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Pitting Behavior of L415 Pipeline Steel in Simulated Leaching Liquid Environment

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Abstract

The corrosion behavior and laws of the west-east gas pressure pipeline of L415 steel were studied in simulated leaching liquid. The failure of the L415 steel during the pressure testing process was investigated using electrochemical polarization, electrochemical impedance spectroscopy, and immersion test. The corrosion rate of the L415 steel increased with ion concentration in the leaching liquid. This rate reached about 0.8 mm a−1 and belonged to the severe corrosion grade. Pitting corrosion was observed in various simulated solutions with different aggressive species concentrations. The original ion concentration in the leaching liquid (1×) is the key factor influencing pitting initiation and development. Pitting showed easy nucleation, and its growth rate was relatively slow, in the basic simulating solution of the leach liquid (i.e., the ion content is compactable to the real condition in the rust on the inner steel pipe surface). Pitting was also highly sensitive and easily grew in the solution with doubled ion concentration in the basic simulating solution (2×). A uniform corrosion, instead of pitting, mainly occurred when the ion concentration was up to 10× of the basic solution.

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Acknowledgments

This work was supported by the National Basic Research Program of China (973 Program) (No. 2014CB643300), the Chinese National Science Foundation (Nos. 51131001, 51471034, and 51371036), and the Beijing Higher Education Young Elite Teacher Project.

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Authors and Affiliations

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

    H. X. Wan, X. J. Yang, Z. Y. Liu, D. D. Song, C. W. Du & X. G. Li

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  1. H. X. Wan
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  2. X. J. Yang
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  5. C. W. Du
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Correspondence to Z. Y. Liu.

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Wan, H.X., Yang, X.J., Liu, Z.Y. et al. Pitting Behavior of L415 Pipeline Steel in Simulated Leaching Liquid Environment. J. of Materi Eng and Perform 26, 715–722 (2017). https://doi.org/10.1007/s11665-016-2463-z

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  • DOI: https://doi.org/10.1007/s11665-016-2463-z

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