Metallurgical and Materials Transactions B

, Volume 38, Issue 2, pp 215–230 | Cite as

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

Article
First Online:

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.

Keywords

Intermetallic Particle Excess Gibbs Energy Solubility Curve Experimental Solubility Data Partial Excess Gibbs Energy 
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.

Table of Symbols

GE

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

Xi

mole fraction of component i

δSS

delta solid solution

εA−B

interaction coefficient of component B on A

ηSS

eta solid solution

γi

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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Notes

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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Copyright information

© THE MINERALS, METALS & MATERIALS SOCIETY and ASM INTERNATIONAL 2007

Authors and Affiliations

  1. 1.Department of Mechanical EngineeringMcMaster UniversityHamiltonCanada
  2. 2.Department of Chemistry and Chemical EngineeringRoyal Military College of CanadaKingstonCanada

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