Shaikhah Dilshad, Taleb Wassim, Mohamed-Said Maalek, Cowe Bruce, Barker Richard
Institute of Functional Surfaces, School of Mechanical Engineering, University of Leeds, Leeds LS2 9JT, United Kingdom.
Scientific Research Center, Soran University, Soran, Kurdistan Region 44008, Iraq.
ACS Omega. 2024 Jul 9;9(29):31745-31753. doi: 10.1021/acsomega.4c02616. eCollection 2024 Jul 23.
Carbon dioxide (CO) internal corrosion of carbon steel pipelines is a significant challenge and is typically managed by adding corrosion inhibitors. In certain operational conditions, a natural protective layer of iron carbonate (FeCO) can form on the internal walls of the pipeline, offering inhibition efficiency comparable to that of standard surfactant inhibitors. However, incomplete coverage of the FeCO layer on carbon steel can sometimes trigger localized corrosion. Our previous research demonstrated that poly(allylamine hydrochloride) (PAH) can work synergistically with FeCO when the corrosion product partially covers X65 carbon steel surfaces in an aqueous CO corrosion environment. In this study, we utilize rotating cylinder electrode (RCE) tests along with electrochemical measurements to investigate the FeCO-PAH hybrid structure in a dynamic environment. We characterize the general and localized corrosion behavior as well as the surface properties of both naturally formed FeCO and FeCO-PAH hybrid layers using interferometry and focused ion beam scanning electron microscopy.
碳钢管道的二氧化碳（CO）内部腐蚀是一项重大挑战，通常通过添加缓蚀剂来解决。在某些运行条件下，管道内壁会形成一层天然的碳酸亚铁（FeCO）保护层，其缓蚀效率与标准表面活性剂缓蚀剂相当。然而，FeCO层在碳钢上的覆盖不完全有时会引发局部腐蚀。我们之前的研究表明，在水相CO腐蚀环境中，当腐蚀产物部分覆盖X65碳钢表面时，聚（烯丙胺盐酸盐）（PAH）可以与FeCO协同作用。在本研究中，我们利用旋转圆柱电极（RCE）测试以及电化学测量方法，在动态环境中研究FeCO-PAH混合结构。我们使用干涉测量法和聚焦离子束扫描电子显微镜来表征自然形成的FeCO和FeCO-PAH混合层的全面腐蚀和局部腐蚀行为以及表面性质。
