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Molecular Dynamics Simulation of the Rapid Solidification of Liquid Zinc and the Corrosion of Iron in Liquid Zinc

Author: QiuHongChen
Tutor: WuJianJun
School: Hebei University of Technology
Course: Materials Science
Keywords: Liquid Zn Molecular Dynamics Rapid solidification Corrosion Microstructure
CLC: TG171
Type: Master's thesis
Year: 2011
Downloads: 17
Quote: 0
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Abstract


Zinc significant loss of fluid caused by the corrosion of zinc hot-dip galvanizing equipment , parts early failure and regular maintenance shutdowns , produce great economic losses . If you can solve this problem , not only to reduce production costs and dependence on imported materials , but also can reduce the number of equipment maintenance and the shutdown caused by strip steel scrap and zinc consumption , thereby enhancing the production of hot-dip galvanizing , to reduce costs and improve the economy benefits. In this paper, the molecular dynamics simulations , simulation study of a liquid metal Zn system under different cooling rates during rapid solidification , the growth process of the iron and zinc atoms through the interface diffusion of iron, zinc and iron zinc intermetallic compounds . The results show that : the decisive influence of the cooling rate on the evolution of the microstructure . Crystallization occurs when the cooling rate is greater than 2.5 × 10 12 K / S , and the resulting amorphous structure ; cooling rate is less than 7.0 × 10 11 K / s . Glass forming minimum cooling rate of 2.5 × 10 12 K / s to 7.0 × 10 11 < / sup> K / s . The crystallization temperature when the system formed crystalline state is reduced as the cooling rate increased ; forming an amorphous , glass transition temperature increases as the cooling rate increased . Analyzed combined through simulation and experiment , temperature of the process of corrosion of iron in the liquid zinc at 450 ℃ , various iron-zinc intermetallic compounds appear as follows : (1) is first formed of ζ phase ; (2) bred period with the further spread of the iron atoms time to start generating the δ phase ; (3) Finally, Γ phase layer formed between the iron matrix δ phase .

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CLC: > Industrial Technology > Metallurgy and Metal Craft > Metallurgy and Heat Treatment > Metal corrosion protection,metal surface treatment > Theory of metal corrosion
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