熔盐电解制备Mg-Zn-Sr三元合金及其组织分析

Research on preparation and microstructures of Mg-Zn-Sr ternary alloys by molten-salt electrolysis

以Mg-33%Zn(质量分数)合金为阴极,石墨为阳极,在740℃的KCl-SrCl2熔盐体系中进行液态阴极合金化法电解,并在670℃浇铸反应液制备Mg-ZnSr合金。浇铸产物车削加工后取样,分别进行X射线荧光分析(XRF)、金相分析(OM)、扫描电镜形貌分析(SEM)、能谱分析(EDS)及X射线衍射分析(XRD),并与阴极合金组织进行比较。结果表明,实验成功制备了Mg-Zn-Sr三元合金,Sr的质量分数为1.6279%,且Sr细化了阴极合金的组织。对比熔炼制备的MgZn-Sr合金组织,电解的Sr具有更好的细化效果。

Using Mg-33wt%Zn alloys as the cathode,graphite as anooe, to conduct electrolysis by liquid cathode alloying in KCl-SrCl2 melts at 740 ℃ ,and casting the reaction liquid at 670 ℃ to prepare the Mg-Zn-Sr alloys. After cutting the casting product into standard specimens, the samples were analyzed by means of X-ray fluores- cence, optical micrograph （OM）, scanning electron microscopy （SEM）, energy dispersive spectrometry （EDS） and X-ray diffraction（XRD）,and compared with the cathode alloys. The results show that the reaction prepared Mg-Zn-Sr ternary alloys successfully, the mass fraction of Sr was 1. 6279%,and Sr refine the cathode alloys. Compared to the microstructures of molten Mg-Zn-Sr alloys,and found that the electrolytic Sr can refine micro- structures better.