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Corrosion Inhibition Performance of Imidazolium Ionic Liquids and Their Influence On Surface Ferrous Carbonate Layer Formation

Yang, Dongrui
http://rave.ohiolink.edu/etdc/view?acc_num=akron1455113405

Abstract Details

2016, Doctor of Philosophy, University of Akron, Chemical Engineering.
Corrosion inhibitors as effective anti-corrosion applications were widely studied and drawn much attention in both academe and industrial area. In this work, a systematic work, including inhibitors selection, anti-corrosion property and characterization, influence on scale formation, testing system design and so on, were reported. The corrosion inhibition performance of four imidazolium ionic liquids in carbon dioxide saturated NaCl solution was investigated by using electrochemical and surface analysis technologies. The four compounds are 1-ethyl-3-methylimidazolium chloride (a), 1-butyl-3-methylimidazolium chloride (b), 1-hexyl-3-methylimidazolium chloride (c), 1-decyl-3-methylimidazolium chloride (d). Under the testing conditions, compound d showed the highest inhibition efficiency and selected as the main object of further study. As a selected representative formula, 1-decyl-3-methylimidazolium chloride was studied in detail about its corrosion inhibition performance on mild steel in carbon dioxide saturated NaCl brine at pH 3.8 and 6.8. Electrochemical and surface analysis techniques were used to characterize the specimen corrosion process during the immersion in the blank and inhibiting solutions. The precorrosion of specimen surface showed significant and different influences on the anti-corrosion property of DMICL at pH 3.8 and 6.8. The corrosion inhibition efficiency (IE) was calculated based on parameters obtained from electrochemical techniques; the achieved IE was higher than 98% at the 25th hour for the steel with a well-polished surface at pH 3.8. The fitting parameters obtained from electrochemical data helped to account for the interfacial changes. As proved in previous research, 1-decyl-3-methylimidazolium chloride could be used as good corrosion inhibitors under certain conditions. However, under other conditions, such chemicals, as well as other species in oil transporting system, could be a factor influencing the evolution of protective surface inorganic layer. In this part, the FeCO3 layer evolution process for API 5L X52 carbon steel in CO2-saturated NaCl brine in the absence and in the presence of 1-decyl-3-methylimidazolium chloride ionic liquid was characterized using electrochemical techniques. Two models were developed to account for the interfacial evolution: the first model considered the balance of positive and negative charges at the interface of the metal and electrolyte in blank solution, while the second one considered the layer coverage and evolution with the imidazolium compound. The corrosion testing system is scientifically and practically critical for corrosion testing and simulations. In this part, a flowing fluid loop cell (FFLC) system was constructed to simulate the corrosion environment in the pipeline. Main content of this work include the construction of the flowing fluid cell loop (FFLC) system, as well as FFLC-based corrosion/anticorrosion tests under simulated acid conditions. Electrochemical Impedance Spectroscopy (EIS) and Linear Polarization Resistance (LPR) were used as prime techniques to quantify and characterize the corrosion behaviors of carbon steel specimen. The Eff vs. Reynolds number (Re) plots for the specimen located in the chamber and in the loop branch were provided.
Homero Castaneda (Advisor)
Hongbo Cong (Committee Chair)
Qixin Zhou (Committee Member)
Xiaosheng Gao (Committee Member)
Yi Pang (Committee Member)
180 p.
Chemical Engineering; Materials Science
Mild steel; CO2 corrosion; corrosion inhibitor; EIS; polarization; interfaces; Imidazolium; ionic liquid

Recommended Citations

Citations

  • Yang, D. (2016). Corrosion Inhibition Performance of Imidazolium Ionic Liquids and Their Influence On Surface Ferrous Carbonate Layer Formation [Doctoral dissertation, University of Akron]. OhioLINK Electronic Theses and Dissertations Center. http://rave.ohiolink.edu/etdc/view?acc_num=akron1455113405

    APA Style (7th edition)

  • Yang, Dongrui. Corrosion Inhibition Performance of Imidazolium Ionic Liquids and Their Influence On Surface Ferrous Carbonate Layer Formation. 2016. University of Akron, Doctoral dissertation. OhioLINK Electronic Theses and Dissertations Center, http://rave.ohiolink.edu/etdc/view?acc_num=akron1455113405.

    MLA Style (8th edition)

  • Yang, Dongrui. "Corrosion Inhibition Performance of Imidazolium Ionic Liquids and Their Influence On Surface Ferrous Carbonate Layer Formation." Doctoral dissertation, University of Akron, 2016. http://rave.ohiolink.edu/etdc/view?acc_num=akron1455113405

    Chicago Manual of Style (17th edition)

akron1455113405
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© 2016, all rights reserved.
This open access ETD is published by University of Akron and OhioLINK.