CO2分压对20#钢在CO2/H2O气液两相塞状流中腐蚀行为的影响

doi:10.11896/j.issn.1005-023X.2018.09.022

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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.

Key words： CO₂ partial pressure two phase slug flow corrosion rate corrosion product film

Published: 10 May 2018 Online: 2018-07-06

CLC number:

TG172.3

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	Articles by authors
	YANG Guirong
	SONG Wenming
	DONG Xuejiao
	ZHANG Yufu
	WANG Fuqiang
	LI Jian
	MA Ying

Cite this article:

YANG Guirong,SONG Wenming,DONG Xuejiao, et al. Effect of CO₂ Partial Pressure on 20# Steel in CO₂/H₂O Two Phase Slug Flow[J]. Materials Reports, 2018, 32(9): 1557-1563.

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https://www.mater-rep.com/EN/10.11896/j.issn.1005-023X.2018.09.022 OR https://www.mater-rep.com/EN/Y2018/V32/I9/1557

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