In this work, six common stainless steel grades were compared with respect to ennoblement characteristics, corrosion performance and tendency to biofouling in brackish sea water in a pilot-scale cooling water circuit. Two tests were performed, each employing three test materials, until differences between the materials were detected. Open circuit potential (OCP) was measured continuously in situ. Potentiodynamic polarization and electrochemical impedance spectroscopy (EIS) measurements were conducted before and after the tests. Exposed specimens were further subjected to examinations by scanning electron microscopy (SEM) and energy-dispersive spectroscopy (EDS), and the biofouling was studied using epifluorescence microscopy, quantitative polymerase chain reaction (qPCR) and high-throughput sequencing (HTP sequencing).

The results revealed dissimilarities between the stainless steel grades in corrosion behaviour and biofouling tendency. The test material that differed from the most of the other studied alloys was grade EN 1.4162. It experienced fastest and most efficient ennoblement of OCP, its passive area shrank to the greatest extent and the cathodic reaction was accelerated to a significant degree by the development of biofilm. Furthermore, microbiological analyses revealed that bacterial community on EN 1.4162 was dominated by Actinobacteria, whereas on the other five test materials Proteobacteria was the main bacterial phylum.

在这项工作中，在中试规模的冷却水回路中，对六个普通不锈钢等级的咸味海水的咸味特性，腐蚀性能和生物结垢趋势进行了比较。进行了两次测试，每种测试都使用三种测试材料，直到检测到材料之间的差异。在原位连续测量开路电势（OCP）。在测试之前和之后进行电位动力学极化和电化学阻抗谱（EIS）测量。通过扫描电子显微镜（SEM）和能量分散光谱（EDS）对暴露的样品进行进一步检查，并使用落射荧光显微镜，定量聚合酶链反应（qPCR）和高通量测序（HTP测序）研究了生物污染。

结果表明，不锈钢牌号在腐蚀行为和生物结垢趋势方面存在差异。与大多数其他研究合金不同的测试材料为EN 1.4162级。它经历了OCP的最快，最有效的增高，其钝化区域最大程度地缩小了，并且随着生物膜的发展，阴极反应在很大程度上得到了加速。此外，微生物学分析表明，EN 1.4162上的细菌群落主要是放线菌，而在其他五种测试材料上，Proteobacteria是主要的细菌门。