Ti_3Al金属间化合物在熔融LiCl-Li_2O中的热腐蚀行为  

Hot Corrosion Behavior of Ti_3Al Intermetallics in LiCl-Li_2O Molten Salt

作　　者：屈献永[1] 王旭[1] 张俊善[1] 王秀敏[1] 祝美丽[1] 

机构地区：[1]大连理工大学材料工程系,辽宁大连116024

出　　处：《机械工程材料》2006年第3期54-56,70,共4页Materials For Mechanical Engineering

摘　　要：采用浸没法研究了Ti_3Al金属间化合物在750℃熔融LiCl-3%Li_2O中的热腐蚀行为。结果表明：Ti_3Al的耐腐蚀性能优于SS310不锈钢。Ti_3Al在腐蚀初期出现了较快的腐蚀,而后腐蚀速率减慢并趋于平缓。Ti_3Al经腐蚀后,形成了双层结构的腐蚀膜,外层较厚,由铝的氧化物(LiAlO_2,Al_2O_3)构成；内层较薄,由钛的氧化物(Li_2 TiO_3,TiO_2)构成。铝的选择氧化导致了Ti_3Al腐蚀初期快速腐蚀,而腐蚀后期腐蚀速率较慢是由于钛的氧化物构成的内层具有较好的保护性。The hot corrosion behavior of Ti3 At intermetallics in molten LiCl-Li2O was investigated with immersion experiment. Tia A1 showed much better corrosion resistance than 310SS stainless steel in molten LiCl-3 Li2O at 750℃. In molten LiCl-3%Li2O, Ti3Al exhibited a fast corrosion at the initial stage of corrosion, and then kept a steady state with a slow corrosion rate. The corrosion scale showed a bilayered structure of a thicker outer layer of aluminum oxides （LiAlO2, Al2O3） and a thinner compact inner layer of titanium oxides （Li2TiO3, TiO2）. The fast corrosion in the beginning of corrosion was due to the selective oxidation of Al, and the slower corrosion rate at the latter stage of corrosion was owing to the formation of protective inner layer of titanium oxides.

关 键 词：Ti3Al金属间化合物 熔融 LiCl-Li2O 腐蚀 

分 类 号：TG178[金属学及工艺—金属表面处理]