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首页> 外文期刊>Applied Surface Science >Characteristics of CO_2 corrosion scale formed on N80 steel in stratum water with saturated CO_2
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Characteristics of CO_2 corrosion scale formed on N80 steel in stratum water with saturated CO_2

机译：N80钢在饱和CO_2的地层水中CO_2腐蚀垢的特征。

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摘要

The component and structure of CO_2 corrosion scale formed on N80 tubing steel were studied by using X-ray photoelectron spectroscopy (XPS), X-ray diffraction (XRD) and scanning electron microscopy (SEM); the electrochemical property of N80 steel covered by corrosion scale was investigated by electrochemical impedance spectroscopy (EIS). The results shows a double-layer structure of the corrosion scale, in which the principal component of the outer layer is FeCO_3 with a limited amount of partial deriv-FeOOH; while for the inner scale, FeCO_3 is still the major component, but some Fe positions in FeCO_3 lattice are substituted by Ca, and form a composite compound of (Fe,Ca)CO_3 in the inner scale. EIS study shows that the anodic impedance spectrum has three time constants, i.e., the capacitance at high frequency, Warburg impedance at middle frequency and capacitance at low frequency.
机译：利用X射线光电子能谱（XPS），X射线衍射（XRD）和扫描电子显微镜（SEM）研究了N80管材上形成的CO_2腐蚀垢的成分和结构。通过电化学阻抗谱（EIS）研究了N80钢被腐蚀垢覆盖的电化学性能。结果显示了腐蚀垢的双层结构，其中外层的主要成分是FeCO_3，具有有限量的部分衍生FeOOH。对于内层，FeCO_3仍是主要成分，但FeCO_3晶格中的某些Fe位置被Ca取代，并在内层形成（Fe，Ca）CO_3的复合化合物。 EIS研究表明，阳极阻抗谱具有三个时间常数，即高频电容，中频Warburg阻抗和低频电容。

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