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Influence of Inclusion on Corrosion Behavior of E36 Grade Low-Alloy Steel in Cargo Oil Tank Bottom Plate Environment

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Abstract

Corrosion behavior of low-alloy steel was investigated in simulated cargo oil tank (COT) bottom plate service environment (10% NaCl solution, pH = 0.85). The corrosion behavior of inclusion was studied by in-situ scanning electron microscopy (SEM) and energy dispersive spectroscopy (EDS). It was found that pitting corrosion was inclined to occur around the place where inclusions exist. After initial corrosion, an area of 10 — 20 µm in diameter was formed as a circinate cathode around the edge of inclusion. MnS inclusion dissolved in the simulated COT corrosion solution before low-alloy steel matrix, and pitting was formed at the place where MnS dissolved. TiO2 inclusion dissolved in the simulated COT corrosion solution after low-alloy steel matrix, and pitting was formed at the place where steel matrix dissolved. The corrosion tended to occur at the area where the curvature radius of inclusion is smaller. The size of round TiO2 inclusions had little influence on corrosion behavior in this certain environment.

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Authors and Affiliations

  1. National Engineering Research Center of Advanced Rolling Technology, University of Science and Technology Beijing, 100083, Beijing, China

    Hui-bin Wu (Doctor, Associate Professor), Jin-ming Liang (Doctor Candidate), Di Tang, Xiao-tong Liu, Peng-cheng Zhang & Yuan-jie Yue

Authors
  1. Hui-bin Wu
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  2. Jin-ming Liang
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  3. Di Tang
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  4. Xiao-tong Liu
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  5. Peng-cheng Zhang
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  6. Yuan-jie Yue
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Corresponding authors

Correspondence to Hui-bin Wu or Jin-ming Liang.

Additional information

Foundation Item: Item Sponsored by National Science and Technology Major Project of the Ministry of Science and Technology of China (2011ZX05016-004); National Key Technology Research and Development Program of the Ministry of Science and Technology of China (2011BAE25B00)

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Wu, Hb., Liang, Jm., Tang, D. et al. Influence of Inclusion on Corrosion Behavior of E36 Grade Low-Alloy Steel in Cargo Oil Tank Bottom Plate Environment. J. Iron Steel Res. Int. 21, 1016–1021 (2014). https://doi.org/10.1016/S1006-706X(14)60177-1

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  • DOI: https://doi.org/10.1016/S1006-706X(14)60177-1

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