JP2019501296A - 耐摩擦性及び耐白錆性に優れためっき鋼材及びその製造方法 - Google Patents
耐摩擦性及び耐白錆性に優れためっき鋼材及びその製造方法 Download PDFInfo
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- 238000007747 plating Methods 0.000 title claims abstract description 126
- 229910000831 Steel Inorganic materials 0.000 title claims abstract description 100
- 239000010959 steel Substances 0.000 title claims abstract description 100
- 239000000463 material Substances 0.000 title claims abstract description 94
- 238000004519 manufacturing process Methods 0.000 title claims description 19
- 241001163841 Albugo ipomoeae-panduratae Species 0.000 title description 13
- 229910052749 magnesium Inorganic materials 0.000 claims abstract description 30
- 239000012535 impurity Substances 0.000 claims abstract description 13
- 239000011777 magnesium Substances 0.000 claims description 105
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 claims description 44
- 238000001816 cooling Methods 0.000 claims description 43
- 229910052742 iron Inorganic materials 0.000 claims description 24
- 238000000034 method Methods 0.000 claims description 18
- FYYHWMGAXLPEAU-UHFFFAOYSA-N Magnesium Chemical compound [Mg] FYYHWMGAXLPEAU-UHFFFAOYSA-N 0.000 claims description 13
- 229910018134 Al-Mg Inorganic materials 0.000 claims description 12
- 229910018467 Al—Mg Inorganic materials 0.000 claims description 12
- 229910000765 intermetallic Inorganic materials 0.000 claims description 11
- 229910019142 PO4 Inorganic materials 0.000 claims description 10
- 239000007864 aqueous solution Substances 0.000 claims description 10
- NBIIXXVUZAFLBC-UHFFFAOYSA-K phosphate Chemical compound [O-]P([O-])([O-])=O NBIIXXVUZAFLBC-UHFFFAOYSA-K 0.000 claims description 10
- 239000010452 phosphate Substances 0.000 claims description 10
- 229910052782 aluminium Inorganic materials 0.000 claims description 7
- 229910017706 MgZn Inorganic materials 0.000 claims description 6
- 230000005496 eutectics Effects 0.000 claims description 6
- 229910007570 Zn-Al Inorganic materials 0.000 claims description 2
- GVALZJMUIHGIMD-UHFFFAOYSA-H magnesium phosphate Chemical compound [Mg+2].[Mg+2].[Mg+2].[O-]P([O-])([O-])=O.[O-]P([O-])([O-])=O GVALZJMUIHGIMD-UHFFFAOYSA-H 0.000 claims description 2
- 229960002261 magnesium phosphate Drugs 0.000 claims description 2
- 229910000157 magnesium phosphate Inorganic materials 0.000 claims description 2
- 239000004137 magnesium phosphate Substances 0.000 claims description 2
- 235000010994 magnesium phosphates Nutrition 0.000 claims description 2
- 238000002791 soaking Methods 0.000 claims 2
- 229910045601 alloy Inorganic materials 0.000 claims 1
- 239000000956 alloy Substances 0.000 claims 1
- 239000011248 coating agent Substances 0.000 claims 1
- 238000000576 coating method Methods 0.000 claims 1
- 239000010410 layer Substances 0.000 description 67
- 239000011701 zinc Substances 0.000 description 34
- 239000012071 phase Substances 0.000 description 13
- 230000007797 corrosion Effects 0.000 description 12
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- 238000007711 solidification Methods 0.000 description 7
- 230000008023 solidification Effects 0.000 description 7
- 238000009826 distribution Methods 0.000 description 5
- 230000007547 defect Effects 0.000 description 4
- 239000007789 gas Substances 0.000 description 4
- 229920006395 saturated elastomer Polymers 0.000 description 4
- 229910001335 Galvanized steel Inorganic materials 0.000 description 3
- HCHKCACWOHOZIP-UHFFFAOYSA-N Zinc Chemical compound [Zn] HCHKCACWOHOZIP-UHFFFAOYSA-N 0.000 description 3
- 230000000052 comparative effect Effects 0.000 description 3
- 238000007598 dipping method Methods 0.000 description 3
- 238000002149 energy-dispersive X-ray emission spectroscopy Methods 0.000 description 3
- 239000008397 galvanized steel Substances 0.000 description 3
- 239000007791 liquid phase Substances 0.000 description 3
- 238000012423 maintenance Methods 0.000 description 3
- 238000005259 measurement Methods 0.000 description 3
- 150000003839 salts Chemical class 0.000 description 3
- 238000012360 testing method Methods 0.000 description 3
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- CSCPPACGZOOCGX-UHFFFAOYSA-N Acetone Chemical compound CC(C)=O CSCPPACGZOOCGX-UHFFFAOYSA-N 0.000 description 2
- XKRFYHLGVUSROY-UHFFFAOYSA-N Argon Chemical compound [Ar] XKRFYHLGVUSROY-UHFFFAOYSA-N 0.000 description 2
- 229910001297 Zn alloy Inorganic materials 0.000 description 2
- 238000005452 bending Methods 0.000 description 2
- 230000015572 biosynthetic process Effects 0.000 description 2
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- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 2
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 description 1
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 1
- 229920000298 Cellophane Polymers 0.000 description 1
- 229910017813 Cu—Cr Inorganic materials 0.000 description 1
- 239000002390 adhesive tape Substances 0.000 description 1
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- 238000003915 air pollution Methods 0.000 description 1
- 229910000905 alloy phase Inorganic materials 0.000 description 1
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 1
- 238000004458 analytical method Methods 0.000 description 1
- 229910052786 argon Inorganic materials 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 239000004566 building material Substances 0.000 description 1
- 229910052799 carbon Inorganic materials 0.000 description 1
- 238000004210 cathodic protection Methods 0.000 description 1
- 239000010960 cold rolled steel Substances 0.000 description 1
- 238000010924 continuous production Methods 0.000 description 1
- 238000011161 development Methods 0.000 description 1
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- JEIPFZHSYJVQDO-UHFFFAOYSA-N iron(III) oxide Inorganic materials O=[Fe]O[Fe]=O JEIPFZHSYJVQDO-UHFFFAOYSA-N 0.000 description 1
- 229910001338 liquidmetal Inorganic materials 0.000 description 1
- 238000000691 measurement method Methods 0.000 description 1
- 230000003287 optical effect Effects 0.000 description 1
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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
- B32B15/01—Layered products comprising a layer of metal all layers being exclusively metallic
- B32B15/013—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 a metal other than iron or aluminium
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C18/00—Alloys based on zinc
- C22C18/04—Alloys based on zinc with aluminium as the next major constituent
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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
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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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- 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
- C23C2/12—Aluminium or alloys based thereon
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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
- C23C2/14—Removing excess of molten coatings; Controlling or regulating the coating thickness
- C23C2/16—Removing excess of molten coatings; Controlling or regulating the coating thickness using fluids under pressure, e.g. air knives
- C23C2/18—Removing excess of molten coatings from elongated material
- C23C2/20—Strips; Plates
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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
- C23C2/26—After-treatment
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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
- C23C2/26—After-treatment
- C23C2/28—Thermal after-treatment, e.g. treatment in oil bath
- C23C2/29—Cooling or quenching
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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
- C23C2/34—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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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
- Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
- Y10T428/00—Stock material or miscellaneous articles
- Y10T428/12—All metal or with adjacent metals
- Y10T428/12493—Composite; i.e., plural, adjacent, spatially distinct metal components [e.g., layers, joint, etc.]
- Y10T428/12736—Al-base component
- Y10T428/1275—Next to Group VIII or IB metal-base component
- Y10T428/12757—Fe
Abstract
Description
([Mg]S−[Mg]1/2)/[Mg]1/2≧0.3 [数式(1)]
(ここで、[Mg]Sは、めっき層の表面でのMgの濃度(重量%)を意味し、[Mg]1/2は、めっき層の表面から厚さ方向に1/2t(tはめっき層の厚さ、以下、同様)位置でのMgの濃度(重量%)を意味する。)
([Mg]S−[Mg]1/2)/[Mg]1/2≧0.3 [数式(1)]
上記数式1において、[Mg]Sは、めっき層の表面でのMgの含量(重量%)を意味し、[Mg]1/2は、めっき層の表面から厚さ方向に1/2t(tはめっき層の厚さ、以下、同様)位置でのMgの含量(重量%)を意味する。
めっき付着量が調節されためっき鋼材にマグネシウム系リン酸塩水溶液の液滴を噴射して冷却する。このようにマグネシウム系リン酸塩水溶液の液滴噴射による冷却を行う場合、マグネシウムのめっき層の表面濃化率の向上に寄与するだけでなく、吸熱反応により溶融状態のめっき層を急速冷却させることで、Zn単相組織中に固溶されたMgの含量の低減にも寄与する。ここで、マグネシウム系リン酸塩水溶液は、例えば、Mg3(PO4)2であることができる。
めっき付着量が調節されためっき鋼材を1次冷却する。本段階は、Znが素地鉄とめっき層との界面付近で凝固されるように誘導するために行われる段階である。
摩擦特性試験(linear friction test)のために、ツールヘッドで製造されたそれぞれのめっき鋼材の表面に一定の圧力を加えた状態で全20回の摩擦を加えた。このとき、目標荷重は333.3kgfであり、圧力は3.736MPaであり、1回摩擦のときのツールヘッドの移動距離は200mmであり、ツールヘッドの移動速度は20mm/sであった。
それぞれのめっき鋼材を塩水噴霧試験機に装入し、国際規格(ASTM B117−11)に準じて赤錆発生時間を測定した。このとき、5%の塩水(温度35、pH6.8)を使用し、時間当たり2ml/80cm2の塩水を噴霧した。72時間経過後に形成される白清の面積を画像解析器を用いて分析し、5%以下である場合を「◎」、10%以下である場合を「○」、10%を超える場合を「X」と評価した。
先端径6mmのCu−Cr電極を用いて溶接電流7kAを流しながら、加圧力2.1kNで11サイクル(ここで、1サイクルは1/60秒を意味する、以下、同様)の通電時間と11サイクルの保持時間の条件で連続して溶接を行った。鋼板の厚さをtとしたときに、ナゲット径が4vtより小さくなる打点を基準としてその直前までの打点数を連続打点数と決定した。ここで、連続打点数が大きければ大きいほど、スポット溶接性が優れていることを意味している。連続打点数が700打点以上である場合を「◎」、500打点以上である場合を「○」、500打点未満である場合を「X」と評価した。
Claims (17)
- 重量%で、Al:0.5〜14%、Mg:0.5〜5%、残部Zn及び不可避不純物を含むめっき層を有するめっき鋼材であって、下記数式1を満たす、めっき鋼材。
([Mg]S−[Mg]1/2)/[Mg]1/2≧0.3 [数式(1)](ここで、[Mg]Sは、めっき層の表面でのMgの含量(重量%)を意味し、[Mg]1/2は、めっき層の表面から厚さ方向に1/2t(tはめっき層の厚さ、以下、同様)位置でのMgの含量(重量%)を意味する。) - 重量%で、Al:0.5〜14%、Mg:0.5〜5%、残部Zn及び不可避不純物を含むめっき層を有するめっき鋼材であって、
前記めっき層に含まれたMgの平均含量(C0、重量%)に対する、前記めっき層の表面から厚さ方向に1/7t位置までの領域に含まれたMgの含量(C1、重量%)の比(C1/C0)が1.02以上である、めっき鋼材。 - 前記めっき層は、その微細組織として、Zn単相組織と、Zn−Al−Mg系金属間化合物と、を含む、請求項1または2に記載のめっき鋼材。
- 前記Zn−Al−Mg系金属間化合物は、Zn/Al/MgZn2の三元共晶組織、Zn/MgZn2の二元共晶組織、Zn−Alの二元共晶組織、及びMgZn2の単相組織からなる群から選択される1種以上である、請求項3に記載のめっき鋼材。
- 前記Zn単相組織は、0.03重量%以下(0重量%を含む)のMgを含む、請求項3に記載のめっき鋼材。
- 前記めっき層は、重量%で、Al:1〜11%、Mg:1〜3%、残部Zn及び不可避不純物を含む、請求項1または2に記載のめっき鋼材。
- 前記めっき層の表面摩擦係数が0.15以下である、請求項1または2に記載のめっき鋼材。
- 重量%で、Al:0.5〜14%、Mg:0.5〜5%、残部Zn及び不可避不純物を含むめっき浴を準備する段階と、
前記めっき浴に素地鉄を浸漬し、めっきを行ってめっき鋼材を得る段階と、
前記めっき鋼材のめっき付着量を調節する段階と、
前記めっき付着量が調節されためっき鋼材にマグネシウム系リン酸塩水溶液の液滴を噴射して冷却する段階と、を含む、めっき鋼材の製造方法。 - 前記液滴噴射開始温度が405〜425℃である、請求項8に記載のめっき鋼材の製造方法。
- 前記液滴噴射において、前記液滴がめっき鋼材との静電引力によって付着されるように帯電噴射する、請求項8に記載のめっき鋼材の製造方法。
- 前記液滴噴射において、液滴の噴射量が50〜100g/m2である、請求項8に記載のめっき鋼材の製造方法。
- 前記マグネシウム系リン酸塩水溶液がMg3(PO4)2である、請求項8に記載のめっき鋼材の製造方法。
- 前記マグネシウム系リン酸塩水溶液の濃度が1〜3重量%である、請求項8に記載のめっき鋼材の製造方法。
- 重量%で、Al:0.5〜14%、Mg:0.5〜5%、残部Zn及び不可避不純物を含むめっき浴を準備する段階と、
前記めっき浴に素地鉄を浸漬し、めっきを行ってめっき鋼材を得る段階と、
前記めっき鋼材のめっき付着量を調節する段階と、
前記めっき付着量が調節されためっき鋼材を、5℃/s以下(0℃/sを除く)の1次冷却速度で380℃超過420℃以下の1次冷却終了温度まで1次冷却する段階と、
前記1次冷却されためっき鋼材を前記1次冷却終了温度で1秒以上恒温維持する段階と、
前記恒温維持されためっき鋼材を、10℃/s以上の2次冷却速度で320℃以下の2次冷却終了温度まで2次冷却する段階と、を含む、めっき鋼材の製造方法。 - 前記めっき浴の温度が440〜460℃である、請求項8または14に記載のめっき鋼材の製造方法。
- 前記めっき浴の温度をT1(℃)とし、前記めっき浴に引き込まれる素地鉄の表面温度をT2(℃)としたときに、前記T1に対するT2の比(T2/T1)が1.10以下である、請求項8または14に記載のめっき鋼材の製造方法。
- 前記めっき浴は、重量%で、Al:1〜11%、Mg:1〜3%、残部Zn及び不可避不純物を含む、請求項8または14に記載のめっき鋼材の製造方法。
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