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Research Article

The stress corrosion cracking behavior of high-strength mooring chain steel in SO2-polluted coastal atmosphere

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  • Received: 26 June 2020Revised: 9 September 2020Accepted: 11 September 2020Available online: 12 September 2020
  • 21Cr2NiMo steel is widely used to stabilize offshore oil platforms, however, it suffers from stress corrosion cracking (SCC). Herein, we studied the SCC behavior of 21Cr2NiMo steel in SO2-polluted coastal atmospheres. Electrochemical tests revealed that the addition of SO2 increases the corrosion current. Rust characterization showed that the SO2 addition densities the corrosion products and promotes pitting. Furthermore, the slow strain rate tests demonstrated high susceptibility to SCC at high SO2 contents. Fracture morphologies revealed that the stress-corrosion cracks initiated at corrosion pits and the crack propagation showed transgranular and intergranular cracking modes. In conclusion, the SCC is mix-controlled by anodic dissolution and hydrogen embrittlement mechanisms.
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The stress corrosion cracking behavior of high-strength mooring chain steel in SO2-polluted coastal atmosphere

  • Corresponding authors:

    Zhi-yong Liu    E-mail: liuzhiyong7804@ustb.edu.cn

    Cui-wei Du    E-mail: dcw@ustb.edu.cn

  • 1. Corrosion and Protection Center, University of Science and Technology Beijing, Beijing 10083, China
  • 2. Zhengmao Group Co., Ltd., Zhenjiang 212000, China

Abstract: 21Cr2NiMo steel is widely used to stabilize offshore oil platforms, however, it suffers from stress corrosion cracking (SCC). Herein, we studied the SCC behavior of 21Cr2NiMo steel in SO2-polluted coastal atmospheres. Electrochemical tests revealed that the addition of SO2 increases the corrosion current. Rust characterization showed that the SO2 addition densities the corrosion products and promotes pitting. Furthermore, the slow strain rate tests demonstrated high susceptibility to SCC at high SO2 contents. Fracture morphologies revealed that the stress-corrosion cracks initiated at corrosion pits and the crack propagation showed transgranular and intergranular cracking modes. In conclusion, the SCC is mix-controlled by anodic dissolution and hydrogen embrittlement mechanisms.

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