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8d趋于成熟,大量含碳胞外聚合物组成疏松外层膜,至第11d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11d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.
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