HIGH-TEMPERATURE ELECTROCHEMICAL SYNTHESIS AND PROPERTIES OF INTERMETALLIC COMPOUNDS OF THE NI-SC SYSTEM .3. SYNTHESIS OF INTERMETALLIC COMPOUNDS OF THE NI-SC SYSTEM IN MOLTEN-SALTS BY CURRENTLESS TRANSFER .4.ELECTROCHEMICAL SYNTHESIS OF THE INTERMETALLIC COMPOUNDS OF THE NI-SCSYSTEM

The formation mechanism of the Ni-Sc intermetallic compounds (IMCs) in molten salts by currentless transfer is discussed. It is shown that t his mechanism is typical for the alloy-formation process involving ele ctronegative metals having no cations of low oxidation state. The infl uence of several parameters of the currentless transfer (temperature, process duration, size of scandium metal surface in contact with the e lectrolyte) on the kinetics of the alloy-formation and the phase compo sition of the IMC layers has been studied. An electrochemical synthesi s of Ni-Sc intermetallic compounds was performed. Some details of this process are discussed. The parameters of the solid state interdiffusi on are estimated using chronopotentiometry data.