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Mechanical Characteristics and Adherence of Corrosion Products on Mild Steel

Prieto Nieto, Claudia L.
http://orcid.org/0000-0002-0035-6117
http://rave.ohiolink.edu/etdc/view?acc_num=ohiou1574678745737727

Abstract Details

2019, Master of Science (MS), Ohio University, Chemical Engineering (Engineering and Technology).
The oil and gas industry often rely on the formation of protective corrosion product layers as a primary barrier against internal transmission pipeline corrosion. The methodologies to assess the protectiveness of such corrosion product layers generally consist of simulating the field environmental conditions where the products are formed coupled with evaluation of their protectiveness through corrosion rate measurements and microscopy. However, the mechanical integrity of the formed corrosion product layers is often neglected. Assessment of the mechanical integrity of corrosion product layers can help in the evaluation and prevention of conditions at which mechanical stresses (such as shear stress exerted by a fluid) or external agents (such as by erodent, i.e., entrained sand and other particles) can impact the protectiveness of the layers, or result in black powder formation. Properties such as layer adherence, fracture toughness and hardness can potentially play a significant role in the previously described scenarios. Consequently, the primary motivation of this research was to characterize corrosion product layers with well-known methodologies utilized in tribology science and wear evaluation. As a first step, commonly used methods to determine the adherence of layers on substrates in tribology science were tested on fully-developed corrosion product layers, such as iron carbonate and iron sulfide. Once the results were compared with those available in the open literature, testing of the same type of layers, but developed in dewing conditions, was conducted. Scratch testing was useful to determine the adherence of the tested corrosion product layers. Moreover, the use of scratch testing allowed discrimination of values related to cohesive and adhesive failures, associated with erosion-corrosion and potential problems with localized corrosion, respectively. After successfully performing the mechanical characterization on different corrosion product layers, it was concluded that the mechanical integrity of the layers cannot be easily challenged by external mechanical forces due to the high values of shear stresses required to delaminate the corrosion product layers (in the order of 107 Pa). However, the presence of calcium as a substitutional element in the iron carbonate matrix diminished the mechanical integrity of the layer, making it more susceptible to cohesive failure.
David Young (Advisor)
186 p.
Chemical Engineering; Engineering; Materials Science
Carbon dioxide corrosion; corrosion product layers; adherence properties; critical shear stress; scratch test; nanoindentation

Recommended Citations

Citations

  • Prieto Nieto, C. L. (2019). Mechanical Characteristics and Adherence of Corrosion Products on Mild Steel [Master's thesis, Ohio University]. OhioLINK Electronic Theses and Dissertations Center. http://rave.ohiolink.edu/etdc/view?acc_num=ohiou1574678745737727

    APA Style (7th edition)

  • Prieto Nieto, Claudia. Mechanical Characteristics and Adherence of Corrosion Products on Mild Steel. 2019. Ohio University, Master's thesis. OhioLINK Electronic Theses and Dissertations Center, http://rave.ohiolink.edu/etdc/view?acc_num=ohiou1574678745737727.

    MLA Style (8th edition)

  • Prieto Nieto, Claudia. "Mechanical Characteristics and Adherence of Corrosion Products on Mild Steel." Master's thesis, Ohio University, 2019. http://rave.ohiolink.edu/etdc/view?acc_num=ohiou1574678745737727

    Chicago Manual of Style (17th edition)

ohiou1574678745737727
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This open access ETD is published by Ohio University and OhioLINK.