采用失重法、X射线衍射方法(XRD)、扫描电镜观察及其能谱分析等方法研究了TP100钢在含O2,CO2以及CO2与O2共存3种环境中的腐蚀行为.结果表明,在有CO2与O2共存环境中,TP100钢的腐蚀速率显著高于CO2或O2两种气体单独存在条件下.在有CO2与O2共存环境中,TP100钢表面形成主要由FeCO3,Fe3O4和Fe2O3组成的疏松多孔的腐蚀产物,这种多孔的腐蚀产物为腐蚀气体和溶液提供了快速通道从而促进了腐蚀,在基体表面出现了明显的蚀坑.
The corrosion behavior of TP100 steel in CO2 and O2 coexisting condition was studied using weight loss method,scanning electron microscopy (SEM),energy dispersive spectrometer (EDS) and X-ray diffraction (XRD).The results show that the CO2-O2 corrosion rate of TP100 steel is remarkably higher than that of CO2 corrosion or O2 corrosion,respectively.CO2-O2 corrosion scale is loose,composed of FeCO3,Fe2 O3 and Fe3 O4,and lots of pores exist in the corrosion scale.The porous scale provided fast transferring channel for corrosive solution,and as a result,obvious pits appeared on the surface.
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