Corrosion Behavior of Ceramics-Coated Hastelloy-XR Alloy in an Ar-SO₂ Atmosphere

Abstract

Glass lining and CVD (chemical vapor deposition) YSZ (yttria stabilized zirconia) coating were applied to improve the corrosion resistance of Hastelloy-XR alloy in an Ar–SO₂ atmosphere (P_SO2=10 kPa). A glass lining with the composition of 48 SiO₂–8 B₂O₃–6 Al₂O₃–11 CaO–25 BaO–2 ZnO (mass%) which protected the alloy substrate showed almost no crystallization and mass change below 1073 K, but suffered degradation at temperatures over 1173 K. The YSZ (8 mol% Y₂O₃) coating had a well-grown columnar structure and showed excellent corrosion resistance at 1273 K.