Corrosion protection of MgO electrodes at 1400 °C |
| |
Authors: | RK Sauerbrey G Mori H Harmuth |
| |
Affiliation: | a Technology Center, RHI AG, Chemistry Department, Magnesitstraße 2, 8700 Leoben, Austria b CD-Laboratory of Localized Corrosion, University of Leoben, Franz-Josef-Straße 18, 8700 Leoben, Austria c University of Leoben, Peter-Tunner-Straße 5, 8700 Leoben, Austria |
| |
Abstract: | MgO-electrodes were polarised at voltages of up to 10 V in a synthetic lime-alumina-silicate slag at 1400 °C. Cathodic corrosion protection was obtained at voltages ?8 V, whereas anodic decay was accelerated manifold. The protective effect was mainly achieved by electrostatic alteration of the slag composition at the electrode boundary. This was primarily caused by the rapid migration of mobile Ca2+-ions and their accumulation at the slag/electrode interface. Consequently, the saturation concentration of CaO in the melt was reached and the precipitation of the CaO-containing phases merwinite, melilite and dicalciumsilicate occurred. |
| |
Keywords: | A Ceramic electrodes B Potentiostatic polarisation B Cathodic protection |
本文献已被 ScienceDirect 等数据库收录! |
|