JP2014501334A - 高耐食溶融亜鉛合金めっき鋼板及びその製造方法 - Google Patents
高耐食溶融亜鉛合金めっき鋼板及びその製造方法 Download PDFInfo
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Abstract
そのため、本発明は、素地鋼板及び溶融亜鉛合金めっき層を含み、上記溶融亜鉛合金めっき層の組成は重量%で、Al:1〜3%、Mg:1.5〜4.0%、残りはZn及び不可避な不純物を含み、Al+Mg:2.5〜7.0%で、Al/(Al+Mg):0.38〜0.48である高耐食溶融亜鉛合金めっき鋼板及びその製造方法を提供する。
Description
鋼帯を連続めっきする溶融めっき設備において、厚さ0.8mmの低炭素冷間圧延鋼板を素地鋼板とし、次のような条件で溶融亜鉛合金めっきを施した。このとき、ガスワイピングは窒素ガスを用い、めっき付着量が異なるめっき鋼板を製造し、塩水噴霧試験(KS−C−0223に準ずる塩水噴霧規格試験)によって、試片表面のさび発生面積が5%になるまでの経過時間を測定し、その結果を図3に示した。
−めっき浴組成:表1
−めっき浴温度及び浸漬時間:440℃、3秒
−めっき後の鋼板冷却速度:10℃/s(空気噴射)
一方、めっき浴の組成と、めっき組織の関係を通じて、溶融亜鉛合金めっき鋼板の耐食性を確認するため、実施例2を行った。
−めっき浴組成:表1
−めっき浴温度及び浸漬時間:440℃、3秒
−めっき後の鋼板冷却速度:10℃/s(空気噴射)
実施例3は上述した実施例2と異なり、厚さ2.6mmの低炭素熱間圧延鋼板を素地鋼板として実験を行った。めっき浴組成を除いた工程条件は上記実施例2と同様で、実施例3では片面のめっき付着量が90g/m2であるめっき鋼板を製造した。
実施例4はめっき後の冷却速度が及ぼす影響について調べるために実施した。実施例4は鋼帯を連続的にめっきする溶融めっき設備において、厚さ2.6mmの低炭素熱間圧延鋼帯を酸洗いなどの方法でスケールを除去してから、めっき浴組成が一定の、次のような条件でめっきを行った。片面のめっき付着量を60g/m2に調整し、及び、めっき層の凝固区間で空気噴射式冷却のみを用いるか、空気噴射式冷却チャンバと静電帯電型リン酸塩水溶液噴射を併用するかによって、鋼板の冷却速度を1〜15℃/s範囲に変化させた。めっき鋼板の表面品質と塩水噴霧試験(KS−C−0223に準ずる塩水噴霧規格試験)によって、試片表面のさび発生面積が5%になるまでの経過時間とを測定し、その結果を表4に示した。
−めっき浴組成/温度/浸漬時間:Al2.5%、Mg3.5%/450℃/3秒
−リン酸塩水溶液噴射条件:リン酸塩水溶液噴射圧力2.0kgf/cm2、空気噴射圧力3.0kgf/cm2、印加高電圧の強さ:−20kV
実施例5は、リン酸塩水溶液噴射を用いた冷却時の好ましい条件を確認するために実施した。実施例5は、厚さ0.8mmの低炭素冷間圧延鋼帯を、次のような条件で、ガスワイピングにより片面のめっき付着量が60g/m2であるめっき鋼板を製造し、めっき鋼板の表面外観及びめっき層の黒変性を評価し、表5にその結果を示した。
−めっき浴組成:Al2%、Mg3%
−めっき浴温度及び浸漬時間:440℃、3秒
−溶液噴射及び高電圧条件:表5参照
Claims (14)
- 素地鋼板及び溶融亜鉛合金めっき層を含み、
前記溶融亜鉛合金めっき層の組成は重量%で、Al:1〜3%、Mg:1.5〜4.0%、残りはZn及び不可避な不純物を含み、Al+Mg:2.5〜7.0%で、Al/(Al+Mg):0.38〜0.48である、高耐食溶融亜鉛合金めっき鋼板。 - 前記めっき層は、さらに、Si、Li、Ti、La、Ce、B及びPからなる群より選択される1種または2種以上が0.1%以下で含まれる、請求項1に記載の高耐食溶融亜鉛合金めっき鋼板。
- 前記溶融亜鉛合金めっき層のめっき組織は、Zn−Al−MgZn2の三元共晶組織を基地組織とし、Zn−MgZn2の二元共晶組織が分散されためっき組織を含み、Zn単相組織は10%以下で含まれ、MgZn2組織を残部として含む、請求項1に記載の高耐食溶融亜鉛合金めっき鋼板。
- 前記溶融亜鉛めっき鋼板の表面粗さ(Ra)は2μm以下である、請求項1に記載の高耐食溶融亜鉛合金めっき鋼板。
- 前記めっき層の表面にリン(P)が付着され、前記リンの含量は0.1〜500mg/m2である、請求項1に記載の高耐食溶融亜鉛合金めっき鋼板。
- 重量%で、Al:1〜3%、Mg:1.5〜4.0%、残りはZn及び不可避な不純物を含み、Al+Mg:2.5〜7.0%で、Al/(Al+Mg):0.38〜0.48である溶融亜鉛合金めっき浴を用意する段階と、
前記溶融亜鉛合金めっき浴に素地鋼板を浸漬し、めっきを行ってめっき鋼板を製造する段階と、
前記めっき鋼板をガスワイピングした後冷却する段階と、を含む高耐食溶融亜鉛合金めっき鋼板の製造方法。 - 前記溶融亜鉛合金めっき浴の温度が420〜450℃でめっきを行う、請求項6に記載の高耐食溶融亜鉛合金めっき鋼板の製造方法。
- 前記ガスワイピング時に用いるガスは窒素である、請求項6に記載の高耐食溶融亜鉛合金めっき鋼板の製造方法。
- 前記冷却は10℃/s以上の冷却速度で行う、請求項6に記載の高耐食溶融亜鉛合金めっき鋼板の製造方法。
- 前記冷却は空気を噴射して冷却し、噴射圧力は300mbar以下で行う、請求項6に記載の高耐食溶融亜鉛合金めっき鋼板の製造方法。
- 前記冷却は空気とリン酸塩水溶液をともに噴射する段階を含む、請求項6に記載の高耐食溶融亜鉛合金めっき鋼板の製造方法。
- 前記リン酸塩水溶液中のリンの含量は0.01〜5.0重量%である、請求項11に記載の高耐食溶融亜鉛合金めっき鋼板の製造方法。
- 前記冷却はリン酸塩水溶液と空気をともに噴射する2流体噴射ノズルを用い、前記リン酸塩水溶液の噴射圧力は0.3〜5.0kgf/cm2で、前記空気の噴射圧力は0.5〜7.0kgf/cm2である、請求項11に記載の高耐食溶融亜鉛合金めっき鋼板の製造方法。
- 前記噴射されたリン酸塩水溶液の液滴が−1kV〜−40kVに帯電されたメッシュ形態の帯電電極を通過して静電的に帯電される、請求項11に記載の高耐食溶融亜鉛合金めっき鋼板の製造方法。
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KR1020100137294A KR20120075235A (ko) | 2010-12-28 | 2010-12-28 | 고내식 용융아연합금 도금강판과 그 제조방법 |
KR10-2010-0137294 | 2010-12-28 | ||
PCT/KR2011/010099 WO2012091385A2 (en) | 2010-12-28 | 2011-12-26 | High corrosion resistant hot dip zn alloy plated steel sheet and method of manufacturing the same |
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JP2017190489A (ja) * | 2016-04-13 | 2017-10-19 | 新日鐵住金株式会社 | めっき鋼材 |
JP2018507321A (ja) * | 2014-12-24 | 2018-03-15 | ポスコPosco | リン酸塩処理性及びスポット溶接性に優れた亜鉛合金めっき鋼板及びその製造方法 |
JP2018532889A (ja) * | 2015-10-26 | 2018-11-08 | ポスコPosco | 曲げ加工性に優れた亜鉛合金めっき鋼板及びその製造方法 |
JP2018538446A (ja) * | 2015-12-24 | 2018-12-27 | ポスコPosco | 微細で均一なメッキ組織を有するメッキ鋼板およびメッキ鋼板の製造方法 |
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WO2022107837A1 (ja) * | 2020-11-18 | 2022-05-27 | 日本製鉄株式会社 | めっき鋼材 |
JP2022539130A (ja) * | 2019-06-26 | 2022-09-07 | ポスコ | めっき鋼線及びその製造方法 |
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KR101500043B1 (ko) * | 2012-12-21 | 2015-03-06 | 주식회사 포스코 | 가공성 및 가공부 내식성이 우수한 용융아연합금 도금강판 및 그의 제조방법 |
EP2954086B1 (fr) * | 2013-02-06 | 2017-01-11 | Arcelormittal | Ôle à revêtement znalmg à microstructure particulière et procédé de réalisation correspondant |
AT514229B1 (de) | 2013-04-29 | 2015-02-15 | Voestalpine Stahl Gmbh | Verfahren zur Oberflächenbehandlung eines metallischen Substrats |
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EP2659017A4 (en) | 2017-04-05 |
CN103282533B (zh) | 2017-02-08 |
US20130183541A1 (en) | 2013-07-18 |
KR20120075235A (ko) | 2012-07-06 |
EP3954800A2 (en) | 2022-02-16 |
ES2909851T3 (es) | 2022-05-10 |
US9302449B2 (en) | 2016-04-05 |
JP5764672B2 (ja) | 2015-08-19 |
WO2012091385A3 (en) | 2012-09-13 |
EP2659017B1 (en) | 2022-03-16 |
EP2659017A2 (en) | 2013-11-06 |
CN103282533A (zh) | 2013-09-04 |
EP3954800A3 (en) | 2022-03-02 |
WO2012091385A2 (en) | 2012-07-05 |
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