Citation: LIN Xue-Qiang, LIU Wei, ZHANG Jing, DONG Shuai, ZHANG Hai-Long, LI Xiao-Bo, XU Chuan-Chuan, LU Min-Xu. Characteristics of Corrosion Scale of 3Cr Steel at High Temperature and Pressure in an O₂ and CO₂ Environment[J]. Acta Physico-Chimica Sinica, ;2013, 29(11): 2405-2414. doi: 10.3866/PKU.WHXB201309171 shu

Characteristics of Corrosion Scale of 3Cr Steel at High Temperature and Pressure in an O₂ and CO₂ Environment

1.
1 Corrosion and Protection Center, Institute for Advanced Materials and Technology, University of Science and Technology Beijing, Beijing 100083, P. R. China;
2 China Oilfield Services Limited, Tianjin 300450, P. R. China

Received Date: 9 July 2013
Available Online: 17 September 2013

The corrosion behavior of 3Cr steel in atmospheres composed of only O₂ or CO₂ or a combination of O₂ and CO₂ was investigated using an autoclave. The characteristics of the corrosion scale of the 3Cr steel were investigated by X-ray diffraction (XRD), scanning electron microscopy (SEM), energy dispersive X-ray spectrometry (EDS), and electrochemical methods. The corrosion scale developed in the combined O₂ and CO₂ atmosphere was composed of FeCO₃, Fe₂O₃, and Fe₃O₄, and had a loose texture with a large number of pores. The surface and subsurface corrosion film resistance (R_f1, R_f2) and charge transfer resistance (R_t) were all lower than those found in samples treated in only CO₂ or O₂ atmospheres. The double-layer capacitance (C_dl) and corrosion film capacitance (C_f1, C_f2) were higher for the sample treated in the combined O₂ and CO₂ atmosphere than for those treated in only CO₂ or O₂ atmospheres. The resistance to formation of a corrosion film on the 3Cr steel in the combined O₂and CO₂ atmosphere was significantly lower than in the CO₂ only atmosphere. The corrosion mechanism of 3Cr steel is proposed: In the O₂ and CO₂ environment the corrosion is proceed by the formation of several corrosion products causing a loose film to develop. The Cr(OH)₃ layer which can greatly improve the protection of the corrosion film formed in a CO₂ only corrosion environment is not found in the O₂ and CO₂ environment, thus promoted the corrosion process of hydrogen evolutional and oxidation corrosion in acid medium.
- O₂ corrosion,
- CO₂ corrosion,
- 3Cr steel,
- Corrosion rate,
- Corrosion morphology
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沈阳化工大学材料科学与工程学院沈阳 110142

Characteristics of Corrosion Scale of 3Cr Steel at High Temperature and Pressure in an O2 and CO2 Environment

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通讯作者: 陈斌, bchen63@163.com

Characteristics of Corrosion Scale of 3Cr Steel at High Temperature and Pressure in an O₂ and CO₂ Environment