Hydrogen Impact: A Review on Diffusibility, Embrittlement Mechanisms, and Characterization

Area of Science:

• Materials Science
• Metallurgy
• Corrosion Science

Background:

• Hydrogen embrittlement (HE) is a critical failure mechanism in metallic materials exposed to hydrogen.
• Unmanaged HE can lead to catastrophic failures in hydrogen-containing vessels like pipelines and storage tanks.
• HE degrades mechanical properties such as ductility, toughness, and strength through hydrogen-metal defect interactions.

Purpose of the Study:

• To review the fundamental mechanisms of hydrogen embrittlement.
• To elucidate hydrogen diffusion behavior in metallic materials.
• To summarize characterization techniques used to study HE.

Main Methods:

• Review of existing literature on hydrogen embrittlement.
• Analysis of phenomena including hydrogen adsorption, diffusion, and interaction with trapping sites (dislocations, voids, grain boundaries, interfaces).
• Compilation of common testing techniques: tensile, double cantilever beam, bent beam, and fatigue tests.

Main Results:

• HE involves complex interactions between hydrogen and material defects.
• Hydrogen adsorption, diffusion, and trapping at various sites are key to HE.
• Multiple testing methods exist to characterize HE, each with specific applications.

Conclusions:

• A thorough understanding of HE mechanisms and hydrogen diffusion is crucial for developing effective hydrogen resistance strategies.
• Continued research into HE is essential for ensuring the safety and integrity of hydrogen-dependent infrastructure.
• Characterization techniques provide vital data for material selection and performance prediction in hydrogen environments.