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 Al2O3-TiO2 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 degrees C. For comparison, an AlOx coating is also evaluated under static conditions. The results show that the Al2O3-TiO2 coating exhibits superior corrosion resistance and structural stability compared with AlOx 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 Al2O3-TiO2 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.