| 摘要 |
A high Al hot-dip Zn-Al-Mg plated steel sheet is obtained by forming on a steel sheet surface a hot-dip plating layer comprising, in mass %, Al: more than 10 to 22% and Mg: 1-5%, and, optionally, Ti: 0.002-0.1%, B: 0.001-0.045% and Si: 0.005-0.5%. The plating layer exhibits a metallic structure of [primary crystal Al phase] mixed in a matrix of [Al/Zn/Zn2Mg ternary eutectic crystal structure]. Substantially no Zn11Mg2 phase is present in the metallic structure of the plating layer. |
