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A New Understanding of Stress Corrosion Cracking Mechanism of X80 Pipeline Steel at Passive Potential in High-pH Solutions

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Acta Metallurgica Sinica (English Letters) Aims and scope

Abstract

Susceptibilities to stress corrosion cracking (SCC) of X80 pipeline steel in relatively concentrated carbonate/bicarbonate solutions with different chloride ion concentrations or pH value at a passive potential of −200 mV vs SCE were investigated by slow strain rate tensile test. In order to explore the SCC mechanism and the evaluation criterion for the SCC susceptibility of the steel in passive state, electrochemical measurements were taken. Potentiodynamic polarization curves were obtained at different potential sweep rates, and electrochemical impedance spectroscopy measurements were taken after fast polarization to the passive potential. The effects of chloride ion and pH on SCC behaviors of X80 steel at the passive potential were also discussed. The results showed that the SCC mechanism of X80 pipeline steel was greatly influenced by the passive film formed in these solutions. The SCC behaviors followed the film suppressed anodic dissolution mechanism in these circumstances, because the filming process accounted for a considerable proportion of the overall electrode process. The criteria for evaluating the SCC susceptibility of the steel at passive potential were proposed and validated. Decreasing in the concentration of chloride ion or increasing in pH value resulted in the reduction in SCC susceptibility. The existence of chloride ion greatly lowered the passivation tendency and the film stability, while its concentration determined the dissolution rate of the steel matrix. Higher pH value was responsible for the stable and tenacious passive films and the high repassivation capability. It was also inclined to lower the anodic dissolution rate at crack tips by retarding the cathodic oxygen reduction.

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Acknowledgments

This work was financially supported by the National Natural Science Foundation of China (Nos. 51471034, 51131001 and 51171025). Many thanks to Dr. Ri Qiu for the fruitful discussion.

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Authors and Affiliations

  1. Corrosion and Protection Center, University of Science and Technology Beijing, Beijing, 100083, China

    Lin Fan, Zhi-Yong Liu, Cui-Wei Du & Xiao-Gang Li

  2. State Key Laboratory for Marine Corrosion and Protection, Luoyang Ship Material Research Institute, Qingdao, 266101, China

    Lin Fan, Wei-Min Guo & Jian Hou

Authors
  1. Lin Fan
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  2. Zhi-Yong Liu
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  3. Wei-Min Guo
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  4. Jian Hou
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Correspondence to Zhi-Yong Liu.

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Available online at http://link.springer.com/journal/40195

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Fan, L., Liu, ZY., Guo, WM. et al. A New Understanding of Stress Corrosion Cracking Mechanism of X80 Pipeline Steel at Passive Potential in High-pH Solutions. Acta Metall. Sin. (Engl. Lett.) 28, 866–875 (2015). https://doi.org/10.1007/s40195-015-0270-4

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  • DOI: https://doi.org/10.1007/s40195-015-0270-4

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