N80S抗硫油管钢在含CO_2、微量H_2S及高浓度Cl^-腐蚀介质中的腐蚀行为

Corrosion Behavior of N80s Anti-sulfide Tubing Steel in Carbon Dioxide, A Little Hydrogen Sulfide and High Chlorine Ion Environment

用失重法、扫描电镜(SEM)、能谱分析(EDS)及X射线能谱(XRD)对N80S抗硫油管钢在CO2、微量H2S及高浓度Cl-条件下的腐蚀破坏进行腐蚀实验研究,结果发现,在实验条件下,微量H2S的存在对反应系统影响较大;在膜的形成过程中硫化物腐蚀产物膜(FeS、FeS0.9)会优先形成,并进一步阻碍具有良好保护性的FeCO3腐蚀产物膜的形成;腐蚀产物膜疏松、平均腐蚀速率较大,且有轻度局部腐蚀发生。溶液中高浓度的Cl-及材料中高含量的Cr元素会使N80S抗硫钢局部腐蚀倾向加大。

Corrosion behavior of N80S anti-sulfide tubing is studied in the environment of containing carbon dioxide, a little hydrogen sulfide and high chlorine ion concentration. The results show that H2S plays the major role in the reaction. FeS comes into being firstly during the progress of the experiment, then it holds back the forming of FeCO3 which has strong sheltering effect to metal surface. The corrosion product films are loose, average corrosion rate is high, and there is slight local corrosion that has happened on the surface of N80S anti-sulfide tubing steel. High Cl- and Cr can accelerate the tendency of local corrosion.