Modelling of hydrogen diffusion in a steel containing micro-porosity. Application to the permeation experiment. (30th April 2023)

• Record Type: Journal Article
• Authors: Yaktiti, A.; Dreano, A.; Gass, R.; Yvert, T.; Carton, J.F.; Christien, F.
• Is Part Of: International journal of hydrogen energy. Volume 48:Number 37(2023)
• Page Start: 14079
• Page End: 14094
• Publication Date: 2023-04-30
• Subjects: Hydrogen diffusion and trapping -- Void -- Micro-porosity -- Modelling -- FEM -- Permeation; Hydrogen as fuel -- Periodicals; Hydrogène (Combustible) -- Périodiques; Hydrogen as fuel; Periodicals; 665.81
• DOI: 10.1016/j.ijhydene.2022.12.208
• Languages: English
• ISSNs: 0360-3199

Abstract

Abstract: 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. Graphical abstract: Image 1 Highlights: 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.