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采用环境扫描电镜(ESEM)、能谱分析仪(EDS)、X射线衍射仪(XRD)、自腐蚀电位与电化学阻抗谱方法,研究了胜利油田集输管线系统污水中碳钢生物膜生长特性及管线材料的腐蚀行为。结果表明,在碳钢表面首先形成铁氧化物;随着生物膜的形成逐步转变成致密硫化亚铁,即腐蚀产物的内层;随后,生物膜在第8 d趋于成熟,大量含碳胞外聚合物组成疏松外层膜,至第11 d部分生物膜脱落造成基体表面有裸露点蚀坑出现。电化学数据表明,随着生物膜层逐渐致密,碳钢电极容抗弧变大,第11 d由于生物膜脱落,电荷传质电阻迅速减小,腐蚀加速,后期高频容抗弧消失,生物矿化产物增加了生物膜的扩散阻力,出现扩散控制,且部分生物膜脱落,局部腐蚀加剧。
The growth characteristics of carbon steel biofilms in wastewater collected from the pipeline system of Shengli Oilfield were studied by using environmental scanning electron microscopy (ESEM), energy dispersive spectrometer (EDS), X-ray diffraction (XRD), self-corrosion potential and electrochemical impedance spectroscopy And corrosion of pipeline materials. The results showed that the first formation of iron oxide on the surface of carbon steel; with the formation of biofilm gradually transformed into dense ferrous sulfide, that is, the inner corrosion products; then biofilm tended to mature in the 8th day, a large number of carbon-containing cells Outer polymer composition of the loose outer membrane, to the first 11 d part of the biofilm shedding caused by the substrate surface exposed pits appear. Electrochemical data showed that as the biofilm layer became denser and the arc resistance of carbon steel electrode became bigger, the charge-transfer resistance decreased rapidly, the corrosion accelerated rapidly, the high-frequency capacitive arc disappeared on the 11th day and the biomineralization The product increased the diffusion resistance of the biofilm, appeared diffusion control, and part of the biofilm shedding, local corrosion intensified.