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MM: Fachverband Metall- und Materialphysik
MM 16: Poster Ia
MM 16.13: Poster
Montag, 18. März 2024, 18:30–20:30, Poster E
Electrochemical study of Hydrogen Embrittlement in Al-Si coated stainless steels — •Neil Reon Mathias1, Alisa Svirina2, Sebastian Pentz1, and Ferdinand Haider1 — 1Chair for Experimental Physics I, University of Augsburg, Universitätsstraße 1, 86159 Augsburg (Germany) — 2Institute de Mécanique et Ingéniere, Université de Bordeaux (France)
There is a compelling business case for optimizing stainless steels for usage in hydrogen storage tanks. One method of reducing the penetration of hydrogen and accordingly the embrittlement of stainless steels is by coating it using the hot-dip process, which forms a layer of Al-Si on the surface to mitigate the embrittlement process. This study performs electrochemically controlled hydrogen permeation on different coated and uncoated stainless steels using a Devanathan-Stachurski cell to understand the nature of protection offered by these coatings. A set of commercial-grade austenitic, ferritic, duplex, and hot-dipped stainless steels are investigated for changes in their microstructure and fracture behaviour at room temperature. Evolution of trapped hydrogen is measured through thermal desorption spectroscopy to validate the electrochemical measurements. The hot-dip coating seems to reduce the hydrogen permeation considerably, thereby resulting in less hydrogen embrittlement compared to uncoated stainless steels. Microstructural changes indicate that the uncoated stainless steels show greater degree of intergranular fracture compared to the coated stainless steels. Tensile test results demonstrate the increased elongation of coated stainless steels in comparison to their uncoated counterparts.
Keywords: Hydrogen Embrittlement; Steel; Devanathan-Stachurski cell; coating