Effect of CO<sub>2</sub> Pressure on Corrosion Behavior of 20 Steel in CO<sub>2</sub>/AqueousTwo-Phase Stratified Flow Liquid Phase Medium

ZHANG Zhenghai; YANG Guirong; SONG Wenming; MA Ying; LI Yamin

doi:10.11973/jxgccl202010007

Materials and Mechanical Engineering > 2020 > 44(10): 33-37,42. > DOI: 10.11973/jxgccl202010007

ZHANG Zhenghai, YANG Guirong, SONG Wenming, MA Ying, LI Yamin. Effect of CO₂ Pressure on Corrosion Behavior of 20 Steel in CO₂/AqueousTwo-Phase Stratified Flow Liquid Phase Medium[J]. Materials and Mechanical Engineering, 2020, 44(10): 33-37,42. DOI: 10.11973/jxgccl202010007

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Effect of CO₂ Pressure on Corrosion Behavior of 20 Steel in CO₂/AqueousTwo-Phase Stratified Flow Liquid Phase Medium

1. State Key Laboratory of Advanced Processing and Recycling of Nonferrous Metals, Lanzhou University of Technology, Lanzhou 730050, China;
2. Lanpec Technologies Limited, Lanzhou 730070, China

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Received Date: November 10, 2019
Revised Date: September 01, 2020

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Abstract

The effect of CO₂ pressure (0.03-0.26 MPa) on corrosion behavior of 20 steel in CO₂/aqueous two-phase stratified flow liquid phase medium was studied by weight loss method, scanning electron microscopy, and X-ray diffraction. The results show that the corrosion rate of 20 steel increased rapidly when the CO₂ pressure increased from 0.03 MPa to 0.11 MPa, and the corrosion rate increased slowly after the CO₂ pressure exceeded 0.11 MPa. The corrosion rates of 20 steel under different test conditions were greater than 1.193 mm·a^-1, indicating that 20 steel was severely corroded. 20 steel surface was covered with uniform and loose floc corrosion products, and a net floc structure was formed. The corrosion products mainly consisted of iron oxidation and FeCO₃. With the increase of CO₂ pressure, the compactness of the corrosion product film increased, the particle size of the corrosion products decreased, and the morphology of the corrosion product changed from flocculent, needle-like, and granular to scaly.
- 20 steel,
- two-phase stratified flow,
- CO₂ corrosion,
- corrosion products

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Effect of CO2 Pressure on Corrosion Behavior of 20 Steel in CO2/AqueousTwo-Phase Stratified Flow Liquid Phase Medium

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Effect of CO₂ Pressure on Corrosion Behavior of 20 Steel in CO₂/AqueousTwo-Phase Stratified Flow Liquid Phase Medium