Surface-limited permeation regime in the study of hydrogen interactions with metals

Quantitative and Qualitative Analysis of Hydrogen Accumulation in Hydrogen-Storage Materials Using Hydrogen Extraction in an Inert Atmosphere

“…After analyzing the curve obtained by thermal desorption spectroscopy of zirconium alloy (Figure 1a), we established that the optimal step was 100 °C corresponding to 60 A. Analysis of previous works [53][54][55][56][57][58] demonstrated that the first peak of titanium alloy hydrogen desorption is observed at 600 °C. This temperature corresponds to the phase boundary between phases δ and β + δ.…”

“…With a linear heating of 6 °C/min, the decrease in intensity of titanium hydride reflections began at 520 °C. At 530 °C, these reflections disappeared almost completely, and hydrogen desorption began Analysis of previous works [53][54][55][56][57][58] demonstrated that the first peak of titanium alloy hydrogen desorption is observed at 600 • C. This temperature corresponds to the phase boundary between phases δ and β + δ. Hence, during this TPD step, dissociation of hydrides occurs.…”

Engineering design of a Permeator Against Vacuum mock-up with niobium membrane

“…Therefore, if W <<1 the regime can be considered surfacelimited, whereas a W >>1 implies that the permeation is completely diffusion-driven. An exhaustive explanation on the permeation parameter is reported in [28]. The values used for the evaluation of W are reported in Table 3.…”

“…[26][27][28].The hydrogen concentration along the LiPb flow direction in the PAV channels is evaluated with a transport model. The pressure gradient between the inner side of the pipes (Nb membrane), where LiPb flows, and the outer side (the vessel) drives the tritium permeation across the pipe wall together with the surface phenomena.…”