Abstract
Passivation treatments in NaOH, H2SO4 and HCl were conducted in order to improve the oxidation resistance of Ti3SiC2 at 500°C. The oxidation resistance of Ti3SiC2 passivated in NaOH was the greatest of any treatments due to the formation of an amorphous film during passivation treatment, which became dense, crystalline and seemingly highly protective during oxidation. The detrimental phase transformation of TiO2 was limited by doping with SiO2. Different levels of corrosion happened during passivation treatment in H2SO4 and HCl, which is harmful to oxidation resistance.
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Acknowledgements
This work was supported by the National Natural Science Foundation of China (grant no. 91226202).