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Acta Metall Sin  2017, Vol. 53 Issue (2): 153-162    DOI: 10.11900/0412.1961.2016.00143
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Study on Microbiologically Influenced Corrosion Behavior of Novel Cu-Bearing Pipeline Steels
Xianbo SHI1,2,Dake XU1,Maocheng YAN1,Wei YAN1,Yiyin SHAN1,Ke YANG1()
1 Institute of Metal Research, Chinese Academy of Sciences, Shenyang 110016, China
2 University of Chinese Academy of Sciences, Beijing 100049, China
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Abstract  

Microbiologically influenced corrosion (MIC) is a major corrosion related problem for steel pipelines. The great loss caused by microbiologically influenced corrosion (MIC) on buried pipelines has been paid considerable attention domestically and internationally. Various physical, chemical or biological strategies have been used for MIC control, including biocides, coatings, cathodic protection and biocompetitive exclusion. These strategies have limitations of being expensive, subject to environmental restrictions, and sometimes inefficient. There is an urgent need for oil industry to develop environmentally friendly strategies for microbial corrosion control. Cu could play many benefical effects in steels, such as exerting a vigorous effect on hardenability, enhancing strength via precipitation strengthening, improving fatigue resistance, reducing susceptibility of hydrogen embrittlement, promoting formation protective layer etc.. Cu is well known for its inherent antimicrobial properties and is the focus of interest for potential application as a component in antibacterial materials. The Cu-bearing antibacterial stainless steel, characterized by continuous release of Cu ions with antibacterial function, provides analogy to develop a new type of MIC resistance pipeline steel. In this work, three different Cu contents (1.06Cu,1.46Cu,2.00Cu, mass fraction, %) pipeline steels, named 1.0Cu, 1.5Cu and 2.0Cu, were fabricated by making proper Cu alloying designs for X80 steel that currently used in oil/gas industry. Study on antibacterial performance and MIC behavior of novel Cu-bearing pipeline steels against Escherichiacoli (E.coli), Staphylococcusaureus (S.aureus) and Sulphate reducing bacteria (SRB) was carried out by antibacterial tests, electrochemistrical monitor, corrosion product analyses and confocal laser scanning microscope (CLSM). The results showed that Cu-bearing pipeline steels had strong antibacterial performance against E.coli and S.aureus compared with X80 steel. 1.0Cu steel with the microstructure of polygonal ferrite showed excellent resistance to SRB with remarkable strength enhancement by nano-scale Cu-rich precipitates and good impact toughness compared with X80 steel. Cu-rich precipitates in Cu-bearing pipeline steels were found to be responsible for the antibacterial capability. The linear polarization resistances (RLPR) of both X80 and 1.0Cu steels in the soil-extract solution with SRB were dramatically decreased after 2 d, leading to the corrosion current density (icorr) value of X80 steel was much higher than that of 1.0Cu steel. The corrosion product analysis results showed that much biofilm produced by SRB was the reason that many pits and larger pit depth on X80 steel than that of 1.0Cu steel.

Key words:  pipeline steel      Cu      microbiologically influenced corrosion      Cu-rich phase      antibacterial performance     
Received:  18 April 2016     
Fund: Supported by National Key Technology Support Program (No.2011BAE25B03) and National Natural Science Foundation of China (No.51271175)

Cite this article: 

Xianbo SHI,Dake XU,Maocheng YAN,Wei YAN,Yiyin SHAN,Ke YANG. Study on Microbiologically Influenced Corrosion Behavior of Novel Cu-Bearing Pipeline Steels. Acta Metall Sin, 2017, 53(2): 153-162.

URL: 

https://www.ams.org.cn/EN/10.11900/0412.1961.2016.00143     OR     https://www.ams.org.cn/EN/Y2017/V53/I2/153

Steel C Si Mn Mo Cu Ni Nb S P Cr V Fe
1.0Cu 0.031 0.14 1.09 0.31 1.06 0.32 0.05 0.0011 0.005 0.32 - Bal.
1.5Cu 0.019 0.12 1.03 0.31 1.46 0.31 0.05 0.0011 0.005 0.31 - Bal.
2.0Cu 0.023 0.13 1.06 0.30 2.00 0.30 0.05 0.0010 0.005 0.30 - Bal.
X80 0.028 0.28 1.90 0.22 0.20 0.29 0.08 0.0020 0.012 - 0.03 Bal.
Table 1  Chemical compositions of the experimental steels (mass fraction / %)
Fig.1  OM images of as-rolled Cu-bearing pipeline steels and X80 steel (a, c, e, g), and corresponding TEM images aged at 500 ℃ for 1 h (b, d, f, h)s
(a, b) 1.0Cu steel (c, d) 1.5Cu steel (e, f) 2.0Cu steel (g, h) X80 steel
Steel As-rolled As-aged (500 ℃, 1 h)
σs / MPa σb / MPa δ / % AkV / J σs / MPa σb / MPa δ / % AkV / J
1.0Cu 443 651 30.0 141** 646 722 26.5 114**
1.5Cu 513 645 28.0 82** 728 794 24.0 60**
2.0Cu 608 759 25.0 66** 832 909 20.5 42**
X80 608 677 23.5 134** * * * *
Table 2  Mechanical properties of the experimental steels
Fig.2  Antibacterial rates against Escherichiacoli (E.coli) and Staphylococcusaureus (S.aureus) of Cu-bearing pipeline steels under aged and rolled conditions, respectively
Fig.3  Representative photos of antibacterial performance against E.coli on petridishes cultured with X80 steel and Cu-bearing pipeline steels
(a) X80 steel (b) 1.0Cu steel (c) 1.5Cu steel (d) 2.0Cu steel
Fig.4  Representative photos of antibacterial performance against S.aureus on petridishes cultured with X80 steel and Cu-bearing pipeline steels
(a) X80 steel (b) 1.0Cu steel, as-aged (c) 1.5Cu steel, as-aged (d) 2.0Cu steel, as-aged s
(e) 1.0Cu steel, as-rolled (f) 1.5Cu steel, as-rolled (g) 2.0Cu steel, as-rolled
Fig.5  Variations of linear polarization resistances (RLPR) (a) and corrosion current (icorr) (b) with exposure time for X80 and 1.0Cu steels in the soil-extract solution with sulphate reducing bacteria (SRB) at 30 ℃
Fig.6  Morphologies (a, b) and EDS analyses (c, d) of 1.0Cu (a, c) and X80 (b, d) steels exposed to soil-extract solution with SRB after 20 d immersion
Fig.7  Morphologies of 1.0Cu steel (a) and X80 steel (b) exposed to soil-extract solution with SRB after removing corrosion products
Fig.8  3D images of the largest pit morphology on 1.0Cu (a) and X80 (b) steels exposed to soil-extract solution with SRB after 20 d immersion
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