A series of H and D permeation experiments was performed for ferritic F82H steel, with and without a ceramic coating of Cr2O3–SiO2 including CrPO4. Firstly, experiments were performed on the permeability of F82H steel without coatings at 300 to 600C in an atmosphere of 100 to 1000Pa of H and D. The measured values of diffusion coefficient, permeability and solubility were in good agreement with those published previously. Next, experiments were performed on the permeability of F82H steel with a coating at 400–600C in an atmosphere of 1000–1500Pa of D, and the permeation reduction factor of the coating was determined. The obtained permeation reduction factor at 600C was about 400, which was of the same order of magnitude as the permeation reduction factor value of about 1000 previously evaluated for the same coating on an SS316 substrate. A significant decrease in the permeation reduction factor (down to about 4%) was observed, when the sample temperature was lowered from 600 to 400C.

Investigation of Hydrogen Isotope Permeation through F82H Steel with and without a Ceramic Coating of Cr2O3–SiO2 Including CrPO4 (Out-of-Pile Tests). T.V.Kulsartov, K.Hayashi, M.Nakamichi, S.E.Afanasyev, V.P.Shestakov, Y.V.Chikhray, E.A.Kenzhin, A.N.Kolbaenkov: Fusion Engineering and Design, 2006, 81[1-7], 701-5