The Synergistic Influence of Chloride Ion Concentration and Environmental Temperature on the Corrosion Mechanisms of X65 Carbon Steel in CO2-Saturated Oilfield Environments
DOI:
https://doi.org/10.62638/ZasMat1528Abstract
The longevity and safety of pipelines in the oil and gas sector rely on understanding how chloride ions influence corrosion in carbon steels exposed to CO₂-rich environments. This research investigates how different concentrations of chloride ions (1%, 3.5%, and 10% NaCl) affect the electrochemical response and corrosion behavior of X65 carbon steel. Tests were conducted under dynamic flow conditions at temperatures of 30°C, 50°C, and 80°C that closely simulate real-world oilfield conditions.
The results show that chloride ions enhance ferrite dissolution, leading to the formation of an inner amorphous iron carbonate (FeCO3) layer and an outer crystalline FeCO3 layer. While higher chloride concentrations increase the corrosive severity of the environment, they do not significantly alter the overall structure of the corrosion products.
Findings provide new insights into CO2 corrosion mechanisms in high-salinity environments and have practical implications for materials selection and pipeline maintenance in the oil and gas industry.
Keywords:
CO₂ corrosion, Corrosion kinetics, Pipeline integrity, Chloride ions, High-salinity environments, Localized corrosion, Produced waterReferences
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