용융아연 도금욕에서 망간 산화물의 표면석출 거동
Behavior of the Surface Precipitation of Manganese Oxides during Hot-dip Galvanizing
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Advanced high strength steels undergo recrystallization annealing in reducing gas atmosphere before galvanizing to improve mechanical properties. The selective oxidations of elements such as Mn, Si, Cr and Al during annealing decrease wettability of liquid zinc, resulting in bare spots and other defects. In this work, Fe-3wt%Mn steel sheet was annealed at 780oC for 1200 sec. in 5% H2-N2 atmosphere and then dippedinto zinc bath held at 460oC, which contained 0.2wt% dissolved Al. MnO crystallines in the average sizeof 200 nm were formed on the surface after annealing. It is estimated that MnO has been detached into bath with the formation and growth of inhibition layer with longer immersion time during galvanizing. Noevidence of aluminothermic reduction of MnO has been found in this study.
Abstract
Advanced high strength steels undergo recrystallization annealing in reducing gas atmosphere before galvanizing to improve mechanical properties. The selective oxidations of elements such as Mn, Si, Cr and Al during annealing decrease wettability of liquid zinc, resulting in bare spots and other defects. In this work, Fe-3wt%Mn steel sheet was annealed at 780oC for 1200 sec. in 5% H2-N2 atmosphere and then dippedinto zinc bath held at 460oC, which contained 0.2wt% dissolved Al. MnO crystallines in the average sizeof 200 nm were formed on the surface after annealing. It is estimated that MnO has been detached into bath with the formation and growth of inhibition layer with longer immersion time during galvanizing. Noevidence of aluminothermic reduction of MnO has been found in this study.
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