日本金属学会誌

J. Japan Inst. Metals, Vol. 56, No. 7 (1992),
pp. 779-784

Activity of Zinc in Molten Gold and Gold-Copper Alloy

Shigeaki Sugino1, Takashi Hori1 and Hisato Hagiwara1

1College of Engineering, University of Osaka Prefecture, Sakai

Abstract:

The activities of Zn in dilute solution with molten Au and Au-Cu alloy have been measured by the use of an isopiestic method at 1423 K, and the first and second order interaction parameters between Zn and Cu in molten Au have been determined.
Additions of Cu to Au-Zn binary alloy increase the activity of Zn. The activities of Zn in the Au-Cu-Zn ternary molten alloys are well expressed by Wagner's relation taken into account the second order terms, in the composition range NZn+NCu≤0.10. It has been demonstrated that the quadratic formalism proposed by Darken is valid for this system in the composition range, NCu≤0.08 and NZn<0.07.
Activity coefficient of Zn at infinite dilution of Zn in Au-Cu binary solvent varies with NAu/NCu smoothly, and seems to be qualitatively in accordance with the prediction from the equation formulated by Richardson.


(Received 1992/02/17)

Keywords:

activity of zinc, dilute solution, gold-zinc alloy, gold-copper-zinc alloy, interaction parameter, isopiestic method, vapor pressure of zinc


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