Study on Microbiologically Influenced Corrosion Behavior of Novel Cu-Bearing Pipeline Steels

doi:10.11900/0412.1961.2016.00143

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 SHI^1,²,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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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.

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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 (R_LPR) 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 (i_corr) 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)

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	Xianbo SHI
	Dake XU
	Maocheng YAN
	Wei YAN
	Yiyin SHAN
	Ke YANG

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

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

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 (R_LPR) (a) and corrosion current (i_corr) (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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