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铁道科学与工程学报

JOURNAL OF RAILWAY SCIENCE AND ENGINEERING

Vol. 17    No. 3    June 2007

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Dissolution mechanism of solid nickel in liquid zinc saturated with Fe
KONG Gang(孔 纲), LU Jin-tang(卢锦堂), XU Qiao-yu(许乔瑜)

School of Materials Science and Engineering, South China University of Technology, Guangzhou 510640, China

Abstract:The dissolution behavior of solid nickel in static liquid zinc saturated with Fe at 723 K was studied. The results show that when immersing solid Ni in liquid Zn saturated with Fe, the intermetallic compound layers consisted of γ and δ phases are formed on nickel substrate, which is the same as that in liquid pure zinc. However, some Γ2 particles are formed in the liquid near the solid/liquid interface. These Γ2 particles can easily heterogeneously nucleate on ζ particles and grow fast. The dissolution process is governed by diffusion of nickel atom across a concentration boundary layer in liquid Zn saturated with Fe, and is different from a mixed control mechanism of nickel in liquid pure zinc. The participation of Γ2 particles makes the dissolution of solid Ni in the liquid accelerated.

 

Key words: solid nickel; liquid zinc; dissolution mechanism

ISSN 1672-7029
CN 43-1423/U

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