A Synergistic Acceleration of Corrosion of Q235 Carbon Steel Between Magnetization and Extracellular Polymeric Substances

doi:10.1007/s40195-017-0666-4

Abstract

Abstract:

In this work, surface characterization and electrochemical measurement were employed to investigate the effects of magnetic field (MF) on the corrosion of Q235 carbon steel in a NaCl solution containing sulphate-reducing bacteria (SRB) or extracellular polymeric substances (EPS). Results demonstrated that a 150 mT MF enhanced steel corrosion in a SRB-containing NaCl solution by 202% calculated from weight loss with pitting corrosion as the main corrosion type. Either EPS or MF rendered steel corrosion, but a synergistic interaction between MF and EPS boosted up steel corrosion. This synergistic enhancement could be referred to the alteration in orientation of EPS induced by MF. The presence of higher percentage of chloride ions on the carbon steel surface manifested that MF initiated the erosion of chloride ions on the carbon steel coupon.

Key words: Sulphate-reducing bacteria, Magnetic field, Extracellular polymeric substances, Microbiologically influenced corrosion

Hong-Wei Liu, Da-Ke Xu, Bi-Juan Zheng, Muhammad Asif, Fu-Ping Xiong, Guo-An Zhang, Hong-Fang Liu. A Synergistic Acceleration of Corrosion of Q235 Carbon Steel Between Magnetization and Extracellular Polymeric Substances[J]. Acta Metallurgica Sinica (English Letters), 2018, 31(5): 456-464.

Figures/Tables 15

Fig. 1 Schematic diagram of set-up for electrochemical measurements with MF

Table 1 Weight loss of Q235 carbon steels after 8 days of incubation in the presence of SRB with and without MF in 3 wt% NaCl solution

MF (mT)	Average mass loss (g cm^-2)	Average size (μm)	Number of pits (pit mm^-2)
0	0.0213	6 ± 2	50 ± 10
150	0.0431	30 ± 10	550 ± 50

Fig. 2 Images of coupons surface after exposure to 3 wt% NaCl solution after removing biofilms and corrosion products in the presence of SRB after 8 days of incubation: a 0 mT MF; b 150 mT MF

Fig. 3 Polarization curves of Q235 carbon steel in 3 wt% NaCl solution in the presence of SRB after 8 days of incubation

Table 2 Fitted results of polarization curves in Fig. 3 with SRB in the absence and presence of SRB after 8 days of incubation in 3 wt% NaCl solution (E corr: free corrosion potential; b a and b c correspond to the anodic and cathodic Tafel slopes, respectively)

Static magnetic field (mT)	E _corr (mV)	i _corr (mA cm^-2)	b _a (mV dec^-1)	b _c (mV dec^-1)
0	- 600	0.16	110	- 393
150	- 598	0.20	111	- 204

Fig. 4 Nyquist plots of coupons with SRB in the absence and presence of MF after 8 days of incubation in 3 wt% NaCl solution (Z′ and Z″ are the real and imaginary parts, respectively)

Fig. 5 Equivalent circuit used to fit EIS data (R s is the solution resistance, R f and C f the resistance and the capacitance of the biofilm, respectively. R ct and C dl correspond to a charge transfer resistance and a double layer capacitance, respectively)

Table 3 Fitted results of EIS data corresponding to Figs. 4 and 8 with SRB and EPS in the absence and presence of MF after 8 days of incubation in 3 wt% NaCl solution

	SRB + MF		EPS + MF
	0 mT	150 mT	Blank	EPS	MF	EPS + MF
R _ct (Ω cm^-2)	852	673	1200	1780	2050	430

Fig. 6 UV spectrum of EPS extracted from SRB culture medium a, FT-IR spectra of EPS, EPS adsorbed on steel surface in the absence and presence of 150 mT mF b, and corresponding second-derivative transformations of IR spectra c

Fig. 7 Cyclic double-polarization curves of Q235 carbon steel under different corrosion conditions in 3 wt% NaCl solution (the coupon without EPS and MF is as blank)

Table 4 Fitted results of cyclic double-polarization curves in 3 wt% NaCl solution after 8 days of incubation under different corrosion conditions

Situation	ΔE _corr (V)	i _corr (mA cm^-2)
Blank	0.37 ± 0.01	0.28
EPS	0.42 ± 0.02	0.19
SMF	0.38 ± 0.01	0.21
EPS + SMF	0.45 ± 0.03	0.36

Fig. 8 Nyquist plots of coupons under different corrosion conditions after 8 days of incubation in 3 wt% NaCl solution

Fig. 9 SEM images of coupons under different corrosion conditions after 8 days of incubation in 3 wt% NaCl solution containing EPS in the absence a, c and presence b, d of MF at low a, b and high c, d magnification

Table 5 EDS analysis results corresponding to SEM images in Fig. 9 in the absence and presence of MF in EPS-containing testing solution

MF (mT)	Situation	O (wt%)	Cl (wt%)	Fe (wt%)
0	EPS	6.63	0.72	70.06
150	EPS + MF	26.96	7.91	44.37

Fig. 10 Schematic diagram of EPS steel corrosion in EPS-containing testing solution in the absence a and presence b of MF

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