Application of Electric Voltages for Improved Protection of MgO Refractory Materials
1 CD-Laboratory of Localized Corrosion, University of Leoben, 8700 Leoben, Austria
2 Technology Center, RHI AG, 8700 Leoben, Austria
Volume 2, Issue 1, Pages 105 - 110
MgO electrodes were polarized at voltages of up to 10 V in a synthetic lime-alumina-silicate slag at 1400 °C and at 5 A in syntheticfayalite slag at 1250 °C. Cathodic corrosion protection was obtained in both cases, requiring voltages of min. 8 V and approx. 1 V, respectively. Protection was achieved through rapid migration of mobile Ca2+ ions and their accumulation at the slag/electrode interface in the first case and the electrochemical reduction of FeO in the latter case.
ceramic electrodes, polarization, cathodic corrosion protection
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