Ti3Al金属间化合物在熔融LiCl-Li2O中的热腐蚀行为
Hot Corrosion Behavior of Ti3Al Intermetallics in LiCl-Li2O Molten Salt
摘 要
采用浸没法研究了Ti3Al金属间化合物在750℃熔融LiCl-3%Li2O中的热腐蚀行为.结果表明：Ti3Al的耐腐蚀性能优于SS310不锈钢.Ti3Al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.Ti3Al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(LiAlO2,Al2O3)构成；内层较薄,由钛的氧化物 (Li2TiO3,TiO2)构成.铝的选择氧化导致了Ti3Al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.
熔融
LiCl-Li2O
腐蚀
Ti3Al intermetallics
molten
LiCL-Li2O
corrosion
Abstract
The hot corrosion behavior of Ti3Al intermetallics in molten LiCl-Li2O was investigated with immersion experiment.Ti3Al 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.
中图分类号 TG178
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收稿日期 2004/12/19
修改稿日期 2005/3/1
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备注屈献永(1981-),男,河南新乡人,硕士研究生.
引用该论文: QU Xian-yong,WANG Xu,ZHANG Jun-shan,WANG Xiu-min,ZHU Mei-li. Hot Corrosion Behavior of Ti3Al Intermetallics in LiCl-Li2O Molten Salt[J]. Materials for mechancial engineering, 2006, 30(3): 54～56
屈献永,王旭,张俊善,王秀敏,祝美丽. Ti3Al金属间化合物在熔融LiCl-Li2O中的热腐蚀行为[J]. 机械工程材料, 2006, 30(3): 54～56
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参考文献
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【3】Cho S H,Zhang J S,Shins P K,et al.A study on the corrosion behavior austenitic stainless steel in hot molten salt of LiCl and LiCl-Li2O [J].Korean Journal of Mater Research,1999,9(2):211-216.
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【5】谢锡善.我国高温材料的应用与发展[J].机械工程材料,2004,28(1):2-8.
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