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采用失重法、SEM、EDS微观分析方法和电化学阻抗技术研究了X70钢在有/无SRB的侵蚀性土壤模拟溶液中的腐蚀行为。结果表明,在无菌介质中,X70钢表面生成不具有保护性的腐蚀产物,其腐蚀速率随浸泡时间的延长而增大;在有菌介质中,钢表面形成致密的生物膜,对界面传质有一定的阻碍作用,从而减轻X70钢的腐蚀。腐蚀产物的吸附及S含量随浸泡时间的延长而增加,使得腐蚀产物膜疏松易脱落,促进了基体的腐蚀。无菌介质中腐蚀产物内层的稳定性与腐蚀产物的沉积及分布有关;而在有菌介质中,多孔的胞外聚合物对活化过程中的质量传输过程有一定阻碍作用。
The corrosion behavior of X70 steel in simulated soil solution with / without SRB was studied by weight loss method, SEM, EDS microscopic analysis and electrochemical impedance spectroscopy. The results show that in the sterile medium, X70 steel surface without protective corrosion products, the corrosion rate increases with soaking time; in a bacteria medium, the steel surface to form a dense biofilm, the interface Quality has a certain impediment, thereby reducing the X70 steel corrosion. The adsorption and S content of the corrosion products increase with the soaking time, which makes the corrosion product film loose and easy to fall off and promote the corrosion of the matrix. The stability of the inner layer of corrosion products in aseptic media is related to the deposition and distribution of corrosion products. In porous media, porous extracellular polymers have a certain impediment to the mass transfer process during activation.