1. Electrode’s bad quality. 2. Higher temperature(in electrolytic cell). 3. Higher current denstity on titanium anode and voltage in electrolytic cell. 4. Too much Fluoride Ions in Electrolyte(more than 200ppm). 5. Reverse the polarity. 6. Short-circuit on titanium anode. 7. Damages(frictions or collisions) to the Ru-Ir coating. 8. Faults on the choices of MMO coating, etc. |