Studies of Composition and Structure of CO2 Corrosion Film of X56 Steel in the Medium of CO2 and Salt Water
来源期刊：材料热处理学报2004年第5期
论文作者：LUO Ping-ya LI Chun-fu ZHANG Xian-ju ZHANG Ying LU Dong-li DAI Jia-lin WANG Bing
关键词：X56 steel; CO2 corrosion; corrosion film; petroleum transportation; composition and structure;
摘 要：The X56 steel samples was corroded in the medium of salt water solution at the conditions of CO2 partial pressure PCo2 0.5 to 2.0 MPa, temperature 80 ℃ and flow rate 1.4m/s. Corrosion weigh loss, composition and structure, morphology and phase of corrosion films of the samples were investigate by SEM, EDS, XRD and XPS. The results indicated that the corrosion degree was accelerated with increasing PCo2. The intense localised corrosion occurred on the surface of samples.The corrosion films mainly comprised of FeCO3 and complex phase products (Fe, Ca....)CO3. There exists serious pitting on the metal substrates under the corrosion film. The theoretic and experimental analyses indicate this is caused by existed micropores or micro holes in films, which have the function of mass transportation.
LUO Ping-ya1，LI Chun-fu1，ZHANG Xian-ju2，ZHANG Ying2，LU Dong-li2，DAI Jia-lin2，WANG Bing2
(1.State key Laboratory of Oil and Gas Reservoir Geology and Exploitation, Southwest Petroleum Institute, Chengdu, China;
2.Material Science and Engineering College, Southwest Petroleum Institute, Chengdu, China)
摘要:The X56 steel samples was corroded in the medium of salt water solution at the conditions of CO2 partial pressure PCo2 0.5 to 2.0 MPa, temperature 80 ℃ and flow rate 1.4m/s. Corrosion weigh loss, composition and structure, morphology and phase of corrosion films of the samples were investigate by SEM, EDS, XRD and XPS. The results indicated that the corrosion degree was accelerated with increasing PCo2. The intense localised corrosion occurred on the surface of samples.The corrosion films mainly comprised of FeCO3 and complex phase products (Fe, Ca....)CO3. There exists serious pitting on the metal substrates under the corrosion film. The theoretic and experimental analyses indicate this is caused by existed micropores or micro holes in films, which have the function of mass transportation.
关键词:X56 steel; CO2 corrosion; corrosion film; petroleum transportation; composition and structure;
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