| abstract |
PROBLEM TO BE SOLVED: To provide a surface-treated plated steel sheet having excellent corrosion resistance in a processed part in a high corrosion resistance plated steel material to which Al, Mg and Si are added. SOLUTION: A plated layer of a plated steel sheet having a Zn alloy plated layer on one side or both sides of a steel sheet has [Mg 2 Si phase] and [Mg 2 Si phase] in a substrate of [Al / Zn / Zn 2 Mg ternary eutectic structure]. 2. It has a metal structure in which [Al phase] and [Zn 2 Mg phase] are mixed, and one plane interval in the lattice direction constituting the lattice plane of the Bravay lattice in [Al phase] is 2.57 mm or more. A plating layer containing an intermetallic compound having a lattice plane of 15 mm or less and the other surface interval of 3.64 mm or more and 4.46 mm or less, and further, the solid content of the aqueous resin (A) is formed on the upper layer of the plating layer A surface-treated plated steel sheet excellent in processed part corrosion resistance, in which a coating obtained by applying and drying an aqueous composition containing 5 to 50% by mass of metal oxide particles (B) with respect to 100% by mass. [Selection] Figure 1 |