid cooling to a temperature of less than 370 ° C. over time formed a plated layer on the steel sheet.
- No. 1-No. 21 Zn—Al—Mg plated steel sheets were obtained.
- the whole cooling process of the plating layer of a plated steel plate was implemented according to various conditions shown in Table 4.
- the column of “Al primary crystal solidification temperature” of the component (D) of the hot dip galvanizing bath indicates the solidification temperature of MgZn 2 .
- the “impurity” column indicates a part of the detected impurities.
- the notation “submersion cooling” indicates a cooling method in which the steel sheet is immersed in water at a water temperature of 35 ° C. to 45 ° C. The water temperature in submerged cooling was adjusted to a predetermined temperature by circulating water and cooling with a cooling tower and adjusting the amount of circulating water. In submerged cooling, the region from transition boiling to film boiling was used for heat transfer control.
- roll cooling + air / water cooling indicates a roll / air / water cooling method in which the steel sheet is passed between three copper roll pairs and then cooled by spraying the air / water.
- a steel plate is passed at a high speed of about 2 m / sec between three copper roll pairs cooled by internal circulating cooling water, and the plating layer and the extremely surface of the steel plate are rapidly cooled for plating. Allow the layer to solidify.
- an air nozzle is attached to the outlet side of the third copper roll pair, and air is blown to prevent the plating layer from being melted by heat from the center of the hot steel sheet. Fix it.
- strong roll cooling + air / water cooling indicates a cooling method in which the internal circulating cooling water is cooled to 5 ° C. to 10 ° C. (inlet water temperature) with a chiller to increase the cooling capacity.
- submersible cooling low water temperature, underwater spray
- the water is circulated and cooled using a chiller, the water temperature is kept at 5-10 ° C., and the circulated water is branched so that the water is 50 mm from the plate.
- submerged cooling (high water temperature)” indicates a cooling method in which the water in the aquarium is used without being cooled and is raised to 95 ° C.
- the surface temperature of the plated layer of the steel sheet before rapid cooling (indicated as “temperature before cooling” in Table 4) is the same as or higher than the bath temperature, induction heating is used. The temperature was increased.
- the structure of the plated layer of the manufactured plated steel sheet (structures other than Al primary crystals and Al primary crystals) was measured according to the method described above.
- the structure of the plated layer of the manufactured plated steel sheet is identified by analyzing the peak distribution of the X-ray diffraction spectrum using a Cu radiation source and the SEM-EDS element distribution, and the material composition of the structure other than the Al primary crystal It was confirmed.
- the element distribution of the plated layer of the manufactured plated steel sheet was measured according to the method described above, and the value obtained by dividing the difference between the maximum value and the average value of Zn, Al, Mg by the average value, and the maximum value of Si were investigated. It was.
- the JASO test is a JASO M610 salt dry / wet cycle test (corresponding to JIS H8502) defined by JASO (Japan Automobile Manufacturers Association Standard).
- Tables 3 to 6 list various conditions, various measurement results, and evaluation results for the production of plated steel sheets.
- the corrosion weight loss is not necessarily proportional to the number of cycles.
- some samples were tested at 200 cycles, but the results were equivalent.
- First Al primary crystal (cellular dendrite Al primary crystal): Cellular dendrite-like Al primary crystal with a second axis spacing of 0.5 to 2.0 ⁇ m
- Second Al primary crystal (micro equiaxed dendritic Al primary crystal)
- Fine equiaxed dendritic Al primary crystal / third Al primary crystal (petal Al primary crystal) with main axis length of 5-10 ⁇ m and second axis distance of 0.5-2.0 ⁇ m:
- the structure of the plating layer of a predetermined component has a cellular dendrite Al primary crystal with an area ratio of 30 to 70%, a micro equiaxed dendritic Al primary crystal with a total area ratio of 30 to 70%, and a petal.
- the Al primary crystal including the Al primary crystal and when the structure other than the Al primary crystal is composed of a ternary eutectic structure of Al, Zn, and Mg 2 Zn 11 , the corrosion resistance is high, and It can be seen that the corrosion resistance is stably maintained.
- the fact that the Mg 2 Si structure is not included in the present invention means that the Al primary crystal of the structure of the present invention is a cellular dendrite Al primary crystal, a micro equiaxed dendrite Al primary crystal, and a petal-like Al primary crystal. It is considered that the formation of the structure based on the conventional equilibrium state is largely due to the fact that the overall heat transfer coefficient is greatly deviated from the equilibrium state.
- resin-based paint for example, polyester resin-based, acrylic resin-based, fluororesin-based, vinyl chloride resin-based, urethane resin-based, epoxy resin-based, etc.
- roll coating for example, spray coating
- film laminating method for example, a film laminating method when laminating a resin film such as an acrylic resin film.
- the present invention can provide a Zn—Al—Mg based plated steel sheet that is excellent in corrosion resistance and stably maintains the corrosion resistance. Thereby, the spread of household appliances and building materials excellent in rust prevention is further promoted. Since this is convenient for the consumer, the industrial utility value is extremely large.
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Abstract
Description
特許文献2: 特開2003-147500号公報
特許文献3: 特開2010-100897号公報
特許文献4: 特開平10-265926号公報
特許文献5: 特開2006-283155号公報
特許文献6: 国際公開WO2007/108496号公報
特許文献7: 特開2004-68075号公報
特許文献8: 特開平10-265926号公報
特許文献9: 特開平10-226865号公報
特許文献10: 特開2002-047549号公報
特許文献11: 特開2002-047548号公報
特許文献12: 特開2002-030405号公報
さらに、特許文献3ではNiめっきを施してから柱状晶を生成させている。Niめっきが所定量よりも少ない場合には柱状晶にならないで耐食性が劣ることが記載されている。Niめっきが無い場合には特許文献1と同等の耐食性を有すると考えられる。
特許文献4においては、本発明と同様な三元共晶中のMg-Zn合金(Mg2Zn11)生成が見られるが、外観改善の手法として水または水溶液噴霧による冷却により外観改善を達成しており、耐食性に関しては記述が無いものの、冷却速度が低いことから(実施例で最大20度/秒)、一般的なMg-Zn-Al系めっき程度と考えられる。
前記めっき層の組織は、面積率が30~70%で、かつ第二軸間隔が0.5~2.0μmのセルラーデンドライト状の第1のAl初晶と、合計した面積率が30~70%であり、主軸長さが5~10μm、第二軸間隔が0.5~2.0μmの微小等軸デンドライト状の第2のAl初晶及び主軸長さが0.5~3.0μmの花弁状の第3のAl初晶と、を含むAl初晶を有し、前記Al初晶以外の組織が、AlとZnとMg2Zn11との三元共晶組織で構成されているZn-Al-Mg系めっき鋼板。
前記溶融亜鉛をめっきした鋼板を、Al初晶が凝固を開始する温度+30℃以上520℃以下の温度とし、その温度から370℃となる温度までを500℃/秒以上の冷却速度で、かつ冷却時の総括伝熱係数を1000~3000W/(m2・K)にして冷却するZn-Al-Mg系めっき鋼板の製造方法。
まず、本発明が対象とするZn-Al-Mg系めっき層の成分元素について説明する。
具体的には、めっき層は、Alを4~22質量%、Mgを1.0~6.5質量%かつ質量%でAlの1/2以下、Siを0.001~1.000質量%、並びに、残部としてZnおよび不純物を含む。但し、めっき層は、Al、MgおよびSiを上記含有量で含み、残部がZnおよび不純物からなるめっき層であることがよい。
なお、Siは、組成によりMg2Siが平衡上優先して析出する場合があるが、本発明範囲においては、Al初晶若しくはAl初晶以外の組織に固溶、又は微細に析出した状態で、めっき層に含まれる。
これら選択元素の中でも、めっき浴浸漬時に鋼板からめっき層側に溶出し、また冷却途中でも一定温度までは拡散が継続するため、めっき層と鋼板との界面近傍での組成早期安定化の点から、めっき層にFeが飽和溶解量程度存在していることが好ましい。
次に、本発明が対象とするZn-Al-Mg系めっき層(「本発明のめっき層」)の組織について説明する。
本発明のめっき層の組織において、Al初晶は、面積率が30~70%で、かつ第二軸間隔が0.5~2.0μmのセルラーデンドライト状の第1のAl初晶(以下「セルラーデンドライトAl初晶」とも称する)と、合計した面積率が30~70%であり、主軸長さが5~10μm、第二軸間隔が0.5~2.0μmの微小等軸デンドライト状の第2のAl初晶(以下「微小等軸デンドライトAl初晶」とも称する)及び主軸長さが0.5~3.0μmの花弁状の第3のAl初晶(以下「花弁状Al初晶」とも称する)と、を含む。なお、各Al初晶の面積率は、全Al初晶の体積に対する割合である。
なお、他の形状のAl初晶には、第二軸間隔が上記範囲を満たさない従来から見られる柱状組織のAl初晶、主軸長さ及び第二軸間隔が上記範囲を満たさない等軸組織のAl初晶が含まれる。
微小等軸デンドライトAl初晶は、例えば、図1に示すように、中心部から放射状に成長した主軸と、主軸から枝状に成長した第二軸とを有する構造を有している。そして、微小等軸デンドライトAl初晶の主軸長さは、中心部側の先端から他端までの長さD21を示す。また、微小等軸デンドライトAl初晶の第二軸間隔は、隣り合う第二軸の中心軸同士の間隔D22を示す。
花弁状Al初晶は、例えば、図1に示すように、中心部から放射状に成長した主軸を持つ構造を有している。花弁状Al初晶は、二次軸(2次枝)が発達していない等軸晶と考えられる。そして、花弁状Al初晶の主軸長さは、中心部側の先端から他端までの長さD31を示す。
なお、図1は、本発明のめっき層のAl初晶の形状を示す模式的な平面図である。
図3は、本発明のZn-Al-Mg系めっき層の断面を観察したSEM(Scanning Electron Microscope:走査型電子顕微鏡)写真の一例を示す。図3には、倍率1000倍のSEM写真を示す。
なお、比較例のめっき層は、本発明と同じ成分の溶融亜鉛を用いて、鋼板にめっきしてガス冷却や気水冷却等の通常の冷却方法でめっき鋼板を製造したときのめっき層である。
具体的には、後述する実施例で示すように、本発明では、比較例に比べ、耐食性(腐食減量)が明らかに優位になり、腐食減量として2/3以下の耐食性を確保できることを見出した。
また、表面に垂直な断面で見ると、第一軸(一次枝)に対して第二軸(二次枝)が垂直に発達していることが判る。一方、従来のめっき鋼板の同じ断面での組織は、第一軸(一次枝)に対して第二軸(二次枝)は直角には発達していないことが図4より判る。
セルラーデンドライトAl初晶間の偏析は、微小等軸デンドライトAl初晶及び花弁状Al初晶に比べてバラツキが小さいので、セルラーデンドライトAl初晶を所定範囲で含むと、耐食性が一段と優れたものになると考えられる。なお、微小等軸デンドライトAl初晶は、主軸(幹)があり、第二軸(一次枝)、第三軸(二次枝)が発達しているが、上面から見ると90度方向のセル状に発達することはなく、また、樹間の偏析のバラツキも大きい。花弁状Al初晶は、主軸のみがあり、第二軸、第三軸は存在していないが、上面から見ると微小等軸デンドライトAl初晶と同様に90度方向のセル状には発達しておらず、樹幹のバラツキも同じく大きい。本発明の冷却速度範囲での製造方法では、微小等軸デンドライトAl初晶と花弁状Al初晶とは明確に形態の区別及び定義が可能であるが、比較例の一部にあるような、冷却速度の低い条件の場合には、主軸はもとより、第二軸、第三軸が発達しやすくなり、この二種のAl初晶の区別が難しくなる。このため、本発明におけるAl初晶の面積率の比較においては、微小等軸デンドライトAl初晶と花弁状Al初晶とを合わせた合計の面積率を、明らかに構造の異なるセルラーデンドライトAl初晶及び他の形状のAl初晶の面積率と比較することとした。
Al初晶の面積率は、SEMを使用した1000倍の画像を各サンプルで5視野(N数=5)用いて、市販の画像解析ソフトにより、各形状のAl初晶を特定し、その面積から下記算出式により求める。
・式:セルラーデンドライトAl初晶の面積率=セルラーデンドライトAl初晶の合計面積/Al初晶の総面積×100
・式:微小等軸デンドライトAl初晶の面積率=微小等軸デンドライトAl初晶の合計面積/Al初晶の総面積×100
・式:花弁状Al初晶の面積率=花弁状Al初晶の合計面積/Al初晶の総面積×100
・式:他の形状のAl初晶の面積率=他の形状のAl初晶の合計面積/Al初晶の総面積×100
なお、各Al初晶の面積は、Al初晶が存在する領域の面積であって、Al初晶とAl初晶の樹間(軸間)に存在する共晶組織とを含む面積とする。つまり、各Al初晶の面積率は、Al初晶とAl初晶の樹間(軸間)に存在する共晶組織とを含む領域の面積率である。
本発明のめっき層の組織において、Al初晶以外の組織は、AlとZnとMg2Zn11との三元共晶組織で構成されている。但し、この三元共晶組織には、微量(5体積%以下)のMgZn2が含まれる場合もある。
なお、本発明のめっき層の組織には、Mg2Siを含まないことが好ましい。ここで、本明細書において「Mg2Siを含まない」とは、例えば、「X線回折スペクトルを測定をしたときに、ピークとして判定されない」ことを指す。具体的には、例えば、図5Aに示す測定結果(めっき層のX線回折スペクトルの強度の測定)では、最大ピークの強度35,000CPSに対し、Mg2Siピークはノイズ(約50CPS)以下であり検知できなかった。
なお、従来のめっきではMg2Siを含むことで、耐食性を向上させていたが、本発明では従来に無いめっき結晶が更に耐食性を高めているので、Mg2Siはむしろ存在しない方が耐食性に影響を及ぼすことが無いと考えられる。
更に、Mg-Si化合物に関しては、溶融亜鉛にSiを含有しているため、通常ではMg2Siが生成されるが、本発明の場合には平衡状態図からずれて化合物が生成されていると考えられるのでMg2Siが生成しない場合が多いと考えられる。
なお、X線回折スペクトルの強度は、リガク社製RINT2000を使用し、Cu(Kα)線源にて、管電圧40kV、管電流150mAの条件で測定した。
本発明のめっき層の元素分布について説明する。
本発明のZn-Al-Mg系めっき層におけるMg、Al、ZnおよびSiのそれぞれの元素分布について調べた。図7に、本発明のめっき層を表面から観察したSEM(Scanning Electron Microscope:走査型電子顕微鏡)写真と共に、EDS(Energy Dispersive X-ray Spectrometer)によるMg、Al、ZnおよびSiのそれぞれの元素分布の測定結果を示す。各元素とも、明るい方が、濃度が高い。
同様に、比較例のZn-Al-Mg系めっき層におけるMg、Al、ZnおよびSiのそれぞれの元素分布を調べた。図8に、比較例のめっき層を表面から観察したSEM写真と共に、EDSによるMg、Al、ZnおよびSiのそれぞれの元素分布の測定結果を示す。なお、比較例のめっき層は、本発明と同じ組成の溶融亜鉛を用いて、鋼板にめっきした後、ガス冷却や気水冷却等の通常の冷却方法でめっき鋼板を製造したときのめっき層である。
次に、本発明のZn-Al-Mg系めっき層における各組織の成分元素の比率(質量比)について調べた。表1に、本発明のめっき層において、1A)セルラーデンドライト構造のセルラーデンドライトAl初晶の主軸、2A)微小等軸デンドライトAl初晶の中心部、3A)微小等軸デンドライトAl初晶の主軸、4A)花弁状Al初晶、5A)Al初晶以外の組織の成分元素の比率(質量比)の測定結果を示す。
同様に、比較例のZn-Al-Mg系めっき層における各構造の組織の成分元素の比率(質量比)について調べた。表2に、比較例のめっき層において、1B)等軸組織のAl初晶の主軸、2B)等軸組織のAl初晶の中心部、3B)等軸組織のAl初晶の主軸間の根元に位置するAl初晶以外の組織、4B)等軸組織のAl初晶の主軸間の先端に位置するAl初晶以外の組織、5B)等軸組織のAl初晶の主軸間の外部に位置するAl初晶以外の組織の成分元素の比率(質量比)の測定結果を示す。
なお、表1及び表2中、「-」は、測定限界値を下回ったことを示し、「0質量%」として取り扱った。
・Znの成分元素比率の最大値と平均値との差を平均値で除した値は20%以下(好ましくは15%以下)
・Alの成分元素比率の最大値と平均値との差を平均値で除した値は75%以下(好ましくは60%以下)
・Mgの成分元素比率の最大値と平均値との差を平均値で除した値は60%以下(好ましくは30%以下)
・Siの成分元素比率の最大値は0.2質量%以下
本発明のめっき鋼板は、例えば、次のように製造する。
まず、鋼板(元板)の少なくとも片面に、上記成分元素を含む溶融亜鉛をめっきする。この溶融亜鉛のめっきは、例えば、溶融亜鉛のめっき浴に鋼板を浸漬することで実施する。次に、ワイピングを行って、鋼板に付着した過剰な溶融亜鉛を除去し、所定のめっき層の目付量とする。そして、溶融亜鉛をめっきした鋼板を冷却し、めっき成分を凝固して、めっき層を形成する。
ここで、この温度勾配とはAl初晶の凝固界面での温度勾配を示しており、温度勾配は凝固潜熱と冷却(抜熱)との関係で決まる。そして、温度勾配が大きいとは、持続的に凝固潜熱よりも大きく抜熱が勝っているという状態となっていることである。つまり、冷却時の温度勾配が大きくするには、冷媒時の総括伝熱係数[α:W/(m2・K)]を高めてやることがよい。
3000W/(m2・K)を超える総括伝熱係数の冷却方式で冷却を実施すると、アモルファス相が生成し、セルラーデンドライトAl初晶、微小等軸デンドライトAl初晶、花弁状Al初晶の比率が低くなることはもとより、アモルファス構造が特定の結晶構造を持たず、Mg成分の溶出が促進することで、耐食性が著しく低下してしまうため、好ましくない。
なお、総括伝熱係数とは、伝熱面(つまり、溶融亜鉛をめっきした鋼板のめっき層の表面の単位面積当たり1℃温度を変化させるのに要する仕事率(W/(m2・K))を意味する。
また、微細等軸デンドライトAl初晶及び花弁状Al初晶も略同じ総括伝熱係数下での冷却により形成されていると考えられる。
表3及び表4に示す各種条件に従って、めっきの原板(めっき鋼板の母材となる鋼板)として、板厚0.8mmの熱延鋼板(炭素含有量:0.2質量%)を用いてめっきを実施した。なお、めっき前の処理は、脱脂、酸洗、焼鈍であり、特に本発明の効果に影響する特別な前処理は実施していない。実施例では熱延鋼板を使用したが、通常のめっきに使用する、冷延鋼板、焼鈍済み冷延鋼板等、めっきに適する状態の鋼板であれば特段の制約は無い。また板厚は、例えば板厚0.5~4mmの鋼板であれば、問題ない。また、実施例では、鋼板の上にNiめっきは施さないで直接めっきした。ただし、Niめっきする事は排除する訳では無いが、格段必要な訳では無い。
また、表4中、冷却方法の欄において、「水没冷却」との表記は、水温35℃から45℃の水中に鋼板を浸漬する冷却方法を示している。水没冷却での水温は、水を循環させて、クーリングタワーにて冷却し、循環水量を調整して所定温度とした。水没冷却では、伝熱制御のために遷移沸騰から膜沸騰の領域を用いた。
「ロール冷却+気水冷却」との表記は、鋼板を3つの銅製ロール対間に通板した後、気水を吹き付けて冷却するロール/気水冷却方法を示している。ロール/気水冷却方法では、内部循環冷却水により水冷した3つの銅製ロール対間に、2m/秒程度の高速で鋼板を通板して、めっき層と鋼板の極く表面を急冷してめっき層を凝固させる。さらに3つ目の銅製ロール対の出口側に気水ノズルを取り付けて、気水を吹き付け、高温の鋼板中心部からの熱でめっき層が最溶融することを防いで、めっき層の凝固成分を固定する。
「ロール強冷却+気水冷却」との表記は、内部循環冷却水をチラーにて5℃~10℃(入側水温)に冷やし、冷却能力を高めた冷却方法を示している。
「水没冷却(低水温、水中スプレー)」との表記は、チラーを使用して循環冷却し、水温を5~10℃に保ち、かつその循環水を分岐して、水中で、板から50mmの距離、1本あたり20L/minで表裏15本ずつのノズルから垂直に水流をあてる冷却方法を示している。
「水没冷却(高水温)」との表記は、水槽の水を冷却しないまま使用し、95℃まで上昇する冷却方法を示している。
製造しためっき鋼板のめっき層の組織(Al初晶、Al初晶以外の組織)について、既述の方法に従って測定した。
また、製造しためっき鋼板のめっき層の組織について、Cu線源を用いたX線回折スペクトルのピーク分布、及びSEM-EDS元素分布を解析することで特定し、Al初晶以外の組織の物質構成を確認した。
また、製造しためっき鋼板のめっき層の元素分布について、既述の方法に従って測定し、Zn、Al、Mgの最大値と平均値との差を平均値で除した値、Siの最大値を調べた。
耐食性の評価としては、冷却後のめっき鋼板のめっき層からサンプリングして、5%-NaClを用いた乾湿複合サイクル試験(JASO試験)で行い、60サイクル後のめっき腐食減量を調査した。この結果を以下のように評価した。
なお、JASO試験とは、JASO(日本自動車技術会規格)で定められたJASO M610塩乾湿サイクル試験(JIS H 8502に相当)のことである。
○:腐食減量≦20g/m2
△:20g/m2<腐食減量≦25g/m2
×:25g/m2<腐食減量
・第1のAl初晶(セルラーデンドライトAl初晶): 第二軸間隔が0.5~2.0μmのセルラーデンドライト状のAl初晶
・第2のAl初晶(微小等軸デンドライトAl初晶): 主軸長さが5~10μm、第二軸間隔が0.5~2.0μmの微小等軸デンドライト状のAl初晶
・第3のAl初晶(花弁状Al初晶): 主軸長さが0.5~3.0μmの半弁状のAl初晶
・他の形状のAl初晶: 上記セルラーデンドライトAl初晶、微小等軸デンドライト初晶及び花弁状Al初晶以外のAl初晶
なお、No.1~No.5、No.11のめっき鋼板のめっき層では、他の形状のAl初晶として、ブロック状のAl初晶が観察された。また、めっき層には、Mg2Siが含まれていないことが確認された。
また、本発明は、めっき鋼板の作製において、めっき後の後処理を実施しても、耐食性に優れ、その耐食性が安定的に維持されるという効果が同様に奏される。さらに、本発明は、めっき鋼鈑に、プレス成形等の加工を施した後でも、めっき鋼鈑のめっき層が微細かつ均質に近い構造を維持するため、パウダリング等は起こりにくく、耐食性が低下しない。
Claims (5)
- Alを4~22質量%、Mgを1.0~6.5質量%かつ質量%でAlの1/2以下、Siを0.001~1.000質量%、並びに、残部としてZnおよび不純物を含むめっき層を有し、
前記めっき層の組織は、面積率が30~70%で、かつ第二軸間隔が0.5~2.0μmのセルラーデンドライト状の第1のAl初晶と、合計した面積率が30~70%であり、主軸長さが5~10μm、第二軸間隔が0.5~2.0μmの微小等軸デンドライト状の第2のAl初晶及び主軸長さが0.5~3.0μmの花弁状の第3のAl初晶と、を含むAl初晶を有し、前記Al初晶以外の組織が、AlとZnとMg2Zn11との三元共晶組織で構成されているZn-Al-Mg系めっき鋼板。 - 前記めっき層が、更に、Ti、Nb、Fe、Ni、Cr、Sn、Mn、およびBから選ばれる1種若しくは2種以上を、単独又は複合で、0.0001~1.0000質量%含有する請求項1に記載のZn-Al-Mg系めっき鋼板。
- 前記めっき層の組織が、Mg2Siを含まない請求項1又は請求項2に記載のZn-Al-Mg系めっき鋼板。
- Alを4~22質量%、Mgを1.0~6.5質量%かつ質量%でAlの1/2以下、Siを0.001~1.000質量%、並びに、残部としてZnおよび不純物を含む溶融亜鉛を、鋼板の少なくとも片面にめっきし、
前記溶融亜鉛をめっきした鋼板を、Al初晶が凝固を開始する温度+30℃以上520℃以下の温度とし、その温度から370℃となる温度までを500℃/秒以上の冷却速度で、かつ冷却時の総括伝熱係数を1000~3000W/(m2・K)にして冷却するZn-Al-Mg系めっき鋼板の製造方法。 - 前記冷却を、水没冷却で行う請求項4に記載のZn-Al-Mg系めっき鋼板の製造方法。
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JP2021085088A (ja) * | 2019-11-29 | 2021-06-03 | 日本製鉄株式会社 | Zn−Al−Mg系溶融めっき鋼板 |
WO2021106260A1 (ja) * | 2019-11-29 | 2021-06-03 | 日本製鉄株式会社 | Zn-Al-Mg系溶融めっき鋼板 |
JP7381864B2 (ja) | 2019-11-29 | 2023-11-16 | 日本製鉄株式会社 | Zn-Al-Mg系溶融めっき鋼板 |
JP7381865B2 (ja) | 2019-11-29 | 2023-11-16 | 日本製鉄株式会社 | Zn-Al-Mg系溶融めっき鋼板 |
JP7464849B2 (ja) | 2020-10-21 | 2024-04-10 | 日本製鉄株式会社 | めっき鋼材、およびめっき鋼材の製造方法 |
JP7040695B1 (ja) * | 2020-11-18 | 2022-03-23 | 日本製鉄株式会社 | めっき鋼材 |
WO2022107837A1 (ja) * | 2020-11-18 | 2022-05-27 | 日本製鉄株式会社 | めっき鋼材 |
US11851764B2 (en) | 2020-11-18 | 2023-12-26 | Nippon Steel Corporation | Plated steel material |
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US20180237897A1 (en) | 2018-08-23 |
CN107429375B (zh) | 2018-09-21 |
CA2979169C (en) | 2018-01-02 |
JPWO2016162982A1 (ja) | 2017-04-27 |
CN107429375A (zh) | 2017-12-01 |
KR20170105092A (ko) | 2017-09-18 |
AU2015390616A1 (en) | 2017-09-07 |
US10472710B2 (en) | 2019-11-12 |
KR101896857B1 (ko) | 2018-09-07 |
AU2015390616B2 (en) | 2017-12-14 |
CA2979169A1 (en) | 2016-10-13 |
MY165610A (en) | 2018-04-16 |
MX2017011746A (es) | 2017-11-13 |
JP6070915B1 (ja) | 2017-02-01 |
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