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10242 Al-Based Barrier Development for Nuclear Fusion Applications

Picture for 10242 Al-Based Barrier Development for Nuclear Fusion Applications
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Product Number: 51300-10242-SG
ISBN: 10242 2010 CP
Author: Juergen Konys, Wolfgang Krauss and Nils Holstein
Publication Date: 2010
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In the HCLL (He-cooled Lithium-lead) design of TBM’s (Test Blanket Modules) for a future fusion power plant, Pb-15.7Li is used as liquid breeder which is in direct contact with the structure material, e.g. EUROFER steel (European ferritic steel). Compatibility testing showed that high corrosion attack appears and that the dissolved steel components form precipitates with a high risk of system blockages. A reliable operation needs coatings as corrosion barriers.

An earlier developed Hot-Dip Aluminization (HDA) process has shown that Al-based scales can act as anti-corrosion as well as tritium (T) permeation barriers. However, disadvantages of HDA-process initiated the search for advanced coating technologies. Meanwhile two electro-chemically based processes for deposition of Al scales were successfully developed. The first (ECA = Electro-Chemical Al-deposition) is working with an organic electrolyte and the second one (ECX = Electro-Chemical Xmetal deposition) is based on ionic liquids and is not restricted to only Al-deposition. Coatings in the µm-range were deposited homogeneously with exact controllable thicknesses. Metallurgical investigations and SEM/EDX-analyses showed the successful generation of protective scales and compatibility testing demonstrated the barrier function in Pb-15.7Li.

Key words: Pb-Li corrosion, chemical compatibility, anti corrosion barriers, tritium permeation barriers, Al coating development, electrochemical Al Voltammetrie
In the HCLL (He-cooled Lithium-lead) design of TBM’s (Test Blanket Modules) for a future fusion power plant, Pb-15.7Li is used as liquid breeder which is in direct contact with the structure material, e.g. EUROFER steel (European ferritic steel). Compatibility testing showed that high corrosion attack appears and that the dissolved steel components form precipitates with a high risk of system blockages. A reliable operation needs coatings as corrosion barriers.

An earlier developed Hot-Dip Aluminization (HDA) process has shown that Al-based scales can act as anti-corrosion as well as tritium (T) permeation barriers. However, disadvantages of HDA-process initiated the search for advanced coating technologies. Meanwhile two electro-chemically based processes for deposition of Al scales were successfully developed. The first (ECA = Electro-Chemical Al-deposition) is working with an organic electrolyte and the second one (ECX = Electro-Chemical Xmetal deposition) is based on ionic liquids and is not restricted to only Al-deposition. Coatings in the µm-range were deposited homogeneously with exact controllable thicknesses. Metallurgical investigations and SEM/EDX-analyses showed the successful generation of protective scales and compatibility testing demonstrated the barrier function in Pb-15.7Li.

Key words: Pb-Li corrosion, chemical compatibility, anti corrosion barriers, tritium permeation barriers, Al coating development, electrochemical Al Voltammetrie
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