Effect of the silicon content in steel on the hot-dip zinc coating microstructure formation

International Conference and Youth Scientific School on "Materials and Technologies of New Generations in Modern Materials Science"

Bondareva, O.S.^1 ; Melnikov, A.A.^1

Department of Metal Technology and Material Science, Samara National Research University, Samara, Russia^1

关键词: Coating thickness;    Energy dispersive microanalysis;    Eutectic reactions;    Hot dip zinc coating;    Maximum concentrations;    Phase formations;    Silicon contents;    Structural feature;   

Others  :  https://iopscience.iop.org/article/10.1088/1757-899X/156/1/012015/pdf
DOI  :  10.1088/1757-899X/156/1/012015

来源: IOP

【 摘 要 】

The aim of this study was to clarify the effect of the silicon content in steel on the structure of hot-dip galvanized zinc coating. It was found that in steel samples containing the silicon in an amount of about 0.1% and 0.5% the increased thickness coating was formed. This fact was associated with structural features of the ζ-phase. Energy dispersive microanalysis had shown the maximum concentration of silicon in the coating was observed in ζ-phase on St3 steel (Si = 0.1%) and in the fine mixture of δ and ζ-phase on 09G2S steel (Si>0.5%). This phenomenon was analyzed using a Zn-Fe-Si system diagram and its polytermic sections. It was found that there were eutectic reactions of decomposition the liquid to mixture (ζ+η+ FeSi) phases at the content of silicon in steel about 0.1% and more than 0.5%. Particles of FeSi-phase were involved in the dissolution of and δ phases, which led to a direct contact of the melt and the steel substrate. This process was accompanied by the intensive ζ-phase formation and the rapid growth of coating thickness.