Molecular Dynamics Simulation Of The Rapid Solidification Of Liquid Zinc And The Corrosion Of Iron In Liquid Zinc

The great economic loss caused by great loss of zinc, failure of equipment and stoppingoperation for repair because of the corrosion of liquid zinc to the galvanizing equipment is great.The solution of the problem will be a good help for the reduction of the cost of production andthe dependence on the materials imported, and it is also good for reducing the equipmentmaintenance frequency and the loss of zinc and strip steel scrap caused by shutdowns to solvethe problem, which would reach goal of reducing the cost and improving hot galvanizationproduction and economic efficiency.Molecular dynamics simulations were adopted to study that rapid solidification process ofliquid metal Zn with different cooling rate, and the process of the diffusion of iron/zinc interfaceand the growth of iron /zinc intermetallic in this paper.The results showed that solidification structure of Zn was affected significantly by thecooling rate. Amorphous structure formed when the cooling rate exceeded 2.5×10¹²K/s; crystalformed when the cooling rate less than 7.0×10¹¹K/s; complex structure formed when the coolingrate was between7.0×10¹¹K/s and 2.5×10¹²K/s. The crystallization temperature increases withcooling rate decreasing; Amorphous transition temperature increases with cooling ratedecreasing.In 450℃, when steel contacts with liquid zinc, the solid solution of zinc in iron formed, andthen theζphase appeared at first. With the diffusion of iron atoms, when the concentration ofiron in theζphase increases, andδphase formed. Finally theΓphase layer formed betweenαphase andδphase.