Zn Al Mg Based Hot Dipped Steel Sheet

Abstract: This Zn-Al-Mg-based hot-dipped steel sheet comprises a hot-dipped layer formed on the surface of a steel sheet. The hot-dipped layer comprises, as an average composition, 5-22 mass% of Al and 1.0-10 mass% of Mg with the remainder including Zn and impurities. When the thickness of the hot-dipped layer is denoted by t, and a 5 mm square cross section that is parallel to the surface of the hot-dipped layer is exposed at any position selected from among a position of 3t/4, a position of t/2, and a position of t/4 from the surface of the hot-dipped layer, a fraction (B/A (%)) of a surface area fraction B of the [Zn phase] to a total surface area fraction A of the [Zn phase] and a [ternary eutectic structure of Al/MgZn2/Zn] of a plating structure in at least one cross section is 20% or higher.

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