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Fe Solubility in the Zn-Rich Corner of the Zn-Al-Fe System for Use in Continuous Galvanizing and Galvannealing

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Abstract

The concentration of Al and Fe in molten zinc saturated with delta (∼Fe2Zn10Al) or eta (∼Fe2Al5Zn) intermetallic precipitates has been measured by melt equilibration for temperatures in the range of 450 °C to 480 °C. This information has generated a thermodynamic model for the phase equilibrium in the zinc-rich corner of the Zn-Al-Fe system for the range of compositions and temperatures of commercial interest in continuous galvanizing and galvannealing. The model is constrained by the reported activities of Al in the molten zinc phase and permits small compositional variance of the intermetallic solids. The resultant isothermal phase diagrams are compared with the work of others.

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Abbreviations

G E :

integral excess Gibbs energy

\(G^{E}_{i}\) :

integral excess Gibbs energy of phase i

\(G^{E}_{{i - j}}\) :

integral excess Gibbs energy in binary system i-j

\(\ifmmode\expandafter\bar\else\expandafter\=\fi{G}^{E}_{i}\) :

partial excess Gibbs energy of component i

\(\Delta H^{ \circ }_{{298}}\) :

standard enthalpy of formation at 298 K

\(S^{ \circ }_{{298}}\) :

standard entropy at 298 K

L:

liquid

R:

universal gas constant

X i :

mole fraction of component i

δ SS :

delta solid solution

ε A−B :

interaction coefficient of component B on A

η SS :

eta solid solution

γ i :

activity coefficient of component i

\(\gamma ^{ \circ }_{i}\) :

Henrian activity coefficient of component i (i.e., infinite dilution)

ζ :

FeZn13 phase

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Acknowledgments

The experiments were performed while J.R. McDermid was a Senior Scientist at the former Noranda Inc.–Technology Centre. The authors thank Falconbridge Inc. for their permission to publish this work. The authors also thank Mr. B. Henshaw for performing the solubility experiments and the staff in the Analytical Chemistry Laboratory for performing the chemical analyses and the metallography. J.R. McDermid and W.T. Thompson acknowledge the Natural Sciences and Engineering Research Council of Canada (NSERC) for financial support of this work.

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Authors and Affiliations

  1. Department of Mechanical Engineering, McMaster University, Hamilton, ON, Canada, L8S 4L7

    J.R. McDermid (Associate Professor)

  2. Department of Chemistry and Chemical Engineering, Royal Military College of Canada, Kingston, ON, Canada, K7K 7B4

    M.H. Kaye (Research Associate) & W.T. Thompson (Professor)

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  1. J.R. McDermid
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  2. M.H. Kaye
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  3. W.T. Thompson
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Correspondence to J.R. McDermid.

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Manuscript submitted January 22, 2006.

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McDermid, J., Kaye, M. & Thompson, W. Fe Solubility in the Zn-Rich Corner of the Zn-Al-Fe System for Use in Continuous Galvanizing and Galvannealing. Metall Mater Trans B 38, 215–230 (2007). https://doi.org/10.1007/s11663-007-9028-3

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