Internal Nitridation of Ni-Based Alloys during High-Temperature Corrosion by Nitrogen

Nitridation of Ni-based alloys may occur when the protective oxide layer loses its effectiveness because of pores, cracks, or spalling. Components under high thermal or mechanical loading are especially prone to such damages. Nitrogen causes internal corrosion by chemical reaction with alloying elements like Ti and Al, commonly present in commercial Ni-based alloys. The mechanism and kinetics of the internal nitridation is discussed by the authors.