Sulfate‐reducing bacteria (SRB) are one of the main reasons for the accelerated corrosion of steel. Cathodic polarization has been reported as an effective and economic method against marine corrosion, including microbiologically induced corrosion. However, the interaction between cathodic polarization and microbial activity has not been well defined. In this study, a fluorine‐doped tin oxide electrode is used to study the effect of cathodic current on SRB cells. Fluorescence microscopy results clearly show that the attachment degree of SRB is dependent on the electric quantity and current intensity. The large electric quantity and high cathodic current (400 mA/m² × 30 h) can effectively inhibit bacterial attachment and subsequent biofilm formation. Furthermore, the effect of cathodic potential on the corrosion behavior of X65 steel in the presence of SRB is systematically investigated. Results show that the impressed charges, the increase of pH, and the formation of calcareous deposits on the electrode surface at the cathodic potential of −1,050 mV/SCE inhibit the attachment of SRB. In turn, the presence of SRB also interferes with the electrochemical reactions that occur during the polarization process, thus increasing the cathodic current. The interaction between SRB‐induced corrosion and the process of preventing corrosion by various cathodic potentials is discussed.

中文翻译：

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阴极极化对X65钢在含硫酸盐还原细菌的海水中腐蚀行为的影响

硫酸盐还原细菌（SRB）是钢加速腐蚀的主要原因之一。据报道，阴极极化是一种有效且经济的方法，可抵御海洋腐蚀，包括微生物引起的腐蚀。但是，阴极极化与微生物活性之间的相互作用尚未得到很好的定义。在这项研究中，掺氟氧化锡电极用于研究SRB电池上阴极电流的影响。荧光显微镜结果清楚地表明，SRB的附着程度取决于电量和电流强度。电量大，阴极电流大（400 mA / m ² ×30 h）可有效抑制细菌附着和随后的生物膜形成。此外，系统地研究了在SRB存在下阴极电势对X65钢腐蚀行为的影响。结果表明，在-1,050 mV / SCE的阴极电位下，外加电荷，pH值的增加以及电极表面钙质沉积物的形成会抑制SRB的附着。反过来，SRB的存在也会干扰极化过程中发生的电化学反应，从而增加阴极电流。讨论了SRB引起的腐蚀与通过各种阴极电位防止腐蚀的过程之间的相互作用。