高强系泊链钢在二氧化硫污染海洋大气环境下的应力腐蚀行为

柳蒙浩; 刘智勇; 杜翠薇; 詹晓琴; 杨小佳; 李晓刚

doi:10.1007/s12613-020-2192-z

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文章导航 > 矿物冶金与材料学报（英文） > 2022 > 29(6): 1186-1196

Menghao Liu, Zhiyong Liu, Cuiwei Du, Xiaoqin Zhan, Xiaojia Yang, and Xiaogang Li, Stress corrosion cracking behavior of high-strength mooring-chain steel in the SO₂-polluted coastal atmosphere, Int. J. Miner. Metall. Mater., 29(2022), No. 6, pp. 1186-1196. https://doi.org/10.1007/s12613-020-2192-z

Cite this article as:

Menghao Liu, Zhiyong Liu, Cuiwei Du, Xiaoqin Zhan, Xiaojia Yang, and Xiaogang Li, Stress corrosion cracking behavior of high-strength mooring-chain steel in the SO2-polluted coastal atmosphere, Int. J. Miner. Metall. Mater., 29(2022), No. 6, pp. 1186-1196. https://doi.org/10.1007/s12613-020-2192-z

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研究论文

高强系泊链钢在二氧化硫污染海洋大气环境下的应力腐蚀行为

1)
北京科技大学腐蚀与防护中心，北京 100083，中国
2)
正茂集团有限责任公司，镇江 212000，中国

通讯作者:
刘智勇 E-mail: dcw@ustb.edu.cn

杜翠薇 E-mail: dcw@ustb.edu.cn

文章亮点

(1) 系统地研究了不同含量硫含量对高强系泊链钢海洋大气下应力腐蚀行为的影响规律.

(2) 系统地研究了不同含量硫含量对高强系泊链钢海洋大气下腐蚀行为的影响规律.

(3) 阐明了高强系泊链钢在含硫污染大气环境下的应力腐蚀机理

中文摘要

随着陆地油气资源枯竭，越来越多的国家正在寻求开发利用海洋资源。为避免海上石油平台在海啸、台风和巨浪等恶劣环境倒塌，抗拉强度高达1000 MPa的R5级系泊链钢被广泛应用于海上石油平台。然而，以往的研究证明应力腐蚀开裂是导致系泊链钢失效的主要因素。因此，研究系泊钢的应力腐蚀过程具有重要意义。本文旨在研究海洋大气环境下硫化物浓度对系泊链钢应力腐蚀行为的影响规律及机制。本文采用了慢应变速率拉伸、电子背散射衍射和扫描电镜研究了硫化物浓度对系泊链钢应力腐蚀行为的影响规律，采用了电化学极化、X射线光电子能谱和X射线能谱等手段研究了不同硫化物浓度对系泊链钢腐蚀行为的影响，以此为基础阐明了高强系泊链钢在海洋大气环境下的应力腐蚀机制。研究结果表明，随着模拟海洋大气环境中SO₂污染程度的增加，腐蚀电流密度增大，腐蚀产物致密性更高，更易萌生点蚀。随着模拟海洋大气环境中SO₂污染程度的增加，系泊链钢的应力腐蚀敏感性增大。断口结果表明应力腐蚀裂纹萌生于点蚀，裂纹以沿晶和穿晶混合的方式扩展。由此总结系泊链钢在该环境下的应力腐蚀由阳极溶解机制和氢脆机制共同控制。

关键词:

Research Article

Stress corrosion cracking behavior of high-strength mooring-chain steel in the SO₂-polluted coastal atmosphere

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Abstract

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 increased the corrosion current. Rust characterization showed that SO₂ addition densified the corrosion products and promoted pitting. Furthermore, slow strain rate tests demonstrated a high susceptibility to SCC in 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, SCC is mix-controlled by anodic dissolution and hydrogen embrittlement mechanisms.
- corrosion;
- marine atmospheres;
- mooring-chain steel;
- SO₂-polluted coastal atmospheres;
- stress-corrosion cracking

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