Abstract
The electrolytic behavior of molten glass is important to understand its ionic behavior and is also essential to control an electric melting furnace. The present investigation was undertaken to obtain the fundamental electrolytic behavior of various glass melts composed of mined network-forming oxides such as borosilicate, phosphoaluminate, boroaluminate, phosphoborate and aluminosilicate. Besides the potential sweep voltammetry, decomposition voltages were determined from stationary current-potential curves. The elemental compositions of the Pt electrode-glass interface after polarization were analyzed by EPMA. Decomposition voltages at 900°C were determined as follows; 25Na2O⋅25B2O3⋅50SiO2: 1.46V, 40Na2O⋅20Al2O3⋅40P2O5: 1.05V, 40Na2O⋅30Al2O3⋅30B2O3: 1.19V, 40Na2O⋅30B2O3⋅30P2O5: 1.02V, The value in 26Na2O⋅19CaO⋅8Al2O3⋅47SiO2 was 0.96V at 1200°C. The network-forming or conditional ions were reduced at different potentials and the order subject to reduction was confirmed to be (easy) P5+>Al3+>Si4+>B3+ (difficult). The decomposition potentials of these ions were tentatively estimated to be P5+: -0.7V, Al3+: -0.85V, Si4+: -1.1V, B3+: -1.2--1.4V with respect to the electrode potential of the Pt reference immersed in the respective molten sample glass. On the Pt anode, oxygen anions were oxidized resulting in oxygen gas evolution.
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