Acid corrosion, silicon nitride ceramic

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K. Kanbara, N. Uchida, K. Uematsu, T. Kurita, K. Yoshimoto and Y. Suzuki, Corrosion of Silicon Nitride Ceramics by Nitric Acid , Mat. Res. Soc. Symp. Proc., 287, 1993, 533-538. 

As a future alternative to glassed steel there is ceramics-coated steel which is resistant to abrasion, corrosion and high temperatures. The base metal is coated with silicon nitride formed in situ. Silicon nitride has resistance to both acid and alkali and it is durable at temperatures up to 1 000°C, suggesting a promising future coating in aggressive operating environments. 

Silicon nitride-based ceramics are promising engineering materials for application under corrosive and wear conditions [135-142]. However, the use of silicon nitride materials in hot acids under hydrothermal conditions and in bases is often limited by degradation of the materials. This is the impetus for current efforts for better understanding of the influence of the microstructure on the corrosion behaviour of silicon nitride materials and to improve the materials behaviour on its basis. Up to now, only a small amount of data about the mechanisms of corrosion and pitting formation exists. 

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