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探索了在Li F-KCl-Sc F3体系中电解制备Al-Mg-Sc合金的工艺过程,重点考察电势、电流效率及钪析出量的变化趋向。研究表明,电势随电流强度的变大呈升高趋势;加料前后电势降低约0.37V;温度由750℃升高到800℃时,反电动势从3.98V降至3.06V;电流效率随着电流强度和实验温度的增加先升高再降低,最佳实验温度为790℃;添加1wt%Sc2O3得到的加料周期是13min;在780℃、3.5A的条件下电解120min可获得钪含量为0.59%的三元合金,效率达72.1%。
The process of electrolytic preparation of Al-Mg-Sc alloy in Li F-KCl-Sc F3 system was explored. The trend of potential, current efficiency and the amount of scandium precipitated were investigated. The results show that the potential increases with the increase of current intensity, the potential decreases about 0.37V before and after feeding, and decreases from 3.98V to 3.06V when the temperature rises from 750 ℃ to 800 ℃. The current efficiency decreases with the increase of amperage And the increase of the experimental temperature first increased and then decreased. The optimum experimental temperature was 790 ℃. The addition of 1wt% Sc2O3 was 13min. The electrolysis at 780 ℃ and 3.5A for 120min yielded the tris Yuan alloy, the efficiency of 72.1%.