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首页> 外文期刊>International Journal of Electrochemical Science >Effects of Iron Bacteria on Cast Iron Pipe Corrosion and Water Quality in Water Distribution Systems
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Effects of Iron Bacteria on Cast Iron Pipe Corrosion and Water Quality in Water Distribution Systems

机译：铁细菌对配水系统中铸铁管腐蚀和水质的影响

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The corrosion behavior of cast iron influenced by bacteria was studied in the presence of iron bacteria,with sterile water acting as a reference. The corrosion process and corrosion scales were characterizedby electrochemical and surface analysis methods. The results indicated that iron bacteria favored theformation of corrosion products due to the microbial activity, hence inhibiting the corrosion processperiodically. With the breaking off of corrosion products and biofilms, corrosion, cast iron surfacesbecome more susceptible to corrosion and show higher corrosion rate. In the sterile water, nosignificant changes in Ecorr were observed and the curve varied slightly whereas in the presence of ironbacteria, drastic changes of Ecorr occurred between -0.745V and -0.658V. The values of Rct under theabiotic condition were lower than those in the presence of iron bacteria due to the formation of amicrocell with a small anode and a big cathode, indicating that iron bacteria play an important role inthe corrosion process. Corrosion products formed with iron bacteria had a layered structure andheterogeneous distribution of floccules with different substances. Due to the metabolic activity, thegrowth and propagation of iron bacteria were closely related to the ferrous ion and dissolved oxygenconcentration changes. Iron bacteria might lead to an increase of pH values and higher concentrationof ferrous ion in bulk water.
机译：在有铁细菌存在的情况下，以无菌水为参考，研究了细菌对铸铁的腐蚀行为。用电化学和表面分析方法对腐蚀过程和腐蚀垢进行了表征。结果表明，铁细菌由于其微生物活性而有利于腐蚀产物的形成，从而周期性地抑制了腐蚀过程。随着腐蚀产物和生物膜的破裂，腐蚀，铸铁表面变得更易于腐蚀，并显示出更高的腐蚀速率。在无菌水中，观察不到Ecorr的显着变化，并且曲线略有变化，而在存在铁细菌的情况下，Ecorr的急剧变化发生在-0.745V至-0.658V之间。由于形成具有小的阳极和大的阴极的微电池，在非生物条件下的Rct值低于存在铁细菌的情况下的Rct值，表明铁细菌在腐蚀过程中起着重要的作用。由铁细菌形成的腐蚀产物具有层状结构和不同物质的絮凝物的不均匀分布。由于其代谢活动，铁细菌的生长和繁殖与亚铁离子和溶解氧浓度的变化密切相关。铁细菌可能导致散装水中的pH值升高和亚铁离子浓度升高。

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