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    • 10. 发明公开
    • SURFACE-TREATED STEEL MATERIAL
    • EP4303340A1
    • 2024-01-10
    • EP22763430.0
    • 2022-03-04
    • NIPPON STEEL CORPORATION
    • YAMAGUCHI, Shinichi
    • C23C22/05B32B15/04C22C18/04C23C28/00
    • This surface-treated steel includes surface-treated steel comprising:
      a steel sheet;
      a plated layer including zinc formed on the steel sheet; and
      a film formed on the plated layer,
      wherein the film has a thickness of 100 nm or more and 1000 nm or less,
      wherein the film includes:
      an amorphous phase A containing Si, C, O, P, Zn, and V, and one or two or more kinds selected from the group consisting of Ti, Zr, and Al as constituent elements, wherein Zn/Si, which is a peak intensity ratio between Zn and Si, is 1.0 or more, and V/P, which is a mass ratio between V and P, is 0.050 to 1.000 when analysis is performed by EDS; and
      an amorphous phase B containing Si, O, and Zn, wherein the amorphous phase B has a Zn/Si ratio of less than 1.0, the Zn/Si ratio is a peak intensity ratio between Zn and Si when analysis is performed by EDS,
      a Zn content of the amorphous phase A is 10 mass% or less, and
      in a cross section in a thickness direction, a percentage of a length of an interface between the plated layer and the amorphous phase B to a length of an interface between the plated layer and the film is 30% or more.