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Role of Interfacial Chemistry on Wettability and Carbon Dioxide Corrosion of Mild Steels

Babic, Marijan
http://orcid.org/0000-0001-7491-2924
http://rave.ohiolink.edu/etdc/view?acc_num=ohiou1483543296145156

Abstract Details

2017, Doctor of Philosophy (PhD), Ohio University, Chemical Engineering (Engineering and Technology).
Internal corrosion of oil and gas pipelines made from mild steel is a commonly encountered problem in the oil and gas industry. It is frequently associated with the presence of water that wets the steel surface and carbon dioxide which produces corrosive species in a water phase. This study addresses four aspects related to the role of interfacial chemistry on wetting and corrosion: • Effect of crude oil foaming on corrosion inhibition. • Effect of oil on foams produced by corrosion inhibitors and subsequent corrosion inhibition. • Effect of ionization of naturally present crude oil compounds on wetting and corrosion inhibition. • Effect of residual carbide corrosion products on steel wettability and wetting. The effect of crude oil foaming on corrosion inhibition was investigated with model compounds chosen to represent polar compounds in real crudes with dual foam-forming and corrosion inhibition properties; the investigations were performed in a small scale experimental apparatus. It was found that corrosion inhibition properties of oils were unaffected by the foaming process. The effect of oil on inhibitor-induced foaming was studied in small scale tests with an imidazoline-type corrosion inhibitor and two oils of different chemical composition. The results showed that the hydrocarbon oil can suppress foam generation, effectiveness of corrosion inhibitor can be partially preserved when the layer of oil is in the contact with a foaming aqueous solution. The influence of pH on corrosion inhibition by polar crude oil compounds on their corrosion inhibition and wetting properties was determined using a model oil. Experiments were again performed using an in-house designed and built apparatus for wetting measurements in dynamic conditions. It was shown that pH can significantly alter the corrosion and wetting properties of steel by ionizing crude oil polar compounds. In the last segment of the study the wettability of corroded surfaces was investigated. It was found that carbide layers were more hydrophobic compared to the initial steel surface. However, the water which stays entrapped within the porous carbide layer creates confined aqueous environments that have the potential to significant affect corrosion.
Srdjan Nesic (Advisor)
251 p.
Chemical Engineering; Chemistry; Petroleum Engineering
pipeline; mild steel; crude oil; hydrocarbon; water; carbon dioxide; corrosion; multiphase flow; wetting; wettability; inhibition; contact angle; foam; defoaming; polar compounds; pH; cementite;

Recommended Citations

Citations

  • Babic, M. (2017). Role of Interfacial Chemistry on Wettability and Carbon Dioxide Corrosion of Mild Steels [Doctoral dissertation, Ohio University]. OhioLINK Electronic Theses and Dissertations Center. http://rave.ohiolink.edu/etdc/view?acc_num=ohiou1483543296145156

    APA Style (7th edition)

  • Babic, Marijan. Role of Interfacial Chemistry on Wettability and Carbon Dioxide Corrosion of Mild Steels. 2017. Ohio University, Doctoral dissertation. OhioLINK Electronic Theses and Dissertations Center, http://rave.ohiolink.edu/etdc/view?acc_num=ohiou1483543296145156.

    MLA Style (8th edition)

  • Babic, Marijan. "Role of Interfacial Chemistry on Wettability and Carbon Dioxide Corrosion of Mild Steels." Doctoral dissertation, Ohio University, 2017. http://rave.ohiolink.edu/etdc/view?acc_num=ohiou1483543296145156

    Chicago Manual of Style (17th edition)

ohiou1483543296145156
594
© 2017, all rights reserved.
This open access ETD is published by Ohio University and OhioLINK.