JP2012062509A - 表面処理鋼板、その製造方法およびそれを用いた樹脂被覆鋼板 - Google Patents
表面処理鋼板、その製造方法およびそれを用いた樹脂被覆鋼板 Download PDFInfo
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Abstract
【解決手段】鋼板の少なくとも片面に、Ni層、Sn層、Fe-Ni合金層、Fe-Sn合金層およびFe-Ni-Sn合金層のうちから選ばれた少なくとも1層からなる耐食性皮膜を有し、前記耐食性皮膜上に、Zrを含み、さらにCo、Fe、Ni、V、Cu、MnおよびZnのうちから選ばれた少なくとも1種の金属元素をその合計でZrに対する質量比で0.01〜10含有する密着性皮膜を有することを特徴とする表面処理鋼板。
【選択図】なし
Description
本発明の表面処理鋼板には、鋼板の少なくとも片面に、Ni層、Sn層、Fe-Ni合金層、Fe-Sn合金層およびFe-Ni-Sn合金層のうちから選ばれた少なくとも1層からなる耐食性皮膜を形成後、この耐食性皮膜上に、Zrを含み、さらにCo、Fe、Ni、V、Cu、MnおよびZnのうちから選ばれた少なくとも1種の金属元素を含有する密着性皮膜が形成されている。
1.1) 耐食性皮膜
鋼板表面に形成された耐食性皮膜は、下地鋼板と強固に結合し、樹脂被覆鋼板とされた後に引っ掻きなどで部分的に樹脂が欠落した場合でも、鋼板に優れた耐食性を付与するために、Ni層、Sn層、Fe-Ni合金層、Fe-Sn合金層およびFe-Ni-Sn合金層の単層あるいはそれらの多層からなる皮膜とする必要がある。Ni層の場合は、鋼板の片面あたりのNi付着量を200mg/m2以上とすることが好ましい。Fe-Ni合金層の場合は、鋼板の片面あたりのNi付着量を60mg/m2以上とすることが好ましい。Sn層またはFe-Sn合金層の場合は、鋼板の片面あたりのSn付着量を100mg/m2以上とすることが好ましい。Fe-Ni-Sn合金層の場合は、鋼板の片面あたりのNi付着量を50mg/m2以上、Sn付着量を100mg/m2以上とすることが好ましい。ここで、NiやSn付着量の測定は、蛍光X線による表面分析により行うことができる。
耐食性皮膜上に、Zrを含み、さらにCo、Fe、Ni、V、Cu、MnおよびZnのうちから選ばれた少なくとも1種の金属元素をその合計でZrに対する質量比で0.01〜10、より好ましくは0.01〜2含有する密着性皮膜を形成することにより、優れた湿潤樹脂密着性が得られ、筋状の表面欠陥の発生を確実に防止できる。この原因は、現在のところ明らかではないが、こうした金属元素がZrを含む皮膜中に取り込まれることにより、緻密で、表面の凹凸が均一に分布した皮膜が形成されるためと考えられる。
本発明の表面処理鋼板上に、樹脂を被覆して樹脂被覆鋼板とすることができる。上述したように、本発明の表面処理鋼板は湿潤樹脂密着性に優れているため、この樹脂被覆鋼板は優れた耐食性と加工性を有する。
A:冷延鋼板を、10vol%H2+90vol%N2雰囲気中で、700℃程度で焼鈍して、伸び率1.5%の調質圧延を行った後、アルカリ電解脱脂し、硫酸酸洗を施した後、めっき浴aを用いてNiめっき処理を施しNi層からなる耐食性皮膜を形成する。
B:冷延鋼板をアルカリ電解脱脂し、めっき浴aを用いてNiめっき処理を施した後、10vol%H2+90vol%N2雰囲気中で、700℃程度で焼鈍して、Niめっきを拡散浸透させた後、伸び率1.5%の調質圧延を行い、Fe-Ni合金層からなる耐食性皮膜を形成する。
C:冷延鋼板をアルカリ電解脱脂し、めっき浴aを用いてNiめっきを施した後、10vol%H2+90vol%N2雰囲気中で、700℃程度で焼鈍して、Niめっきを拡散浸透させ、伸び率1.5%の調質圧延を行った後、脱脂、酸洗し、めっき浴bを用いてSnめっき処理を施し、Snの融点以上に加熱保持する加熱溶融処理を施す。この処理により、Fe-Ni-Sn合金層とこの上層のSn層からなる耐食性皮膜を形成する。
D:冷延鋼板をアルカリ電解脱脂し、条件Aと同様に焼鈍、調質圧延した後、めっき浴bを用いてSnめっきを施した後、Snの融点以上に加熱保持する加熱溶融処理を施す。この処理により、Fe-Sn合金層とこの上層のSn層からなる耐食性皮膜を形成する。
湿潤樹脂密着性:温度130℃、相対湿度100%のレトルト雰囲気における180°ピール試験により湿潤樹脂密着性の評価を行う。180°ピール試験とは、図2の(a)に示すようなフィルム2を残して鋼板1の一部3を切り取った試験片(サイズ:30mm×100mm、表裏の二面をそれぞれn=1とし、各ラミネート鋼板についてn=2となる)を用い、図2の(b)に示すように、試験片の一端に重り4(100g)を付けてフィルム2側に180°折り返して30min間放置して行うフィルム剥離試験のことである。そして、図2の(c)に示す剥離長5を測定して評価し、各ラミネート鋼板について表裏二面の剥離長(n=2)の平均を求める。剥離長5は小さいほど、湿潤樹脂密着性が良好であるといえるが、剥離長5が20mm未満であれば、本発明の目的とする優れた湿潤樹脂密着性が得られていると評価する。
耐食性:ラミネート鋼板のラミネート面にカッターナイフを用い鋼板素地に達するカットを交差して施し、1.5質量%NaCl水溶液と1.5質量%クエン酸水溶液を同量ずつ混合した試験液80mlに浸漬し、55℃で9日間放置して、カット部の耐食性(表裏の二面をそれぞれn=1とし、各ラミネート鋼板についてn=2となる)を次のように評価し、○であれば耐食性が良好であるとする。
○:n=2とも腐食なし
×:n=2の1以上において腐食あり
筋状の表面欠陥:筋状模様の発生程度を目視で観察し、次のように評価した。
○:筋状模様が確認されない。
×:筋状模様が確認される。
2 フィルム
3 鋼板の切り取った部位
4 重り
5 剥離長
Claims (9)
- 鋼板の少なくとも片面に、Ni層、Sn層、Fe-Ni合金層、Fe-Sn合金層およびFe-Ni-Sn合金層のうちから選ばれた少なくとも1層からなる耐食性皮膜を有し、前記耐食性皮膜上に、Zrを含み、さらにCo、Fe、Ni、V、Cu、MnおよびZnのうちから選ばれた少なくとも1種の金属元素をその合計でZrに対する質量比で0.01〜10含有する密着性皮膜を有することを特徴とする表面処理鋼板。
- 密着性皮膜が、さらにリン酸類由来のPおよび/またはフェノール樹脂由来のCをその合計でZrに対する質量比で0.01〜10含有することを特徴とする表面処理鋼板。
- 密着性皮膜のZr付着量が、鋼板の片面あたり3〜200mg/m2であることを特徴とする請求項1または2に記載の表面処理鋼板。
- 鋼板の少なくとも片面に、Ni層、Sn層、Fe-Ni合金層、Fe-Sn合金層およびFe-Ni-Sn合金層のうちから選ばれた少なくとも1層からなる耐食性皮膜を形成後、Zrを0.008〜0.07モル/l(l:リットル)含み、さらにCo、Fe、Ni、V、Cu、MnおよびZnのうちから選ばれた少なくとも1種の金属元素をその合計でZrに対するモル比で0.01〜10含む水溶液中において、電気量密度1〜20C/dm2で陰極電解処理して密着性皮膜を形成することを特徴とする表面処理鋼板の製造方法。
- 鋼板の少なくとも片面に、Ni層、Sn層、Fe-Ni合金層、Fe-Sn合金層およびFe-Ni-Sn合金層のうちから選ばれた少なくとも1層からなる耐食性皮膜を形成後、Zrを0.008〜0.07モル/l(l:リットル)含み、さらにCo、Fe、Ni、V、Cu、MnおよびZnのうちから選ばれた少なくとも1種の金属元素をその合計でZrに対するモル比で0.01〜10含む水溶液中において、電流密度が、Zrが析出する電流密度とZrが析出しない電流密度との間を周期0.01〜0.4秒で変化し、1周期当りのZrが析出しない電流密度にある時間が0.005〜0.2秒である電流を用い、サイクル数が10以上で、Zrが析出する電流密度における全電気量密度が3〜20C/dm2となる電解条件で陰極電解処理して密着性皮膜を形成することを特徴とする表面処理鋼板の製造方法;ここで、Zrが析出しない電流密度の上限は、陰極電解処理に用いる水溶液の組成およびpHに依存する値である。
- 電流密度が、Zrが析出する電流密度とZrが析出しない電流密度との2値に変化する電流を用いることを特徴とする請求項5に記載の表面処理鋼板の製造方法。
- Zrが析出しない電流密度を0A/dm2にすることを特徴とする請求項6に記載の表面処理鋼板の製造方法。
- 水溶液が、さらにリン酸類および/またはフェノール樹脂をその合計でZrに対するモル比で0.01〜10含有することを特徴とする請求項4〜7のいずれか一項に記載の表面処理鋼板の製造方法。
- 請求項1〜3のいずれか一項に記載の表面処理鋼板に、樹脂が被覆されていることを特徴とする樹脂被覆鋼板。
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JP2010206515A JP5786296B2 (ja) | 2010-03-25 | 2010-09-15 | 表面処理鋼板、その製造方法およびそれを用いた樹脂被覆鋼板 |
CN201180015547.3A CN102812156B (zh) | 2010-03-25 | 2011-03-24 | 表面处理钢板及其制造方法、以及利用该表面处理钢板的树脂被覆钢板 |
US13/636,858 US20130130055A1 (en) | 2010-03-25 | 2011-03-24 | Coated steel sheet, method for producing the same, and resin-coated steel sheet obtained using the same |
MYPI2012004135A MY168768A (en) | 2010-03-25 | 2011-03-24 | Coated steel sheet, method for producing the same, and resin-coated steel sheet obtained using the same |
PCT/JP2011/058154 WO2011118846A1 (ja) | 2010-03-25 | 2011-03-24 | 表面処理鋼板、その製造方法およびそれを用いた樹脂被覆鋼板 |
EP11759646.0A EP2540867A4 (en) | 2010-03-25 | 2011-03-24 | SURFACE-TREATED STEEL PLATE, METHOD OF MANUFACTURING THEREFOR AND FABRICATED STEEL PLATE THEREWITH |
CN201610084810.9A CN105667007B (zh) | 2010-03-25 | 2011-03-24 | 表面处理钢板及其制造方法、以及利用该表面处理钢板的树脂被覆钢板 |
US15/475,393 US10392709B2 (en) | 2010-03-25 | 2017-03-31 | Coated steel sheet, method for producing the same, and resin-coated steel sheet obtained using the same |
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CN102812156A (zh) | 2012-12-05 |
EP2540867A4 (en) | 2014-01-22 |
JP5786296B2 (ja) | 2015-09-30 |
CN105667007A (zh) | 2016-06-15 |
MY168768A (en) | 2018-12-04 |
US20170204521A1 (en) | 2017-07-20 |
CN102812156B (zh) | 2016-12-07 |
US10392709B2 (en) | 2019-08-27 |
EP2540867A1 (en) | 2013-01-02 |
CN105667007B (zh) | 2018-02-06 |
WO2011118846A1 (ja) | 2011-09-29 |
US20130130055A1 (en) | 2013-05-23 |
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