摘要
本文研究了少量Si(1.5％、2.5％)对Fe-25Cr合金在H_2S-H_2混合气氛中高温硫化行为的影响。在800℃以上加Si一定程度地提高了Fe-25Cr合金的抗硫化性能。由于硫化过程中硫化层发生开裂,使得含Si合金有些硫化增重曲线的规律性较差。含Si合金生成了比较完整、均匀的(Cr、Fe)_2S_3内硫化层,但保护作用不大。在对硫化动力学曲线、硫化层结构和组成分析的基础上探讨了Fe-25Cr-xSi合金的硫化机理及Si元素的作用。
The effectiveness of small amount silicon (1,5%, 2.5%) on the high temperature sulfidation properties of Fe-25Cr alloy in H2S-H2 mixtures has been investigated. The addition of silicon enhanced the sulfidation resistance of Fe-25Cr alloy by varying degree above 800℃. The sulfidation kinetics of alloys with Si followed the parabolic law unperfectly because of the cracking of sulfide scale during sulfidizing process. A dense and integrated inner-layer but of poor protection formed on the alloys bearing Si. On the basis of analysis of sulfidation kinetics curves, structure and construction of sulfide scale, uhe sulfidation mechanism of Fe-25Cr-(1.5%, 2.5%) Si alloys has been proposed and the effectiveness of Si discussed.
出处
《北京科技大学学报》
EI
CAS
CSCD
北大核心
1992年第2期232-238,共7页
Journal of University of Science and Technology Beijing
基金
国家自然科学基金
腐蚀科学开放实验室资助
关键词
铁铬合金
硫化
硅
Fe-Cr alloy, sulfidation, silicon, mechanism
