Microbially sustained pitting corrosion of 304 stainless steel in anaerobic seawater
Microbially sustained pitting corrosion of 304 stainless steel in anaerobic seawater
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DOI：
10.1016/0010-938x(95)00016-d
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发表时间：
1995-07
影响因子：
8.3
通讯作者：
P. Angell;J. Luo;D. White
中科院分区：
文献类型：
--
作者：
P. Angell;J. Luo;D. White
研制了一种在同心不锈钢电极中感应小阳极、大阴极的系统。施加约11 μA cm−2的电流72 h，使细菌在封闭系统中在厌氧条件下的人工海水中定植电极。一旦施加的电流被移除，产生的电流被监测，营养物质的流动恢复到一个开放的系统。只有SRB和Vibrio sp.的共培养维持了大约3 μA cm−2的电流，持续了bb0 200 h。纯无菌培养或无菌对照没有维持电流。细菌计数显示，产生的电流取决于阳极和阴极上细菌的数量和类型。在阴极上，SRB是必要的，导致高于100 kΩ cm2的高电荷转移电阻，而在阳极上，混合财团是必要的，导致低于1 kΩ cm2的低电荷转移电阻。这些结果似乎为之前提出的阴极去极化理论提供了进一步的证据，该理论是MIC和另一种涉及混合财团的阳极反应的机制。
A system has been developed in which a small anode and large cathode can be induced in a concentric stainless steel electrode. A current of approximately 11 μA cm−2was applied for 72 h while bacteria were allowed to colonize the electrode in a closed system, in artificial seawater under anaerobic conditions. Once the applied current was removed, the resultant galvanic current was monitored and a flow of nutrients resumed to an open system. Only a co-culture of SRB and Vibrio sp. maintained a current of approximately 3 μA cm−2for >200 h. No current was maintained with pure axenic cultures or in sterile controls. Bacterial counts revealed that the resultant current was dependent on the number and type of bacteria on both the anode and cathode. It would appear that SRB are necessary on the cathode, leading to high charge transfer resistance above 100 kΩ cm2, while a mixed consortium is necessary on the anode giving low charge transfer resistance below 1 kΩ cm2. These results would appear to give further evidence for the previously proposed cathodic depolarization theory as a mechanism for MIC and for another anodic reaction involving a mixed consortium.