Effect of Bi on surface wettability of molten zinc and X80 steel

doi:10.13251/j.issn.0254-6051.2023.02.004

Abstract

Abstract: Wetting behavior of Zn-xBi alloy melts (x=0.5, 1.0, 1.5, 2.0) with different substrates at 450 ℃ was studied by improved sessile drop method, and the surface tensions after wetting reaction were calculated. The morphology and structure of the surface and cross-section of the specimens after the wetting reaction were analyzed by means of scanning electron microscope-energy dispersive spectrometer (SEM-EDS). The results show that the surface tension of Zn-Bi alloy melts at 450 ℃ decreases first and then increases with the increase of Bi content. The contact angle between the Zn-1.0Bi alloy melt and X80 steel is the smallest, indicating that the wettability of molten zinc is the best after adding 1.0%Bi (mass fraction). The content of Bi in the Zn-Bi alloy melt affects the interfacial reaction intensity and interface structure, thereby reducing the surface tension and contact angle. The rapid adsorption of Bi element at the initial stage of wetting reduces the surface tension of molten zinc and reduces the contact angle. In the middle stage, it is controlled by the interfacial reaction intensity, which forms a precursor film and promotes the flow of zinc alloy melt on the steel substrate, thereby improving the wettability.

Key words: X80 steel, hot dip galvanizing, Bi, surface tension, wettability, precursor film

CLC Number:

TG172

Li Hangzhou, Peng Haoping, Xu Shouwu, Deng Song, Tu Hao, Lei Yun, Su Xuping. Effect of Bi on surface wettability of molten zinc and X80 steel[J]. Heat Treatment of Metals, 2023, 48(2): 23-29.

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