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Journal of Chinese Society for Corrosion and protection  2015, Vol. 35 Issue (3): 220-226    DOI: 10.11902/1005.4537.2014.077
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Effect of O2 Concentration on Corrosion Rate of Steels in Supercritical CO2
Yucheng ZHANG1,Xinhua JU1,Xiaolu PANG2,Kewei GAO2()
1. ShouGang Research Institute of Technology, Beijing 100043, China
2. Department of Materials Physics and Chemistry, University of Science and Technology Beijing, Beijing 100083, China
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Abstract  

The carbon capture and storage (CCS) in geological reservoirs is now considered to be one of the main options for achieving deep reductions in CO2 emissions. Generally, the purity of captured CO2 is only about 95% and can contain trace gases such as O2, CO, SOx and NOx. In the presence of a water phase, these trace gases can contribute to the corrosiveness of high pressure-high temperature CO2 (supercritical CO2) systems. In this study, corrosion experiments of supercritical CO2 with various amounts of O2 were carried out to study the effect of small concentrations of O2 on the corrosion rate of two kinds of carbon steels C75 and X65 and three kinds of stainless steels 13Cr, 2205 and 904L in aqueous supercritical CO2 at 80 ℃ under 12 MPa. The decay kinetics of small starting O2 concentrations were investigated and used for the experiments with continuous replenishment of used-up O2. The results indicated that constant O2 concentrations in supercritical CO2, even trace of O2 (1.50×10-6), could enhance the corrosion rate of carbon steels tremendously (more than 100 mm/a). Under this condition, even the corrosion rate of 13Cr stainless steel obviously increased. However, surprisingly, with high O2 concentrations seemed to exhibit passivation effect and the corrosion rates for carbon steels and 13Cr stainless steel were relatively low. The 2205 and 904L stainless steels were unaffected by addition of O2 and showed high resistance (<0.01 mm/a) to the aqueous supercritical CO2 corrosion.
Key words:  supercritical CO2      O2      carbon steel      stainless steel      corrosion rate     
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Yucheng ZHANG
Xinhua JU
Xiaolu PANG
Kewei GAO

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Yucheng ZHANG,Xinhua JU,Xiaolu PANG,Kewei GAO. Effect of O2 Concentration on Corrosion Rate of Steels in Supercritical CO2. Journal of Chinese Society for Corrosion and protection, 2015, 35(3): 220-226.

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https://www.jcscp.org/EN/10.11902/1005.4537.2014.077     OR     https://www.jcscp.org/EN/Y2015/V35/I3/220

Steel C Si Mn P S N Cr Mo Ni Cu
C75 0.2~0.4 0.1~0.3 1.0~3.0 ≤0.01 ≤0.01 --- 0.02~0.04 0.01~0.03 0.05~0.07 ---
X65 ≤0.1 0.2~0.4 1.0~3.0 ≤0.02 ≤0.01 ≤0.01 --- --- --- ---
13Cr 0.17~0.22 0.3~0.5 0.2~0.4 ≤0.04 ≤0.04 --- 12.5~13.5 --- --- ---
2205 ≤0.03 ≤1.0 ≤2.0 ≤0.03 ≤0.02 0.08~0.20 21.0~23.0 2.5~3.5 4.5~6.5 ---
904L ≤0.02 ≤0.70 ≤2.0 ≤0.03 ≤0.015 0.04~0.15 19.0~21.0 4.0~5.0 24.0~26.0 1.0~2.0
Table 1  Chemical compositions of tested steels
Fig.1  Variations of O2 concentration with exposure time in the conditions with the initial O2 concentration of 1.37×10-3 (a) and 2.69×10-3 (b)
Fig.2  Macro-surface morphologies of C75 (a), X65 (b), 13Cr (c), 2205 (d) and 904L (e) steels under supercritical CO2 condition with one-time injection of 2.69×10-3 O2 (real surface size: 50 mm×10 mm)
O2 concentration C75 X65 13Cr 2205 904 L
1.37×10-3 8.1 8.1 0.014 ＜0.01 ＜0.01
2.69×10-3 25.0 36.2 0.01 ＜0.01 ＜0.01
Table 2  Corrosion rates of the tested steels under supercritical CO2 conditions with one-time injection of 1.37×10-3 and 2.69×10-3 O2, respectively
Fig.3  Variation of O2 concentration with exposure time in the supercritical CO2 condition with the initial O2 concentration of 5.7×10-2
Fig.4  Corrosion rates of carbon steels (a) and 13Cr steel (b) in the supercritical CO2 conditions with various O2 concentrations
Fig.5  O2 concentration vs time in the process of manual injection of 3.50×10-4 O2
Fig.6  O2 concentration vs time in the process of automatic injection of 1.50×10-6 (a) and 3.50×10-4 (b) O2
Fig.7  Corrosion rates of carbon steels (a) and 13Cr steel (b) in the supercritical CO2 conditions with dynamic injection of O2
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