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Corrosion Mechanisms of Mild Steel in Weak Acids

Tran, Thu N. B.
http://rave.ohiolink.edu/etdc/view?acc_num=ohiou1400078277

Abstract Details

2014, Doctor of Philosophy (PhD), Ohio University, Chemical Engineering (Engineering and Technology).
The corrosion of mild steel in the presence of weak acids is a challenge for the oil and gas industry. Weak acids, such as carbonic acid (in CO2 corrosion) and acetic acid, are reported to accelerate the cathodic reaction, but there is still little agreement as to their role in corrosion mechanisms. Although assumed in many studies, there is no proof that direct reduction of these weak acids occurs and needs to be taken into account. Therefore, the intent of this research is to determine whether these weak acids mainly provide hydrogen ions via their dissociation, with resultant hydrogen ions being directly reduced at the steel surface, or if the direct reduction of weak acids is also important. Electrochemical techniques including linear polarization resistance (LPR), electrochemical impedance spectroscopy (EIS), and polarization sweeps were used to investigate the corrosion mechanisms. The experiments began with acetic acid, a low-molecular-weight weak organic acid commonly found in oil and gas production. The results suggested that the direct reduction of acetic acid is negligible at the steel surface. Similar results were obtained for carbonic acid, i.e., the direct reduction of carbonic acid was insignificant compared to the reduction of hydrogen ions. The corrosion mechanisms for other weak acids such as formic acid, water and hydrogen sulfide were also explored. Finally, an electrochemical model was proposed using FREECORP as a platform, developed by the Institute for Corrosion and Multiphase Technology.
Srdjan Nesic (Advisor)
155 p.
Chemical Engineering
CO2 corrosion; acetic acid; carbonic acid; mild steel corrosion; weak acids; corrosion mechanism; buffering effect

Recommended Citations

Citations

  • Tran, T. N. B. (2014). Corrosion Mechanisms of Mild Steel in Weak Acids [Doctoral dissertation, Ohio University]. OhioLINK Electronic Theses and Dissertations Center. http://rave.ohiolink.edu/etdc/view?acc_num=ohiou1400078277

    APA Style (7th edition)

  • Tran, Thu. Corrosion Mechanisms of Mild Steel in Weak Acids. 2014. Ohio University, Doctoral dissertation. OhioLINK Electronic Theses and Dissertations Center, http://rave.ohiolink.edu/etdc/view?acc_num=ohiou1400078277.

    MLA Style (8th edition)

  • Tran, Thu. "Corrosion Mechanisms of Mild Steel in Weak Acids." Doctoral dissertation, Ohio University, 2014. http://rave.ohiolink.edu/etdc/view?acc_num=ohiou1400078277

    Chicago Manual of Style (17th edition)

ohiou1400078277
819
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This open access ETD is published by Ohio University and OhioLINK.