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Electrochemical corrosion of silicon carbide ceramics in sodium hydroxide

: Herrmann, M.; Sempf, K.; Wendrock, H; Schneider, M.; Kremmer, K.; Michaelis, A.


Journal of the European Ceramic Society 34 (2014), Nr.7, S.1687-1693
ISSN: 0955-2219
Fraunhofer IKTS ()

Sintered silicon carbide ceramics have found widespread use due to their high corrosion stability. This corrosion stability can be affected by electrochem. processes. Electrochem. corrosion expts. conducted on an SSiC material in NaOH at different voltages and subsequent detailed investigation of the formed surfaces were carried out. Systematic local measurement of the corrosion rate was carried out using the AFM technique. The results revealed the recession of the SiC grain surfaces under anodic electrochem. loading, with the extents differing strongly from grain to grain. The recession rates were not found to correlate with the SiC grain orientations or polytypes. Rather, the data and the obsd. microstructure indicated that the behavior was caused by variations in the resistivities of the grain boundaries.