Hot Corrosion Behaviour of Detonation Gun Sprayed Stellite-6 and Stellite-21 Coating on Boiler Steel SAE 431 at 900°C

Figure 3

SEM micrographs of (a) SAE 431 boiler steel, (b) Stellite-21 coated SAE 431 boiler steel, and (c) Stellite-6 coated SAE 431 boiler steel subjected to Na₂SO₄-82%Fe₂(SO₄)₃ at 900°C for 50 cycles.

(a)

(b)

(c)