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The solidification structure of the coating layer in hot-dip Zn-11%Al-3%Mg-0.2%Si coated steel sheet was studied by metallographic examinations together with the calculation of a phase diagram based on Thermo-Calc. The observation exhibited that the solidification structure is a combination of the Zn/Al/MgZn2 ternary eutectic structure, the primary fcc-Al phase and the MgZn2 phase, which is different from the predicted one under an equilibrium state in the sense that meta-stable MgZn2 instead of stable Mg2Zn11 was observed under the present condition. Excluding the Mg2Zn11 phase from the equilibrium phase diagram, the metastable phase diagram was calculated and excellent agreement was obtained between the calculation and the experiment in terms of the solidification structure of the coating layer. The small amount of Ti addition to the coating bath was confirmed to lead to the formation of fine dendrite structure. Detailed EBSD observation revealed that TiAl3 acts as heterogeneous nucleation sites of the primary fcc-Al.

Solidification Structure of Coating Layer in Hot-Dip Zn-11%Al-3%Mg-0.2%Si Coated Steel Sheet