Hot Corrosion Behavior of HVOF (Cr₃C₂ + 25NiCrAlY) and PVD (CrN) Coating on a Waspaloy Nickel-Base Superalloy in 60%V₂O₅ + 30%Na₂SO₄ + 10% NaCl Environment: A Comparative Study

In this study, two coatings, one produced by HVOF spraying, the other by physical vapor deposition (PVD), were applied on a nickel superalloy substrate in order to compare their hot corrosion behavior. The coating samples were initially characterized by OM and SEM-EDS analysis, then a mixture of V₂O₅, Na₂SO₄, and NaCl was deposited on the surface and the samples were to 900 °C for 35 h. The results show that the PVD CrN coating provided better corrosion protection than HVOF-sprayed CrC-NiCrAlY.