Dhongde Nikhil Rahul, Adhikari Sayani, Rajaraman Prasanna Venkatesh
Department of Chemical Engineering, Indian Institute of Technology Guwahati, Guwahati, 781039, Assam, India.
Environ Sci Pollut Res Int. 2025 Feb;32(8):4511-4522. doi: 10.1007/s11356-025-35984-6. Epub 2025 Jan 29.
The adoption of carbon capture, utilization, and storage (CCUS) technology is increasingly prevalent, driven by the global initiative to conserve energy and reduce emissions. Nevertheless, CCUS has the potential to induce corrosion in equipment, particularly in high-pressure environments containing carbon dioxide (CO). Therefore, anti-corrosion protection is necessary for the metal utilized for CO production and storage equipment. Herein, an ionic liquid (triethylsulfonium bis-trifluoromethylsulfonyl-imide) was used to functionalize graphene oxide (prepared via the improved Hummers method). Field emission scanning electron microscopy (FESEM), transmission electron microscopy (TEM), and X-ray photoelectron spectroscopy (XPS) confirmed ionic liquids (IL) were successfully attached to the graphene oxide (GO) lattice. Afterwards, 0.5 wt% and 1 wt% IL-GO composites were separately incorporated into the epoxy and coated on the carbon steel substrate with a thickness of 50 ± 2 µm. The surface examinations demonstrated a consistent distribution of the ILGO composite in the epoxy matrix and achieved a uniform surface. The anti-corrosive properties of 0.5 wt% and 1 wt% IL-GO/epoxy coatings were evaluated using electrochemical tests such as potentiodynamic polarization and electrochemical impedance spectroscopy (EIS) after immersion in the CO (1.5 MPa) and 3.5 wt% sodium chloride (NaCl) systems. After 48 h of immersion in a corrosion environment (CO-NaCl), the protection efficiency of 0.5 wt% and 1 wt% IL-GO/epoxy coatings is 86.41 ± 0.55 and 92.59 ± 0.83 (%), respectively. The findings of this study demonstrated that the ILGO composite-reinforced epoxy coating exhibited exceptional corrosion resistance when exposed to CO.
在全球节能和减排倡议的推动下，碳捕获、利用与封存（CCUS）技术的应用越来越普遍。然而，CCUS有可能导致设备腐蚀，特别是在含有二氧化碳（CO）的高压环境中。因此，用于CO生产和储存设备的金属需要进行防腐保护。在此，使用离子液体（三乙硫鎓双三氟甲基磺酰亚胺）对氧化石墨烯（通过改进的Hummers法制备）进行功能化处理。场发射扫描电子显微镜（FESEM）、透射电子显微镜（TEM）和X射线光电子能谱（XPS）证实离子液体（IL）成功附着在氧化石墨烯（GO）晶格上。之后，将0.5 wt%和1 wt%的IL-GO复合材料分别加入到环氧树脂中，并涂覆在厚度为50±2 µm的碳钢基材上。表面检测表明ILGO复合材料在环氧基质中分布均匀，表面均匀。将0.5 wt%和1 wt%的IL-GO/环氧涂层浸泡在CO（1.5 MPa）和3.5 wt%氯化钠（NaCl）体系中后，通过动电位极化和电化学阻抗谱（EIS）等电化学测试评估其防腐性能。在腐蚀环境（CO-NaCl）中浸泡48小时后，0.5 wt%和1 wt%的IL-GO/环氧涂层的保护效率分别为86.41±0.55和92.59±0.83（%）。本研究结果表明，ILGO复合增强环氧涂层在暴露于CO时表现出优异的耐腐蚀性。
