摘要
研究了 310SS(stainlesssteel)在 5 5 0 6 5 0℃、常压下、0 .5 %SO2 S2 2 .0 %N2 及 6 0 0℃、常压下、2 .3%SO2 S2 8.8%N2 条件下高温氧化 硫化行为 .SEM /EDX、XRD等技术对腐蚀产物形貌及腐蚀层结构观察、分析表明 ,310SS的腐蚀速率随温度升高而升高 ;当温度相同时 ,气氛中V(S2 ) /V(SO2 )升高时 ,腐蚀速率也升高 ,但变化不大 .主要腐蚀产物可分为 3层 :外层是由Fe1-xS(固溶部分Ni)和少量Fe2 O3 组成 ,疏松多孔、脆、易剥落、呈黑色 ;中间层由FeCr2 S4 和少量Cr2 O3 组成 ;内层很薄 ,不连续 ,由Cr3 S4 和少量Cr2 S3 组成 .腐蚀动力学曲线呈抛物线 .由氧化物 硫化物混合产物组成的中间层较致密 。
The oxidation sulfidation behavior of 310SS has been studied in the gases of 0.5%SO 2 S 2 2.0%N 2 and 2.3%SO 2 S 2 8.8%N 2 respecting under 1.03×10 5 Pa with temperatures ranging from 550℃ to 650℃.The morphology of corrosion products and scale structure are observed and examined with SEM/EDX, XRD. Corrosion rates of 310SS are significantly enhanced with increasing temperature and V (S 2)/ V (SO 2). While V (S 2)/ V (SO 2) of gases has a slight effect on the corrosion rate. The products of corrosion consist of three layers: the porous, crisp and dark outer layer of Fe 1-x S (doped with Ni) and Fe 2O 3(small), the compact middle layer of FeCr 2S 4 and Cr 2O 3(small), the inner layer of Cr 3S 4 containing some Cr 2S 3. The middle layer is the main factor affecting the diffusion of elements. The kinetic curves of corrosion obey the parabolic rate law.
出处
《大连理工大学学报》
EI
CAS
CSCD
北大核心
2000年第5期566-569,共4页
Journal of Dalian University of Technology
关键词
不锈钢
腐蚀
高温氧化
硫化
stainless steels
corrosion
oxidation/sulfidation
