Hydrogen gas driven permeation through vanadium alloy VCr6Ti5

• Published in: Journal of nuclear materials 1996-10, Vol.233, p.376-380
• Main Authors: Romanenko, O.G., Tazhibaeva, I.L., Shestakov, V.P., Klepikov, A.Kh, Chikhray, Y.V., Golossanov, A.V., Kolbasov, B.N.
• Format: Article
• Language: English
• ISSN: 0022-3115; 1873-4820
• DOI: 10.1016/S0022-3115(96)00034-7

Hydrogen gas driven permeation experiments were conducted with the vanadium alloy VCr6Ti5 in the temperature range 423–1073 K and input pressures 10 2–10 3 Pa. Hydrogen permeation through this material was shown to be limited by surface processes and permeated fluxes to be proportional to input pressures P more than P 1 2 , in indicated ranges of temperatures and pressures. Sticking, ( S), recombination coefficients, ( b), and solubility constants, ( C S), in VCr6Ti5 have been extracted from the permeation experiments in the frame of a hydrogen permeation model, being limited by adsorption and desorption processes: ▪; ▪. These values do not agree very well with the literature data obtained for other vanadium alloys. Thus, for more correct determination of these values, the experimental results must be probably processed taking into consideration the rate constants of transfers from surface into the bulk and emergence from the bulk onto the surface.