各種水溶液中におけるRuO₂被覆チタン電極のアノード特性

抄録

The use of RuO₂ coated titanium electrode as an insoluble anode for cathodic protection in sea water has been investigated. Electrodes were prepared by the thermal decomposition of RuCl₃ on titanium supports. The anodic polarization curves for RuO₂ electrodes were determined in NaCl, Na₂SO₄ solutions, and artificial sea water. Experiments by constant-current electrolysis and SEM observation were also conducted. A characteristic refractive point was observed on anodic polarization curves in Cl^- containing dilute solutions because oxygen over-voltage is much lower than that of Pt, etc. During constant-current electrolysis, RuO₂ electrode was corroded at high current density (ex. 40A/dm²). This phenomenon is assumed that RuO₂ coating layer became unstable due to the rise of electrode potential.