Cl^-,CO_2和微量H_2S共存时13Cr不锈钢的腐蚀性能

Corrosion Resistance of 13Cr Stainless Steel in the Cl^-,CO_2 Environment with Microamount H_2S

通过高温高压釜模拟油气田现场环境,采用扫描电镜、能谱和X射线衍射方法对油气田现场水样腐蚀后1Cr13和OCr13两种钢的表面形貌及成分进行了分析,对比研究了Cl^-,CO_2和微量H_2S共存时在气、液两相中的耐蚀性能。结果表明:1Cr13和0Cr13钢在气、液两相中的平均腐蚀速率均较小,但均有不同程度的点蚀发生,且0Cr13钢点蚀比1Cr13钢点蚀严重;1Cr13和0Cr13钢主要靠钝化膜中铬的化合物降低腐蚀速率。并探讨了影响不锈钢耐蚀性能的因素,包括化学成分、夹杂、晶粒度、显微组织和腐蚀介质,并采用金相分析法进行了验证。

To evaluate the corrosion resistance of 1Cr13 and 0Cr13 in the Cl-, CO2 environment with microamount H2 S, the autoclave was employed to investigate their corrosion behavior in simulating environment of oil and gas field. The corrosion product scale was analyzed by scanning electron microscope （SEM）, energy dispersive X-ray spectrometer （EDS） and X-ray diffraction （XRD）. The results showed that the average corrosion rate of 1Cr13 and 0Cr13 were very low, but there were localized corrosion exist. The pitting of 0Cr13 was more serious than 1Cr13. The corrosion rate was reduced rely on the compound of Cr in the passive film. The stainless steel corrosion resistance factors were discussed, including chemical composition, inclusion, grain size, mierostructure and corrosion medium, and proved by metallographic examination.