期刊
JOURNAL OF MATERIALS SCIENCE & TECHNOLOGY
卷 34, 期 12, 页码 2480-2491出版社
JOURNAL MATER SCI TECHNOL
DOI: 10.1016/j.jmst.2018.05.020
关键词
Pipeline steel; Cu alloying; Cu-rich nano-precipitation; Microbiologically influenced corrosion; Pitting corrosion
资金
- Shenyang Science and Technology Research Funding [18-013-0-53]
- Shenzhen Science and Technology Research Funding [JCYJ20160608153641020]
Microbiologically influenced corrosion (MIC) is becoming a serious problem for buried pipelines. Developing environmentally friendly strategies for MIC control is increasingly urgent in oil/gas pipeline industry. Copper (Cu) in steels can not only provide aging precipitation strengthening, but also kill bacterium, offering a special biofunction to steels. Based on the chemical composition of traditional X80 pipeline steel, two Cu-bearing pipeline steels (1% Cu and 2% Cu) were fabricated in this study. The microstructure, mechanical properties and antibacterial property against sulphate-reducing bacteria (SRB) and Pseudomonas aeruginosa (P. aeruginosa) were studied. It was found that the novel pipeline steel alloyed by 1%Cu exhibited acicular ferrite microstructure with nano-sized Cu-rich precipitates distribution in the matrix, resulting in better mechanical properties than the traditional X80 steel, and showed good MIC resistance as well. The pitting corrosion resistance of 1% Cu steel in as-aged condition was significantly better than that of X80 steel. A possible antibacterial mechanism of the Cu-bearing pipeline steel was proposed. (C) 2018 Published by Elsevier Ltd on behalf of The editorial office of Journal of Materials Science & Technology.
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