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首页> 外文期刊>International Journal of Electrochemical Science >Evaluation of the Simultaneous Effects of Sulfate Reducing Bacteria, Soil Type and Moisture Content on Corrosion Behavior of Buried Carbon Steel API 5L X65
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Evaluation of the Simultaneous Effects of Sulfate Reducing Bacteria, Soil Type and Moisture Content on Corrosion Behavior of Buried Carbon Steel API 5L X65

机译：硫酸盐还原细菌，土壤类型和水分含量同时对埋碳钢API 5L X65腐蚀行为的影响评估

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摘要

For the first time, the simultaneous effects of sulfate reducing bacteria (SRB), soil type and moisturecontent on corrosion behavior of a pipeline steel were investigated. Corrosion weight lossmeasurements were performed in abiotic control and SRB-active conditions, at three different moisturecontents, and in two types of soils. Results showed that the presence of SRB in the soils, althoughincreased the corrosion rate and aggravated pitting corrosion at low moisture contents, had a protectiveeffect at high moisture contents. The corrosion rates showed a maximum at the saturation moisturecontent (SMC) of the soils. Soil physicochemical analyses showed that the corrosion rate and soilresistivity were not related while texture and chemical content of the soils had strong effects on thecorrosion rate. At low moisture contents, two layers of corrosion products formed on the surface of thecoupons in both soils. X-ray diffraction (XRD) results showed that the outer layer was ferricoxyhydroxides in both abiotic and SRB-active conditions. The inner layer was magnetite in the abioticcondition and a mixture of magnetite and iron sulfides in the SRB-active condition. At high moisturecontents, one layer of corrosion products formed on the surface in both soils, which was green rusts(GR) in the abiotic condition and a mixture of GRs and iron sulfides in the SRB-active condition.
机译：首次研究了硫酸盐还原细菌（SRB），土壤类型和水分含量对管线钢腐蚀行为的同时影响。在非生物控制和SRB活性条件下，三种不同的水分含量以及两种类型的土壤中进行了腐蚀失重测量。结果表明，土壤中SRB的存在虽然在低水分含量下提高了腐蚀速率并加剧了点蚀，但在高水分含量下具有保护作用。腐蚀速率在土壤的饱和水分含量（SMC）处显示最大值。土壤理化分析表明，土壤的腐蚀速率与土壤电阻率无关，而土壤质地和化学含量对腐蚀速率的影响很大。在低水分含量下，两种土壤中的优惠券表面都会形成两层腐蚀产物。 X射线衍射（XRD）结果表明，在非生物和SRB活性条件下，外层均为三氧化二铁。内层在非生物条件下为磁铁矿，在SRB活性条件下为磁铁矿和硫化铁的混合物。在高水分含量下，两种土壤的表面都形成一层腐蚀产物，这是在非生物条件下的绿锈（GR）和在SRB活性条件下的GRs和硫化铁的混合物。

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