Environmental Molecular Microbiology Research Laboratory, Department of Biotechnology, Thiruvalluvar University, Serkadu, Vellore, Tamil Nadu, 632115, India.
Department of Chemistry, School of Physical and Chemical Sciences, B S Abdur Rahman Crescent Institute of Science and Technology, Vandalur, Chennai, 600 048, India.
Sci Rep. 2024 Oct 25;14(1):25408. doi: 10.1038/s41598-024-76254-8.
This study investigates the efficacy of newly synthesized inhibitor with a dual function of corrosion inhibition and biocide for control of microbial influenced corrosion (MIC) in carbon steel API 5LX in the cooling tower water (CTW) environment. Four types of N-substituted tetrabromophthalic inhibitor (N-TBI) were synthesized, and the structural characterization was performed via proton nuclear magnetic resonance spectroscopy, thermogravimetric analysis and high-resolution mass spectrometry. These studies revealed the distinctive optical, thermal, and dielectric properties of the synthesized inhibitors. The corrosion inhibition efficiency has been evaluated by the weight loss (WL) analysis and electrochemical measurements (ECM) and biofilm assay. Biofilm assays and WL showed that inhibitor II exhibited the highest inhibition efficiency 74% and 79% respectively than others. Further ECM showed that the higher charge transfer resistance and the lower corrosion current, suggesting a protective film formed on the metal surface which was due to the adsorption of the N-TBI. Fourier transform infrared spectroscopy confirmed the adsorption of the N-TBI as C-O stretching and C-H bending with the Fe complex. X-ray diffractometer revealed that the presence of inhibitors in the corrosion product (FeO, FeO, FeHO, FeS) were highly reduced than the control system. Overall, this study highlighted the potential application of N-TBI with dual function of corrosion inhibition and biocide to control the MIC for carbon steel API 5LX used in the CTW environment.
本研究探讨了新合成的抑制剂在抑制碳钢 API 5LX 的微生物影响腐蚀（MIC）方面的双重功效，该抑制剂具有腐蚀抑制和杀菌的双重功能。在冷却塔水中（CTW）环境中。合成了四种 N-取代四溴邻苯二甲酸抑制剂（N-TBI），并通过质子核磁共振波谱、热重分析和高分辨率质谱对其结构进行了表征。这些研究揭示了合成抑制剂独特的光学、热学和介电性能。通过失重（WL）分析和电化学测量（ECM）和生物膜分析评估了腐蚀抑制效率。生物膜分析和 WL 表明，抑制剂 II 的抑制效率最高，分别为 74%和 79%，优于其他抑制剂。进一步的 ECM 表明，较高的电荷转移电阻和较低的腐蚀电流表明在金属表面形成了保护膜，这是由于 N-TBI 的吸附。傅里叶变换红外光谱证实了 N-TBI 的吸附，表现为 C-O 伸缩和 C-H 弯曲与 Fe 络合物。X 射线衍射仪显示，抑制剂在腐蚀产物（FeO、FeO、FeHO、FeS）中的存在比对照体系中的存在高度还原。总的来说，这项研究强调了具有腐蚀抑制和杀菌双重功能的 N-TBI 在控制 CTW 环境中碳钢 API 5LX 的 MIC 方面的潜在应用。
