【摘要】 采用浸没法研究了TiAl 5Nb金属间化合物在熔融LiCl- Li2 O中的热腐蚀行为。TiAl- 5Nb在75 0℃熔融LiCl- Li2 O中的抗腐蚀性能优于SS310不锈钢。TiAl- 5Nb在腐蚀初期出现了较快的腐蚀,而后其腐蚀速率减慢并趋于平缓。TiAl -5Nb经熔融LiCl -Li2 O腐蚀后,形成了双层结构的腐蚀膜:外层较厚由γLiAlO2 晶粒构成,内层较薄由Ti的氧化物(Li2 -TiO3 ,TiO2 )构成。γLiAlO2 的快速生长导致了TiAl 5Nb腐蚀初期的快速腐蚀,而腐蚀后期较慢的腐蚀速率归因于Ti的氧化物构成的内层具有较好的保护性。更多还原

【Abstract】 The hot corrosion behavior of TiAl-5Nb intermetallics in molten LiCl-Li 2O wa s investigated by immersion experiment. TiAl-5Nb showed much better corrosion r esistance than SS310 stainless steel in molten LiCl-Li 2O at 750 ℃. In molte n LiCl-Li 2O, TiAl-5Nb alloy exhibited a fast corrosion at the initial stage of corrosion, and then the corrosion stabilized as a slow corrosion rate. The co rrosion scale showed a bilayered structure: the thicker outer layer was composed of grains of γ-LiAlO 2, whereas the thinner inner layer was a compact ti tanium oxide-rich (Li 2TiO 3, TiO 2) layer. The fast corrosion at the beginn ing of corrosion was due to the fast growth of γ-LiAlO 2, and the slower corrosion rate at the latter stage of corrosion was owing to the formation of pr otective inner layer of titanium oxides.更多还原