Corrosion Science and Technology

The Corrosion Science Society of Korea (한국부식방식학회)
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Structure of Surface Oxide Formed on Zinc-Coated Steel Sheet During Hot Stamping

  • Shota Hayashida (Steel Research Laboratories, Nippon Steel Corporation) ;
  • Takuya Mitsunobu (Steel Research Laboratories, Nippon Steel Corporation) ;
  • Hiroshi Takebayashi (Steel Research Laboratories, Nippon Steel Corporation)
  • Received : 2024.02.07
  • Accepted : 2024.05.25
  • Published : 2024.06.30
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Abstract

During hot stamping of hot-dip zinc-coated steel sheets such as hot-dip galvanized steel sheets and hot-dip galvannealed steel sheets, an oxide mainly composed of ZnO is formed on the sheet surface. However, excessive formation of ZnO can lead to a decrease in the amount of metal Zn in the coating layer, decreasing the corrosion resistance of hot-stamped members. Therefore, it is important to suppress excessive formation of ZnO. While the formation of Al oxides and Mn oxides along with ZnO layer during the hot stamping of hot-dip zinc-coated steel sheets can affect ZnO formation, crystal structures of such oxides have not been elucidated clearly. Thus, this study aimed to analyze structures of oxides formed during hot stamping of hot-dip galvannealed steel sheets using transmission electron microscopy. Results indicated the formation of an oxide layer comprising ZnAl2O4 at the interface between ZnO and the coating layer with Mn3O4 at the outermost of an oxide layer.

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References

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