Effect of CO2 Partial Pressure on 20# Steel in CO2/H2O Two Phase Slug Flow
YANG Guirong1, SONG Wenming2, DONG Xuejiao1, ZHANG Yufu2,WANG Fuqiang1, LI Jian3,MA Ying1
1 State Key Laboratory of Advanced Processing and Recycling of Nonferrous Metals, Lanzhou University of Technology, Lanzhou 730050; 2 Lanpec Technologies Limited, Lanzhou 730070; 3 Wuhan Research Institute of Materials Protection, Wuhan 430030
Abstract: The effects of CO2 partial pressure on the corrosion behavior of 20# steel in CO2/H2O gas liquid two phase slug flow was studied by means of SEM, EDS, XRD, XPS and so on. The corrosion rate, corrosion appearance, the composition of corrosion products and the structure characteristics of corrosion film were analyzed respectively. The results manifested that the corrosion rate increased with the increasing CO2 partial pressure, and the minimum and maximum value of corrosion rate are 1.160 9 mm/a and 1.898 8 mm/a at 0.04 MPa and 0.28 MPa, respectively. With the increasing CO2 partial pressure, the corrosion products of the upper wall formed a larger of nodular product. The corrosion products at the bottom pipe wall formed by the initial dense monolayer film consisted of the spherical particle, and gradually transformed into a dense inner layer film and a sheet loose outer layer with a net connected crack composed of sheet shape products. EDS element analysis demonstrated the corrosion products on the upper and bottom walls were composed of three kinds of elements including Fe, C and O. XPS peak pattern showed that C 1s, O 1s and Fe 2p presented three fitting peaks. Combined with XRD analysis, the main compositions of corrosion products were Fe3C, FeCO3, Fe2O3, Fe3O4, FeOOH.
杨贵荣,宋文明,董雪娇,张玉福,王富强,李 健,马 颖. CO2分压对20#钢在CO2/H2O气液两相塞状流中腐蚀行为的影响[J]. 《材料导报》期刊社, 2018, 32(9): 1557-1563.
YANG Guirong, SONG Wenming, DONG Xuejiao, ZHANG Yufu,WANG Fuqiang, LI Jian,MA Ying. Effect of CO2 Partial Pressure on 20# Steel in CO2/H2O Two Phase Slug Flow. Materials Reports, 2018, 32(9): 1557-1563.
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2018, Vol. 32 
