摘要
研究了在SrCl2-SrF2-BaF2的电解质体系中熔盐电解法制备高浓度Al-Sr合金,采用连续脉冲-计算机法测定电解过程的反电动势并且对反电动势和电流效率的影响因素进行了详细的研究。结果发现:增加阴极电流密度,反电动势随之增加;升高极距,反电动势亦有所增加。延长电解时间,反电动势逐渐升高而电流效率达到73.2%后逐渐下降。加大电流强度,延长电解时间,减少铝基母合金质量,可制得高浓度的Al-Sr合金,合金中锶的质量分数最高可达34.8%。实验表明,只要控制好各项工艺参数,可以生产锶的质量分数在20%以内的任意浓度Al-Sr合金。
Al-Sr alloy was prepared by molten salt electrolysis in electrolyte system of SrCl2-SrF2-BaF2. Back electromotive force was measured by continuous pulse-computer and the influencing factors for back electromotive force and current efficiency were studied in detail. The result was as follows: the back electromotive force increased with the cathodic current density increasing; when the electrode distance enlarged, the back electromotive force also increased in a little; with the increase of electrolysis duration, the back electromotive force increased gradually whereas the current efficiency decreased gradually after reaching 73.2 %. With increase of electrolysis duration, of current intensity and lowering the amount of aluminium master alloy, a high strontium content of 34.8% (mass fraction) in Al-Sr alloy can be obtained. It was indicared that Al-Sr alloy with strontium content less than 20% can be obtained under the condition of each process parameter controlled well.
出处
《稀有金属》
EI
CAS
CSCD
北大核心
2007年第4期577-580,共4页
Chinese Journal of Rare Metals
基金
国家高技术研究发展项目(2001AA335010)资助
关键词
熔盐电解
铝锶合金
锶浓度
反电动势
molten salt electrolysis
Al-Sr alloy
strontium content
back electromotive force