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Journal of Chinese Society for Corrosion and protection  2017, Vol. 37 Issue (6): 504-512    DOI: 10.11902/1005.4537.2016.209
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Stress Induced Corrosion Electrochemical Behavior of Steels for Oil and Gas Pipes
Mingyu BAO1, Chengqiang REN1,2(), Jingsi HU1, Bo LIU1, Jiameng LI1, Feng WANG1, Li LIU1, Xiaoyang GUO2
1 School of Materials Science and Engineering, Southwest Petroleum University, Chengdu 610500, China
2 State Key Laboratory of Oil & Gas Reservoir Geology and Exploration, Southwest Petroleum University, Chengdu 610500, China;
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Abstract  

In the oil and gas industry, the effect of stress on corrosion of steels for pipes can not be ignored due to the environment of complex corrosive media and the applied multiple stress loads on pipes during service. The synergistic effect of stress and corrosive medium can not only cause stress corrosion cracking of oil and gas pipes, but also influence corrosion behavior of steels for oil and gas pipes by changing their electrochemical process. Therefore, the research on the stress induced corrosion electrochemical behavior of steels for oil and gas pipes was commented in this paper. The effect of stress on corrosion thermodynamics, corrosion kinetics and corrosion product film of steels for oil and gas pipes was analyzed. At last, the research trend of the stress influenced corrosion electrochemical behavior of steels for oil and gas pipes was discussed.

Key words:  oil and gas pipe      stress induced corrosion      electrochemistry      corrosion product film,      in situ technology     
Received:  25 October 2016     
ZTFLH:  TG172  
  TE973  
Fund: Supported by National Natural Science Foundation of China (51374180)

Cite this article: 

Mingyu BAO, Chengqiang REN, Jingsi HU, Bo LIU, Jiameng LI, Feng WANG, Li LIU, Xiaoyang GUO. Stress Induced Corrosion Electrochemical Behavior of Steels for Oil and Gas Pipes. Journal of Chinese Society for Corrosion and protection, 2017, 37(6): 504-512.

URL: 

https://www.jcscp.org/EN/10.11902/1005.4537.2016.209     OR     https://www.jcscp.org/EN/Y2017/V37/I6/504

Fig.1  Effect of stress on open circuit potential of X80 steel (a)[20] and low carbon bainitic steel (b)[21] (below yield strength)
Fig.2  Effect of tensile stress on open circuit potential of P110 steel[23]
Fig.3  Effect of plastic strain on open circuit potential of 16MnR steel[24]
Fig.4  Corrosion current density (Icorr) of P110 steel under different tensile stresses[23]
Fig.5  Evans polarization graph of P110 steel under different tensile stresses[23](0: 0%σs; 1: 90%σs; 2: 103%σs)
Group Applied stress Corrosion rate / mma-1
1 0 0.3005
2 30%σs 0.3036
3 70%σs 0.3333
4 90%σs 0.3724
Table 1  Corrosion rates of samples under different tensile stresses[40]
Fig.6  Corrosion rate obtained via weight loss method for L80 casing material under different compressive stresses[34]
Fig.7  Surface morphologies of the corrosion product films formed on X80 steel under tensile stresses of 0 MPa (a), 100 MPa (b), 300 MPa (c) and 400 MPa (d)[20]
Fig.8  Surface morphologies of the corrosion product films fromed on HP13Cr steel under compressive stresses of 0%σs(a), 50%σs (b) and 120%σs (c)[35]
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