腐蚀
X射线光电子能谱
碳钢
金属
质子化
材料科学
水溶液
碳纤维
化学工程
化学
冶金
有机化学
复合材料
离子
复合数
工程类
作者
Kiran Kousar,Michael Dowhyj,Mateusz Walczak,Thomas Ljungdahl,Alexander Wetzel,Hans Oskarsson,Alex S. Walton,Paolo Restuccia,N. M. Harrison,Robert Lindsay
出处
期刊:Faraday Discussions
[The Royal Society of Chemistry]
日期:2022-01-01
卷期号:236: 374-388
被引量:5
摘要
In many engineering scenarios, surface-active organic species are added to acidic solutions to inhibit the corrosion of metallic components. Given suitable selection, such corrosion inhibitors are highly effective, preventing significant degradation even in highly aggressive environments. Nevertheless, there are still considerable gaps in fundamental knowledge of corrosion inhibitor functionality, severely restricting rational development. Here, we demonstrate the capability of X-ray photoelectron spectroscopy (XPS), supported by ab initio modelling, for revealing key details of inhibited substrates. Attention is focussed on the corrosion inhibition of carbon steel through the addition of an exemplar imidazoline-based corrosion inhibitor (OMID) to aqueous solutions of both HCl and H2SO4. Most notably, it is demonstrated that interfacial chemistry varies with the identity of the acid. High resolution Fe 2p, O 1s, N 1s, and Cl 2p XPS spectra, acquired from well-inhibited carbon steel in 1 M HCl, show that there are two different singly protonated OMID species bound directly to the metallic carbon steel substrate. In sharp contrast, in 0.01 M H2SO4, OMID adsorbs onto an ultra-thin surface film, composed primarily of a ferric sulfate (Fe2(SO4)3)-like phase. Such insight is essential to efforts to develop a mechanistic description of corrosion inhibitor functionality, as well as knowledge-based identification of next generation corrosion inhibitors.
科研通智能强力驱动
Strongly Powered by AbleSci AI