Abstract
Aluminum rich coatings forming Al2O3 on surface are widely applied as tritium permeation barrier (TPB) on structural materials in fusion reactor. In this work, we proposed a new three-step method for preparing such aluminum rich coating on HR-2 steel: ambient temperature melts salt electroplating followed by heat treating and artificial oxidation at 700°C. Al deposition from AlCl3/EMIC was performed with a deposition rate of 15μm/h. After heat treated for 2h, the aluminized coating appeared homogeneous, with thickness of 11–13μm and free of visible porosity, and exhibited a three-layer structure. After oxidized in 10−2Pa O2 for 80h, the finally fabricated coating showed a double-layered structure consisting of an outer γ-A12O3 layer with thickness of 0.1μm and inner (Fe,Cr,Mn,Ni)Al/(Fe,Cr,Mn,Ni)3Al layer of 32μm thickness, without any visible defects. The deuterium permeation rate through the coated HR-2 steel was reduced by 2–3 orders of magnitude at 600–727°C.
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