800 ℃的H2-H2S混合氣氛中的硫化
(北京科技大學北京腐蝕與防護中心,冶金部腐蝕－磨蝕與表面技術(shù)開放實驗室， 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硫分壓范圍內(nèi)H2-H2S混合氣氛中的高溫硫化, 硫化動力學均基本遵循拋物線規(guī)律。當硫化層開裂或者與基體分離時，硫化增重—時間曲線出現(xiàn)轉(zhuǎn)折。對比Fe-25Cr 合金，3種元素的加入均不同程度地降低了硫化速度 ，但未根本改變硫化層結(jié)構(gòu)。討論了Fe-25Cr基三元合金的硫化過程及3種合金元素的作用。
關(guān)鍵字: 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
