摘要
为了更好地理解抗硫油管钢在含硫气田中的腐蚀行为和机理,利用高温高压反应釜装置,结合SEM和XRD分析方法,对N80S和P110S抗硫油钢管在模拟下古气藏环境中CO_2,H_2S共存时的腐蚀行为进行了研究,计算了不同CO_2和H_2S分压比时的腐蚀速率,分析了腐蚀产物特征和成分,探讨了其腐蚀机理。结果表明:2种抗硫油管钢随H_2S含量的增大,腐蚀速率先增大后减小;H_2S微量时抗硫油管钢表面形成了Fe CO3和Fe S等腐蚀物,未见明显的腐蚀坑,随H_2S含量的增大,表面的腐蚀产物为铁的硫化物且存在明显的局部腐蚀。
The corrosion behavior of N80S and P110S antisulphur steel under simulant CO2/H2 S co- existing condition of lower paleozoic gas reservoir was investigated by high temperature and high pressure autoclave combined with SEM and XRD methods. The corrosion rates were cal- culated under different PCO2/PH2S, as well as the composition and characteristic of corrosion products were analyzed, and the CO2/H2S corro- sion mechanism was discussed. Results indicated that with increasing H2 S contents, the corrosion rates of the two kinds of antisulphur steels firstly increased and then decreased. When the H2S was trace, the corrosion products were composed of FeCO3 and FeS, and no obvious corro- sion pits were observed. When the content of H2 S increased, the corrosion products were iron sulfides, and obvious localized corrosion occurred.
出处
《材料保护》
CSCD
北大核心
2017年第11期9-13,共5页
Materials Protection
