JP5196074B2 - 切断端面耐食性及び加工部耐食性に優れた溶融アルミニウム合金めっき鋼材とその製造方法 - Google Patents
切断端面耐食性及び加工部耐食性に優れた溶融アルミニウム合金めっき鋼材とその製造方法 Download PDFInfo
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- JP5196074B2 JP5196074B2 JP2012518392A JP2012518392A JP5196074B2 JP 5196074 B2 JP5196074 B2 JP 5196074B2 JP 2012518392 A JP2012518392 A JP 2012518392A JP 2012518392 A JP2012518392 A JP 2012518392A JP 5196074 B2 JP5196074 B2 JP 5196074B2
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- Organic Chemistry (AREA)
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Description
本願は、2010年5月31日に、日本に出願された特願2010−124933号及び2010年6月10日に、日本に出願された特願2010−133087号に基づき優先権を主張し、その内容をここに援用する。
(1)本発明の一態様にかかる溶融アルミニウム合金めっき鋼材は、基材とめっき被膜とを備え、前記めっき被膜の組成が、質量%で、Fe:25〜75%、Mg:2〜20%、Ca:0.02〜2%を含有し、残部がAl及び不可避的不純物であり、前記めっき被膜がα−Mg相、Al3Mg2相のいずれか一方又は両方を含有し、前記めっき被膜の表層から深さ5μmまでの範囲におけるα−Mg相の体積分率と、Al3Mg2相の体積分率との合計が、1%以上40%以下である。
α−Mg相、Al3Mg2相の体積分率の合計が1%以上であれば、高い防食能を持つめっき層が得られる。上記の条件で得られるめっき層で得られるα−Mg相、Al3Mg2相の体積分率の合計の上限は40%程度である。より高い防食能を求める場合、上記体積分率の合計が3%以上であることが好ましく、5%以上、または、7%以上であることがさらに望ましい。
板厚0.8mmの低炭素アルミキルド冷延鋼板、肉厚10mmで辺の長さが10cmの等辺山形鋼、及び、板厚10mmの熱延鋼板を基材とし、表1に示す合金めっき層を有する表面処理鋼材を製造した。
めっき被膜を化学分析した結果を、表2に示す。
I=BG+Ip×exp(−(T2−Tx)2/Tw2) (式1)
体積分率の測定方法は、測定する各試料について、X線ディフラクトメータを用いてAl相の(200)回折線強度に対するα−Mg相の(002)およびAl3Mg2相相の(880)回折線強度の比を求めた。α−Mg相およびAl3Mg2相相の体積分率が既知のAl合金について、EDSによる分析結果とα−Mg相/Al相およびAl3Mg2相/Al相の回折線強度比から検量線を作成し、各試料の回折線強度比と検量線を比較することで体積分率を算出した。
めっき被膜を有する鋼板から、寸法:150mm×70mmの試料片を切り出した。この試料片に対して、長手部の切断端面を露出させたまま、塩水噴霧試験(JIS−Z2371)の塩水を0.5%に変更した噴霧試験を、1日に1時間実施し、その他の時間は、温度35℃、湿度40%に置く、乾湿繰り返し試験を40日間行った。この試験後に、試料片の切断端面の赤錆発生面積を測定した。切断端面の露出面積に対する端面赤錆発生面積を端面赤錆発生率として評価した。
評点:端面赤錆発生率
5:5%未満
4:5%以上10%未満
3:10%以上20%未満
2:20%以上30%未満
1:30%以上
実施例1で得ためっき鋼板から、寸法:50mm×50mmの試料片を切り出し、180度曲げを施して、試験片を作製した。
評点:加工部赤錆発生率
5:5%未満
4:5%以上10%未満
3:10%以上20%未満
2:20%以上30%未満
1:30%以上
実施例1で得ためっき被膜表面に、Cr6+を含まない化成被膜を2g/m2施した後、プライマーとして、エポキシ変性ポリエステル塗料(日本ペイント製 P−02)をバーコーターで塗布し、熱風乾燥炉にて、板温200℃で焼き付け、膜厚5μmの塗膜を形成した。
評点:塗膜膨れ幅
5:1mm未満
4:1mm以上2mm未満
3:2mm以上5mm未満
2:5mm以上10mm未満
1:10mm以上
スポット溶接試験は、0.8mm冷延鋼板を基材とするサンプルについて、以下の溶接条件下で、スポット溶接時の連続打点数を調査して行った。先端径4.5mmφ、先端角120度、外径13mmφのCu−Cr製電極を使用した。50Hz電源により、10サイクルの通電を行った。1.7kNの加圧力で通電前30サイクル、通電後10サイクル、アップダウンスロープなしで加圧した。
No.62〜63は、浴外の合金化温度が高く、α−Mg相、Al3Mg2相が失われているため、耐食性の各種試験結果が悪い。
Claims (11)
- 基材とめっき被膜とを備える溶融アルミニウム合金めっき鋼材であって、
前記めっき被膜の組成が、質量%で、Fe:25〜75%、Mg:2〜20%、Ca:0.02〜2%を含有し、残部がAl及び不可避的不純物であり、
前記めっき被膜がα−Mg相、Al3Mg2相のいずれか一方又は両方を含有し、
前記めっき被膜の表層から深さ5μmまでの範囲におけるα−Mg相の体積分率と、Al3Mg2相の体積分率との合計が、1%以上40%以下であることを特徴とする溶融アルミニウム合金めっき鋼材。 - 前記めっき被膜において、前記α−Mg相の体積分率が0.4%以上20%以下であることを特徴とする請求項1に記載の溶融アルミニウム合金めっき鋼材。
- 前記めっき被膜において、前記Al3Mg2相の体積分率が0.1%以上40%以下であることを特徴とする請求項1に記載の溶融アルミニウム合金めっき鋼材。
- 前記めっき被膜の組成中に含有されるFeの量が40〜55%であることを特徴とする請求項2に記載の溶融アルミニウム合金めっき鋼材。
- 前記めっき被膜の組成中に含有されるFeの量が30〜50%であることを特徴とする請求項3に記載の溶融アルミニウム合金めっき鋼材。
- 前記めっき被膜の組成が、さらに、質量%で、Si:0.0001〜2%及びREM:0.0001〜1%、Sr:0.0001〜2%の1種又は2種以上を含有することを特徴とする請求項1〜5のいずれか一項に記載の溶融アルミニウム合金めっき鋼材。
- 前記REMが、La−Ce合金であることを特徴とする請求項6に記載の溶融アルミニウム合金めっき鋼材。
- 請求項1〜5のいずれか一項に記載の溶融アルミニウム合金めっき鋼材に、塗装を施したことを特徴とする溶融アルミニウム合金めっき鋼材。
- 請求項1に記載の溶融アルミニウム合金めっき鋼材を製造する方法であって:
めっき浴に前記基材を浸漬するめっき工程と;
前記基材を前記めっき浴中に浸漬した状態で、または、前記めっき浴から前記基材を引き上げた後に、500℃以上700℃未満の温度で、3秒超60秒以下、前記基材を保持する合金化熱処理工程と;
を有することを特徴とする溶融アルミニウム合金めっき鋼材の製造方法。 - 請求項2に記載の溶融アルミニウム合金めっき鋼材を製造する方法であって:
めっき浴に前記基材を浸漬するめっき工程と;
前記めっき浴から前記基材を引き上げた後に、500℃以上700℃未満の温度で、3秒超60秒以下、めっきされた前記基材を加熱する合金化熱処理工程と;
を有することを特徴とする溶融アルミニウム合金めっき鋼材の製造方法。 - 請求項3に記載の溶融アルミニウム合金めっき鋼材を製造する方法であって:
めっき浴に前記基材を浸漬するめっき工程と;
前記基材を前記めっき浴中に浸漬した状態で、500℃以上700℃未満の温度で、3秒超60秒以下、前記基材を保持する合金化熱処理工程と;
を有し、
前記めっき浴からめっきされた前記基材を引き上げた後に、合金化熱処理を行わないことを特徴とする溶融アルミニウム合金めっき鋼材の製造方法。
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CN104884666B9 (zh) * | 2012-12-26 | 2017-09-22 | Posco公司 | 铝镁镀层钢板及其制造方法 |
JP6065884B2 (ja) * | 2013-07-31 | 2017-01-25 | Jfeスチール株式会社 | 切断端面の耐食性に優れた鋼板およびその製造方法 |
KR101527144B1 (ko) * | 2013-12-24 | 2015-06-10 | 주식회사 포스코 | 마그네슘-알루미늄 코팅 강판 및 그 제조 방법 |
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US9851313B2 (en) * | 2015-03-03 | 2017-12-26 | Panalytical B.V. | Quantitative X-ray analysis—ratio correction |
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CN108315684B (zh) * | 2018-04-24 | 2020-11-24 | 中国科学院力学研究所 | 一种圆环链的渗铝方法 |
JP6939825B2 (ja) * | 2019-01-31 | 2021-09-22 | Jfeスチール株式会社 | Al系めっき鋼板及びその製造方法 |
CN111304661A (zh) * | 2019-12-31 | 2020-06-19 | 上海大学 | 铝硅镁镀层及其制备方法 |
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JP2009120942A (ja) * | 2007-10-24 | 2009-06-04 | Nippon Steel Corp | 切断端面耐食性及び加工部耐食性に優れたアルミニウム合金めっき鋼板 |
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