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Direct observation of individual hydrogen atoms at trapping sites in a ferritic steel

2017; American Association for the Advancement of Science; Volume: 355; Issue: 6330 Linguagem: Inglês

10.1126/science.aal2418

1095-9203

Yi‐Sheng Chen, Daniel Haley, Stephan Gerstl, Andrew London, F. Sweeney, Roger Wepf, W.M. Rainforth, Paul A.J. Bagot, Michael P. Moody,

Corrosion Behavior and Inhibition

Heavy hydrogen gets frozen in place Hydrogen embrittlement contributes to the failure of steel in a wide variety of everyday applications. Various strategies to mitigate hydrogen embrittlement, such as adding carbides into the steel, are hard to validate because we are unable to map the hydrogen atoms. Chen et al. combined fluxing steel samples with deuterium and a cryogenic transfer protocol to minimize hydrogen diffusion, allowing for detailed structural analysis (see the Perspective by Cairney). Their findings revealed hydrogen trapped in the cores of the carbide precipitates. The technique will be applicable to a wide range of problems, including corrosion, catalysis, and hydrogen storage. Science , this issue p. 1196 ; see also p. 1128