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[en] Fundamental knowledge about the deterioration of structural materials in the presence of liquid lead (Pb), Lead Bismuth Eutectic (LBE) and eutectic Pb–Li is essential for the construction and safe operation of fission and fusion reactors to be built in the near future as well as industrial-scale fast neutron reactors in the long term. Given that the structural materials are metallic, i.e. steels, elements of the solid metal will dissolve in the liquid metal, depending on the liquid metal chemistry. Depending on whether this mass transfer affects the metallic elements in proportion to their concentration in the solid material or is selective for specific constituents, the result is either a recession of the material surface or development of a near-surface depletion zone. Both reduce the thickness of the cross section capable of bearing the mechanical load acting on the material and may compromise other functions the material needs to fulfil as part of its service in the plant. Furthermore, a liquid metal in immediate contact may cause weakening of a solid metallic material beyond the thinning of the cross section that resulted from dissolution. A prominent example is the so-called Liquid Metal Embrittlement (LME) that occurs for specific combinations of liquid metal and solid metallic material, especially at low temperature and simultaneous action of mechanic stress in the solid material.