JP7244719B2 - 硬度及び耐型かじり性に優れた亜鉛めっき鋼板、その製造方法 - Google Patents
硬度及び耐型かじり性に優れた亜鉛めっき鋼板、その製造方法 Download PDFInfo
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Description
上記亜鉛めっき層は、柱状晶構造からなり、上記亜鉛めっき層に含まれるMgの含量は0.1~0.4wt.%である、硬度及び耐型かじり性に優れた亜鉛めっき鋼板に関する。
上記素地鋼板の上に、コーティング原料の電磁浮揚誘導加熱によって発生した蒸気を噴射して亜鉛めっき層を製造する段階と、を含み、
上記コーティング原料は、Mg含量が0.1~0.4wt.%であるZn-Mg合金またはZnとMgの混合物である、硬度及び耐型かじり性に優れた亜鉛めっき鋼板の製造方法に関する。
本発明は、真空蒸着技術を用いて亜鉛めっき層を形成する技術に関する。真空蒸着によって形成される亜鉛めっき層は、亜鉛結晶粒が柱状晶(columnar)構造で形成される特徴がある。真空蒸着によって形成される亜鉛めっき層は、柱状晶構造の亜鉛結晶粒密度が低くなるという問題があることを認識し、これを解決するために本発明を考案したものである。
このとき、上記亜鉛めっき層は、前述した真空蒸着工程により形成され、上記亜鉛めっき層の亜鉛結晶粒は柱状晶構造からなることが好ましい。溶融亜鉛めっきによって形成されためっき層は、鋳造組織と類似した構造を有し、電気亜鉛めっきによって形成されためっき層は、一般的に六角板状の構造を有する。
[亜鉛結晶粒界に存在するMgの含量(wt.%)]/[めっき層内のMgの含量(wt.%)- 0.1]≧0.95
厚さ0.1mmの冷延鋼板を準備し、比較例1でコーティング原料として使用されるMgの含量が0wt.%である純粋なZn(Pure Zn)を準備し、発明例1~4と比較例2、3でコーティング原料として使用されるMgの含量が0.1~0.6wt.%であるZn-Mg合金を準備した。
上記硬度は、マイクロビッカース試験機を使用して、押下荷重5gf、押下時間10秒として測定した。
◎:めっき鋼板を180°曲げ加工した後、テープに脱落しためっき層が全くない
○:めっき鋼板を180°曲げ加工した後、テープに微細なめっき跡だけが存在する
×:めっき鋼板を180°曲げ加工した後、テープに脱落しためっき層が存在する
Claims (3)
- 素地鋼板及び前記素地鋼板の上に形成された亜鉛めっき層を含み、
前記亜鉛めっき層は柱状晶構造からなり、前記亜鉛めっき層に含まれるMgの含量は0.1~0.4wt.%であり、
前記亜鉛めっき層の亜鉛結晶粒の平均サイズは80~200nmである、硬度及び耐型かじり性に優れた亜鉛めっき鋼板。 - 前記亜鉛めっき層は下記関係式1を満たす、請求項1に記載の硬度及び耐型かじり性に優れた亜鉛めっき鋼板。
[関係式1]
[亜鉛結晶粒界に存在するMgの含量(wt.%)]/[めっき層内のMgの含量(wt.%)- 0.1]≧0.95 - 素地鋼板を準備する段階と、
前記素地鋼板の上に、コーティング原料の電磁浮揚誘導加熱によって発生した蒸気を噴射して亜鉛めっき層を製造する段階と、を含み、
前記コーティング原料は、Mgの含量が0.1~0.4wt.%であるZn-Mg合金またはZnとMgの混合物であり、
前記亜鉛めっき層を製造する段階を真空度1×10 -2 mbar以下及び700℃以上の条件で行う、硬度及び耐型かじり性に優れた亜鉛めっき鋼板の製造方法。
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