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Full text release has been delayed at the author's request until January 01, 2027

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Effect of Corrosion Residues and Products of Mild Steel on Corrosion Inhibition Mechanisms in CO2 and H2S Environments

Ren, Shuai
http://orcid.org/0000-0001-8714-6894
http://rave.ohiolink.edu/etdc/view?acc_num=ohiou1700149751779475

Abstract Details

2023, Doctor of Philosophy (PhD), Ohio University, Chemical Engineering (Engineering and Technology).
Internal corrosion of transmission tubulars is a huge concern in the oil and gas industry. Corrosion inhibitors (CIs) are often considered the first step in mitigating internal corrosion due to their high efficiency and cost-effectiveness. Yet, predicting the efficiency of corrosion inhibitors, developed and tested in a laboratory environment, in operating field conditions is very challenging. In addition, the presence of corrosion residues or corrosion products on the internal surface of tubular steels can significantly affect the inhibition performance of organic corrosion inhibitors. This aspect is only rarely considered when characterizing the performance of corrosion inhibitors. Therefore, understanding their effects on corrosion inhibition is of great benefit in applying corrosion inhibitors to tackle internal corrosion issues, particularly in aging pipelines. This work mainly focuses on evaluating the corrosion inhibition and revealing the inhibition mechanisms in the absence and presence of various corrosion residues or products, commonly found in oil and gas production. The first half of this work (Chapter 5 and 6) presents a methodology for the characterization of corrosion inhibitors and proposes several innovations to an inhibition prediction model, originally based on the work of Dominguez, et al.. An inhibitor model compound, i.e., tetradecyl phosphate ester (PE-C14), was synthesized in-house and characterized to obtain necessary parameter values required as inputs for the inhibition model. The updated inhibition model could predict steady state and transient corrosion inhibition behaviors with good accuracy. The second half of the presented work (Chapter 7, 8, and 9) focuses on the effects of corrosion residue (Fe3C) and products (FeCO3 and FeS) on corrosion inhibition and advances the understanding of the associated inhibition mechanisms. The galvanic effect caused by residual Fe3C on corrosion rate and inhibition efficiency was quantitatively evaluated using different steel types and inhibitors, and the associated mechanisms were clearly defined. The inhibition mechanisms in the presence of iron carbonate layer, considering different levels of surface coverage, were also investigated. Results showed a synergistic effect between a partial coverage of FeCO3 and inhibitor, but no additive effect was observed with a full coverage of FeCO3. The role of the presence of thin mackinawite film on corrosion inhibition was also studied. While this aspect was not studied in enough depth to draw definitive conclusions, no deterioration of the inhibition efficiency was detected in the presence of mackinawite, in the conditions tested. This work also highlighted that some of the behaviors observed through this study can be highly inhibitor dependent and that proper characterization of corrosion inhibitor performances, over a representative, albeit limited, range of conditions, is still warranted. This work advanced the understanding of the inhibition mechanisms in the presence of these corrosion residue and products and proposed a way forward to address the remaining gaps.
Marc Singer (Advisor)
Srdjan Nesic (Committee Member)
David Young (Committee Member)
Sumit Sharma (Committee Member)
Katherine Cimatu (Committee Member)
Katherine Fornash (Committee Member)
306 p.
Chemical Engineering; Engineering; Materials Science
Oil and Gas; Carbon Steel; Pipeline Internal Corrosion; Carbon Dioxide Corrosion; Hydrogen Sulfide Corrosion; Corrosion Inhibitor; Residual Cementite; Iron Carbide; Galvanic Corrosion; Corrosion Product; Iron Carbonate; Siderite; Iron Sulfide; Mackinawite; Corrosion Mitigation; Inhibition Model; Surface Coverage; Activation Energy.

Recommended Citations

Citations

  • Ren, S. (2023). Effect of Corrosion Residues and Products of Mild Steel on Corrosion Inhibition Mechanisms in CO2 and H2S Environments [Doctoral dissertation, Ohio University]. OhioLINK Electronic Theses and Dissertations Center. http://rave.ohiolink.edu/etdc/view?acc_num=ohiou1700149751779475

    APA Style (7th edition)

  • Ren, Shuai. Effect of Corrosion Residues and Products of Mild Steel on Corrosion Inhibition Mechanisms in CO2 and H2S Environments. 2023. Ohio University, Doctoral dissertation. OhioLINK Electronic Theses and Dissertations Center, http://rave.ohiolink.edu/etdc/view?acc_num=ohiou1700149751779475.

    MLA Style (8th edition)

  • Ren, Shuai. "Effect of Corrosion Residues and Products of Mild Steel on Corrosion Inhibition Mechanisms in CO2 and H2S Environments." Doctoral dissertation, Ohio University, 2023. http://rave.ohiolink.edu/etdc/view?acc_num=ohiou1700149751779475

    Chicago Manual of Style (17th edition)

ohiou1700149751779475
© 2023, all rights reserved.
This open access ETD is published by Ohio University and OhioLINK.