Microbiologically Induced Corrosion of X80 Pipeline Steel in a Near-Neutral pH Soil Solution

doi:10.1007/s40195-014-0173-9

Abstract

Abstract:

MIC of X80 pipeline steel in a near-neutral pH soil solution in the presence and absence of sulfate-reducing bacteria (SRB) was monitored by electrochemical techniques and microbiological tests. The results show that soil solution is more close to the complex soil environment around pipeline. The activity of SRB leads to the shift of the phase response to low frequency, the decrease of electrolyte resistance and the alteration of dielectric constant of the film. Both the activity and metabolite of SRB influence the corrosion behavior of the steel. The steel surface undergoes localized attack in the SRB-inoculated soil solution, whereas only slight uniform corrosion occurs in the sterile soil solution.

Key words: Sulfate-reducing bacteria, Pipeline steel X80, Electrochemical impedance spectroscopy (EIS), Scanning electron microscopy

Tang-Qing Wu, Mao-Cheng Yan, De-Chun Zeng, Jin Xu, Chang-Kun Yu, Cheng Sun, Wei Ke. Microbiologically Induced Corrosion of X80 Pipeline Steel in a Near-Neutral pH Soil Solution[J]. Acta Metallurgica Sinica (English Letters), 2015, 28(1): 93-102.

Figures/Tables 14

References 37

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C	Mn	Si	P	S	Mo	Ni	Cr
0.07	1.82	0.19	0.007	0.023	0.010	0.17	0.026
Cu	V	Nb	Ti	Al	N	B	Fe
0.020	0.002	0.056	0.012	0.028	0.004	0.0001	Bal.

C	Mn	Si	P	S	Mo	Ni	Cr
0.07	1.82	0.19	0.007	0.023	0.010	0.17	0.026
Cu	V	Nb	Ti	Al	N	B	Fe
0.020	0.002	0.056	0.012	0.028	0.004	0.0001	Bal.

Position	C	O	Fe	S	P	Si	Ca	Cr	Mn
1	23.34	7.29	67.62	-	-	-	-	0.36	1.19
2	54.43	22.68	11.63	10.81	-	0.15	0.31	-	-
3	41.07	27.24	18.21	13.02	-	-	0.46	-	-
4	34.77	29.45	26.00	7.24	0.76	0.40	0.94	-	0.43

Position	C	O	Fe	S	P	Si	Ca	Cr	Mn
1	23.34	7.29	67.62	-	-	-	-	0.36	1.19
2	54.43	22.68	11.63	10.81	-	0.15	0.31	-	-
3	41.07	27.24	18.21	13.02	-	-	0.46	-	-
4	34.77	29.45	26.00	7.24	0.76	0.40	0.94	-	0.43

Time (day)	R _s (Ω cm²)	Y _f (S s ⁿ /cm²)	n _f	R _f (Ω cm²)	Y _dl (S s ⁿ /cm²)	n _dl	R _ct (Ω cm²)	W (mS s⁵/cm²)	B (s⁵)
0.25	218.4				0.0005957	0.4836	4,287	4.739	15.05
2	144.1	0.0002505	0.7701	2,967	0.0003582	0.3895	4,148
5	193.2	0.0002197	0.8105	2,857	0.0009250	0.2983	4,078
10	198.6	0.0002687	0.7812	12,010	0.0002710	0.4151	75,350
30	210.7	0.0001095	0.8105	12,560	0.0001331	0.2479	76,340
60	248.4	0.0002420	0.8940	13,000	0.0001255	0.2544	59,210