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Effect of Cl− Concentration on the Corrosion Behavior of 16Mn Steel in Saturated H2S/CO2 Solution

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Abstract

The corrosion behavior of 16Mn steel was studied in saturated H2S or H2S/CO2 solutions containing different Cl− concentrations at 80 °C. The microstructure and chemical composition of the corrosion products were investigated through scanning electron microscopy, energy-dispersive X-ray spectroscopy, EPMA, and X-ray diffraction. Results showed that the corrosion rate decreased with increasing Cl− concentration in saturated H2S or H2S/CO2 solution at pH 4. Conversely, the corrosion rate increased with increasing Cl− concentration in saturated H2S solution at pH 6. The relative H+ concentration decreased because of the increase of Cl− concentration at pH 4, and Cl− acted as a catalyst in the corrosive medium at pH 6 because the net H+ concentration decreased obviously compared with the condition at pH4. Cl− promoted the formation of Fe-deficient iron sulfide at pH 4, and the opposite effect was observed in the nearly neutral solution. The corrosion rate increased firstly with increasing Cl− concentration and then decreased in the saturated H2S/CO2 solution at pH 6. The corrosion products were mainly composed of two kinds of iron sulfide. Sulfide FeS1−x was a kind of tetragonal crystal, whereas the other was the hexagonal/monoclinic iron sulfide Fe1−xS. The corrosion film that was mainly composed of FeS1−x did not confer a protective effect on the base metal. The atomic ratio of Fe/S was more than 1 for FeS1−x. The appearance of sulfide FeS1−x resembled a square block or small, needle-like, flocculent particles. The atomic ratio of Fe/S was less than 1 for Fe1−xS, and the corrosion film mainly composed of Fe1−xS conferred some protective property on the base metal. The sulfide FeS1−x exhibited a long claviform morphology with a hexagonal or quadrilateral cross-sectional shape.

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Authors and Affiliations

  1. State Key Laboratory of Advanced Processing and Recycling of Nonferrous Metals, Lanzhou University of Technology, Lanzhou, 730050, China

    Wenming Song  (宋文明), Guirong Yang  (杨贵荣), Bingbing Liao, Ying Ma & Yuan Hao

  2. Lanzhou Petroleum Machinery Institute, Lanzhou, 730000, China

    Wenming Song  (宋文明)

  3. Wuhan Research Institute of Materials Protection, Wuhan, 430030, China

    Jian Li

Authors
  1. Wenming Song  (宋文明)
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  2. Guirong Yang  (杨贵荣)
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  3. Bingbing Liao
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  4. Jian Li
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  5. Ying Ma
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  6. Yuan Hao
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Correspondence to Guirong Yang  (杨贵荣).

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Funded by National Natural Science Foundation of China (No.51765035)

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Song, W., Yang, G., Liao, B. et al. Effect of Cl− Concentration on the Corrosion Behavior of 16Mn Steel in Saturated H2S/CO2 Solution. J. Wuhan Univ. Technol.-Mat. Sci. Edit. 33, 1205–1215 (2018). https://doi.org/10.1007/s11595-018-1954-1

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  • DOI: https://doi.org/10.1007/s11595-018-1954-1

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