Fig. 1: Schematic representation of hydrogen permeation from hydrogen enriched atmosphere through barrier to the EUROFER97 adapted from figures by Rönnebro et al.4 and Pundt and Kirchheim 200641; Li et al.42.
From: Hydrogen diffusion and trapping in a cryogenic processed high-Cr ferrous alloy

The factors indicated on the figure influence hydrogen permeation. These factors are impurities (point a), traps (points b and c), grain boundaries (point d), dislocations (point e) and vacancies (point f).