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Open AccessArticle

Influence of O2 on the Erosion-Corrosion Performance of 3Cr Steels in CO2 Containing Environment

by Lei Xia 1, Yan Li 2,3,*, Leilei Ma 4, Hongmei Zhang 1, Na Li 1 and Zhengyi Jiang 1,5,*
1
School of Material and Metallurgy, University of Science and Technology Liaoning, Anshan 114051, China
2
State Key Laboratory of Metal Material for Marine Equipment and Application, Anshan 114009, China
3
Iron & Steel Research Institutes of Ansteel Group Corporation, Anshan 114009, China
4
Department of Information Engineering, Hebei GEO University, Shijiazhuang 050031, China
5
School of Mechanical, Materials, Mechatronic and Biomedical Engineering, University of Wollongong, Wollongong, NSW 2522, Australia
*
Authors to whom correspondence should be addressed.
Materials 2020, 13(3), 791; https://doi.org/10.3390/ma13030791
Received: 14 January 2020 / Revised: 2 February 2020 / Accepted: 4 February 2020 / Published: 9 February 2020
(This article belongs to the Section Corrosion and Materials Degradation)
With the introduction of O2 during oil and gas production, the erosion-corrosion rate of tubing steels increases; the objective of this report is to explore the reason for this. Erosion–corrosion experiments were performed in environments of CO2 and CO2–O2, respectively. Macrographs, microstructures, and the compositions of erosion-corrosion scales were investigated using a digital camera, scanning electron microscope (SEM), Kevex-SuperDry energy spectrometer (EDS) and X-ray diffraction (XRD). The results show that the erosion-corrosion products are composed of large FeCO3 particles and some amorphous product in the CO2 environment, while they are made up of FeCO3, Fe2O3, Fe3O4, and bits of amorphous product in the CO2–O2 environment. The interface between erosion-corrosion scales and the substrate of 3Cr steel is smooth, and Cr enrichment obviously exists in the erosion-corrosion products in the CO2 condition. However, the erosion-corrosion scale is loose and porous with little Cr enrichment in the CO2–O2 environment, which makes the protectiveness of the erosion–corrosion scale weak, and pitting corrosion occurs. The addition of O2 may destroy the protective FeCO3 scale and Cr enrichment in the erosion-corrosion scale, which may be the main reason for the decline in the level of protectiveness of the erosion-corrosion scale, making it weak in terms of preventing the corrosive medium from diffusing to the substrate. View Full-Text
Keywords: erosion-corrosion; 3Cr steel; CO2; O2 erosion-corrosion; 3Cr steel; CO2; O2
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Xia, L.; Li, Y.; Ma, L.; Zhang, H.; Li, N.; Jiang, Z. Influence of O2 on the Erosion-Corrosion Performance of 3Cr Steels in CO2 Containing Environment. Materials 2020, 13, 791.

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