Combating Corrosion Degradation of Turbine Materials Using HVOF Sprayed 25% (Cr₃C₂-25(Ni20Cr)) + NiCrAlY Coating

Figure 6

Macrographs of uncoated substrates (top row, in sequence for Ti-31, Superco-605, and MDN-121) and 25% (Cr₃C₂-25(Ni20Cr)) + NiCrAlY coating (bottom row, in sequence for Ti-31, Superco-605, and MDN-121) subjected to hot corrosion in Na₂SO₄-50%V₂O₅ environment at 800°C for 50 cycles.

(a)

(b)