期刊
CORROSION
卷 78, 期 10, 页码 990-1002出版社
NATL ASSOC CORROSION ENG
DOI: 10.5006/4136
关键词
carbon steel; cementite; corrosion inhibitors; CO2 corrosion; electrochemical atomic force microscopy; molecular simulations; quaternary ammonium
资金
- Anadarko
- Baker Hughes
- Chevron
- CNOOC
- ConocoPhillips
- ExxonMobil
- BP
- DNV GL
- M-I SWACO (Schlumberger)
- Multi-Chem (Halliburton)
- Occidental Oil Company
- Saudi Aramco
- Shell Global Solutions
- SINOPEC (China Petroleum)
- TotalEnergies
- National Science Foundation CBET Grant [1705817]
- National Science Foundation XSEDE Grant [DMR190005]
- Div Of Chem, Bioeng, Env, & Transp Sys
- Directorate For Engineering [1705817] Funding Source: National Science Foundation
This study investigated the adsorption characteristics and inhibition effects of a corrosion inhibitor in a CO2 atmosphere using electrochemical atomic force microscopy (EC-AFM) experiments. The results showed that at certain concentrations, the inhibitor formed uniform monolayers or bilayers on the surface, which significantly retarded the corrosion of the steel.
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.
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