Microbial corrosion resistance of a novel Cu-bearing pipeline steel

• 来源期刊: 材料科学技术（英文版）
• 年，卷（期）: 2018,（12）
• 页码范围: 2480-2491
• 页数: 12页
• 语种: 英文

摘要

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.