Modelling of hydrogen diffusion in a steel containing micro-porosity. Application to the permeation experiment

• Published in: International journal of hydrogen energy Vol. 48; no. 37; pp. 14079 - 14094
• Main Authors: Yaktiti, A., Dreano, A., Gass, R., Yvert, T., Carton, J.F., Christien, F.
• Format: Journal Article
• Language: English
• Published: Elsevier Ltd 30.04.2023
• Subjects: FEM; Hydrogen diffusion and trapping; Micro-porosity; Modelling; Permeation; Void; Hydrogen diffusion and trapping; Modelling; Void; Permeation; Micro-porosity; FEM
• ISSN: 0360-3199; 1879-3487
• DOI: 10.1016/j.ijhydene.2022.12.208

Two numerical models based on non-equilibrium and local equilibrium approaches respectively were developed to simulate hydrogen transport in porous metals, taking account of gaseous hydrogen trapping inside the micro-porosities. They were applied to the case of hydrogen permeation in a cast steel at room temperature. Numerical simulations revealed that the two models are equivalent under certain conditions. A parametric analysis was performed to explore the effect of external hydrogen fugacity, hydrogen solubility and porosity fraction on the hydrogen diffusion behavior. A comparison between experimental permeation data and the numerical results showed reasonable agreement considering no input parameter was adjusted. [Display omitted] •Hydrogen diffusion in a metal containing micro-porosity is modelled.•Trapping of gaseous hydrogen inside the porosity is considered.•Two different approaches: non-equilibrium and local equilibrium.•Non equilibrium approach based on reaction flux at the metal – porosity interface.•Comparison to the permeation experimental data.