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Ferritic/martensitic steels, such as T91 steel and SIMP steel, are chosen as the main candidates structural materials for the Generation Ⅳ lead-cooled fast reactors and accelerator driven system (ADS). However, the compatibility between container steel and liquid Pb-Bi eutectic (LBE) at high temperature limits their application. The corrosion of ferritic/martensitic steels is serious in LBE at 600℃. In order to avoid the corrosion of ferritic/martensitic steels in LBE, it is proposed to prepare AlO x(x x  coating was prepared on T91 steel and SIMP steel by magnetron sputtering. In this exploratory work, the corrosion results of AlO x  coating steel was compared with the corrosion results of the uncoated steel in LBE with saturated oxygen concentration at 600℃ for 300 h and 700 h. The results show that the AlO x coating can effectively prevent the diffusion of iron chromium and oxygen, so the oxide scale of the coated steel is thinner than that of the uncoated steel. However, the coating cracks after 700 hours of corrosion in LBE. Meanwhile, T91 steel and SIMP steel also suffered serious oxidative corrosion, indicating that the coating can protect the substrate from 600℃ static LBE in a short time. However, the coating cannot remain stable for a long time in LBE at 600℃. This may be due to the weak film base bonding force of AlO x  coating prepared under the experimental conditions, or there are a large number of metal aluminum and structural defects in AlO x coating. It needs further study on the stability of AlO x  coating in LBE at elevated temperature.

wuli xuebao

Stability and corrosion behavior of AlO&lt;sub&gt;&lt;i&gt;x&lt;/i&gt;&lt;/sub&gt; coating on T91 steel and SIMP steel in static liquid Pb-Bi eutectic at 600 ℃