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Stress corrosion cracking of 2205 duplex stainless steel in H2S–CO2 environment

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Abstract

Stress corrosion cracking (SCC) behavior of 2205 duplex stainless steel (DSS) in H2S–CO2 environment was investigated by electrochemical measurements, slow strain rate test (SSRT), and scanning electron microscopy (SEM) characterization. Results demonstrated that the passive current density of steel increases with the decrease of solution pH and the presence of CO2. When solutions pH was 2.7, the steel SCC in the absence and presence of CO2 is expected to be a hydrogen-based process, i.e., hydrogen-induced cracking (HIC) dominates the SCC of the steel. The presence of CO2 in solution does not affect the fracture mechanism. However, the SCC susceptibility is enhanced when the solution is saturated simultaneously with H2S and CO2. With elevation of solution pH to 4.5, the hydrogen evolution is inhibited, and dissolution is involved in cracking process. Even in the presence of CO2, the additional cathodic reduction of H2CO3 would enhance the anodic reaction rate. Therefore, in addition to the hydrogen effect, anodic dissolution plays an important role in SCC of duplex stainless steel at solution pH of 4.5.

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Acknowledgements

This work was supported by Chinese National Science and Technology Infrastructure Platforms Construction Project (No. 2005DKA10400), and Canada Research Chairs Program.

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Authors and Affiliations

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

    Z. Y. Liu, C. F. Dong, X. G. Li & Q. Zhi

  2. Department of Mechanical & Manufacturing Engineering, University of Calgary, Calgary, AB, T2N 1N4, Canada

    Y. F. Cheng

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  1. Z. Y. Liu
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  2. C. F. Dong
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  3. X. G. Li
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  4. Q. Zhi
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  5. Y. F. Cheng
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Correspondence to X. G. Li or Y. F. Cheng.

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Liu, Z.Y., Dong, C.F., Li, X.G. et al. Stress corrosion cracking of 2205 duplex stainless steel in H2S–CO2 environment. J Mater Sci 44, 4228–4234 (2009). https://doi.org/10.1007/s10853-009-3520-x

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  • DOI: https://doi.org/10.1007/s10853-009-3520-x

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