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Electrode reactions of various electric conductive materials in some molten glasses

Journal of Non-Crystalline Solids
Publication Date
DOI: 10.1016/0022-3093(80)90443-3


Abstract Anodic dissolution, passivation and cathodic deposition of electric conductive materials were investigated by linear potential sweep method in molten glasses. Na 2O·2B 2O 3 and F8 lead glass were selected as sample glasses. As the electrodes, the materials such as Pt, Ni, Fe, Mo, graphite and stannic oxide were selected. Some examples of the results obtained in Na 2O·2B 2O 3 at 900°C by anodic polarization are summarized as follows: By anodic potential sweep of the Pt electrode, S-shape current-potential curves are obtained. This limiting current may be attributed to the diffusion current of oxygen ions. By applying more anodic potential than about 3V the oxygen gas evolution is observed. Pt acts as an insoluble electrode. The Ni electrode readily dissolves as soon as the potential is applied, but the dissolution current decreases by further anodic polarization because of the oxide film formed by Ni + O 2− = NiO + 2 ρ on the electrode surface. There are no any peak on the current-potential curves for Fe and W electrodes. Fe and W readily dissolve. The order of increase of electrolytic current density at 3V in Na 2O·2B 2O 3 is: W > Fe ⪢ Mo > Co > Ni > Cr ⋍ graphite ⋍ Pt > stannic oxide .

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