Abstract
A tritium permeation barrier can be prepared on the surface of structural materials to effectively inhibit tritium penetration and leakage. In this study, an Al2O3/SiO2 composite tritium permeation barrier was prepared on the inner wall of a 316L stainless steel tube via the slurry method. The microstructure and phase composition of the coatings were investigated by using SEM, XRD, TEM, and XPS. The thermal shock resistance and hydrogen resistance of the coating were studied. Results show that the coating is continuous and dense, and is composed of Al2O3 and amorphous SiO2. The thickness of the coating is approximately 80 μm and well attaches to the substrate. Compared with thermal shock at 700 °C, the coating exhibits better thermal shock resistance at 500 °C and 600 °C. The Al2O3/SiO2 composite coating has good phase stability after thermal shock. Electrochemical hydrogen permeation tests demonstrate that the Al2O3/SiO2 composite coating effectively improves the hydrogen resistance of the 316L stainless steel substrate.
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