TiB2镀层制备及其耐腐蚀性能研究

介绍了采用K2TiF6-KBF4-KF-KCl-LiF熔盐体系在石墨基体上电沉积制备TiB2镀层的工艺方法,其电解质组成(质量分数,%)为K2TiF615,KBF424,KF48,KCl 8,LiF5,电沉积温度为820℃,电沉积时间为3 h,电流密度为0.7 A/cm2.将所制TiB2镀层作为铝电解实验的阴极,在工业铝电解条件下电解4 h,考察了Na和铝电解质对其腐蚀渗透情况.SEM分析结果表明,Na,F,Al等元素渗透到TiB2镀层的石墨基体中的量很少,而由XRD分析结果可知TiB2镀层的石墨基体中有少量的NaF晶体等,可见TiB2镀层未完全阻止Na的渗透,但却在一定程度上减缓了其渗透速率...

Preparation of TiB2 Coating and Its Corrosion Resistance to Electrolyte

TiB2 coating was electrodeposited on graphite substrate from K2TiF6-KBF4-KF-KCl-LiF molten salts at 820°C for 3 hr with a current density 0.7 A/cm², of which the composition of the electrolyte used is 15 K2TiF6, 24 KBF4, 48KF, 8KCl, 5LiF in wt%. The penetration of sodium and electrolyte into the TiB2 coating used as cathode of aluminum electrolysis was studied. After electrolysis for 4 hr, the SEM analysis showed that Na, F and Al penetrated slightly into the TiB2 coating, and XRD pattern showed that there is a little NaF in the graphite substrate. Compared with graphite cathode, TiB2 coating can slow up. sodium formation and decelerate sodium penetration, but can not hinder sodium from penetration thoroughly.