Hot-Dip Sn-Zn Coated Steel Sheet Having Excellent Corrosion Resistance

摘要

An exemplary embodiment of a hot-dip Sn-Zn coated steel sheet is provided which can include a steel sheet and a hot-dip coating layer which is formed on a surface of the steel sheet. The coating layer can contain between about 1 mass % and about 8.8 mass % of Zn, and a remainder including between about 91.2 mass % and about 99.0 mass % of Sn and inevitable impurities. A ratio of an endothermic value of melting heat generated by Sn-Zn eutectic crystals and an endothermic value of melting heat generated by Sn primary crystals in the hot-dip coating layer can satisfy the following relationship: (endothermic value of melting heat generated by Sn primary crystals)/{(endothermic value of melting heat generated by Sn primary crystals)+(endothermic value of melting heat generated by Sn-Zn eutectic crystals)}>=about 0.3. Further, a temperature of an endothermic peak generated by melting of the Sn primary crystals can be between about 200° C. and about 230° C., and a temperature of an endothermic peak generated by melting of the Sn-Zn eutectic crystals may be between about 198° C. and about 200° C.