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Study on the Corrosion Resistance of Slag α-Sialon Ceramics to NaOH and HNO3

The corrosion resistance of slag α-Sialon ceramics, prepared via pressure-less sintering and hot-pressing from slag α-Sialon powder, to NaOH and HNO3 was studied in this work. The result shows that slag α-Sialon ceramics have exellent corrosion resistance to NaOH and good resistance to HNO3. The corrosion mechanism and corrosion mode of acid and alkali to slag α-Sialon ceramics was investigated by means of scanning electron microscopy (SEM), and the results indicate that the corrosion of acid and alkali to hot-pressing ceramic is the slow surface corrosion, not only on the crystal grains, but also on the grain boundary phase, while the fast pitting is the dominant corrosion mode for pressure-less ceramic. The corrosion of NaOH solution to ceramics mainly occurred the grain boundary phase, while not only the grain boundary phase, but also crystal phase are corroded by HNO3.