Corrosion Inhibition of X80 Steel in Simulated Marine Environment with Marinobacter aquaeolei

doi:.10.1007/s40195-019-00912-4

Abstract

Abstract:

In the present study, a novel bacterium (Marinobacter aquaeolei) was examined for its corrosion inhibiting behaviour against X80 pipeline steel. Electrochemical results showed that X80 steel immersed in the solution inoculated with M. aquaeolei possessed very high corrosion resistance compared to that of abiotic control. Besides, scanning electron microscopy, confocal laser scanning microscopy and energy-dispersive X-ray spectroscopy were employed to analyse the corrosion product and the biofilm formed on the metal surface. Fourier-transform infrared spectroscopy was also applied to determine the composition of extracellular polymeric substances (EPS). Above results indicated that the corrosion inhibition efficiency observed in biotic medium was very high (91%), proving that M. aquaeolei was an effective inhibitive agent for the corrosion of carbon steel. The inhibition was credited to the formation of bacterial biofilm and the compact protective layer of the secreted EPS. Thus, this study will introduce a natural, environmentally friendly and cost-effective system for the corrosion control of the carbon steel.

Key words: X80 pipeline steel, Corrosion inhibition, Marinobacter aquaeolei

M. Saleem Khan, Dake Xu, Dan Liu, Yassir Lekbach, Ke Yang, Chunguang Yang. Corrosion Inhibition of X80 Steel in Simulated Marine Environment with Marinobacter aquaeolei[J]. Acta Metallurgica Sinica (English Letters), 2019, 32(11): 1373-1384.

Figures/Tables 10

Fig. 1 Open-circuit potential a, linear polarization resistance b, potentiodynamic polarization curves c for the X80 steel in the biotic and abiotic medium

Fig. 2 Nyquist and Bode plots for the material in sterile medium a, c, bacteria inoculated medium b, d

Table 1 EIS parameters for X80 steel in sterile medium

Immersion time (day)	R_s (Ω cm²)	Q_CPE (Ω^-1 Sⁿ cm^-2)	R_ct (kΩ cm²)
1	14.85	1.90?×?10^-4	11.20
4	14.60	7.76?×?10^-4	7.20
7	21.10	7.13?×?10^-4	22.70
14	10.77	1.65?×?10^-4	40.60

Table 2 EIS parameters for X80 steel in M. aquaeolei broth

Immersion time (day)	R_s (Ω cm²)	C_b (μF cm^-2)	R_b (kΩ cm²)	C_dl (μF cm^-2)	R_ct (kΩ cm²)
1	14.01	73.64	0.66	98.01	1.80
4	12.12	71.00	1.30	83.70	84.40
7	13.68	72.00	1.88	80.10	140.00
14	14.50	83.00	1.97	85.00	114.00

Fig. 3 SEM images of X80 steel immersed in bacteria inoculated medium a, b and in sterile medium c, d for 7 and 14 days, respectively

Fig. 4 CLSM live/dead cells test in the M. aquaeolei inoculated medium for different exposure time: a 24 h, b 48 h, c 7 days, d 14 days

Fig. 5 Pitting corrosion analysis for the samples in biotic medium a, b and in sterile medium c, d for 7 and 14 days, respectively

Fig. 6 High-resolution XPS spectra of Fe 2p in abiotic medium a and biotic medium b, FTIR spectrum of the extracellular polymeric substance c

Fig. 7 OCP a, LPR b and potentiodynamic polarization curves c measured for the cell-free experiment 3.9 Fourier-Transform Infrared Spectroscopy (FTIR)

Fig. 8 Mechanistic diagram for the corrosion inhibition of X80 steel by M. aquaeolei biofilm and secreted EPS

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