Department of Civil and Environmental Engineering, Florida International University, Miami, FL, US.
Department of Civil and Environmental Engineering, Florida International University, Miami, FL, US.
Bioelectrochemistry. 2021 Dec;142:107922. doi: 10.1016/j.bioelechem.2021.107922. Epub 2021 Aug 4.
Localized corrosion of submerged steel H-piles was detected in a Florida bridge spanning over a brackish river. Analysis of the water showed proliferation of sulfate reducing bacteria (SRB). The steel piles had coincident heavy marine growth that may support biofilms and biocorrosion. The objective of the research described here was to identify the role of the physical morphologies of macrofouling on SRB activity and the aggravation of microbiologically influences corrosion (MIC) of submerged steel bridge. Laboratory experiments were carried out in nutrient-rich environments inoculated with SRB, with both porous and laminate crevice conditions characteristic of soft and hard marine fouling. It was confirmed that SRB proliferation can occur within the crevice environments, but aeration levels under crevices with interaction with the bulk solution can affect SRB activity. Electrochemical impedance spectroscopy provided separation of environmental parameters and surface reaction parameters for the complicated systems relating to corrosion under the porous and laminate crevice geometries.
佛罗里达州一座跨越咸水河的桥梁的水下 H 型钢桩发生局部腐蚀。对水质的分析表明硫酸盐还原菌（SRB）大量繁殖。这些钢桩上同时附着着大量海洋生物，这可能为生物膜和生物腐蚀性提供了支持。这里描述的研究目的是确定宏观生物附着的物理形态在 SRB 活性和微生物影响腐蚀（MIC）加剧方面对水下钢桥的作用。在富含营养的环境中进行了实验室实验，接种了 SRB，并模拟了软、硬海洋生物附着的多孔和层压缝隙条件。结果证实，SRB 可以在缝隙环境中繁殖，但与主体溶液相互作用的缝隙中的充气水平会影响 SRB 的活性。电化学阻抗谱为与多孔和层压缝隙几何形状下腐蚀相关的复杂系统提供了环境参数和表面反应参数的分离。
