800 ℃的H2-H2S混合气氛中的硫化
(北京科技大学北京腐蚀与防护中心,冶金部腐蚀－磨蚀与表面技术开放实验室， 北京 100083)
摘 要: 研究了含4%Ti、 9%Mn和8%Nb的Fe-25Cr合金在800 ℃、10-3～1Pa硫分压范围内H2-H2S混合气氛中的高温硫化, 硫化动力学均基本遵循抛物线规律。当硫化层开裂或者与基体分离时，硫化增重—时间曲线出现转折。对比Fe-25Cr 合金，3种元素的加入均不同程度地降低了硫化速度 ，但未根本改变硫化层结构。讨论了Fe-25Cr基三元合金的硫化过程及3种合金元素的作用。
关键字: Ti Mn Nb Fe-25Cr 硫化
（Beijing Corrosion and Protection Center,The Open Laboratory of Corrosion-Erosion and Surface Technology of the Ministry of Metallurgical Industry of China,;
University of Science and Technology Beijing, Beijing 100083, P. R. China）
Abstract:The investigation on the high-temperature sulfidation properties of Fe-25Cr alloys containing 4%Ti, 9%Mn or 8%Nb in H2 -H2S mixed environments of 10-3～1Pa sulfur partial pressures at 800 ℃ was carried out. The sulfidation kinetics follows the parabolic law essentially. Turning aside from the parabolic law takes place when the sulfide scales crackes or seperates from the substrate at high temperature. Compared with the Fe-25Cr alloy, the addition of these three elements reduce the sulfidation rate to varying degrees, but can not improve the sulfide scale structure. The sulfidation processes of Fe-25Cr alloys and the effect of alloying elements have been discussed.
Key words: Ti Mn Nb Fe-25Cr sulfidation
