Corrosion behavior of carbon steel in the presence of two novel iron-oxidizing bacteria isolated from sewage treatment plants
Corrosion behavior of carbon steel in the presence of two novel iron-oxidizing bacteria isolated from sewage treatment plants
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DOI：
10.1007/s10532-011-9487-8
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发表时间：
2012-02
期刊：
影响因子：
3.6
通讯作者：
H. Ashassi-Sorkhabi;M. Moradi-Haghighi;G. Zarrini;R. Javaherdashti
中科院分区：
文献类型：
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作者：
H. Ashassi-Sorkhabi;M. Moradi-Haghighi;G. Zarrini;R. Javaherdashti
在这项工作中，两个新的铁氧化细菌（IOB），即gordoniasp。mz - 89 andEnterobactersp。M01101是一种从污水处理厂中分离得到的分离物，通过生化和分子方法对其进行了鉴定。然后，研究了这些细菌存在下碳钢的微生物影响腐蚀（MIC）。采用动电位极化测量、电化学阻抗谱（EIS）等电化学技术测量腐蚀速率，观察腐蚀机理。结果表明，这些微生物的存在降低了腐蚀电位，加快了腐蚀速率。扫描电镜（SEM）图像显示，在这些细菌存在的情况下，碳钢样品在极化后出现了地面边界侵蚀和点蚀。用x射线衍射（XRD）对腐蚀层进行了鉴定。结果表明，这些细菌对腐蚀产物的结晶相有很大的影响，SEM结果也证实了这一点。由此推断，这些细菌是造成碳钢腐蚀的主要原因，特别是以局部腐蚀的形式。
In this work, two novel iron oxidizing bacteria (IOB), namelyGordoniasp. MZ-89 andEnterobactersp.M01101, were isolated from sewage treatment plants and identified by biochemical and molecular methods. Then, microbially influenced corrosion (MIC) of carbon steel in the presence of these bacteria was investigated. The electrochemical techniques such as potentiodynamic polarization measurements and electrochemical impedance spectroscopy (EIS) were used to measure the corrosion rate and observe the corrosion mechanism. The results showed that the existence of these microorganisms decreased the corrosion potential and enhanced the corrosion rate. Scanning electron microscopy (SEM) images revealed the ground boundary attacks and pitting on carbon steel samples in the presence of these bacteria after polarization. Corrosion scales were identified with X-ray diffraction (XRD). It was demonstrated that these bacteria can greatly affect the crystalline phase of corrosion products that also confirmed by SEM results. It was inferred that these bacteria were responsible for the corrosion of carbon steel, especially in the form of localized corrosion.