JP2022501508A - 溶接液化脆性に対する抵抗性及びめっき密着性に優れた高耐食めっき鋼板 - Google Patents
溶接液化脆性に対する抵抗性及びめっき密着性に優れた高耐食めっき鋼板 Download PDFInfo
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- JP2022501508A JP2022501508A JP2021516724A JP2021516724A JP2022501508A JP 2022501508 A JP2022501508 A JP 2022501508A JP 2021516724 A JP2021516724 A JP 2021516724A JP 2021516724 A JP2021516724 A JP 2021516724A JP 2022501508 A JP2022501508 A JP 2022501508A
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- steel sheet
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Images
Classifications
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Abstract
Description
SiはAlの合金形成により溶融点を低くし、Siの添加によりアルミニウムインゴット(ingot)の融点を下げてめっき浴温度を低く管理することができるという利点を有する。めっき浴温度が低くなる場合、めっき浴に溶出されたFeとAl及びめっき浴組成成分間の化学的結合により発生する固相のドロス生成量が減少するという利点を有することができる。したがって、本発明の一実施形態においてSi含有量は5%以上に定めることができる。しかし、めっき層のSi含有量が10%を超えると、めっき浴のSi含有量も高くなるが、その結果、Al合金のめっき浴温度が再び上昇する。また、SiはAl基地内に固溶されず、針状のSi相を形成し、Mg2Siのような二次相を容易に形成する特徴を有し、Si含有量が高い場合、めっき層の成形性が低下し、めっき層の密着性は減少させる問題が発生するため、適宜調節されるべきである。但し、Si含有量が5%以下の場合には、Siがめっき層内のFe−Al合金相の形成を抑制する機能が弱くなってFe−Al合金相の分率が過度になるため制御する必要がある。より好ましいめっき層内のSi含有量は6〜9%に定めることができる。
Znはめっき浴の溶融点を低くし、アルミニウムと比較して腐食環境において素地鋼板よりもさらに速く酸化または腐食される犠牲防食の役割を果たす。Al自体は犠牲防食の能力がないため、Zn含有量が5%未満であると、犠牲防食性の確保が困難になる。また、Zn含有量が低い場合、Mg−Zn合金相の形成も容易ではない。但し、Zn含有量が30%を超えると、溶接時のLME現象が発生するようになり、めっき中のめっき浴内に酸化物を容易に形成してめっきした後の鋼板の不良を誘発するようになる。したがって、本発明の一実施形態において上記Zn含有量は5〜30%に定めることができる。本発明の一実施形態においてより好ましいZn含有量を15〜25%に定めることができる。
Mgもめっき浴の溶融点を低くし、Znと同様に酸素親和力が高い元素であって、アルミニウムと比較して腐食環境においてより速く酸化または腐食される犠牲防食の特性がある。MgはZnのような役割を果たすが、少量でZnより効果的な犠牲防食性を示す。したがって、ZnによるLMEの危険性を減少させながら、十分な犠牲防食性を得るために、上記Mg含有量を1%以上に定めることができる。Mg含有量が多すぎると高い酸素親和力により、めっき浴中の酸化物生成の結果物であるドロスを誘発することがある。ドロスはめっき後の鋼板の凹み不良を誘発するようになる。また、MgはSiとの高い親和力でMg2Siのような二次相を形成してめっき層の密着性を悪化させることもある。このような点を考慮して、本発明の一実施形態では、上記Mg含有量の上限を7%に定めることができる。本発明の一実施形態においてより好ましいMg含有量は、1.5〜5%であることができる。
Be及びSrは酸化力が強い元素としてめっき浴内にBe及びSrの2元素のうち1種以上を含む場合、めっき浴の表面にBe及びSrの酸化皮膜が形成されてめっき浴の蒸発によるアッシュ(ash)発生量を減らすことができる。また、これら元素は、めっき層の表面でもBe及びSrの酸化膜を形成して表面を安定化させるため、少量添加することができる。但し、Be及びSrの含有量が高すぎると、これら元素の酸化物がめっき浴内で過度に生成されて欠陥を誘発することがあり、成分投入コストが増加するため、本発明の一実施形態では、これら元素の含有量の合計を0.5%以下に制限することができる。上述した組成範囲を満たす限り、これら元素は不純物として存在することもできる。
素地鋼板をめっきする前に素地鋼板を上述した範囲で加熱する。すなわち、高強度鋼の場合、二相域温度で熱処理を介して強度を確保し、還元熱処理を介して表面の清浄度を確保する必要があるが、このためには、上述した範囲で鋼板を加熱する必要がある。より好ましい温度範囲は750〜1000℃である。
めっき浴温度は530〜750℃に制限する。めっき浴温度が530℃未満であると、アルミニウムの粘度が増加してめっき浴内のロールの駆動性が劣り、750℃を超えると、めっき浴の蒸発によるアッシュ(ash)発生量及びめっき浴内のFe−Al間の結合によるドロス発生量が増加する。また、相変態を伴う高強度鋼の場合、高い温度で材質の高温劣化を発生させ、機械的物性の変化を誘発することがある。本発明の一実施形態では、高強度鋼の強度低下を防止するために上記めっき浴の温度を700℃以下または600℃以下に制限することもできる。
鋼板の引込温度がめっき浴温度−20℃よりも低いと溶融アルミニウムの濡れ性が低下し、めっき浴温度+50℃を超えると、局部的にめっき浴温度を上昇させてめっき浴の温度管理が難しいという欠点がある。
本発明のようにSi、Zn及びMgを含むAl系めっきでは、各固溶元素または合金相の冷却速度が異なるため、エアナイフを用いためっき付着量を調節する際、注意する必要がある。すなわち、本発明で実現しようとする有利な合金層の構成を得るためには、エアナイフによるめっき付着量の調節を2段階に分けて実施することが有利である。すなわち、めっき層が凝固される初期に凝固速度が遅い場合には、めっき層内の様々な相が形成され、これにより部分的に未めっきが発生することがある。本発明の一実施形態では、このような問題を回避するために、鋼板温度が530〜500℃まで減少する場合には、めっき付着量を調節するためのエアナイフを鋼板に近づけて強い速度でブローすることでめっき層の速い凝固を図る。すなわち、本発明の一実施形態では、上記温度までは鋼板とエアナイフとの間の距離を6〜10mmに調節して、エアナイフで吐出されるガスの線速度を150〜250m/s、好ましくは180〜220m/sに急速に調節する。この後には、付着量を精密に調節するために鋼板とエアナイフとの間の距離を10mm超過〜14mm以内に調節し、ブローされる気体量も30〜70m/sに調節する。
めっき層内で適量のMg2Si相が形成されるようにするためには、素地鋼板のFe成分がめっき層に拡散される前にMg2Siが形成されるようにする必要がある。このためには、めっきされた鋼板を冷却速度7℃/秒以上で冷却する必要があり、好ましくは10℃/秒以上の冷却速度で冷却することができる。本発明の一実施形態においてFeの拡散を抑制し、Mg2Si相をめっき層内に形成させるための冷却は350℃まで制御することができる。冷却速度が速い場合には、Mg2Si相ではなく、非晶質相に近い相が形成されることができるため、Mg2Si相の円滑な形成のために上記冷却速度は25℃/秒以下、好ましくは20℃/秒以下、より好ましくは15℃/秒以下に制限することができる。必要に応じて、上記めっき後の冷却開始前にめっき付着量を調節する過程を行ってもよい。このような場合には、冷却速度はめっき付着量が調節された後から350℃までの冷却速度を意味する。もし、めっき付着量の調節がない場合には、めっき浴から取り出される時点から350℃までの冷却速度を意味することができる。本発明の一実施形態においてめっき付着量の調節は、エアナイフを用いることができ、このような場合、本段階の冷却速度は、エアナイフの直後から350℃までの冷却速度とすることができる。上記冷却速度は、冷却速度を計算する時点(すなわち、エアナイフを利用する場合にはエアナイフの直後の温度、エアーナイフを利用しない場合にはめっき浴から取り出される時点の温度)と350℃との間の平均冷却速度を意味する。
また、本発明の一実施形態では、350℃から80℃までの冷却速度を5〜15℃/秒に制御することができる。上述した冷却速度の範囲では、MgZn2相がFe−Al合金層の直上で連続的に形成されることができる。上記温度範囲での冷却速度が速すぎる場合には、一種が非平衡相であるMgZn2相が連続的に形成され難いため、上記冷却速度を15℃/秒以下に制限することができる。冷却速度が遅すぎる場合には、追加的なMg2Si相のような不必要な二次相がめっき層内で多量生成され、MgZn2相の成長を妨害することができ、上記冷却速度は5℃/秒以上に制限することができる。本発明での冷却速度は、該当温度区間の平均冷却速度という点に留意する必要がある。したがって、350℃以下の一部の温度区間までも高い冷却速度で冷却することができるが、単に平均冷却速度が上述した範囲に該当する場合には、上述した条件を満たすものとする。また、80℃未満の温度範囲では、冷却速度による鋼板の物性差が大きくないため、本発明の一実施形態ではこれを特に制限しない。
本発明のめっき浴成分は実質的にめっき層と同一である。但し、めっき後の素地鋼板との合金化の過程でめっき層にFeが1〜2%増加することがあるため、めっき浴中のFe含有量は、めっき層中のFe含有量に比べて1〜2%程度低くてもよい。本発明の一実施形態において使用されるめっき浴中のFe含有量は4%以下であってもよく、他の実施形態では、上記Fe含有量は0.5〜3%であってもよい。
素地鋼板(強度1.2GPa)を用意し、連続焼鈍炉を用いて950℃に昇温した後、下記表1に記載されたアルミニウム系めっき浴に浸漬してアルミニウム系めっきを施した(表において発明例5、6、7を除いたすべての実施例で示されていない残りの成分は、0.1%未満まで含まれた不純物及び20ppmのBe、40ppmのSrを除いてAlである。但し、発明例5の場合には、BeとSrのうち20ppmのBeのみが添加されており、発明例6は、40ppmのSrのみを添加、発明例7は、Be及びSrを添加しない点において他の例と相違する)。めっき浴温度及びめっき浴に引込される鋼板の温度は、表1に記載したように調節された。めっき浴から取り出されるすべての鋼板に対してエアナイフを用いて付着量を60g/m2に調節した後、350℃までの平均冷却速度とこの後の350℃から80℃までの冷却速度を表1に記載されたように制御してめっき鋼板を得た。エアナイフを用いて付着量を調節する際、鋼板の温度が540℃になるまではエアナイフと鋼板との間の距離を8mmに調節し、噴射されるガスの線速度を200m/sとし、その後にはエアナイフと鋼板との間の距離を12mm、ガスの線速度を50m/sに調節した。得られためっき鋼板のめっき層の組成(Si、Zn、Mg、Be、Sr及び不純物の含有量)は、Feを除いては、めっき浴の組成と実質的に同一であり、約1%のFeが増加(ピックアップ)された結果を示していた(Al含有量は、添加元素及び不純物を除いた残部である)。また、得られためっき鋼板のめっき層は、発明例及び比較例においていずれも素地鋼板との界面からFe−Al合金層、MgZn2合金層、Al合金層の順に積層されており、Mg2Si相が粒子形態で存在していることを確認することができた。
めっき後の試験片の断面をSEM観察した後、EDSを介して相の区分を行う。MgZn2層と接する合金層(Fe−Al層)との界面で垂直方向に測定し、鋼板及びFe−Al相の界面の長さを基準として3μmおきに10回測定したものを平均とし、1回の平均厚さとして定め、位置別に計5回測定して得られた各回当たりの厚さを平均して、最終の厚さとする。
めっき後の試験片の断面をSEM観察した後、EDSを介して相の区分を行う。この後、各試験片につき10枚以上の写真を確保し、該当相(粒子)の長軸の大きさを測定して平均値を利用する。
めっき層の最上部に形成されるAl合金層を除去して観察した時、全体面積に対してMgZn2相が占有する面積割合と定める。観察されたMgZn2相とFe−Al合金相との間には、他の相が存在しないということも、切断面の分析などによって確認した。
めっき後の試験片の断面をSEM観察した後、EDSを介して相の区分を行う。この後、各試験片につき10枚以上の写真を確保し、これを画像解析ソフトウェアによって、該当相の分率を求めた後の平均値を利用する。
めっき層の最上部に形成されるAl合金層を除去して観察した時、全体面積に対してMgZn2相が占有する面積割合と定める。
ISO 18278−2基準に合わせてスポット溶接を実施し、溶接電流はExpulsion電流から0.5kA低く設定した。溶接後の鋼板の断面をOM或いはSEMで観察して熱影響部のクラックの有無によって、該当試験片のLMEクラックの発生有無を判断した。
鋼板の表面に自動車構造用接着剤を塗布した後、乾燥して凝固を完了させた後、90度に曲げて接着剤とめっき鋼板を分離することで、めっき層が剥離されて接着剤が付着したかを確認してめっき密着性を評価した。めっき層が剥離されず、接着剤が付着していない良好な場合は未剥離、めっき層が剥離され、接着剤が付着した不良の場合は剥離と示した。
アルミニウムめっきされた試験片を10−2/sの変形速度で引張実験を行い、引張強度の変化を測定した。めっきしていない冷間圧延鋼板(CR)の試験片も同様に実験し、その結果を比較した。
良好(めっき材の引張強度/CR材の引張強度=0.80以上)
劣位(めっき材の引張強度/CR材の引張強度=0.80未満)
3.5%NaCl溶液でSalt Spray Test(SST)を行い、赤錆が発生するまでにかかった時間で判断した。
優秀:2000h超過
普通:1000h〜2000hの間
劣位:1000h未満
Claims (11)
- 素地鋼板及び前記素地鋼板との界面から順にFe−Al合金層及びMgZn2層を含むめっき層からなる高耐食めっき鋼板。
- 前記Fe−Al合金層はその厚さが1〜8μmである、請求項1に記載の高耐食めっき鋼板。
- 前記MgZn2層はその厚さが0.5μm以上である、請求項1に記載の高耐食めっき鋼板。
- 前記めっき層は前記MgZn2層の上部にAl合金層をさらに含む、請求項1に記載の高耐食めっき鋼板。
- 前記MgZn2相が前記めっき層内において前記Fe−Al合金相の直上で占める割合が90%以上である、請求項4に記載の高耐食めっき鋼板。
(但し、前記比率は、前記MgZn2より上部に形成される層を除去して観察したとき、全体面積に対して前記MgZn2相が占有する面積割合と定める) - 前記めっき層は、Mg2Si相を面積基準で10%以下含む、請求項1から5のいずれか一項に記載の高耐食めっき鋼板。
(但し、前記Mg2Si相の割合は、前記めっき鋼板を切断して、切断面を観察したとき、前記めっき層全体の面積に対してMg2Si相が占有する面積割合と定める) - 前記素地鋼板に接する前記Mg2Si相の面積割合は2%以下である、請求項6に記載の高耐食めっき鋼板。
(但し、前記Mg2Si相の割合は、Mg2Siよりも上部に形成される層を除去して観察したとき、全体面積に対して前記Mg2Si相が占有する面積割合と定める) - 前記めっき層は重量基準で、Si:5〜10%、Zn:5〜30%、Mg:1〜7%を含む組成を有する、請求項1から5のいずれか一項に記載の高耐食めっき鋼板。
- 前記めっき層の組成は重量基準で、Be及びSrを合わせて0.5%以下をさらに含む、請求項8に記載の高耐食めっき鋼板。
- 素地鋼板を準備する段階;
前記素地鋼板を700〜1050℃に加熱する段階;
前記鋼板を530〜750℃に維持したアルミニウム系めっき浴に浸漬してアルミニウムめっき鋼板を得る段階;
得られたアルミニウム系めっき鋼板のめっき付着量を調節する段階;
350℃まで7〜25℃/秒の冷却速度で冷却する段階;及び
350℃から80℃まで5〜15℃/秒の冷却速度で冷却する段階を含む高耐食めっき鋼板の製造方法。 - 前記鋼板をめっき浴に引込する温度は、めっき浴温度−20℃〜めっき浴温度+50℃である、請求項10に記載の高耐食めっき鋼板の製造方法。
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JP7187686B2 (ja) | 2022-12-12 |
WO2020067678A1 (ko) | 2020-04-02 |
US11530470B2 (en) | 2022-12-20 |
CN112771197A (zh) | 2021-05-07 |
EP3859045A4 (en) | 2022-01-05 |
KR102354447B1 (ko) | 2022-03-21 |
US20210340650A1 (en) | 2021-11-04 |
CN112771197B (zh) | 2024-04-02 |
EP3859045B1 (en) | 2023-07-05 |
EP3859045A1 (en) | 2021-08-04 |
KR20200035740A (ko) | 2020-04-06 |
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