A Mechanistic Approach to Understanding Microbiologically Influenced Corrosion by Metal-Depositing Bacteria
A Mechanistic Approach to Understanding Microbiologically Influenced Corrosion by Metal-Depositing Bacteria
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DOI：
10.5006/2899
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发表时间：
2019-01-01
期刊：
影响因子：
1.6
通讯作者：
Little, Brenda J.
中科院分区：
文献类型：
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作者：
Lee, Jason S.;Little, Brenda J.
铁（Fe）和锰（Mn）氧化细菌通常被单独或共同引用为微生物影响腐蚀（MIC）的假定微生物。这两组微生物共同具有附着于表面并产生金属氧化物/氢氧化物/羟基氧化物的宏观积累（沉积物）的能力，这些金属氧化物/氢氧化物/羟基氧化物可以影响某些环境中某些金属和合金的腐蚀。在所有情况下，一旦开始，腐蚀是独立的殖民物种的活动。尽管铁氧化细菌（FeOB）的系统发育多样性，以下部分将处理归因于嗜酸性，嗜石，微需氧FeOB的腐蚀机制。生物氧化铁的矿物学在广泛的环境中是一致的。所有的FeOB都产生致密的沉积物，这些沉积物可以直接导致低合金不锈钢（SS）的腐蚀，即，沉积物下腐蚀锰氧化菌（MnOB）与其他微生物的联合作用可以稳定低合金不锈钢的沉积物下腐蚀。FeOB对碳钢腐蚀的影响可能与金属离子的沉积、电偶腐蚀或与其他腐蚀微生物的缔合有关。所有MnOB都产生Mn氧化物，其是强氧化剂，可导致低合金SS的贵族化并增加淡水中碳钢的腐蚀电流。与锰矿床有关的腐蚀取决于矿物存款和基底之间的关系。
Iron (Fe)- and manganese (Mn)-oxidizing bacteria are often cited individually and collectively as putative microorganisms for microbiologically influenced corrosion (MIC). The two groups of microorganisms have in common the ability to attach to surfaces and produce macroscopic accumulations (deposits) of metal oxides/hydroxides/oxyhydroxides that can influence corrosion of some metals and alloys in some environments. In all cases, once initiated, the corrosion is independent of the activities of the colonizing species. Despite the phylogenetic diversity of Fe-oxidizing bacteria (FeOB), the following sections will deal with corrosion mechanisms attributed to neutrophilic, lithotrophic, microaerophilic FeOB. The mineralogy of biologically oxidized Fe is consistent over a wide range of environments. All FeOB produce dense deposits that can cause corrosion of low alloy stainless steels (SS) directly, i.e., under-deposit corrosion. Association of Mn-oxidizing bacteria (MnOB) and other microorganisms may stabilize the under-deposit corrosion on low alloy SS. The influence of FeOB on the corrosion of carbon steel may be related to deposition of metal ions, causing galvanic corrosion or association with other corrosion-causing microorganisms. All MnOB produce Mn oxides that are strong oxidizing agents that can cause ennoblement of low alloy SS and increase corrosion currents on carbon steel in fresh water. Corrosion associated with Mn deposits depends on the relationship between the mineral deposit and the substratum.