PSI - Issue 14

7

Author name / Structural Integrity Procedia 00 (2018) 000–000

S.M. Muthu et al. / Procedia Structural Integrity 14 (2019) 290–303

296

Fig 3: XRD analysis of hot corroded superalloy Inconel 825 after exposure to molten salt of Na 2 SO 4 -60% V 2 O 5 environment at 900°C. (a) Uncoated 825; (b) Ni-20%Cr Coated 825.

An irregular rough surface morphology was observed on the Ni-20%Cr coated superalloy after exposed with molten salt which is displayed in Fig. 5. The EDS analysis revealed that the surface of the coated superalloy is rich in Ni, Cr and O. This indicates the presence of NiO and Cr 2 O 3 layers. Other corrosive elements such as Na and V are observed on the top scale. A minor amount of Fe was observed.