Hydrogen permeation in 2205 duplex stainless steel under hydrostatic pressure and simulation by COMSOL

This article explores the effect of hydrostatic pressure on hydrogen diffusion process in 2205 duplex stainless steel. The experiments were performed in a homemade high pressure autoclave. The Fick's second law was modified and taken reversible traps into account. The apparent diffusion coefficient decreased by 74.85% when pressure increased from 0.1 to 7 MPa, both of forward and reverse trapping rate constants, apparent hydrogen concentration, and activation energy increased with higher hydrostatic pressure. Additionally, finite element method based on diffusion model was performed using COMSOL Multiphysics software and the trapping constants effects were analyzed, which can be used in ocean industry.