Steels under hydrogen – limits of strength and role of protective coatings (HYDSTREN)

Chemical energy carriers are indispensable for achieving decarbonization of the economy. Hydrogen is particularly suitable here due to its high gravimetric energy density. However, the mechanical properties of many materials are negatively affected by hydrogen. Especially in the strength range above 1000 MPa, a significant loss of strength is possible for steels. This strength range, however, is particularly relevant for mobile and stationary energy systems with compressed hydrogen or also corrosion-induced hydrogen.

In cooperation with Kompetenzzentrum Mittelstand GmbH (KME) and the project partners iwis mobility systems, LSV Lech-Stahl Veredelung, Richard Bergner Verbindungstechnik (RIBE), Scherdel INNOTEC Forschungs- und Entwicklungs-GmbH, Brose Fahrzeugteile and DILO, metallic materials are to be investigated for their tendency to hydrogen embrittlement. Hydrogen will be introduced into the material electrolytically on the one hand, and via a newly developed high-pressure hydrogen charging system on the other. This is followed by a characterization of the mechanical properties by means of static tensile tests, fatigue tests and scanning electromicroscopic investigations. The results will be compared with the hydrogen-free state in order to draw conclusions about the failure mechanisms. In the further course of the project, methods will be found to prevent hydrogen-induced damage. A development of a material system of the strength class 1200 MPa to 1500 MPa is aimed. Another possibility for damage prevention is the use of protective coatings that effectively prevent critical hydrogen input into the base material. This will also be investigated as part of this project.

The HydStren project is coordinated and financed by KME.#