Evaluation of the Optimal Y Content for the FeCrAl Coating with Excellent LBE Corrosion Resistance
JOURNAL OF NUCLEAR MATERIALS(2024)
摘要
FeCrAlY coating with excellent LBE corrosion resistance is considered one of the most important candidate corrosion-resistant coatings in LFRs. However, the critical Y content required to obtain excellent comprehensive properties and the influence of varying Y content on corrosion resistance is still unknown. In this study, FeCrAl coatings with Y content from 0.5 - 5 wt.% were corroded at 500 - 600 °C for 1000 h in static LBE. All the coatings can provide efficient protection for the substrate from LBE corrosion. The FeCrAl0.5Y coating has the best corrosion resistance (with an oxide scale thickness of only ∼ 61 nm), and the increased Y content leads to deteriorated performance. A three-layered corrosion layer formed on the surface of the coatings and the Y element is only distributed in the middle and innermost layers. The corrosion mechanism was discussed and a corrosion model was put forward. The outstanding corrosion resistance of the FeCrAl0.5Y coating makes it possible to have the prospect of practical application in LFRs.
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关键词
LBE,FeCrAlY coating,Corrosion resistance,Magnetron sputtering
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