摘要
本文使用连续称重装置和非连续称重装置对Fe25Cr20Ni2.4Si合金在H_2S-H_2气氛中的高温硫化行为进行了研究。结果表明:这种合金的硫化动力学行为遵循抛物线规律。腐蚀产物有三层: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,腐蚀产物的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。
The sulfidation kinetics of Fe25Cr20Ni2.4Si were carried out at H2S-H2 atmospheres by means of continuously-weighing device and non-conti-nuously 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 predominante diffusion of metals. The subscale grow is controlled by the inward diffusion of sulfur.
出处
《北京科技大学学报》
EI
CAS
CSCD
北大核心
1990年第2期137-141,共5页
Journal of University of Science and Technology Beijing
关键词
铁基合金
动力学
硫化
腐蚀
高温
kinetics sulfidation, corrosion, H2S, diffusion
