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2006
Journal Article
Titel
Electrochemical corrosion testing of solid state sintered silicon carbide in acidic and alkaline environments
Abstract
Solid state sintered silicon carbide ceramics are used in aggressive environments as sealings. There exist data concerning corrosion, but there are only few data concerning their electrocorrosion behaviour. Therefore the electrochemical corrosion of solid state sintered silicon carbide (SSiC) ceramics has been studied at room temperature in acidic and alkaline environments by using potentiodynamic polarization measurements, The investigation showed a pronounced electrochemical corrosion in bases and acids. in HCl and HNO3 pseudo-passivity features due to the formation of a thin layer of SiO2 on the surface were observed, whereas in NaOH soluble silicate ions were observed, resulting in more pronounced corrosion. The microstructural observations of initial and corroded samples reveal that the residual carbon found in the microstructure do not dissolve preferentially.