Oxidation behavior of a Ti₂AlNb based alloy (Ti–22Al–23Nb (at.%)) and hot corrosion behavior of this alloy coated with a salt mixture of NaCl–Na₂SO₄ at 1023 K were comparatively investigated. The results showed that the alloy possessed relatively good oxidation resistance while suffered severe hot corrosion attack. The mass gain of the hot-corroded alloy was much larger than that of the oxidized alloy. The oxide scale was mainly composed of TiO₂. During the oxidation, the oxide scale could keep intact. In the corrosion product scale, TiO₂ + Al₂O₃ layers and NaNbO₃ layers existed alternately and Al₂O₃ was distributed in the lower parts of the TiO₂ + Al₂O₃ layers. The formation of the TiO₂ + Al₂O₃ layer and the NaNbO₃ layer should promote each other by altering the acidity/basicity of the salt film, and thus the growth of the scale was accelerated. The escape of the gaseous chlorides, the fast growth of the scale and the coefficient of thermal expansion (CTE) mismatch between TiO₂ and NaNbO₃ resulted in serious cracking and spalling of the scale.

比较研究了Ti ₂ AlNb基合金（Ti–22Al–23Nb（at。％））的氧化行为和涂有NaCl–Na ₂ SO ₄盐混合物的合金在1023 K时的热腐蚀行为。结果表明，该合金具有较好的抗氧化性，同时受到严重的热腐蚀侵害。热腐蚀合金的质量增益远大于氧化合金的质量增益。氧化皮主要由TiO ₂组成。在氧化过程中，氧化皮可以保持完整。在腐蚀产物尺度上，TiO ₂  + Al ₂ O ₃层和NaNbO ₃层交替存在，而Al ₂ O₃分布在TiO ₂  + Al ₂ O ₃层的下部。TiO ₂  + Al ₂ O ₃层和NaNbO ₃层的形成应通过改变盐膜的酸度/碱性来相互促进，从而促进水垢的生长。气态氯化物的逸出，水垢的快速生长以及TiO ₂和NaNbO ₃之间的热膨胀系数（CTE）不匹配导致水垢严重破裂和剥落。