JP6955036B2 - 合金コーティング鋼板およびその製造方法 - Google Patents
合金コーティング鋼板およびその製造方法 Download PDFInfo
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Description
図2は、本発明の第1実施形態による合金コーティング鋼板の模式図である。これを参照して説明すれば、前記製造方法により製造された本発明の第1実施形態による合金コーティング鋼板は、鋼板21;および前記鋼板21上に位置するAl−Mg−Si合金層23;を含み、前記Al−Mg−Si合金層23は、Al−Mg合金相24からなる合金層内に、Mg−Si合金粒25が含まれている形態であってもよい。
図3は、本発明の第2実施形態による合金コーティング鋼板の模式図である。これを参照して説明すれば、前記製造方法により製造された本発明の第2実施形態による合金コーティング鋼板は、鋼板21;前記鋼板上に位置するAl−Si合金層26;および前記Al−Si合金層26上に位置するAl−Mg−Si合金層23;を含み、前記Al−Mg−Si合金層23は、Al−Mg合金相24からなる合金層内に、Mg−Si合金粒25が含まれている形態であってもよい。
図2を参照して第3実施形態を説明すれば、前記製造方法により製造された本発明の第3実施形態による合金コーティング鋼板は、鋼板21;および前記鋼板上に位置するAl−Mg−Si合金層23;を含み、前記Al−Mg−Si合金層23は、合金層内のMg含有量の勾配(gradient)が存在するものであってもよい。
図2を参照して第4実施形態を説明すれば、前記製造方法により製造された本発明の第4実施形態による合金コーティング鋼板は、鋼板21;および前記鋼板上に位置するAl−Mg−Si合金層23;を含み、前記Al−Mg−Si合金層23内のMg含有量は、前記Al−Mg−Si合金層の総量100重量%に対して、15重量%以上であってもよい。より具体的には、15重量%以上、および90重量%以下であってもよい。
実施例1
冷延鋼板上にSi9重量%、Al88重量%、および残部としてFeを含むAlメッキ層が片面メッキ量15g/m2形成された溶融アルミニウムメッキ鋼板を準備した。Alメッキ層の厚さは約5μmであった。
前記実施例1と同様の方法で製造するが、300秒間熱処理された合金コーティング鋼板を製造した。
前記実施例1と同様の方法で製造するが、600秒間熱処理された合金コーティング鋼板を製造した。
前記実施例1と同様の方法で製造するが、Mgコーティング層の厚さを1.5μmにコーティングし、120秒間熱処理された合金コーティング鋼板を製造した。
前記実施例1と同様の方法で製造するが、Mgコーティング層の厚さを1.5μmにコーティングし、300秒間熱処理された合金コーティング鋼板を製造した。
前記実施例1と同様の方法で製造するが、Mgコーティング層の厚さを1.5μmにコーティングし、600秒間熱処理された合金コーティング鋼板を製造した。
鋼板上にSi9重量%、Al88重量%、および残部としてFeを含むAlメッキ層が片面メッキ量15g/m2形成された溶融アルミニウムメッキ鋼板を準備した。
片面メッキ量40g/m2の電気亜鉛メッキ鋼板を準備した。
片面メッキ量137.5g/m2の溶融亜鉛メッキ鋼板を準備した。
図4は、実施例2のMgをコーティングした溶融アルミニウムメッキ鋼板の熱処理前と熱処理後の走査電子顕微鏡写真である。
前記実施例5で製造された合金コーティング鋼板に対して、グロー放電分光器(装置名:GDS 850A、製造会社:LECO)を用いて鋼板上に形成されたコーティング層の成分を分析した。
前記実施例1〜6、および比較例1〜3の鋼板試験片に対して、塩水噴霧試験(ASTM B−117)方法を利用して初期赤錆発生時間を基準として表面耐食性を評価した。その結果を下記表1に示した。
前記実施例1と同様の方法で製造するが、Mgコーティング層の厚さを1.0μmにコーティングし、120秒間熱処理された合金コーティング鋼板を製造した。
前記実施例1と同様の方法で製造するが、Mgコーティング層の厚さを1.0μmにコーティングし、300秒間熱処理された合金コーティング鋼板を製造した。
前記実施例1と同様の方法で製造するが、Mgコーティング層の厚さを1.0μmにコーティングし、600秒間熱処理された合金コーティング鋼板を製造した。
前記実施例1と同様の方法で合金コーティング鋼板を製造するが、Mgコーティング層の厚さを1.0μmにコーティングし、熱処理を別途に実施しなかった。
図8は、熱処理前のコーティング層、400℃で120、300、600秒間熱処理したコーティング層の断面に対する走査電子顕微鏡写真である。
図10は、実施例7で製造された合金コーティング鋼板に対するTEM写真である。約120秒間の熱処理によってMgの拡散があった。これにより、Al−Mg合金層が形成された。Mg−Si合金相は形成されていない。
前記実施例7、実施例8、実施例9、および比較例4で製造された合金コーティング鋼板に対して、X−Ray回折装置(装置名:D/MAX−2500V−PC、製造会社:Rigaku)を用いてXRD分析を行った。
前記実施例7、実施例8、実施例9、および比較例4で製造された合金コーティング鋼板に対して、グロー放電分光器(装置名:GDS 850A、製造会社:LECO)を用いて鋼板上に形成されたコーティング層の成分を分析した。
前記実施例7、実施例8、実施例9、および比較例4で製造された合金コーティング鋼板に対して、塩水噴霧試験(ASTMB−117)方法を利用して初期赤錆発生時間を基準として表面耐食性を評価した。その結果を図20から確認できる。NHTの場合、別途の熱処理を実施しなかった合金コーティング鋼板であって比較例4に相当し、Type−1、Type−2およびType−3はそれぞれ実施例7、実施例8および実施例9に相当する。
12:逆マグネトロンスパッタリングソース
13:物理気相蒸着装置
14:誘導加熱装置
15:鋼板排出装置
16:真空容器
17:溶融アルミニウムメッキ鋼板
21:鋼板
22:Al−Si−Fe合金層
23:Al−Mg−Si合金層
24:Al−Mg合金相
25:Mg−Si合金相
26:Al−Si合金層
41:アルミニウム(Al)
42:マグネシウム(Mg)
43:シリコン(Si)
44:鉄(Fe)
51:冷延鋼板
52:Al−Fe−Si合金層
53:Al−Si合金層
54:Mg層
55:Al−Mg−Si合金層
Claims (15)
- 鋼板;および
前記鋼板上に位置するAl−Mg−Si合金層;を含み、
前記Al−Mg−Si合金層は、Al−Mg合金相からなる合金層内に、Mg−Si合金粒が含まれており、
前記Al−Mg−Si合金層内のMg含有量は、
前記Al−Mg−Si合金層の総量100重量%に対して、
15重量%以上、90重量%以下である、合金コーティング鋼板。 - 前記鋼板と前記Al−Mg−Si合金層との間に位置するAl−Si合金層;をさらに含む、請求項1に記載の合金コーティング鋼板。
- 前記Al−Mg−Si合金層は、合金層内のMg含有量の勾配(gradient)が存在する、請求項1または2に記載の合金コーティング鋼板。
- 前記Al−Mg合金相は、
Al3Mg2、Al12Mg17を含む、請求項1〜3のいずれか一項に記載の合金コーティング鋼板。 - 前記Al−Mg合金相は、
Al3Mg2、Al12Mg17以外のAlおよび
前記Alに固溶したMgを含む、請求項1〜4のいずれか一項に記載の合金コーティング鋼板。 - 前記Mg−Si合金粒は、
Mg2Siを含む、請求項1〜5のいずれか一項に記載の合金コーティング鋼板。 - 前記Mg−Si合金粒は、
不定形である、請求項1〜6のいずれか一項に記載の合金コーティング鋼板。 - 前記Al−Mg−Si合金層内のMg−Si合金粒の含有量は、
前記Al−Mg−Si合金層の総量100重量%に対して、1重量%以上、および70重量%以下である、請求項1〜7のいずれか一項に記載の合金コーティング鋼板。 - 前記鋼板、および前記Al−Mg−Si合金層の間に位置するAl−Fe−Si合金層;をさらに含む、請求項1〜8のいずれか一項に記載の合金コーティング鋼板。
- 前記Al−Mg−Si合金層上に位置するMg層;またはAl−Mg合金層;をさらに含む、請求項1〜9のいずれか一項に記載の合金コーティング鋼板。
- Al、およびSiが含まれているメッキ層を含むアルミニウムメッキ鋼板を準備する段階;
前記アルミニウムメッキ鋼板上にMgをコーティングしてMgコーティング層を形成する段階;および
Al−Mg−Si合金層が形成されるように、前記Mgがコーティングされたアルミニウムメッキ鋼板を熱処理してMgを前記メッキ層に拡散させる段階;を含み、
前記Al−Mg−Si合金層は、
Al−Mg合金相からなる合金層内に、Mg−Si合金粒が含まれた形態であり、
前記Mgがコーティングされたアルミニウムメッキ鋼板を熱処理してMgを前記メッキ層に拡散させる段階では、
5秒〜600秒間熱処理する、合金コーティング鋼板の製造方法。 - 前記Mgがコーティングされたアルミニウムメッキ鋼板を熱処理してMgを前記メッキ層に拡散させる段階では、
300℃〜450℃の温度で熱処理する、請求項11に記載の合金コーティング鋼板の製造方法。 - 前記Mgがコーティングされたアルミニウムメッキ鋼板を熱処理してMgを前記メッキ層に拡散させる段階では、
前記Al−Mg−Si合金層で前記Al−Mg合金相が生成され、
前記Al−Mg合金相は、
Al3Mg2、Al12Mg17を含む、請求項11または12に記載の合金コーティング鋼板の製造方法。 - 前記Mgがコーティングされたアルミニウムメッキ鋼板を熱処理してMgを前記メッキ層に拡散させる段階では、
前記Al−Mg−Si合金層で前記Mg−Si合金粒が生成され、
前記Mg−Si合金粒は、
Mg2Siを含む、請求項11〜13のいずれか一項に記載の合金コーティング鋼板の製造方法。 - 前記アルミニウムメッキ鋼板上にMgをコーティングしてMgコーティング層を形成する段階では、
物理気相蒸着(PVD)で行われる、請求項11〜14のいずれか一項に記載の合金コーティング鋼板の製造方法。
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