Effect of Alternating Current and Sulfate-Reducing Bacteria on Corrosion of X80 Pipeline Steel in Soil-Extract Solution

Qing, Yongchang; Bai, Yunlong; Xu, Jin; Wu, Tangqing; Mao, Yan; Sun, Cheng

doi:10.3390/ma12010144

Cited by 19 publications

(8 citation statements)

References 34 publications

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“…The corrosion of buried pipeline steel in the soil seriously threatens the safe operation of the pipeline [1,2,3]. Currently, various factors affecting soil corrosion of pipeline steel, including temperature, pH, water content, salinity, microbial and other factors have been extensively studied [4,5,6,7,8,9,10,11], but most studies have focused on the anode process of corrosion. It is well known that the soil corrosion of pipeline steel is an electrochemical process.…”

Section: Introductionmentioning

confidence: 99%

Coupling Effects of pH and Dissolved Oxygen on the Corrosion Behavior and Mechanism of X80 Steel in Acidic Soil Simulated Solution

et al. 2019

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In an acidic red soil environment, the corrosion mechanism of X80 steel may be closely related to the pH value and oxygen content, but it has not yet formed a systematic understanding. In this paper, the coupling effects of pH and dissolved oxygen on the corrosion behavior and mechanism of X80 steel in an acidic soil simulated solution were further analyzed by electrochemical methods and three-dimensional video microscope. Results showed that the hydrogen reduction reaction was almost the only cathode process in the anoxic and low pH system, and small and dense pits were present on the electrode surface. pH value increased, the pits decreased, but the size of pits increased. In the oxygen-adequate system, oxygen-consuming (OC) corrosion preferentially occurred, and a protective corrosion product layer (including FeOOH, Fe3O4, etc.) might be formed accordingly, but the proportion of hydrogen evolution (HE) increased and the product layer had defects at a low pH environment. The specific corrosion mechanism of X80 steel in an acidic soil simulated solution is described in the relevant models.

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Section: Introductionmentioning

confidence: 99%

Coupling Effects of pH and Dissolved Oxygen on the Corrosion Behavior and Mechanism of X80 Steel in Acidic Soil Simulated Solution

et al. 2019

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“…The soil near the X80 pipeline in service in southwest China was put into a drying box to air-dry to remove debris, and then continued to be dried in an oven at 120°C for 10 hours to remove moisture. The dried soil and deionized water are mixed in a mass ratio of 1: 5, and the centrifugation method is used for titration test [28] . The chemical composition and content of the soil are shown in Table 2.…”

Section: Experimental Mediummentioning

confidence: 99%

“…For the experimental group with bacteria, take 50 mL of cultivated SRB and 950 mL of simulated soil solution to mix it, and add it to the experimental device. For the sterile control group, 50 mL of deionized water was mixed with 950 mL of simulated soil solution [28] .…”

Section: Experimental Mediummentioning

confidence: 99%

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Study on Corrosion Behavior of X80 Steel under Stripping Coating by Sulfate Reducing Bacteria

Cui

Qin

Gao

2020

Preprint

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Background: At present, microorganism has been considered as important factors that threaten to buried pipelines with disbonded coatings. Aiming at the problem of unknown corrosion mechanism of sulfate-reducing bacteria (SRB), a series of studies have been carried out in this paper. Spectrophotometer and fluorescent labeling technology are used to study the growth and attachment of SRB in the simulated soil solution. The electrochemical behavior of X80 pipeline steel with or without SRB was researched by electrochemical methods such as open circuit potential, dynamic potential polarization curve, and electrochemical impedance spectroscopy. The microscopic morphology of the corrosion products on the surface of the sample was observed with a scanning electron microscope (SEM), and the element content of the corrosion products on the surface of the sample after corrosion was observed using X-ray energy spectrum (EDS) analysis. Results: The results showed that the growth and reproduction of SRB caused the pH of the soil simulated solution to increase, which promoted the corrosion of X80 steel. In addition, the cathode reaction of X80 steel in a sterile environment is the reduction of H+, and the main corrosion product is Fe oxides. When the soil simulation solution contains SRB, the cathodic reaction is controlled by both H+ reduction and sulfide depolarization reactions, and FeS appears in the corrosion products. Conclusion: Although the life cycle of SRB is only about 14 days, the corrosion of X80 steel is greatly promoted by SRB, and even causes corrosion perforation, which will bring huge economic losses and serious safety hazards.

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“…The impedance shifts to higher frequency, which is related to the growth of bacteria [54,55]. The time constant at the high frequency might be due to the formation of composite films containing a combination of corrosion product and biofilm [56].…”

Section: Eis Measurementsmentioning

confidence: 99%

Gemini surfactant as multifunctional corrosion and biocorrosion inhibitors for mild steel

Pakiet

Kowalczyk

Garcı́a

et al. 2019

Bioelectrochemistry

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Biocorrosion is an important type of corrosion which leads to economic losses across oli and gas industries, due to increased monitoring, maintenance, and a reduction in platform availability. Anaerobic sulfate reducing bacteria (SRB) are known to accelerate the rate of corrosion tenfold, by secreting specific enzymes. Mitigation strategies include: (i) cleaning procedures; (ii) addition of microbiocides; (iii) antifouling coatings and (iv) cathodic protection. Ideally, a chemical compound engineered to mitigate against biocorrosion would possess both antimicrobial properties, as well as efficient corrosion inhibition. Gemini surfactants have shown efficacy in both of these properties, however there still remains a lack of electrochemical information regarding biocorrosion inhibition. The inhibition of corrosion and biocorrosion, by cationic gemini surfactants, of carbon steel was investigated. The results showed that the inhibition efficiency of the gemini surfactants was high (consistently > 95 %), even at low concentrations, with the most efficient concentration being above the critical micelle concentration (CMC). Gemini surfactants also showed strong antimicrobial activity, with a minimum inhibitory concentration (0.018 mM). Corrosion inhibition was investigated by electrochemical impedance spectroscopy (EIS) and linear polarisation resistance (LPR), with biocorrosion experiments carried out in an anaerobic environment. Surface morphology was analysed using scanning electron microscopy (SEM).

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Effect of Alternating Current and Sulfate-Reducing Bacteria on Corrosion of X80 Pipeline Steel in Soil-Extract Solution

Cited by 19 publications

References 34 publications

Coupling Effects of pH and Dissolved Oxygen on the Corrosion Behavior and Mechanism of X80 Steel in Acidic Soil Simulated Solution

Coupling Effects of pH and Dissolved Oxygen on the Corrosion Behavior and Mechanism of X80 Steel in Acidic Soil Simulated Solution

Study on Corrosion Behavior of X80 Steel under Stripping Coating by Sulfate Reducing Bacteria

Gemini surfactant as multifunctional corrosion and biocorrosion inhibitors for mild steel

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