Corrosion Behaviour of a Cr₂O₃ Coating on Mild Steel in Synthetic Mine Water

Figure 3

SEM-BSE micrographs showing the morphologies of (a) mild steel substrate-NiCrAlY bond-Cr₂O₃ top coating system; (b) NiCrAlY bond-Cr₂O₃ top coating system with pores, cracks, and unmelted particles; (c) Cr₂O₃ top coating, showing splats; and (d) mild steel substrate, showing ferrite and pearlite [26].

(a)

(b)

(c)

(d)