Mitigating Erosion-Corrosion in CO2 Environments Using Corrosion Resistance Alloys

Abstract An experimental study was conducted to investigate the erosion-corrosion behavior of Corrosion-Resistant Alloys (CRAs) in a CO2-saturated brine flow containing sand particles. Tests for pure erosion, pure corrosion, and combined erosion-corrosion were performed at a temperature of 140 °F. The brine solution had a pH ranging from 4.0 to 4.3 for pure corrosion and erosion-corrosion tests, and a pH of 7.0 for pure erosion. Silica sand with particle sizes of 150 μm and 220 μm, at concentrations ranging from 0.4 wt% to 0.75 wt%, was used in the erosion and erosion-corrosion experiments. Two techniques, including weight loss (WL) and electrochemical linear polarization resistance (LPR), were used to evaluate the performance of Alloy Steel 2507 and Inconel Alloy 718. The WL method was used to measure metal penetration rates resulting from pure corrosion, pure erosion, and total erosion-corrosion, while the LPR technique was used to measure pure corrosion and to capture the corrosion component within the total erosion-corrosion. According to WL data from pure erosion and erosion-corrosion tests, no synergistic effect between erosion and corrosion was observed in either CRA material. The results also indicate that Alloy Steel 2507 exhibited slightly better performance than Inconel Alloy 718 in CO2-saturated environments under the tested conditions.

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