Research on the contributions of corrosion, erosion and synergy to the erosion–corrosion degradation of Ti(C,N)–based cermets

• Dynamic environment significantly enhances binder corrosion.
• Contributions of corrosion, erosion and synergy are environment dependent.
• Contribution of synergy has enhanced with increased environmental corrosivity.
• Erosion role has increased and corrosion role has decreased with the increased time.
• Corrosion enhanced erosion plays a dominant part in the synergy.

In the paper, the contributions of corrosion, erosion and synergy to the erosion–corrosion degradation of Ti(C,N)–based cermets are investigated in the different slurry conditions, and respect to the synergistic effect, corrosion enhanced erosion and erosion enhanced corrosion are also quantified. The results indicate that the contributions of corrosion, erosion and synergy to the erosion–corrosion degradation of Ti(C,N)–Ni cermets are strongly environment dependent. With increasing the environmental corrosivity, the contributions of corrosion and synergy are enhanced, and the erosion role in erosion–corrosion is strengthened significantly with the increased erosion severity. With the increased time, the erosion role is increased and the corrosion role is decreased in the erosion–corrosion conditions. Corrosion enhanced erosion and erosion enhanced corrosion have both increased with the increased time, however the increment of corrosion enhanced erosion is much more than that of erosion enhanced corrosion. Corrosion enhanced erosion is more significant than erosion enhanced corrosion, and corrosion enhanced erosion plays a dominant role in the synergy.