This work aims to explore a method for preparing the surface coating of FeCrAl alloy,a cladding material in nuclear power industry.The Al2O3-TiO2 coating with FeCrAl as the intermediate layer was prepared on FeCrAl alloy by multi-arc ion plating.The thermal-shock test was carried out to explore the thermal-shock resistance of the coating.The corrosion resistance of the coating was studied after the static lead-bismuth eutectic(LBE)corrosion test at 600 ℃ for 1000 h.The phase composition and micromorphologies of substrate and coating samples before and after LBE corrosion were characterized.The results showed that the Al2O3-TiO2 prepared by multi-arc ion plating was amorphous.After 30 thermal shock tests,the coating did not crack or fall off.After the corrosion,the surface of FeCrAl substrate showed obvious dissolution corrosion.GIXRD results showed that Al2O3 crystallization occurred in the coating samples after corrosion.The Al2O3 structure on the surface shrank and pores appeared,while the inner layer of the coating remained dense.The sectional analysis showed that LBE did not penetrate into the coating.Therefore,the Al2O3-TiO2/FeCrAl coating can effectively protect the substrate from LBE corrosion.
FeCrAl alloyMulti-arc ion platingAl2O3-TiO2/FeCrAl coatingThermal-shock resistanceLead-bismuth eutectic(LBE)corrosion
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