Abstract：Four binderless TiCN-based cermets TiC0.4N0.6, TiC0.7N0.3, TiC0.7N0.3-29WC-12TaC and TiC0.7N0.3-29WC- 12TaC-2Mo2C with a relative density greater than 98.5% were prepared by spark plasma sintering (SPS). Scanning electron microscopy SEM observation shows that the average grain size of binderless TiC0.4N0.6 is substantially larger than that of other three groups. Electrochemical corrosion behaviors of binderless TiCN-based cermets in 0.1 mol/L NaOH solution were investigated by potentiodynamic polarization curve and electrochemical impedance spectroscopy. The results show that the corrosion resistance of the cermets in NaOH solution follows the following order, i.e., TiC0.7N0.3>TiC0.7N0.3- 29WC-12TaC>TiC0.7N0.3-29WC-12TaC-2Mo2C>TiC0.4N0.6. The increase of nitrogen and the addition of metal carbides are detrimental to the corrosion resistance of cermets. The oxidation product formed during the corrosion process can act as a passivation film, which results in a pseudo-passivation phenomenon. Binderless TiC0.7N0.3 cermet has the highest relative densification (99.5%) and the best corrosion resistance.
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2019, Vol. 24 
