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Iron Carbide Development and its Effect on Inhibitor Performance

Al-Asadi, Akram A.
http://rave.ohiolink.edu/etdc/view?acc_num=ohiou1416422709

Abstract Details

2014, Master of Science (MS), Ohio University, Chemical Engineering (Engineering and Technology).
Several types of mild steel are used in pipeline transmission. Steels with similar mechanical properties, e.g., yield strengths, have different contents and structures of iron carbide. This leads to different corrosion behaviors and corrosion inhibitor performance. The purpose of the present study is to develop an understanding of how iron carbide layers, derived from the different microstructures of carbon steels during corrosion, affect corrosion behavior and inhibitor performance. Glass cell experiments were conducted with 2 liters of 1 wt. % NaCl as the electrolyte at the desired temperature. A magnetic stirrer, set to 200 rpm, was used to ensure a fully mixed solution as carbon dioxide gas was constantly sparged into the test electrolyte. The solution pH was adjusted to the desired pH by addition of deoxygenated 1.0 M sodium hydroxide (NaOH) or sodium bicarbonate (NaHCO3) solutions. Hydrochloric acid (HCl) was used to maintain the pH around 5.0 ± 0.1. Three steel samples were immersed in the glass cell once the pH stabilized and tests were run for 3 days. Steels with different microstructures and chemical compositions were used in separate sets of experiments. After 24 hours of each experiment, a sample was withdrawn for surface analysis. In addition, experiments show that iron carbide layer development is dependent upon the microstructure and chemical composition, particularly carbon content, of the carbon steel from which it is derived. In each case, iron carbide impairs the performance of tested imidazoline-type inhibitors. The Fe3C developed from X65 (0.14 wt. % C) steel (ferrite-discrete cementite) has significantly more effect (i.e. decreases the inhibition efficiency) on the performance of inhibitors than the Fe3C developed from other types of steel. The performance of the inhibitor on X65 (0.05 wt. % C) spheroidized was less impaired than the performance of the inhibitor on other types of steel. In addition, the performance of the inhibitor after 1 day pre-corrosion is also dependent on the microstructure and chemical composition of the steel.
David Young (Advisor)
185 p.
Chemical Engineering
CO2 corrosion; iron carbide; iron carbonate; steel microstructure; normalized; spheroidized; quenched; tempered

Recommended Citations

Citations

  • Al-Asadi, A. A. (2014). Iron Carbide Development and its Effect on Inhibitor Performance [Master's thesis, Ohio University]. OhioLINK Electronic Theses and Dissertations Center. http://rave.ohiolink.edu/etdc/view?acc_num=ohiou1416422709

    APA Style (7th edition)

  • Al-Asadi, Akram. Iron Carbide Development and its Effect on Inhibitor Performance. 2014. Ohio University, Master's thesis. OhioLINK Electronic Theses and Dissertations Center, http://rave.ohiolink.edu/etdc/view?acc_num=ohiou1416422709.

    MLA Style (8th edition)

  • Al-Asadi, Akram. "Iron Carbide Development and its Effect on Inhibitor Performance." Master's thesis, Ohio University, 2014. http://rave.ohiolink.edu/etdc/view?acc_num=ohiou1416422709

    Chicago Manual of Style (17th edition)

ohiou1416422709
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© 2014, all rights reserved.
This open access ETD is published by Ohio University and OhioLINK.