Investigation of Corrosion Inhibitor Adsorption on Mica and Mild Steel Using Electrochemical Atomic Force Microscopy and Molecular Simulations

被引:3
|
作者
Wang, Huiru [1 ,2 ]
Sharma, Sumit [2 ]
Pailleret, Alain [1 ]
Brown, Bruce [2 ]
Nesi, Srdjan [2 ]
机构
[1] Sorbonne Univ, CNRS, Lab Interfaces & Syst Electrochim LISE, UMR 8235, Pl Jussieu,Case Courrier 133, F-75005 Paris, France
[2] Ohio Univ, Inst Corros & Multiphase Technol, Dept Chem & Biomol Engn, 342 West State St, Athens, OH 45701 USA
基金
美国国家科学基金会;
关键词
carbon steel; cementite; corrosion inhibitors; CO2; corrosion; electrochemical atomic force microscopy; molecular simulations; quaternary ammonium; SELF-ASSEMBLED MONOLAYER; CARBON-STEEL; SURFACE; GROWTH; WATER; IMIDAZOLINE; INTERFACE; MECHANISM; COVERAGE; KINETICS;
D O I
10.5006/4136
中图分类号
T [工业技术];
学科分类号
08 ;
摘要
Electrochemical atomic force microscopy (EC-AFM) experiments, including simultaneous linear polarization resistance (LPR) tests and in situ AFM imaging, under a CO2 atmosphere, were performed to investigate the adsorption characteristics and inhibition effects of a tetradecyldimethylbenzylammonium corrosion inhibitor model compound. When the inhibitor bulk concentration was at 0.5 critical micelle concentration (CMC), in situ AFM results indicated nonuniform tilted monolayer formation on the mica surface and EC-AFM results indicated partial corrosion of the UNS G10180 steel surface. At 2 CMC, a uniform tilted bilayer or perpendicular monolayer was detected on mica, and corrosion with UNS G10180 steel was uniformly retarded. Consistently, simultaneous LPR tests showed that corrosion rates decreased as the inhibitor concentration increased until it reached the surface saturation value (1 and 2 CMC). Molecular simulations have been performed to study the formation of the inhibitor layer and its molecular-level structure. Simulation results showed that at the initiation of the adsorption process, islands of adsorbed inhibitor molecules appear on the surface. These islands grow and coalesce to become a complete self-assembled layer.
引用
收藏
页码:990 / 1002
页数:13
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