Superior corrosion resistance and structural stability of Al2O3–TiO2 coating on FeCrAlY alloy in static and flowing LBE

Alumina-based coatings are promising candidates to protect structural materials from lead-bismuth eutectic (LBE) corrosion in advanced nuclear systems. In this study, an Al 2 O 3 -TiO 2 coating is deposited on FeCrAlY alloy by multi-arc ion plating, and its corrosion behavior was systematically investigated under both static and flowing LBE at 550 °C. For comparison, an AlO x coating is also evaluated under static conditions. The results show that the Al 2 O 3 -TiO 2 coating exhibits superior corrosion resistance and structural stability compared with AlO x coating. This performance is attributed to its amorphous-nanocrystalline structure, which not only improves toughness but also maintains high compositional uniformity and microstructural stability during long-term LBE exposure. Overall, the Al 2 O 3 -TiO 2 coating shows excellent structure stability and mechanical properties, enabling it to remain intact even under harsh flowing LBE environments, underscoring its potential for advanced reactor applications.