Mechanical properties and corrosion resistance of hot-dipped Zn-Al-Mg coating based on first-principles

doi:10.13251/j.issn.0254-6051.2023.06.038

Abstract

Abstract: Effect of Zn, MgZn₂ and Mg₂Zn₁₁ in the hot-dipped Zn-Al-Mg coating products on the coating surface was systematically evaluated by using the first-principles calculation method. It is found that Mg₂Zn₁₁ has mechanical anisotropy and structural instability, which explains the phenomenon that the addition of Mg decreases the plasticity of the material. From the microscopic level, the reason why MgZn₂ improves the corrosion resistance of the hot-dipped Zn-Al-Mg coating is revealed. Mg atoms in MgZn₂ are found to effectively protect Zn atoms and hinder the corrosion of Zn atoms in MgZn₂ by Cl^-. The results deeply analyze the mechanical properties and corrosion resistance of the dipped Zn-Al-Mg coating from the theoretical aspect, which is helpful to guide the composition design and microstructure control of the coating, thus improving production efficiency.

Key words: first-principles, Zn-Al-Mg coating, mechanical properties, corrosion resistance, MgZn₂

CLC Number:

TG142.1

Shi Jianqiang, Zhang Siyuan, Jiang Haitao, Li Shouhua, Cao Xiaoen, Tian Shiwei. Mechanical properties and corrosion resistance of hot-dipped Zn-Al-Mg coating based on first-principles[J]. Heat Treatment of Metals, 2023, 48(6): 211-218.

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