The effect of calcium ions (Ca2+) on the corrosion of API 5L X80 carbon steel in carbon dioxide (CO2)-saturated brines was studied. Tests were performed in brines containing 0 ppm, 1,000 ppm, or 5,000 ppm of calcium ions with a constant chloride ion concentration at temperatures of 35°C and 60°C, and pressure of 80 bar. The corrosion rates were determined by mass loss, and the protective properties of the film were evaluated by performing electrochemical measurements in a separate vessel containing a standard brine. The results showed that adding Ca2+ to the brine slightly reduced the average corrosion rate, even without a crystalline corrosion product scale. For longer exposure times, it promoted the growth of a mixed iron-calcium carbonate (FexCayCO3) scale with increasing calcium molar mass, shifting the scale morphology from prismatic crystals (pure FeCO3) to globular (mixed carbonate). At 35°C the mixed iron-calcium carbonate scale offered better protection when compared to the pure FeCO3 scale counterpart. However, at 60°C, where a thicker carbonate scale was formed, the increased Ca2+ content had a minimal effect on the corrosion rate.
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1 July 2023
Research Article|
May 02 2023
Formation and Protectiveness of Fe/Ca Carbonate Layer on X80 Steel in High-Pressure CO2 Corrosion Environments
Jonas S. de Sá;
Jonas S. de Sá
‡
*Metallurgical and Materials Engineering Program, Federal University of Rio de Janeiro, Rio de Janeiro 21941-598, Brazil.
‡Corresponding author. E-mail: [email protected].
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Robert Jacklin;
Robert Jacklin
**School of Mechanical Engineering, University of Leeds, Leeds LS2 9JT, United Kingdom.
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José A. C. P. Gomes;
José A. C. P. Gomes
*Metallurgical and Materials Engineering Program, Federal University of Rio de Janeiro, Rio de Janeiro 21941-598, Brazil.
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Richard Barker
Richard Barker
**School of Mechanical Engineering, University of Leeds, Leeds LS2 9JT, United Kingdom.
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CORROSION (2023) 79 (7): 782–789.
Citation
Jonas S. de Sá, Robert Jacklin, José A. C. P. Gomes, Richard Barker; Formation and Protectiveness of Fe/Ca Carbonate Layer on X80 Steel in High-Pressure CO2 Corrosion Environments. CORROSION 1 July 2023; 79 (7): 782–789. doi: https://doi.org/10.5006/4248
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