Chemical and structural durability of α-Al2O3 and γ-LiAlO2 layers formed on ODS FeCrAl alloys in liquid lithium lead stirred flow

The protection performance of an α-Al 2 O 3 layer formed on oxide dispersion-strengthened (ODS) FeCrAl alloys in liquid LiPb flow was investigated by means of the corrosion tests under stirred-flow condition at 873 K for 1000 h. The result of STEM/EELS analysis indicated the Li adsorption and diffusion into α-Al 2 O 3 layer. The ODS FeCrAl alloys in-situ formed a durable γ-LiAlO 2 layer on their bare surface in liquid LiPb. The results of micro scratch tests on the protective layers indicated that they revealed strong resistance against the exfoliation in a shearing direction after the immersion to liquid LiPb. • Protection performance of α-Al 2 O 3 layer in liquid LiPb stirred flow at 873 K. • STEM/EELS analysis to clarify Li diffusion in α-Al 2 O 3 layer. • In-situ formation of durable α-/γ-LiAlO 2 layer in liquid LiPb stirred flow at 873 K. • Scratch tests to clarify adhesion condition of Al-rich oxide layers after immersion to liquid LiPb. • Possible exfoliation mechanism of protecting layers during use in liquid LiPb.