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Experimental Evaluation Of Corrosion Modeling On Carbon Steel In Sub-Critical And Supercritical CO2 Environments

Picture for Experimental Evaluation Of Corrosion Modeling On Carbon Steel In Sub-Critical And Supercritical CO2 Environments
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Product Number: 51321-16750-SG
Author: Chin-Hua “Jim” Cheng; Raymundo Case
Publication Date: 2021
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This study is aimed to compare the corrosion rate predictions obtained from CO2 corrosion models with experimental results on mild carbon steel (C1018) exposed in brine solutions in both subcritical CO2 and supercritical CO2 (SC-CO2) environments. Corrosion behavior of mild carbon steel is investigated by immersing in a still 1 wt.% NaCl solution at temperatures from 60 – 120oC in both 400 psi (Sub-critical CO2) and in 1600 psi (Supercritical CO2), respectively. The experimental results are evaluated by comparing with the CO2 corrosion calculation algorithms developed by Anderko et al. The corrosion mechanism kinetics are studied by Linear Polarization Resistance (LPR) and Electrochemical Impendence Spectrum (EIS). Surface morphology, element distributions on the surface, and crystal structures of the mild carbon steel are evaluated
The results indicate that the corrosion rate of C1018 in the sub-critical environment at steady state in the LPR measurement showed higher corrosion rate than its theoretical value at high temperature, whereas the corrosion rate of C1018 in supercritical environment at steady state was found to decrease with the temperature and was found consistently lower than the predicted value.

This study is aimed to compare the corrosion rate predictions obtained from CO2 corrosion models with experimental results on mild carbon steel (C1018) exposed in brine solutions in both subcritical CO2 and supercritical CO2 (SC-CO2) environments. Corrosion behavior of mild carbon steel is investigated by immersing in a still 1 wt.% NaCl solution at temperatures from 60 – 120oC in both 400 psi (Sub-critical CO2) and in 1600 psi (Supercritical CO2), respectively. The experimental results are evaluated by comparing with the CO2 corrosion calculation algorithms developed by Anderko et al. The corrosion mechanism kinetics are studied by Linear Polarization Resistance (LPR) and Electrochemical Impendence Spectrum (EIS). Surface morphology, element distributions on the surface, and crystal structures of the mild carbon steel are evaluated
The results indicate that the corrosion rate of C1018 in the sub-critical environment at steady state in the LPR measurement showed higher corrosion rate than its theoretical value at high temperature, whereas the corrosion rate of C1018 in supercritical environment at steady state was found to decrease with the temperature and was found consistently lower than the predicted value.

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Picture for The Effect of High Partial Pressure of CO2 on the Corrosion Mechanism of Carbon Steel in H2O-CO2 Systems
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51318-11623-The Effect of High Partial Pressure of CO2 on the Corrosion Mechanism of Carbon Steel in H2O-CO2 Systems

Product Number: 51318-11623-SG
Author: Tatiana C. Almeida / Oscar R. Mattos / Rogaciano M. Moreira / Merlin C. E. Bandeira
Publication Date: 2018
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The corrosion mechanism of X65 carbon steel was evaluated in water environment by increasing CO2 partial pressure from 1 bar at 24 °C to 110 bar at 40 °C, reaching conditions that include water saturated with supercritical CO2.
Picture for Impact of O2 Content on Corrosion Behavior of X65 Mild Steel in Gaseous, Liquid and Supercritical CO2 environments
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Impact of O2 Content on Corrosion Behavior of X65 Mild Steel in Gaseous, Liquid and Supercritical CO2 environments

Product Number: 51320-14433-SG
Author: Xiu Jiang, Dingrong Qu , Xiaoliang Song
Publication Date: 2020
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CO2 stream in CCS system usually contains impurities, such as water, O2, SO2, NO2, H2S, and other trace substances, which could pose a threat to internal corrosion and integrity of CO2 transportation pipelines. The general and localized corrosion behavior of API 5L X65 mild steel were evaluated using an autoclave both in water-saturated CO2 and CO2-saturated water environments in the presence of varying concentrations of O2. Experiments were performed at 25 °C and 35 °C, 8 MPa and 35 °C, 4 MPa to simulate the conditions encountered during dense, supercritical and gaseous CO2 transport. General corrosion rates were obtained by weight-loss method. The surface morphology of the coupons was examined by scanning electron microscopy (SEM). Results indicated that general corrosion rates at each O2 concentration in CO2-saturated water environment were much higher than those in water-saturated CO2 environment. The corrosion rates did not increase with increasing O2 concentration from 0 to 2000 ppm; instead the corrosion rate reached a maximum with 1000 ppm O2 at 25 °C, 8 MPa and 50 ppm O2 at 35 °C, 8 MPa in water-saturated CO2 environment and 50 ppm at 25 °C, 8 MPa and 100 ppm at 35 °C, 8 MPa in CO2-saturated water environment. However, the change trend of general corrosion rate with O2 content at 35 °C, 4 MPa was different from that in 25 °C and 35 °C, 8 MPa both in water-saturated CO2 and CO2-saturated water environments. Localized corrosion or general corrosion rate of over 0.1 mm/y was identified at each test condition both in a water-saturated CO2 and CO2-saturated water environments. When O2 was added, coupon surfaces were covered by a more porous corrosion product scale. A final series of tests conducted with the addition of 100 ppm and 2000 ppm O2 in CO2 environment with 60% relative humidity (RH) and 80% RH revealed that no localized corrosion was observed and the general corrosion rates were lower than 0.1 mm/y at 25 °C and 35 °C, 8 
Picture for 03345 CORROSION AT HIGH CO2 PRESSURE
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03345 CORROSION AT HIGH CO2 PRESSURE

Product Number: 51300-03345-SG
ISBN: 03345 2003 CP
Author: S. M. Hesjevik, S. Olsen, Statoil, Marion Seiersten
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