JP6014681B2 - 極低温接合性に優れた溶融亜鉛めっき鋼板及びその製造方法 - Google Patents
極低温接合性に優れた溶融亜鉛めっき鋼板及びその製造方法 Download PDFInfo
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- JP6014681B2 JP6014681B2 JP2014548664A JP2014548664A JP6014681B2 JP 6014681 B2 JP6014681 B2 JP 6014681B2 JP 2014548664 A JP2014548664 A JP 2014548664A JP 2014548664 A JP2014548664 A JP 2014548664A JP 6014681 B2 JP6014681 B2 JP 6014681B2
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- 229910001335 Galvanized steel Inorganic materials 0.000 title claims description 41
- 239000008397 galvanized steel Substances 0.000 title claims description 41
- 238000004519 manufacturing process Methods 0.000 title claims description 13
- 229910000831 Steel Inorganic materials 0.000 claims description 73
- 239000010959 steel Substances 0.000 claims description 73
- 238000007747 plating Methods 0.000 claims description 54
- 239000002131 composite material Substances 0.000 claims description 30
- 229910052723 transition metal Inorganic materials 0.000 claims description 27
- 150000003624 transition metals Chemical class 0.000 claims description 27
- 230000001629 suppression Effects 0.000 claims description 22
- 239000013078 crystal Substances 0.000 claims description 20
- 238000001816 cooling Methods 0.000 claims description 17
- 238000005246 galvanizing Methods 0.000 claims description 14
- 239000011701 zinc Substances 0.000 claims description 13
- HCHKCACWOHOZIP-UHFFFAOYSA-N Zinc Chemical compound [Zn] HCHKCACWOHOZIP-UHFFFAOYSA-N 0.000 claims description 7
- 229910052725 zinc Inorganic materials 0.000 claims description 7
- 238000009713 electroplating Methods 0.000 claims description 5
- 230000005764 inhibitory process Effects 0.000 claims description 5
- 229910052742 iron Inorganic materials 0.000 claims description 5
- 238000005238 degreasing Methods 0.000 claims description 4
- 238000005554 pickling Methods 0.000 claims description 4
- 229910000765 intermetallic Inorganic materials 0.000 claims description 3
- 229910052759 nickel Inorganic materials 0.000 claims description 3
- 239000008151 electrolyte solution Substances 0.000 claims description 2
- 239000012535 impurity Substances 0.000 claims description 2
- 238000005304 joining Methods 0.000 claims 1
- 239000000155 melt Substances 0.000 claims 1
- 230000000630 rising effect Effects 0.000 claims 1
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 23
- 239000002585 base Substances 0.000 description 23
- 230000000052 comparative effect Effects 0.000 description 12
- 238000012360 testing method Methods 0.000 description 9
- 238000000034 method Methods 0.000 description 8
- 230000007797 corrosion Effects 0.000 description 5
- 238000005260 corrosion Methods 0.000 description 5
- 239000000853 adhesive Substances 0.000 description 3
- 230000001070 adhesive effect Effects 0.000 description 3
- 238000010438 heat treatment Methods 0.000 description 3
- 229910052739 hydrogen Inorganic materials 0.000 description 3
- 239000000203 mixture Substances 0.000 description 3
- 238000004140 cleaning Methods 0.000 description 2
- 239000011248 coating agent Substances 0.000 description 2
- 238000000576 coating method Methods 0.000 description 2
- 150000001875 compounds Chemical class 0.000 description 2
- 230000007547 defect Effects 0.000 description 2
- 239000007789 gas Substances 0.000 description 2
- 238000001953 recrystallisation Methods 0.000 description 2
- 238000007670 refining Methods 0.000 description 2
- 238000011282 treatment Methods 0.000 description 2
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical group N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 description 1
- 229910019142 PO4 Inorganic materials 0.000 description 1
- 239000003513 alkali Substances 0.000 description 1
- 238000000137 annealing Methods 0.000 description 1
- 238000000889 atomisation Methods 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- 230000015556 catabolic process Effects 0.000 description 1
- 239000010960 cold rolled steel Substances 0.000 description 1
- 230000006378 damage Effects 0.000 description 1
- 230000007423 decrease Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 229910001873 dinitrogen Inorganic materials 0.000 description 1
- 238000007598 dipping method Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000011156 evaluation Methods 0.000 description 1
- 238000002474 experimental method Methods 0.000 description 1
- 238000005188 flotation Methods 0.000 description 1
- 239000003517 fume Substances 0.000 description 1
- 239000001257 hydrogen Substances 0.000 description 1
- 125000004435 hydrogen atom Chemical class [H]* 0.000 description 1
- 238000007654 immersion Methods 0.000 description 1
- 230000000977 initiatory effect Effects 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 238000002156 mixing Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- NBIIXXVUZAFLBC-UHFFFAOYSA-K phosphate Chemical compound [O-]P([O-])([O-])=O NBIIXXVUZAFLBC-UHFFFAOYSA-K 0.000 description 1
- 239000010452 phosphate Substances 0.000 description 1
- 238000012545 processing Methods 0.000 description 1
- 238000011084 recovery Methods 0.000 description 1
- 239000000243 solution Substances 0.000 description 1
- 238000003466 welding Methods 0.000 description 1
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- C23C28/00—Coating for obtaining at least two superposed coatings either by methods not provided for in a single one of groups C23C2/00 - C23C26/00 or by combinations of methods provided for in subclasses C23C and C25C or C25D
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- 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
- C21D1/00—General methods or devices for heat treatment, e.g. annealing, hardening, quenching or tempering
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- Y10T428/00—Stock material or miscellaneous articles
- Y10T428/12—All metal or with adjacent metals
- Y10T428/12431—Foil or filament smaller than 6 mils
- Y10T428/12438—Composite
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- Y10T428/12493—Composite; i.e., plural, adjacent, spatially distinct metal components [e.g., layers, joint, etc.]
- Y10T428/12771—Transition metal-base component
- Y10T428/12785—Group IIB metal-base component
- Y10T428/12792—Zn-base component
- Y10T428/12799—Next to Fe-base component [e.g., galvanized]
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Description
通常のIF鋼を冷延し、アルカリ脱脂及び酸洗い処理により清浄化した後、60℃、pH5の条件で20Aの電流を印加して、鋼板の表面に遷移金属の一つであるFe電気めっきを行った。このときの、Feめっき量は、下表1の通りである。上記Feめっき後、5%H2−N2、−40℃露点雰囲気下で、焼鈍熱処理して保持した後、500℃まで冷却した。
Claims (10)
- 素地鋼板と、
前記素地鋼板上に形成され、Feと遷移金属の和が50〜90重量%、Alが10〜30重量%、残りは不可避な不純物からなる複合層と、
前記複合層上に形成され、Fe−Al系金属間化合物を含む抑制層(inhibition layer)と、
前記抑制層上に形成されている亜鉛めっき層と、を含み、
前記亜鉛めっき層の結晶粒(spangle)の平均直径が150μm以下である、極低温接合性に優れた溶融亜鉛めっき鋼板。 - SADP(制限視野回折パターン、Selected Area Diffraction Pattern)の分析時に、前記複合層は、前記抑制層及び素地鋼板の回折パターン(pattern)と一致する整合関係を有する、請求項1に記載の極低温接合性に優れた溶融亜鉛めっき鋼板。
- 前記複合層は、立方(cubic)構造である、請求項1に記載の極低温接合性に優れた溶融亜鉛めっき鋼板。
- 前記複合層の厚さは、80nm以上である、請求項1に記載の極低温接合性に優れた溶融亜鉛めっき鋼板。
- 鋼板を用意する段階と、
前記鋼板に遷移金属を350mg/m2以上のめっき量でめっきする段階と、
前記遷移金属がめっきされた鋼板を還元性雰囲気下、1.5〜6℃/sの昇温速度で、750〜900℃まで加熱し、20秒以上保持して、熱処理された鋼板を製造する段階と、
前記熱処理した鋼板を冷却する段階と、
前記冷却した鋼板をAlが0.1〜0.3wt%含まれた430〜480℃の溶融亜鉛めっき浴に2.5〜8秒間浸漬して亜鉛めっき鋼板を製造する段階と、
前記亜鉛めっき鋼板を−20℃/s以下の冷却速度でめっき層の結晶粒(spangle)の平均直径が150μm以下となるように冷却する段階と、
を含む、極低温接合性に優れた溶融亜鉛めっき鋼板の製造方法。 - 前記鋼板を用意する段階は、脱脂及び酸洗い処理を行うことを含む、請求項5に記載の極低温接合性に優れた溶融亜鉛めっき鋼板の製造方法。
- 前記遷移金属は、Fe、Co及びNiのうちの1種以上である、請求項5に記載の極低温接合性に優れた溶融亜鉛めっき鋼板の製造方法。
- 前記遷移金属としてFeがめっきされ、FeSO4・7H2O及び(NH4)2SO4が含まれた電解液で電気めっきを行う、請求項7に記載の極低温接合性に優れた溶融亜鉛めっき鋼板の製造方法。
- 前記熱処理した鋼板の冷却は、450〜500℃まで行う、請求項5に記載の極低温接合性に優れた溶融亜鉛めっき鋼板の製造方法。
- 前記溶融亜鉛めっき鋼板の素地鋼板及び抑制層の間に優れた界面密着力を有する複合層を形成するために、前記遷移金属をめっきする、請求項5に記載の極低温接合性に優れた溶融亜鉛めっき鋼板の製造方法。
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