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Influence of Aluminum on the Formation Behavior of Zn-Al-Fe Intermetallic Particles in a Zinc Bath

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Abstract

The shape, size, and composition of dross particles as a function of aluminum content at a fixed temperature were investigated for aluminum added to the premelted Zn-Fe melt simulating the hot-dip galvanizing bath by a sampling methodology. In the early stage, less than 30 minutes after Al addition, local supersaturation and depletion of the aluminum concentration occurred simultaneously in the bath, resulting in the nucleation and growth of both Fe2Al5Zn x and FeZn13. However, the aluminum was homogenized continuously as the reaction proceeded, and fine and stable FeZn10Al x formed after 30 minutes. An Al-depleted zone (ADZ) mechanism was newly proposed for the “η→η+ζ→δ” phase transformations. The ζ phase bottom dross partly survived for a relatively long period, i.e., 2 hours in this work, whereas the η phase disappeared after 30 minutes. In the early stage of dross formation, both Al-free large particles as well as high-Al tiny particles were formed. The dross particle size decreased slightly with increased reaction time before reaching a plateau. The opposite tendency was observed when the Al content was 0.130 mass pct; with a relatively high Al content, the nucleation of tiny η phase dross was significantly enhanced because of the high degree of supersaturation. This unstable η phase dissolved continuously and underwent simple transformation to the stable δ phase. The relationship between nucleation potential and supersaturation ratio of species is discussed based on the thermodynamics of classical nucleation theory.

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Acknowledgement

The authors are grateful to Professor S. Yamaguchi, Department of Materials Engineering, The University of Tokyo, Japan, for his helpful comments on the current study.

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Author notes

  1. Geun-Ho Park (Graduate Student)

    Present address: Steelmaking Technology Development Team, Technical Research Center, Hyundai Steel Company, Dangjin, Chungnam, 167-32, Korea

Authors and Affiliations

  1. School of Materials Science and Engineering, University of Ulsan, Ulsan, 680-749, Korea

    Joo Hyun Park (Professor) & Geun-Ho Park (Graduate Student)

  2. Surface Treatment Department, POSCO, Gwangyang, Jeonnam, 545-711, Korea

    Doo-Jin Paik (Manager) & Moon-Hi Hong (Project Manager)

  3. Department of Analysis and Assessment, Research Institute of Industrial Science and Technology (RIST), Pohang, 790-330, Korea

    Yoon Huh (Senior Researcher)

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  1. Joo Hyun Park
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Correspondence to Joo Hyun Park.

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Manuscript submitted March 26, 2011.

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Park, J.H., Park, GH., Paik, DJ. et al. Influence of Aluminum on the Formation Behavior of Zn-Al-Fe Intermetallic Particles in a Zinc Bath. Metall Mater Trans A 43, 195–207 (2012). https://doi.org/10.1007/s11661-011-0857-y

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