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本文采用循环伏安法和计时电流法研究了直接电解生产含锆和稀土的耐热电工铝合金的电化学过程。结果表明,冰晶石熔体中,锆在石墨电极上的还原过程是可逆的,该过程分两步进行,每步均转移两个电子,其还原电位分别为-0.7V和-1.1V。铈在石墨电极上的还原过程是不可逆的,该过程也分两步进行,其还原电位为-0.3V和-1.2V。锆和铈在石墨电极上的共析过程中,锆和铈的还原过程互不影响,可以在一定的还原电位下共同还原。
In this paper, cyclic voltammetry and chronoamperometry were used to study the electrochemical process of direct electrolysis for the production of heat-resisting aluminum alloy containing zirconium and rare earth. The results show that the reduction of zirconium in graphite cryolite is reversible. The process proceeds in two steps with two electrons transferred at each step, and the reduction potentials are -0.7V and -1.1V respectively. The reduction of cerium on the graphite electrode is irreversible and the process is also carried out in two steps with reduction potentials of -0.3V and -1.2V. During the eutectoid process of zirconium and cerium on the graphite electrode, the reduction of zirconium and cerium do not affect each other and can be reduced together under a certain reduction potential.