Structure of Surface Oxide Formed on Zinc-Coated Steel Sheet During Hot Stamping
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During hot stamping of hot-dip zinc-coated steel sheets such as hot-dip galvanized steel sheets and hot-dipgalvannealed 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, decreas-ing the corrosion resistance of hot-stamped members. Therefore, it is important to suppress excessive for-mation of ZnO. While the formation of Al oxides and Mn oxides along with ZnO layer during the hotstamping of hot-dip zinc-coated steel sheets can affect ZnO formation, crystal structures of such oxideshave not been elucidated clearly. Thus, this study aimed to analyze structures of oxides formed during hotstamping of hot-dip galvannealed steel sheets using transmission electron microscopy. Results indicatedthe formation of an oxide layer comprising ZnAl2O4 at the interface between ZnO and the coating layerwith Mn3O4 at the outermost of an oxide layer.
Abstract
During hot stamping of hot-dip zinc-coated steel sheets such as hot-dip galvanized steel sheets and hot-dipgalvannealed 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, decreas-ing the corrosion resistance of hot-stamped members. Therefore, it is important to suppress excessive for-mation of ZnO. While the formation of Al oxides and Mn oxides along with ZnO layer during the hotstamping of hot-dip zinc-coated steel sheets can affect ZnO formation, crystal structures of such oxideshave not been elucidated clearly. Thus, this study aimed to analyze structures of oxides formed during hotstamping of hot-dip galvannealed steel sheets using transmission electron microscopy. Results indicatedthe formation of an oxide layer comprising ZnAl2O4 at the interface between ZnO and the coating layerwith Mn3O4 at the outermost of an oxide layer.
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