| 摘要 |
PROBLEM TO BE SOLVED: To provide a high strength high Si-containing galvanized steel sheet excellent in corrosion resistance without installing any new facility such as a pre-metal coating facility, and a production method therefor. SOLUTION: The high strength Si-containing galvanized steel sheet excellent in the corrosion resistance is characterized in that on a steel sheet having 0.2-2.0 mass % Si content, Zn-Al-Mg plated layer composed of 2-19 mass % Al, 1-10 mass % Mg and the balance Zn with inevitable impurities, is provided or on the steel sheet having 0.2-2.0 mass % Si content, Zn-Al-Mg-Si plated layer composed of 2-19 mass % Al, 1-10 mass % Mg, 0.01-2 mass % Si and the balance Zn with inevitable impurities, is provided, and further, these metal plated layers have the metallurgical structure where one or more kinds among [Mg2Si phase], [Zn2Mg phase], [Al phase] and [Zn phase ] coexist in the base of [three- component eutectic structure of Al/Zn/Zn2Mg].
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