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Journal of Chinese Society for Corrosion and protection  2016, Vol. 36 Issue (3): 212-218    DOI: 10.11902/1005.4537.2015.116
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Effect of SRB on Corrosion Behavior of X70 Pipeline Steel in Near-neutral pH Solution
Boqiang SONG,Xu CHEN(),Guiyang MA,Rui LIU
School of Petroleum Engineering, Liaoning Shihua University, Fushun 113001, China
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Abstract  

The corrosion behavior of X70 pipeline steel in a near-neutral pH solution NS4 with and without sulfate-reducing bacteria (SRB) respectively was studied by means of electrochemical impedance spectroscopy (EIS), potentiodynamic polarization and microscopic observation. The results showed that the corrosion rate of X70 steel increased with time in NS4 solution without SRB; The growth process of the SRB in the solution NS4 can be divided into three phases: logarithmic phase (1~3 d), stable growth phase (4~7 d) and death phase (7~14 d). The influence of SRB on the corrosion rate of X70 pipeline steel in the solution NS4 with SRB was related to the growth process of SRB. A compact biological film could form on the steel surface in the stage of logarithmic phase and stable growth phase, which was conducive to enhancing the protectiveness of corrosion products on the steel and therewith the corrosion rate of X70 steel in the NS4 with SRB was lower than that without SRB. While the corrosion of X70 steel in the NS4 with SRB in the death phase was more serious than that without SRB, while the scale of corrosion products became thicker gradually, then the biological film broken and therewith the corrosion rate increased.
Key words:  X70 pipeline steel      sulfate reducing bacteria      growth cycle      electrochemical corrosion     
Received:  24 August 2015     
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Boqiang SONG
Xu CHEN
Guiyang MA
Rui LIU

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Boqiang SONG,Xu CHEN,Guiyang MA,Rui LIU. Effect of SRB on Corrosion Behavior of X70 Pipeline Steel in Near-neutral pH Solution. Journal of Chinese Society for Corrosion and protection, 2016, 36(3): 212-218.

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https://www.jcscp.org/EN/10.11902/1005.4537.2015.116     OR     https://www.jcscp.org/EN/Y2016/V36/I3/212

Fig.1  Microstructure of X70 pipeline steel
Fig.2  Growth chart determined by OD method for SRB in the solution of NS4
Fig.3  Surface morphologies of X70 steel after removal of the rust layers formed in NS4 solutions without (a~c) and with (d~f) SRB for 4 d (a, d), 7 d (b, e) and 14 d (c, f)
Fig.4  Evolutions of open circle potential of X70 steel in NS4 solutions with and without SRB
Fig.5  Nyqusit (a), Bode and phase angle (b) plots of X70 steel immersed in NS4 solution without SRB for different time
Fig.6  Nyqusit (a), Bode and phase angle (b) plots of X70 steel immersed in NS4 solution with SRB for different time
Fig.7  Equivalent circuits for EIS of X70 steel during immersion in NS4 solutions with (a) and without (b) SRB
Condition Time / d Rs / Ωcm2 Qf / μFcm-2 nf Rf / Ωcm2 Qdl / μFcm-2 ndl Rt / Ωcm2
Without SRB 1 40.96 --- --- --- 2.859×10-4 0.8455 1.7×104
4 43.86 --- --- --- 3.021×10-4 0.8232 1.4×104
7 36.35 --- --- --- 2.659×10-4 0.8118 1.1×104
10 55.21 --- --- --- 0.8366×10-4 0.8562 1.03×104
14 49.66 --- --- --- 3.072×10-4 0.8016 8.1×103
With SRB 1 155.8 17.77×10-4 0.46 1.192 0.61×10-4 1 1.2×103
4 117.9 2.646×10-4 1 69.08 26.39×10-4 0.6047 1.6×103
7 88.93 2.408×10-4 1 337.3 7.843×10-4 1 926
10 76.75 10.52×10-4 1 198.3 48.18×10-4 1 500
14 91.1 12.07×10-4 1 125.2 114.6×10-4 1 425
Table 1  Fitting electrochemical parameters for X70 steel after immersed in NS4 solutions with SRB and without SRB for different time
Fig.8  Polarization curves of X70 steel after immersion in NS4 solutions for different time
Condition Ecorr / mV Icorr / μAcm-2
Without SRB / 4 d -754.8 3.432
With SRB / 4 d -721.0 1.856
Without SRB / 14 d -813.9 21.151
With SRB / 14 d -856.0 30.650
Table 2  Fitting results of the potentiodynamic polarization curves
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