JP2023507962A - 加工部耐食性に優れたZn-Al-Mg系溶融合金めっき鋼材及びその製造方法 - Google Patents
加工部耐食性に優れたZn-Al-Mg系溶融合金めっき鋼材及びその製造方法 Download PDFInfo
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- 229910000831 Steel Inorganic materials 0.000 title claims abstract description 81
- 239000010959 steel Substances 0.000 title claims abstract description 81
- 229910045601 alloy Inorganic materials 0.000 title claims abstract description 76
- 239000000956 alloy Substances 0.000 title claims abstract description 76
- 238000005260 corrosion Methods 0.000 title claims abstract description 59
- 230000007797 corrosion Effects 0.000 title claims abstract description 58
- 239000000463 material Substances 0.000 title claims abstract description 40
- 238000004519 manufacturing process Methods 0.000 title claims abstract description 22
- 229910018134 Al-Mg Inorganic materials 0.000 title claims description 24
- 229910018467 Al—Mg Inorganic materials 0.000 title claims description 24
- 238000007747 plating Methods 0.000 claims abstract description 66
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 claims abstract description 50
- 229910017708 MgZn2 Inorganic materials 0.000 claims abstract description 34
- 229910052742 iron Inorganic materials 0.000 claims abstract description 25
- 239000012535 impurity Substances 0.000 claims abstract description 8
- 229910052749 magnesium Inorganic materials 0.000 claims abstract description 8
- 238000005096 rolling process Methods 0.000 claims description 17
- 238000001816 cooling Methods 0.000 claims description 15
- 239000007789 gas Substances 0.000 claims description 10
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 8
- 229910052684 Cerium Inorganic materials 0.000 claims description 7
- 229910052790 beryllium Inorganic materials 0.000 claims description 7
- 229910052791 calcium Inorganic materials 0.000 claims description 7
- 229910052712 strontium Inorganic materials 0.000 claims description 7
- 229910052720 vanadium Inorganic materials 0.000 claims description 7
- 229910052727 yttrium Inorganic materials 0.000 claims description 7
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 claims description 6
- 238000010438 heat treatment Methods 0.000 claims description 4
- 230000009467 reduction Effects 0.000 claims description 4
- 229910052757 nitrogen Inorganic materials 0.000 claims description 3
- 239000001257 hydrogen Substances 0.000 claims description 2
- 229910052739 hydrogen Inorganic materials 0.000 claims description 2
- UFHFLCQGNIYNRP-UHFFFAOYSA-N Hydrogen Chemical compound [H][H] UFHFLCQGNIYNRP-UHFFFAOYSA-N 0.000 claims 1
- 229910007570 Zn-Al Inorganic materials 0.000 abstract description 2
- 239000010410 layer Substances 0.000 description 52
- 230000000052 comparative effect Effects 0.000 description 11
- 239000011701 zinc Substances 0.000 description 11
- 238000012545 processing Methods 0.000 description 9
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- 238000000576 coating method Methods 0.000 description 6
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- 238000005336 cracking Methods 0.000 description 5
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- 230000008569 process Effects 0.000 description 5
- 239000006104 solid solution Substances 0.000 description 5
- HCHKCACWOHOZIP-UHFFFAOYSA-N Zinc Chemical compound [Zn] HCHKCACWOHOZIP-UHFFFAOYSA-N 0.000 description 4
- 238000005452 bending Methods 0.000 description 4
- 238000010586 diagram Methods 0.000 description 4
- 229910000765 intermetallic Inorganic materials 0.000 description 4
- 238000011282 treatment Methods 0.000 description 4
- 229910000611 Zinc aluminium Inorganic materials 0.000 description 3
- 230000009471 action Effects 0.000 description 3
- 238000005275 alloying Methods 0.000 description 3
- HXFVOUUOTHJFPX-UHFFFAOYSA-N alumane;zinc Chemical compound [AlH3].[Zn] HXFVOUUOTHJFPX-UHFFFAOYSA-N 0.000 description 3
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 3
- 230000015572 biosynthetic process Effects 0.000 description 3
- 239000010960 cold rolled steel Substances 0.000 description 3
- 230000007547 defect Effects 0.000 description 3
- 229910052751 metal Inorganic materials 0.000 description 3
- 239000002184 metal Substances 0.000 description 3
- 239000000203 mixture Substances 0.000 description 3
- 150000003839 salts Chemical class 0.000 description 3
- XKRFYHLGVUSROY-UHFFFAOYSA-N Argon Chemical compound [Ar] XKRFYHLGVUSROY-UHFFFAOYSA-N 0.000 description 2
- CURLTUGMZLYLDI-UHFFFAOYSA-N Carbon dioxide Chemical compound O=C=O CURLTUGMZLYLDI-UHFFFAOYSA-N 0.000 description 2
- 229910001335 Galvanized steel Inorganic materials 0.000 description 2
- 230000002411 adverse Effects 0.000 description 2
- 230000006866 deterioration Effects 0.000 description 2
- 230000001747 exhibiting effect Effects 0.000 description 2
- 239000008397 galvanized steel Substances 0.000 description 2
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- UGFAIRIUMAVXCW-UHFFFAOYSA-N Carbon monoxide Chemical compound [O+]#[C-] UGFAIRIUMAVXCW-UHFFFAOYSA-N 0.000 description 1
- 239000004593 Epoxy Substances 0.000 description 1
- 229910001209 Low-carbon steel Inorganic materials 0.000 description 1
- 229910003023 Mg-Al Inorganic materials 0.000 description 1
- 229910019752 Mg2Si Inorganic materials 0.000 description 1
- 229910019805 Mg2Zn11 Inorganic materials 0.000 description 1
- 229910001297 Zn alloy Inorganic materials 0.000 description 1
- 229910000905 alloy phase Inorganic materials 0.000 description 1
- 229910052786 argon Inorganic materials 0.000 description 1
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 1
- 230000004888 barrier function Effects 0.000 description 1
- 230000008901 benefit Effects 0.000 description 1
- 239000004566 building material Substances 0.000 description 1
- 229910002092 carbon dioxide Inorganic materials 0.000 description 1
- 239000001569 carbon dioxide Substances 0.000 description 1
- 229910002091 carbon monoxide Inorganic materials 0.000 description 1
- 229910052804 chromium Inorganic materials 0.000 description 1
- 238000012937 correction Methods 0.000 description 1
- 239000013078 crystal Substances 0.000 description 1
- 238000005238 degreasing Methods 0.000 description 1
- 239000006185 dispersion Substances 0.000 description 1
- 125000004435 hydrogen atom Chemical class [H]* 0.000 description 1
- 230000001771 impaired effect Effects 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
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- 230000007774 longterm Effects 0.000 description 1
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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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Abstract
Description
厚さが0.8mmである低炭素鋼冷延鋼板を用意した後、上記冷延鋼板を脱脂し、この後、10vol%水素-90vol%窒素からなる還元性雰囲気で800℃に焼鈍熱処理した。この後、上記熱処理された素地鋼板を下記表1に記載された450℃のめっき浴に沈積して溶融めっきした後、溶融合金めっき層の厚さが約10μmになるようにガスワイピングを介してめっき付着量を制御し、ガス冷却、水冷却及び調質圧延(SPM)してZn-Al-Mg系溶融合金めっき鋼材を製造した。このとき、上記ガス冷却及び水冷却時に、下記表1に記載された条件を用いた。上記Zn-Al-Mg系溶融合金めっき鋼材にエポキシ系列の被覆を10μmの厚さで被覆した。このように製造された上記Zn-Al-Mg系溶融合金めっき鋼材について溶融合金めっき層の合金組成を測定した後、その結果を下記表1に示した。また、上記Zn-Al-Mg系溶融合金めっき鋼材を曲率半径5R、90°に曲げ加工した後、溶融合金めっき層内のMgZn2相の分率及び割れ数、被覆層の割れ発生有無、加工部耐食性などを評価した後、その結果を下記表2に示した。
○:被覆層割れ及びめっき層割れによって素地鉄が外部環境に露出する
×:被覆層に割れが発生せず、素地鉄が外部環境に露出しない
○:10日経過後の観察時に腐食生成物の生成無し
×:10日経過後の観察時に腐食生成物が生成有り
20、20’ 溶融合金めっき層
30、30’ 粗大割れ
40 被覆層
100、100’ Zn-Al-Mg系溶融合金めっき鋼材
Claims (9)
- 素地鉄;及び
前記素地鉄上に形成された溶融合金めっき層を含み、
前記溶融合金めっき層は重量%で、Al:8%超過~25%、Mg:4%超過~12%、残部Zn及びその他の不可避不純物を含み、
前記溶融合金めっき層内のMgZn2相の分率は10~45面積%であり、
前記MgZn2相はその内部に割れを有し、前記割れは鋼板の厚さ方向への断面を基準とするときに観察される視野で、前記鋼板の厚さ方向の垂直方向に100μm当たり3~80個存在する、加工部耐食性に優れたZn-Al-Mg系溶融合金めっき鋼材。 - 前記溶融合金めっき層は、Be、Ca、Ce、Li、Sc、Sr、V及びYからなる群から選択された1種以上を合計量で0.0005~0.009%の範囲でさらに含む、請求項1に記載の加工部耐食性に優れたZn-Al-Mg系溶融合金めっき鋼材。
- 前記割れは、その長さの合計が3~300μmである、請求項1に記載の加工部耐食性に優れたZn-Al-Mg系溶融合金めっき鋼材。
- 素地鉄を用意する段階;
前記素地鉄を重量%で、Al:8%超過~25%、Mg:4%超過~12%、残部Zn及びその他の不可避不純物を含むめっき浴に通過させて溶融めっきする段階;及び
前記溶融めっきされた素地鉄をガスワイピング及び冷却して、前記素地鉄上に溶融合金めっき層を形成させる段階;を含み、
前記冷却は、露点温度が-5~50℃であるガスを付与する第1段階;鋼材と水冷浴槽との温度差を10~300℃になるようにして冷却する第2段階;及び、調質圧延を適用する第3段階を含む、加工部耐食性に優れたZn-Al-Mg系溶融合金めっき鋼材の製造方法。 - 前記めっき浴は、Be、Ca、Ce、Li、Sc、Sr、V及びYからなる群から選択された1種以上を合計量で0.0005~0.009%の範囲でさらに含む、請求項4に記載の加工部耐食性に優れたZn-Al-Mg系溶融合金めっき鋼材の製造方法。
- 前記素地鋼板を溶融めっきする段階の前に、前記素地鋼板を400~900℃で熱処理する段階をさらに含む、請求項4に記載の加工部耐食性に優れたZn-Al-Mg系溶融合金めっき鋼材の製造方法。
- 前記熱処理は体積%で、5~20%の水素及び80~95%の窒素からなる還元性雰囲気で行われる、請求項6に記載の加工部耐食性に優れたZn-Al-Mg系溶融合金めっき鋼材の製造方法。
- 前記めっき浴の温度は400~550℃である、請求項4に記載の加工部耐食性に優れたZn-Al-Mg系溶融合金めっき鋼材の製造方法。
- 前記調質圧延時の圧下率は2%以下(0%は除く)である、請求項4に記載の加工部耐食性に優れたZn-Al-Mg系溶融合金めっき鋼材の製造方法。
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