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51312-01322-Effects of CO2 Phase SO2 content and flow on the Corrosion of CO2 Transmission Pipeline Steel

Picture for Effects of CO2 Phase SO2 content and flow on the Corrosion of CO2 Transmission Pipeline Steel
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Product Number: 51312-01322-SG
ISBN: 01322 2012 CP
Author: Fernando Farelas
Publication Date: 2012
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Results from previous works demonstrated that significant corrosion was observed with 1% SO2 under the current guideline of water content in a supercritical CO2 phase (650 ppm). Considering real situations of CO2 transport pipelines effects of CO2 phase impurity concentration and flow should be evaluated in order to establish clear understanding of corrosion risk for such pipelines. Thus in the present study the corrosion property of carbon steel was evaluated by using an autoclave with different CO2 phases (liquid and supercritical) concentrations of SO2 (< 1%) and flow velocities. The corrosion rate of samples was determined by weight loss measurements. The surface morphology and the composition of the corrosion product layers were analyzed by using surface analytical techniques (SEM EDS and IFM). Results showed that the corrosion rate decreased with decreasing SO2 content in the supercritical CO2 phase with 650 ppm of water. In addition significant localized corrosion was observed when CO2 phase was liquid.
Results from previous works demonstrated that significant corrosion was observed with 1% SO2 under the current guideline of water content in a supercritical CO2 phase (650 ppm). Considering real situations of CO2 transport pipelines effects of CO2 phase impurity concentration and flow should be evaluated in order to establish clear understanding of corrosion risk for such pipelines. Thus in the present study the corrosion property of carbon steel was evaluated by using an autoclave with different CO2 phases (liquid and supercritical) concentrations of SO2 (< 1%) and flow velocities. The corrosion rate of samples was determined by weight loss measurements. The surface morphology and the composition of the corrosion product layers were analyzed by using surface analytical techniques (SEM EDS and IFM). Results showed that the corrosion rate decreased with decreasing SO2 content in the supercritical CO2 phase with 650 ppm of water. In addition significant localized corrosion was observed when CO2 phase was liquid.
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Exposure tests were performed at normal and high pressure where CO2 is supercritical or in dense phase. The focus was set on the corrosion process of condensate as drops on the surface of carbon steels in CO2 with impurities at 278 K
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