Effect of Microstructure on Corrosion Behavior of X70 Steel in 3.5%NaCl Solution with SRB

doi:10.11902/1005.4537.2017.001

Journal of Chinese Society for Corrosion and protection

2017, Vol. 37

Issue (2): 168-174 DOI: 10.11902/1005.4537.2017.001

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Effect of Microstructure on Corrosion Behavior of X70 Steel in 3.5%NaCl Solution with SRB

Yu TENG,Xu CHEN(

),Chuan HE,Yichuang WANG,Bing WANG

School of Petroleum Engineering, Liaoning Shihua University, Fushun 113001, China

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Abstract

X70 steels with different microstructure were obtained by heat treating at 1050 ℃ for 3 h and subsequently air cooling, water cooling and furnace cooling respectively. Corrosion behavior of the X70 steels with different microstructure in 3.5%(mass fraction)NaCl solution with sulfate reducing bacteria (SRB) was studied by means of potentiodynamic polarization measurement and electrochemical impedance spectroscopy (EIS) as well as SEM and EDS. The results showed that the as received X70 steel shows a microstructure composed of ferrite and pearlite; the air cooling steel composed of globular pearlite distributed along the ferrite grain boundaries; furnace cooling steel composed of lamellar pearlite and proeutectoid ferrite and water cooling one composed mainly of lath martensite and a small amount of blocky ferrite. In the initial stage of corrosion in 3.5%NaCl solution with sulfate reducing bacteria (SRB), the test steels were all covered with a compact biofilm, which played a roll in protection to the substrate. However fractures occurred for the biofilms formed on the water cooling- and air cooling-steels after immersion for 8 and 10 d respectively, while the biofilms kept integrity on the furnace cooling- and as received-steels. The corrosion resistance of the furnace cooling- steel was best, and the water cooling-steel was worst in 3.5%NaCl solution with SRB.

Key words: X70 steel microstructure sulfate reducing bacteria electrochemical corrosion

Received: 03 January 2017

Fund: Supported by National Natural Science Foundation of China (51201009) and Natural Science Foundation ofLiaoning Province (2013020078)

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	Yu TENG
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	Bing WANG

Cite this article:

Yu TENG,Xu CHEN,Chuan HE,Yichuang WANG,Bing WANG. Effect of Microstructure on Corrosion Behavior of X70 Steel in 3.5%NaCl Solution with SRB. Journal of Chinese Society for Corrosion and protection, 2017, 37(2): 168-174.

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https://www.jcscp.org/EN/10.11902/1005.4537.2017.001 OR https://www.jcscp.org/EN/Y2017/V37/I2/168

Fig.1 Microstructures of X70 steel before (a) and after heat treatments with air cooling (b), furnace cooling (c) and water cooling (d)

Fig.2 SEM images and corresponding EDS results of untreated (a) and air cooling (b), furnace cooling (c) and water cooling (d) heat treated X70 steel samples immersed for 14 d in 3.5%NaCl solution containing SRB

Fig.3 Open circle potentials of untreated and heat-treated X70 steel samples in 3.5%NaCl solution with SRB

Fig.4 Polarization curves of untreated and heat-treated X70steel samples in 3.5%NaCl solution with SRB

Table 1 Fitting parameters of polarization curves

Fig.5 Nyqusit (a) and Bode (b) plots of untreated and heat-treated X70 steel samples in 3.5%NaCl solution with SRB

Fig.6 Equivalent circuit for fitting EIS

Table 2 Fitting results of EIS

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