Hot Corrosion Behaviour of Detonation Gun Sprayed Al₂O₃-40TiO₂ Coating on Nickel Based Superalloys at 900°C

Figure 4

SEM micrographs of (a) Al₂O₃-40TiO₂ coated Superni 718 (b) Al₂O₃-40TiO₂ coated AE 435 (c) Superni 718 (d) AE 435 superalloys subjected to Na₂SO₄-82%Fe₂(SO₄)₃ at 900°C for 50 cycles.

(a)

(b)

(c)

(d)