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金属陶瓷金属相优先腐蚀是目前惰性阳极工业化难点之一,在金属相表面包覆NiFe2O4尖晶石来提高其耐高温熔盐腐蚀性能。包覆实验结果显示,包覆后的颗粒尺寸为2～5μm,且有团聚现象,金属相20Ni-80Cu表面除形成NiFe2O4尖晶石外,可能还含有NiFe2O4-x、Cu2O、NiO、CuxNi1-x、NiyFe1-yFe2O4-a和NizFe1-zO。腐蚀实验表明,金属表面包覆10%、20%、30%、40%和50%NiFe2O4尖晶石后制备的金属陶瓷惰性阳极样品其金属腐蚀层厚度都在20～50μm,其年腐蚀率分别为1.89、1.73、1.65、1.58和2.03cm/a,未包覆金属陶瓷惰性阳极金属腐蚀层厚度为200μm和年腐蚀率为4.15cm/a,说明金属表面包覆NiFe2O4尖晶石能提高惰性阳极的抗熔盐腐蚀性能。
Preferential corrosion of cermet metal phase is one of the difficulties in the industrialization of inert anode. The surface of metal phase is coated with NiFe2O4 spinel to improve the corrosion resistance of high temperature molten salt. The results of the coating experiments show that the size of the coated particles is 2 ~ 5μm and the agglomeration occurs. The surface of the metal phase 20Ni-80Cu may also contain NiFe2O4-x, Cu2O, NiO, CuxNi1-x , NiyFe1-yFe2O4-a and NizFe1-zO. The results of corrosion test show that the corrosion rate of the cermets on the metal anode coated with 10%, 20%, 30%, 40% and 50% NiFe2O4 spinel is 20 ~ 50μm, 1.89,1.73,1.65,1.58 and 2.03cm / a. The thickness of non-coated cermet inert anode metal corrosion layer is 200μm and the annual corrosion rate is 4.15cm / a, indicating that the metal surface coating NiFe2O4 spinel can improve the inert anode Resistance to molten salt corrosion.