Na和铝电解质对振动成型TiB_2惰性阴极的渗透

Penetration of Sodium and Electrolyte into Vibratory Compaction TiB_2 Cathode

采用振动成型的TiB2和石墨分别作为Na和铝电解质渗透实验的阴极材料,在工业铝电解条件下电解5h,考察了Na和铝电解质对其腐蚀渗透情况.XRD分析结果表明,振动成型TiB2阴极的基体中未发现Na或F的单质及化合物,而在石墨阴极中则有NaF和Na3AlF6等物质存在.SEM及EDS分析结果表明,Na,F,Al等元素渗透到TiB2阴极基体中的量极少,渗透到石墨中的量则较多.可见振动成型TiB2阴极能够有效减缓Na和铝电解质的渗透,但并不能完全阻止.

The penetration of sodium and electrolyte into the vibratory compaction TiB2 material and graphite material used as cathode of aluminum electrolysis was studied in this work. After 5 h electrolysis, the XRD analysis showed that NaF and Na3AIF6 existed in the graphite cathode, but NaF and Na3A1F6 were not found in the graphite of vibratory compaction TiB2 cathode. The SEM analysis showed that Na, F and AI penetrated slightly into the vibratory compaction TiB2 cathode, much less than that penetrated into the graphite cathode. Vibratory compaction TiB2 cathode can decrease sodium penetration effectively, but can not hinder sodium penetration thoroughly.