Citation: CAI Feng, LIU Wei, FAN Xue-Hua, ZHANG Jing, LU Min-Xu. Electrochemical Corrosion Behavior of X70 Pipeline Steel in Turbulence Zone under Jet Impingement at High Temperature and High Pressure CO₂ Environment[J]. Acta Physico-Chimica Sinica, ;2013, 29(05): 1003-1012. doi: 10.3866/PKU.WHXB201302251 shu

Electrochemical Corrosion Behavior of X70 Pipeline Steel in Turbulence Zone under Jet Impingement at High Temperature and High Pressure CO₂ Environment

CAI Feng ¹ ,
LIU Wei ^1, ,
FAN Xue-Hua ² ,
ZHANG Jing ¹ ,
LU Min-Xu ¹

1.
1 Institute for Advanced Materials and Technology, University of Science and Technology Beijing, Beijing 100083, P. R. China;
2 Beijing Branch of China Petroleum Engineering Co., Ltd., Beijing 100085, P. R. China

Received Date: 13 November 2012
Available Online: 25 February 2013
Fund Project: 国家重大科技专项经费(2008ZX05026-003-04)资助 (2008ZX05026-003-04)

The corrosion behavior of X70 pipeline steel in the turbulent zone was investigated in situ with a micro-electrode technique using loop jet impingement under high temperature and high pressure CO₂ environment. The morphology of the corrosion product formed on the surface and corrosion behavior of X70 steel after different periods were investigated by scanning electron microscopy and in situ electrochemical methods, respectively. The electrochemical behavior of X70 steel was closely related to the evolution of corrosion scales on the steel surface. The surface of the steel changed gradually from the presence of both substrate and corrosion product to loose, porous corrosion scales during the first 12 h. After 12 h, the corrosion scales were mainly composed of inner and outer scales. Because of the effect of high wall shear stress in the turbulent zone, the porous, less-protective outer scale was thinned and then removed from the steel surface. Consequently, the surface was increasingly covered by the compact inner scale, which decreases the corrosion rate of the steel considerably. Correspondingly, during the first 12 h, the corrosion potential E_corr and linear polarization resistance R_p of the sample decreased continuously. Meanwhile, electrochemical impedance spectroscopy (EIS) exhibited high- and medium-frequency capacitive loops and a low-frequency inductive loop. Analysis of EIS revealed that the resistance R_f of the corrosion film increased slowly and charge transfer resistance R_t decreased steadily, while the double-layer capacitance C_dl and corrosion film capacitance C_f decreased rapidly. After 12 h, the protectiveness of the corrosion scales improved with time, and thus the E_corr and R_p increased. As the inductive component weakened with time and finally disappeared at 48 h, EIS changed to double capacitive loops. The R_f, Rr, and C_dl increased quickly. Furthermore, the C_f stabilized.
- CO₂ corrosion,
- Turbulent zone,
- Corrosion electrochemistry,
- Corrosion morphology,
- X70 pipeline steel
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Electrochemical Corrosion Behavior of X70 Pipeline Steel in Turbulence Zone under Jet Impingement at High Temperature and High Pressure CO2 Environment

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通讯作者: 陈斌, bchen63@163.com

Electrochemical Corrosion Behavior of X70 Pipeline Steel in Turbulence Zone under Jet Impingement at High Temperature and High Pressure CO₂ Environment