Back to Search
Start Over
Electrochemical corrosion of silicon carbide ceramics in H2SO4
- Source :
- Journal of the European Ceramic Society. 34:229-235
- Publication Year :
- 2014
- Publisher :
- Elsevier BV, 2014.
-
Abstract
- Sintered silicon carbide materials have found widespread use due to their high corrosion stability. This corrosion stability can be affected by electrochemical processes. Electrochemical corrosion experiments conducted on a SSiC material in H 2 SO 4 at different voltages and subsequent detailed investigation of the formed surfaces was carried out. The first time a systematic local measurement of the thickness of the oxide layers was carried out. The measurements revealed the formation of SiO 2 surface layers with thickness up to 125 μm. The measured values also showed a strong deviation from grain to grain. The thickness of the layers does not correlate with the crystallographic orientation of the grains or the SiC-polytypes. The data indicate that the behaviour is caused by the variation of the resistivity of the grain boundaries. The measured thicknesses as a function of the electrical charge transferred indicate that the electrochemical oxidation results in the SiO 2 and carbon dioxide.
Details
- ISSN :
- 09552219
- Volume :
- 34
- Database :
- OpenAIRE
- Journal :
- Journal of the European Ceramic Society
- Accession number :
- edsair.doi...........3e5b8ac270d27b608d4df83ccc72b15a