JP2021508777A - 表面品質及び耐食性に優れた亜鉛合金めっき鋼材及びその製造方法 - Google Patents
表面品質及び耐食性に優れた亜鉛合金めっき鋼材及びその製造方法 Download PDFInfo
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- JP2021508777A JP2021508777A JP2020535192A JP2020535192A JP2021508777A JP 2021508777 A JP2021508777 A JP 2021508777A JP 2020535192 A JP2020535192 A JP 2020535192A JP 2020535192 A JP2020535192 A JP 2020535192A JP 2021508777 A JP2021508777 A JP 2021508777A
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- zinc alloy
- steel material
- plating
- phase
- layer
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- 229910000831 Steel Inorganic materials 0.000 title claims abstract description 150
- 239000010959 steel Substances 0.000 title claims abstract description 150
- 229910001297 Zn alloy Inorganic materials 0.000 title claims abstract description 83
- 230000007797 corrosion Effects 0.000 title claims abstract description 80
- 238000005260 corrosion Methods 0.000 title claims abstract description 80
- 238000004519 manufacturing process Methods 0.000 title claims abstract description 34
- 239000000463 material Substances 0.000 claims abstract description 127
- 238000007747 plating Methods 0.000 claims description 244
- 239000010410 layer Substances 0.000 claims description 239
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 claims description 165
- 239000011701 zinc Substances 0.000 claims description 92
- 229910052742 iron Inorganic materials 0.000 claims description 81
- 230000001629 suppression Effects 0.000 claims description 49
- 238000000034 method Methods 0.000 claims description 37
- 229910017706 MgZn Inorganic materials 0.000 claims description 35
- 238000001816 cooling Methods 0.000 claims description 28
- 229910052725 zinc Inorganic materials 0.000 claims description 27
- 229910002058 ternary alloy Inorganic materials 0.000 claims description 26
- 239000013078 crystal Substances 0.000 claims description 23
- 238000007711 solidification Methods 0.000 claims description 18
- 230000008023 solidification Effects 0.000 claims description 18
- HCHKCACWOHOZIP-UHFFFAOYSA-N Zinc Chemical compound [Zn] HCHKCACWOHOZIP-UHFFFAOYSA-N 0.000 claims description 17
- 229910052782 aluminium Inorganic materials 0.000 claims description 17
- 229910052749 magnesium Inorganic materials 0.000 claims description 17
- 230000003746 surface roughness Effects 0.000 claims description 15
- 229910000765 intermetallic Inorganic materials 0.000 claims description 13
- 239000012535 impurity Substances 0.000 claims description 10
- 239000010960 cold rolled steel Substances 0.000 claims description 9
- 239000000203 mixture Substances 0.000 claims description 5
- 239000002344 surface layer Substances 0.000 claims description 5
- 230000002401 inhibitory effect Effects 0.000 claims description 3
- 239000004566 building material Substances 0.000 abstract description 5
- 239000012071 phase Substances 0.000 description 102
- 239000011777 magnesium Substances 0.000 description 40
- 229910001335 Galvanized steel Inorganic materials 0.000 description 14
- 230000000694 effects Effects 0.000 description 14
- 239000008397 galvanized steel Substances 0.000 description 14
- 229910018134 Al-Mg Inorganic materials 0.000 description 12
- 229910018467 Al—Mg Inorganic materials 0.000 description 12
- 230000005764 inhibitory process Effects 0.000 description 12
- 230000002829 reductive effect Effects 0.000 description 12
- 238000005452 bending Methods 0.000 description 10
- 230000015572 biosynthetic process Effects 0.000 description 10
- 238000005097 cold rolling Methods 0.000 description 10
- 238000002845 discoloration Methods 0.000 description 8
- 239000007789 gas Substances 0.000 description 8
- 238000005096 rolling process Methods 0.000 description 8
- 229910000905 alloy phase Inorganic materials 0.000 description 6
- 238000005246 galvanizing Methods 0.000 description 6
- 235000019589 hardness Nutrition 0.000 description 6
- 238000005098 hot rolling Methods 0.000 description 6
- 239000001257 hydrogen Substances 0.000 description 6
- 229910052739 hydrogen Inorganic materials 0.000 description 6
- 230000003647 oxidation Effects 0.000 description 6
- 238000007254 oxidation reaction Methods 0.000 description 6
- UFHFLCQGNIYNRP-UHFFFAOYSA-N Hydrogen Chemical compound [H][H] UFHFLCQGNIYNRP-UHFFFAOYSA-N 0.000 description 4
- FYYHWMGAXLPEAU-UHFFFAOYSA-N Magnesium Chemical compound [Mg] FYYHWMGAXLPEAU-UHFFFAOYSA-N 0.000 description 4
- 229910045601 alloy Inorganic materials 0.000 description 4
- 239000000956 alloy Substances 0.000 description 4
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 4
- 238000000137 annealing Methods 0.000 description 4
- 230000000052 comparative effect Effects 0.000 description 4
- 230000007423 decrease Effects 0.000 description 4
- 230000007547 defect Effects 0.000 description 4
- 230000006355 external stress Effects 0.000 description 4
- 238000002347 injection Methods 0.000 description 4
- 239000007924 injection Substances 0.000 description 4
- JEIPFZHSYJVQDO-UHFFFAOYSA-N iron(III) oxide Inorganic materials O=[Fe]O[Fe]=O JEIPFZHSYJVQDO-UHFFFAOYSA-N 0.000 description 4
- 239000007791 liquid phase Substances 0.000 description 4
- 239000011573 trace mineral Substances 0.000 description 4
- 235000013619 trace mineral Nutrition 0.000 description 4
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 description 2
- 241000446313 Lamella Species 0.000 description 2
- 229910019142 PO4 Inorganic materials 0.000 description 2
- 229910007570 Zn-Al Inorganic materials 0.000 description 2
- 230000002411 adverse Effects 0.000 description 2
- 238000003915 air pollution Methods 0.000 description 2
- 239000007864 aqueous solution Substances 0.000 description 2
- 230000033228 biological regulation Effects 0.000 description 2
- 230000005540 biological transmission Effects 0.000 description 2
- 238000004210 cathodic protection Methods 0.000 description 2
- 238000006243 chemical reaction Methods 0.000 description 2
- 238000005520 cutting process Methods 0.000 description 2
- 125000004122 cyclic group Chemical group 0.000 description 2
- 230000003247 decreasing effect Effects 0.000 description 2
- 230000006866 deterioration Effects 0.000 description 2
- 238000009792 diffusion process Methods 0.000 description 2
- 239000003344 environmental pollutant Substances 0.000 description 2
- 239000006023 eutectic alloy Substances 0.000 description 2
- IXCSERBJSXMMFS-UHFFFAOYSA-N hcl hcl Chemical compound Cl.Cl IXCSERBJSXMMFS-UHFFFAOYSA-N 0.000 description 2
- 238000000265 homogenisation Methods 0.000 description 2
- 150000002431 hydrogen Chemical class 0.000 description 2
- 239000011261 inert gas Substances 0.000 description 2
- 230000000670 limiting effect Effects 0.000 description 2
- 230000007774 longterm Effects 0.000 description 2
- 229910052751 metal Inorganic materials 0.000 description 2
- 239000002184 metal Substances 0.000 description 2
- 230000033116 oxidation-reduction process Effects 0.000 description 2
- 230000001590 oxidative effect Effects 0.000 description 2
- 238000002161 passivation Methods 0.000 description 2
- NBIIXXVUZAFLBC-UHFFFAOYSA-K phosphate Chemical compound [O-]P([O-])([O-])=O NBIIXXVUZAFLBC-UHFFFAOYSA-K 0.000 description 2
- 239000010452 phosphate Substances 0.000 description 2
- 238000009832 plasma treatment Methods 0.000 description 2
- 231100000719 pollutant Toxicity 0.000 description 2
- 239000002994 raw material Substances 0.000 description 2
- 230000000452 restraining effect Effects 0.000 description 2
- 150000003839 salts Chemical class 0.000 description 2
- 238000003860 storage Methods 0.000 description 2
- 239000000126 substance Substances 0.000 description 2
- JBQYATWDVHIOAR-UHFFFAOYSA-N tellanylidenegermanium Chemical compound [Te]=[Ge] JBQYATWDVHIOAR-UHFFFAOYSA-N 0.000 description 2
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 2
- 238000004804 winding Methods 0.000 description 2
- UGZADUVQMDAIAO-UHFFFAOYSA-L zinc hydroxide Chemical compound [OH-].[OH-].[Zn+2] UGZADUVQMDAIAO-UHFFFAOYSA-L 0.000 description 2
- 229940007718 zinc hydroxide Drugs 0.000 description 2
- 229910021511 zinc hydroxide Inorganic materials 0.000 description 2
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Abstract
Description
[関係式1]
0.7Vc≦Vc’≦1.5Vc
但し、Vcはワイピング直後のめっき層凝固完了までの冷却速度であり、Vc’はワイピング直後のめっき層凝固開始までの冷却速度である。
[関係式2]
[関係式1]
0.7Vc≦Vc’≦1.5Vc
但し、Vcはワイピング直後のめっき層凝固完了までの平均冷却速度であり、Vc’はワイピング直後のめっき層凝固開始までの平均冷却速度である。
ここで、好ましい組織を得るために、液相状態でめっき層の厚さを調整した後、凝固が完了した時点の平均冷却速度(Vc)に対する、液相状態でめっき層の厚さを調整した後、凝固が開始する地点の平均冷却速度(Vc’)の割合(Vc’/Vc)は0.7〜1.5であることが好ましい。これは、めっき層内の相の構造及び成長に影響を与える要因として作用することができる。
素地鉄として0.03%C−0.2%Si−0.15%Mn−0.01%P−0.01%Sを含む厚さ0.8mmの冷延鋼板で自動車外板用素地鋼板を設ける。この際、素地鋼板の表面粗さ(Ra)及び急峻度は下記表1に示したとおりである。上記冷延鋼板コイルを連続的にZn−Al−Mg合金めっき浴に浸漬して引き出した後、ワイピング工程及び冷却を経て亜鉛合金めっき鋼板を製造した。具体的な条件は下記表1に示したとおりである。
[関係式1]
0.7Vc≦Vc’≦1.5Vc
但し、Vcはワイピング直後のめっき層凝固完了までの冷却速度であり、Vc’はワイピング直後のめっき層凝固開始までの冷却速度である。
[関係式2]
[関係式1]
0.7Vc≦Vc’≦1.5Vc
但し、Vcはワイピング直後のめっき層凝固完了までの平均冷却速度であり、Vc’はワイピング直後のめっき層凝固開始までの平均冷却速度である。
ここで、好ましい組織を得るために、液相状態でめっき層の厚さを調整した後、凝固が完了した時点の平均冷却速度(Vc)に対する、液相状態でめっき層の厚さを調整した後、凝固が開始する地点の平均冷却速度(Vc’)の割合(Vc’/Vc)は0.7〜1.5であることが好ましい。これは、めっき層内の相の構造及び成長に影響を与える要因として作用することができる。
素地鉄として0.03%C−0.2%Si−0.15%Mn−0.01%P−0.01%Sを含む厚さ0.8mmの冷延鋼板で自動車外板用素地鋼板を設ける。この際、素地鋼板の表面粗さ(Ra)及び急峻度は下記表1に示したとおりである。上記冷延鋼板コイルを連続的にZn−Al−Mg合金めっき浴に浸漬して引き出した後、ワイピング工程及び冷却を経て亜鉛合金めっき鋼板を製造した。具体的な条件は下記表1に示したとおりである。
Claims (10)
- 素地鉄と、
前記素地鉄上に形成された亜鉛合金めっき層と、
前記素地鉄と前記亜鉛合金めっき層の間に形成された抑制層と、を含み、
前記亜鉛合金めっき層の表面のZn相は面積分率で15〜90%含み、
前記抑制層上に2μm以下の厚さで形成されたZn/MgZn2/Alの3元合金相層を含み、前記3元合金相層は、前記抑制層の表面を30〜90%の面積分率で覆う、表面品質及び耐食性に優れた亜鉛合金めっき鋼材。 - 前記亜鉛合金めっき層は、Zn相及びMgZn2相のラメラ構造を含み、前記Zn相及びMgZn2相の幅方向の平均厚さはそれぞれ1.5μm以下である、請求項1に記載の表面品質及び耐食性に優れた亜鉛合金めっき鋼材。
- 前記抑制層のFe−Al系金属間化合物の結晶粒サイズは300nm以下である、請求項1に記載の表面品質及び耐食性に優れた亜鉛合金めっき鋼材。
- 前記亜鉛合金めっき層は、重量%で、Mg:0.5〜3.5%、Al:0.5〜20.0%、残りはZn及び不可避不純物を含む、請求項1に記載の表面品質及び耐食性に優れた亜鉛合金めっき鋼材。
- 素地鉄を設ける段階と、
前記素地鉄をMg及びAlを含む亜鉛合金めっき浴に浸漬してめっきする段階と、
前記めっきされた素地鉄をワイピングし、冷却する段階と、を含み、
前記冷却は下記関係式1を満たす、表面品質及び耐食性に優れた亜鉛合金めっき鋼材の製造方法。
[関係式1]
0.7Vc≦Vc’≦1.5Vc
但し、Vcはワイピング直後のめっき層凝固完了までの平均冷却速度であり、Vc’はワイピング直後のめっき層凝固開始までの平均冷却速度である。 - 前記素地鉄を設ける段階は、
表層部の結晶粒サイズが1〜100μmである熱延鋼材を設け、
前記熱延鋼材を冷間圧延して、表面粗さ0.2〜1.0μm、急峻度0.2〜1.2μmを有する冷延鋼材を製造することを含む、請求項5に記載の表面品質及び耐食性に優れた亜鉛合金めっき鋼材の製造方法。 - 前記めっき浴の組成は、重量%で、Mg:0.5〜3.5%、Al:0.5〜20.0%、残りはZn及び不可避不純物を含む、請求項5に記載の表面品質及び耐食性に優れた亜鉛合金めっき鋼材の製造方法。
- 前記めっき浴の温度は430〜500℃である、請求項5に記載の表面品質及び耐食性に優れた亜鉛合金めっき鋼材の製造方法。
- 前記めっき工程における通板速度は60〜200MPM(meter per min.)である、請求項5に記載の表面品質及び耐食性に優れた亜鉛合金めっき鋼材の製造方法。
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KR1020170180329A KR102031466B1 (ko) | 2017-12-26 | 2017-12-26 | 표면품질 및 내식성이 우수한 아연합금도금강재 및 그 제조방법 |
PCT/KR2018/015833 WO2019132337A1 (ko) | 2017-12-26 | 2018-12-13 | 표면품질 및 내식성이 우수한 아연합금도금강재 및 그 제조방법 |
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CN (1) | CN111542640B (ja) |
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KR20230153716A (ko) * | 2022-04-29 | 2023-11-07 | 현대제철 주식회사 | 가공성 및 내식성이 우수한 도금 강재의 제조 방법 |
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EP3733921B1 (en) | 2023-03-01 |
CN111542640B (zh) | 2022-06-28 |
US11332816B2 (en) | 2022-05-17 |
US20210010123A1 (en) | 2021-01-14 |
KR102031466B1 (ko) | 2019-10-11 |
CN111542640A (zh) | 2020-08-14 |
US20220251696A1 (en) | 2022-08-11 |
WO2019132337A1 (ko) | 2019-07-04 |
EP3733921A1 (en) | 2020-11-04 |
ES2943861T3 (es) | 2023-06-16 |
US11643714B2 (en) | 2023-05-09 |
MX2020006644A (es) | 2020-09-14 |
KR20190078435A (ko) | 2019-07-04 |
EP3733921A4 (en) | 2020-12-30 |
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C60 | Trial request (containing other claim documents, opposition documents) |
Free format text: JAPANESE INTERMEDIATE CODE: C60 Effective date: 20230220 |
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A911 | Transfer to examiner for re-examination before appeal (zenchi) |
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C21 | Notice of transfer of a case for reconsideration by examiners before appeal proceedings |
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A912 | Re-examination (zenchi) completed and case transferred to appeal board |
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C211 | Notice of termination of reconsideration by examiners before appeal proceedings |
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