| 摘要 |
PROBLEM TO BE SOLVED: To provide Pb-free hot dip Sn-Zn based plating which has excellent corrosion resistance, and is particularly suitable as an automotive fuel tank material. SOLUTION: The hot dip Sn based plated steel sheet is obtained by forming a hot dip plated layer containing, by weight, 1 to 20% Zn and 0.001 to 0.5% of one or more kinds selected from the group 4A elements (Ti, Zr and Hf), and containing 79.5 to 98.0% Sn on the surface of a steel sheet. The plated layer has a metallic structure in which an Sn single phase or a Zn single phase is coexistent in an Sn-Zn binary eutectic structure, and the major axis of the Zn single phase is <=5μm.
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