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首页> 外文期刊>Corrosion Engineering, Science and Technology >Comparison of corrosion scales formed on KO80SS and N80 steels in CO_2/H_2S environment
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Comparison of corrosion scales formed on KO80SS and N80 steels in CO_2/H_2S environment

机译：在CO_2 / H_2S环境下KO80SS和N80钢上形成的腐蚀垢的比较

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摘要

Scanning electron microscopy (SEM), energy dispersive spectroscopy (EDS) and X-ray diffraction (XRD) were applied to analyse the microstructure and composition of the corrosion scale formed on KO80SS and N80 tubes with carbon dioxide (CO_2) and hydrogen sulphide (SO_2). The corrosion scales of both KO80SS and N80 tubes were of the double layer structure, and not only uniform corrosion but also localised corrosion was observed. The crystal of the surface layer is laminar. The main phase in the outer layer is calcium carbonate (CaCO_3), and the inner scale consisted of iron carbonate (FeCO_3) for KO80SS steel and FeS_(0.9) with a little amount of FeCO_3 for N80 steel respectively. Additionally, the electrochemical techniques were used to investigate the characteristics of the corrosion scales. The results indicated that the polarisation resistance R_p of KO80SS steel film was nobler than that of N80 steel film. Finally, the corrosion current I_(corr) of KO80SS steels was lower than that of N80 steels. Corrosion scale of KO80SS tube steels is more protective to the matrix than that of N80 tube steels.
机译：应用扫描电子显微镜（SEM），能量色散谱（EDS）和X射线衍射（XRD）分析了在二氧化碳（CO_2）和硫化氢（SO_2）下KO80SS和N80管上形成的腐蚀垢的微观结构和组成。 ）。 KO80SS和N80管的腐蚀尺度均为双层结构，不仅观察到均匀腐蚀，而且观察到局部腐蚀。表面层的晶体是层状的。外层的主要相是碳酸钙（CaCO_3），内层由KO80SS钢的碳酸铁（FeCO_3）和FeS_（0.9）组成，而N80钢则由少量FeCO_3组成。此外，电化学技术被用来研究腐蚀垢的特性。结果表明，KO80SS钢膜的极化电阻R_p比N80钢膜的极化电阻高。最后，KO80SS钢的腐蚀电流I_（corr）低于N80钢。 KO80SS钢管的腐蚀垢比N80钢管的腐蚀垢对基体的防护性更高。

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