Fe25Cr20Ni合金在H<sub>2</sub>S-H<sub>2</sub>中的高温硫化行为

Fe25Cr20Ni合金在H₂S-H₂中的高温硫化行为

摘要: 使用连续称重装置和非连续称重装置对Fe25Cr20Ni合金在H₂S-H₂气氛中的高温硫化行为进行了研究。结果表明:这种合金的硫化行为遵循抛物线规律,腐蚀产物有3层:最外层(称OL-Ⅱ层)由Fe-Ni-S系统组成;中间层(称OL-Ⅰ层)由Fe-Cr-S系统组成;内硫化层(Subscale)由一些弥散的硫化物相组成,标记实验的结果表明:合金在硫化过程中,腐蚀产物最外两层的生长是由金属离子向外扩散控制,而内硫化层的生长是由分解机理控制。

Abstract: The sulfidation kinetics of Fe25Cr20Ni were cairied out at H₂S-H₂ atmospheres by means of continuously-weighing device and non-continuously weighing device. Sulfidation kinetics curves of the alloy obeys parabolic law.The composition and morphology of sulfide scales were also studied. All sulfide scales consist of two surface layers in addition to subscale. Two surface layers are controlled by predominant diffusion of metals. The subscale growth is controlled by the inward diffusion of suffur.