Effect of Ti content on microstructure of hot-dip 55wt.% Al-Zn coating

Abstract

Abstract: In order to study the effect of Ti content on the microstructure of hot-dip 55wt.% Al-Zn coating, hot-dip plating experiments were carried out on the aluminum-zinc substrate by configuring hot-dip galvanized aluminum liquid with different Ti contents. The surface, cross-section, and transition layer structure of aluminum-zinc coating with different Ti contents were analyzed by Optical Microscope(OM), Scanning Electron Microscope (SEM), and Energy Dispersive Spectrometer (EDS). The results showed that the microstructure of spangle on the surface of different Ti contents is basically the same, and the zinc spark and alloy layer on the surface of the coating are composed of Al-rich phase, Zn-rich phase, Si-rich phase, and Al-Zn-Fe-Si compound phase. When the Ti content is less than 0.035%, the size of the coating decreases significantly with the increase of Ti content, and the structure of the Ti-containing coating is relatively fine and dense. The addition of Ti increases the nucleation point during the solidification process of the plating solution, which is helpful to reduce the size of the spangle and refine the grain size of the coating alloy.

Key words: Al-Zn coating, Ti content, plating structure, spangle, grain refinement

CLC Number:

TG142.1

ZHANG Zhi-jian, XU Xue-ming, TANG Xing-chang, HUI Yang, LIU Xiao-hua, LI Kun-yu. Effect of Ti content on microstructure of hot-dip 55wt.% Al-Zn coating[J]. Journal of Lanzhou University of Technology, 2026, 52(1): 8-14.

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