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研究了 Fe-Al,Fe-Cr 合金在800℃,900℃和950℃SO_2气氛中的高温腐蚀行为。用石英弹簧检测试样腐蚀增重,以测定高温腐蚀动力学。用 SEM,EMP 和 X 射线衍射分析腐蚀产物。本研究中的 Fe-Al,Fe-Cr 合金腐蚀初期同时硫化/氧化,其中硫化物成为金属离子快速扩散的途径。腐蚀产物膜生长到一定厚度后,扩散到表面的合金元素及铁的浓度降低到只有铁的氧化物在腐蚀产物表面生成。同时 SO_2分子通过腐蚀产物向合金内部扩散,造成材料的内硫化/氧化。
The high temperature corrosion behavior of Fe-Al and Fe-Cr alloys in SO_2 atmosphere at 800 ℃, 900 ℃ and 950 ℃ was studied. Quartz spring corrosion test sample weight gain to determine the high temperature corrosion kinetics. Corrosion products were analyzed by SEM, EMP and X-ray diffraction. In the present study, the initial corrosion of Fe-Al and Fe-Cr alloys was simultaneously sulfidized / oxidized, and sulfides became the way of rapid diffusion of metal ions. After the growth of the corrosion product film to a certain thickness, alloying elements and iron diffused to the surface are reduced in concentration to the extent that only iron oxide is generated on the surface of the corrosion product. At the same time, SO 2 molecules diffuse into the alloy through corrosion products, resulting in internal sulfidation / oxidation of the material.