Reminders of FPH mechanisms
Mechanical behaviour of metallic materials for transport and storage of gaseous hydrogen

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Reminders of FPH mechanisms
Mechanical behaviour of metallic materials for transport and storage of gaseous hydrogen

Author : Laurent BRIOTTET

Publication date: June 10, 2022 | Lire en français

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2. Reminders of FPH mechanisms

Degradation of the mechanical properties of metallic materials in the presence of hydrogen gas begins with a dissociative adsorption phase: before penetrating the metal, the dihydrogen molecule adsorbs and then dissociates on the surface of the sample. Each H then binds chemically to the metal atoms and diffuses into the volume.

2.1 Surface phenomena (dissociative adsorption)

Figure 6 shows the main steps classically presented to describe the penetration of H into metal. Initially (step 1 in figure 6), a H2 molecule will adsorb to the surface by Van der Waals forces. This molecule will be able to migrate across the surface...

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