STUDY OF IMPROVING CORROSION RESISTANCE OF TIB_2-BASED INERT CATHODE

Sample of compact TiB 2-MoSi 2 inert cathode is prepared by cold-pressing and sintering.After electrolysis test,electron microscpe analysis is made for the surface and section of the cathode.It is found that the wettability of the cathode to aluminum is better then that to electrolyte and the contact of cathode surface with electrolyte is eliminated.The fact that the corrosion of the inert cathode is that of electrolyte to the grain boundary is also found.The corrosion speed of 2 22 mm/a was measured.Good corrosion resistance of the cathode was demonstrated.