Critical wetting point in the liquid lead-molten alkali metal halogenide system

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Abstract

Experimental data on the surface tension of liquid lead and molten sodium, potassium, and cesium halogenides at the interface with the gaseous phase along with the values of interfacial tension between them formed the basis for analyzing the phase transition of surface wetting in two-phase high-temperature systems. The dependence of the work of adhesion of the molted salt to the metal on temperature and nature of contacting phases is established. Conditions of transition from partial wetting of the metal surface by molted salt to the film mode are found.

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About the authors

V. P. Stepanov

Institute of High Temperature Electrochemistry, Ural Branch of the Russian Academy of Sciences

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Email: v.stepanov@ihte.ru
Russian Federation, Ekaterinburg

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2. Fig. 1. Interfacial tension of lead in halide melts as a function of temperature.

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3. Fig. 2. Dependence of interfacial tension at the boundary of lead with molten salt at 1100 K on the size of the cation (from left to right: Na+, K+, Cs+).

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4. Fig. 3. Work of adhesion of alkali metal halide melts to liquid lead as a function of temperature.

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5. Fig. 4. The work of adhesion between liquid lead and melts of sodium, potassium and cesium halides depending on the sum of polarizabilities of the ions of the salt phase at 1100 K.

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6. Fig. 5. The spreading rate of molten salt on the surface of liquid lead as a function of temperature

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