Study on corrosion behavior of X80 steel under stripping coating by sulfate reducing bacteria

Abstract

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 corrosion 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 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 may promote 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 iron oxide. 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.

Potential of sodium dichromate and sodium silicate to control in vitro growth of Bacillus cereus, a metal corrosion-causing bacterium

“…Some corrosion-causing bacteria, such as those that reduce sulphate (Dong et al 2021), sulphur bacteria, iron bacteria, thiosulphate bacteria, hydrogen bacteria, and nitrogen bacteria, have been extensively reported. The sulfate-reducing bacteria could increase its surrounding environmental pH which leads corrosion to occur (Cui et al 2021). These scientists further reported that corrosions promoted by sulphate-reducing bacteria are 3.5 folds higher than those caused by natural metal oxidation.…”

The Isolation of Anaerobic and Facultative Anaerobic Sulfate-Reducing Bacteria (SRB) and a Comparison of Related Enzymes in Their Sulfate Reduction Pathways

“…Compared with anaerobic SRB, facultative anaerobic SRB grow and reproduce more rapidly and are more robust and easier to apply in industrial production settings, such as during biological desulfurization and wastewater treatment [ 18 ]. However, at present, studies on the diversity of SRB have mainly focused on the diversity of SRB taxa in different habitats [ 19 , 20 , 21 ] and the effects of environmental factors on the abundance and communities of SRB [ 22 ], while studies on the understanding of the groups and corrosion mechanisms of facultative anaerobic SRB are insufficient [ 23 ].…”

Nanocomposites based on biocompatible polymers and graphene oxide for antibacterial coatings

“…The colonization of bacteria on surfaces can give an adverse impact on the function of instruments such as petroleum pipelines, aquatic systems, textiles, food packages, contact lenses, and medical devices. 1–3 These negative impacts include the worsening of surface functions and properties 4 ; surface corrosion 5 ; bacterial contaminations 6,7 ; biofouling 8 ; chronic infection 7 ; and even deaths. 9 Food packaging without antibacterial coatings may cause quality deterioration and spoilage of foods.…”