中文摘要：

在1023 K条件下,开展了Zr（Ⅳ）在KCl-MgCl2-K2ZrF6和KCl-MgCl2-K2ZrF6-KF-ZrO2熔盐中Mo电极上的电化学实验,并获得如下结果：Zr（Ⅳ）还原为Zr（O）是通过两步反应,即Zr（Ⅳ）＋2e→Zr（Ⅱ）和Zr（Ⅱ）＋2e→Zr（0）。两个反应是准可逆的。KCl-MgCl2-K2ZrF6-KF-ZrO2熔盐中的电极反应表明在预沉积的Zr上欠电位沉积Mg可以用来制备Mg-Zr合金。感应耦合离体子体-原子发射光谱（ICP-AES）分析结果表明,在1023 K和KCl-MgCl2-K2ZrF6-KF-ZrO2熔盐中K2ZrF6含量在9.2%（w）条件下,恒电流电解获得的Mg-Zr合金中Zr含量可以达到7.2%（W）。并采用X射线衍射（XRD）和扫描电镜-能谱仪（SEM-EPS）对合金进行表征。利用KCl、MgCl2、K2ZrF6、KF和ZrO2为原料,直接恒电流电解制备Mg-Zr合金是可行的,且在确定反应条件下实现合金中Zr含量可控;揭示了KCl-MgCl2熔盐体系可以实现Mg和Zr的共电沉积,并且验证了直接电解ZrO2获得Mg-Zr合金的可行性。

英文摘要：

To investigate the electrochemical co-reduction mechanism associated with the formation of Mg- Zr alloys, the electrochemical behaviors of Zr（IV） in KCI-MgCl2-K2ZrFB and KCI-MgCl2-K2ZrF6-KF-ZrO2 melts were studied on a molybdenum electrode at 1023 K. Cyclic voltammograms （CVs） and square-wave voltammograms （SWVs） showed that Zr（IV） was reduced to Zr metal by a two-step mechanism consisting of the Zr（IV）/Zr（II） and Zr（II）/Zr（O） pairs in the KCI-MgCl2-K2ZrF6 melt. The dissolution of ZrO2 in the KCI-MgCl2-K2ZrF6-KF melt was ascertained from CVs, while the Zr（IV） concentration in the melt was assessed by inductively coupled plasma atomic emission spectrometry （ICP-AES）. Mg-Zr alloys were obtained by galvanostatic electrolysis in KCI-MgCl2- K2ZrF6-KF-ZrO2 melts and subsequently characterized by X-ray diffraction （XRD） and scanning electron microscopy-energy dispersive spectroscopy （SEM-EDS）. The Zr concentrations in the alloys as determined by ICP-AES were as high as 7.2% （w）. The formation of Mg-Zr alloys could be controlled by varying both the reaction time and the melt composition. These results confirm the feasibility of the direct electrolysis of ZrO2 to obtain Mg-Zr alloys in KCI-MgCl2-K2ZrF6-KF-ZrO2 melts.