Matamoros Veloza, A orcid.org/0000-0002-3870-9141, Barker, R orcid.org/0000-0002-5106-6929, Vargas, S et al. (1 more author) (2020) Iron Calcium Carbonate Instability: Structural Modification of Siderite Corrosion Films. ACS Applied Materials and Interfaces, 12 (43). pp. 49237-49244. ISSN 1944-8244
Abstract
Corrosion research related to CO2-containing environments has focused over the past few decades on siderite formation (FeCO3) as a main corrosion product on carbon steel, yet the influence of Ca and other ions on its chemical and structural characteristics is not fully understood. Metal-localized corrosion is the biggest industrial challenge because of the unknown and unpredictable character of this phenomenon that frequently leads to failure. We report here the role of Ca and formation of iron-calcium carbonate (FexCayCO3) through a spiral growth model as in the calcite system and quantify the replacement of Fe2+ by Ca2+ ions in the structure of FeCO3 to form FexCayCO3. The incorporation of Ca2+ inhibits the completion of spiral segments on the growth of the rhombohedral crystals of FeCO3, promoting an enlargement of its structure along the c-axis. This leads to distortions in the chemical structure and morphology affecting the chemical and mechanical properties. Under flow conditions over time in an undersaturated environment, Ca is leached out from the expanded structure of FexCayCO3 increasing the solubility of the crystals, weakening the mechanical properties of the resulting corrosion films and stimulating localized corrosion.
Metadata
Item Type: | Article |
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Authors/Creators: |
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Copyright, Publisher and Additional Information: | © 2020 American Chemical Society. This is an open access article under the terms of the Creative Commons Attribution 4.0 International (CC BY 4.0) (https://creativecommons.org/licenses/by/4.0/) |
Keywords: | corrosion; siderite; FexCayCO3; iron carbonate; iron calcium carbonate |
Dates: |
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Institution: | The University of Leeds |
Academic Units: | The University of Leeds > Faculty of Engineering & Physical Sciences (Leeds) > School of Mechanical Engineering (Leeds) > Institute of Functional Surfaces (Leeds) |
Funding Information: | Funder Grant number EPSRC (Engineering and Physical Sciences Research Council) EP/R00496X/1 |
Depositing User: | Symplectic Publications |
Date Deposited: | 05 Oct 2020 15:49 |
Last Modified: | 02 Dec 2020 15:36 |
Status: | Published |
Publisher: | American Chemical Society |
Identification Number: | 10.1021/acsami.0c14513 |
Open Archives Initiative ID (OAI ID): | oai:eprints.whiterose.ac.uk:166237 |