Corrosion Behavior of Low Alloy Heat-resistant Steel T23 in High-temperature Supercritical Carbon Dioxide

doi:10.11902/1005.4537.2020.115

Journal of Chinese Society for Corrosion and protection

2021, Vol. 41

Issue (3): 327-334 DOI: 10.11902/1005.4537.2020.115

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Corrosion Behavior of Low Alloy Heat-resistant Steel T23 in High-temperature Supercritical Carbon Dioxide

LI Ruitao¹, XIAO Bo¹, LIU Xiao¹, ZHU Zhongliang¹, CHENG Yi², LI Junwan³, CAO Jieyu³, DING Haimin¹, ZHANG Naiqiang¹(

)

^1.Key Laboratory of Power Station Energy Transfer Conversion and System of Ministry of Education, North China Electric Power University, Beijing 102206, China
^2.State Key Laboratory of Efficient and Clean Coal-fired Utility Boilers, Harbin Boiler Co. Ltd. , Harbin 150046, China
^3.Xi'an Thermal Power Research Institute Co. , Ltd, Xi'an 710054, China

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Abstract

The long term oxidation behavior of T23 steel, one of the low alloy heat resistant steels was examined in high-temperature supercritical CO₂ at 650 ℃/25 MPa for 1000 h, so that, the oxidation kinetics of T23 steel was acquired. Meanwhile, the oxide scales formed on the steel were characterized by SEM, XRD and EDS. The results showed that the oxidation kinetics of T23 steel oxidized in high-temperature s-CO₂ at 650 ℃/25 MPa followed the cubic law during the entire test duration. Meanwhile, the time index was also obtained by data analysis process and proved to be 0.30. The oxide scales formed on all the samples exposed for different time duration had a typical double-layered structure. Namely，the outer layer was porous and composed of Fe₃O₄. The inner layer composed of Fe_3-_xCr_xO₄ and was much denser than the outer layer. Also, the oxide scale formed on T23 steel in high-temperature s-CO₂was more likely to peel off and the exfoliation-like corrosion could be found obviously on the surface of the corroded steel.

Key words: T23 steel high-temperature oxidation high-temperature s-CO₂ exfoliated corrosion

Received: 08 July 2020

ZTFLH:

TG178

Fund: National Key R&D Program of China(2017YFB0601804);Beijing Municipal Natural Science Foundation(2194085)

Corresponding Authors: ZHANG Naiqiang E-mail: zhnq@ncepu.edu.cn

About author: ZHANG Naiqiang, E-mail: zhnq@ncepu.edu.cn

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	Ruitao LI
	Bo XIAO
	Xiao LIU
	Zhongliang ZHU
	Yi CHENG
	Junwan LI
	Jieyu CAO
	Haimin DING
	Naiqiang ZHANG

Cite this article:

LI Ruitao, XIAO Bo, LIU Xiao, ZHU Zhongliang, CHENG Yi, LI Junwan, CAO Jieyu, DING Haimin, ZHANG Naiqiang. Corrosion Behavior of Low Alloy Heat-resistant Steel T23 in High-temperature Supercritical Carbon Dioxide. Journal of Chinese Society for Corrosion and protection, 2021, 41(3): 327-334.

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https://www.jcscp.org/EN/10.11902/1005.4537.2020.115 OR https://www.jcscp.org/EN/Y2021/V41/I3/327

Fig.1 Schematic diagram of the high-temperature s-CO₂ oxidation testing facility

Fig.2 Mass gain changes as a function of test duration for T23 steel samples exposed to high-temperature s-CO₂ at 650 °C under 25 MPa

Fig.3 Surface morphologies of the oxide scales formed on T23 steel samples exposed to high-temperature s-CO₂ at 650 °C under 25 MPa for 200 h (a), 600 h (b), 800 h (c) and 1000 h (d)

Fig.4 Surface morphologies of the spallation area on T23 sample (1#) after exposing to high-temperature s-CO₂ for 1000 h and higher magnification view for different locations at this area: (a) spallation area and higher magnification views of location 1 (b), location 2 (c), location 3 (d) and location 4 (e) in Fig.4a

Fig.5 Surface morphology of location 1 formed on T23 sample (2#) after exposing to high-temperature s-CO₂ at 650 ℃ under 25 MPa for 1000 h (a) and higher magnification view for a small part (black box) of this area (b)

Fig.6 Morplology of spallation (a) and EDS elemental mapping results (b~d) of the area showed in Fig.4a

Fig.7 Cross-sectional morphologies (a1~c1) and compositions profil (a2~c2) of the oxide scales formed on T23 steel samples after 1000 h exposing to high-temperature s-CO₂ at 650 ℃ under 25 MPa for 200 h (a), 600 h (b) and 1000 h (c)

Table 1 Oxide layer thickness formed on T23 samples after exposing to high temperature s-CO₂ for different time

Fig.8 EDS elemental mapping results of the area showed in Fig.6c: (a) O, (b) Fe, (c) Cr

Fig.9 X-ray diffraction spectra of the oxide scales formed on T23 steel exposed to high-temperature s-CO₂ at 650 ℃ under 25 MPa for different time

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