气相压力对CO<sub>2</sub>/H<sub>2</sub>O气液两相泡状流中20#钢初期腐蚀行为的影响

doi:10.11896/cldb.21110057

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Abstract The effect of CO₂ pressure on the initial corrosion behavior of 20# seamless steel was studied on the dynamic corrosion platform of gas-liquid two-phase flow through weight-loss method, SEM, EDS and XRD. The corrosion rate, micro-structure and composition of corrosion products were studied systematically. Results showed that the corrosion rate decreased first and then increased with the increasing CO₂ pressure under different corrosion time conditions. The corrosion rate reached minimum value when CO₂ pressure was 0.1 MPa under experimental conditions. Under the same CO₂ pressure, the corrosion rate deviation decreased obviously with the extension of time. The density of corrosion products increased with the increasing CO₂ pressure. The corrosion morphology of pipe wall surface under different CO₂ pressure conditions showed two kinds of different characteristics, namely rough area and smooth area. Both types of feature morphology area contain relatively homogeneous corrosion products and protruding corrosion products. The content of C and O in the homogeneous corrosion products was lower than that in the protruding corrosion products, and the content of C and O increased with the increasing CO₂ pressure. The main phases of the corrosion products are FeCO₃, γ-FeOOH and Fe₃O₄.

Key words： gas-liquid two-phases bubble flow CO₂ pressure characteristics of corrosion products composition

Published: Online: 2023-01-03

CLC number:

TG172.3

Fund:National Natural Science Foundation of China(51765035), and Open Fund of Key Laboratory of Advanced Reactor Engineering and Safety, Ministry of Education(ARES-2022-2).

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	Articles by authors
	YANG Guirong
	SONG Wenming
	PAN Zhaoxia
	MA Ying
	HAO Yuan

Cite this article:

YANG Guirong,SONG Wenming,PAN Zhaoxia, et al. Effect of CO₂ Pressure on Initial Corrosion Behavior of 20# Steel Under the Gas-Liquid (CO₂/Aqueous Solution) Two-phases Bubble Flow[J]. Materials Reports, 2022, 36(24): 21110057-6.

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http://www.mater-rep.com/EN/10.11896/cldb.21110057 OR http://www.mater-rep.com/EN/Y2022/V36/I24/21110057

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