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研究了Fe-Al合金在500℃空气中ZnCl_2-KCl盐膜下的腐蚀行为。结果表明,与无盐膜氧化实验相比,合金在盐膜下发生了加速腐蚀,表面生成了疏松多孔的腐蚀产物,基体产生内腐蚀,其中Fe-25Al合金表面氧化铝膜甚至发生退化。合金加速腐蚀是由于腐蚀过程中氯化物沉积盐与合金表面的氧化膜反应产生氯所致。腐蚀随合金中Al含量的增加而减轻。基于热力学相图预测了合金在盐膜下可能发生的反应,并解释了合金发生加速腐蚀的机制。
The corrosion behavior of Fe-Al alloy under ZnCl_2-KCl salt solution in air at 500 ℃ was studied. The results show that compared with the experiment of salt-free film oxidation, the alloy accelerates corrosion under the salt film, and the porous and corrosive products are formed on the surface, and the matrix is internally corroded, and the surface of the alumina film on the Fe-25Al alloy is even degraded. Accelerated corrosion of the alloy is due to the corrosion of chloride deposition salt and the alloy surface oxide film reaction caused by chlorine. Corrosion decreases with increasing Al content in the alloy. Based on the thermodynamic phase diagram, the possible reaction of the alloy under the salt film was predicted and the mechanism of accelerated corrosion of the alloy was explained.