scholarly journals Galvanic Corrosion Due to a Heterogeneous Sulfate Reducing Bacteria Biofilm

Coatings ◽  
2020 ◽  
Vol 10 (11) ◽  
pp. 1116
Author(s):  
Hongwei Liu ◽  
Haixian Liu ◽  
Yuxuan Zhang
Keyword(s):  
Galvanic Corrosion ◽  
Steel Corrosion ◽  
Localized Corrosion ◽  
Cathodic Reaction ◽  
Anodic Reaction ◽  
Sulfate Reducing ◽  
Corrosion Effect ◽  
Desulfotomaculum Nigrificans ◽  
Corrosion Of Steel ◽  
Reducing Bacteria

In this work, the galvanic corrosion behavior of sulfate reducing Desulfotomaculum nigrificans biofilm-covered and uncovered carbon steel was investigated using various electrochemical measurements. The results showed that the bare specimen in the abiotic solution functions as the anode; whereas the biofilm-covered specimen in the SRB-containing solution functions as the cathode after two electrodes being coupled. The anodic reaction of specimen in the biotic solution containing SRB was inhibited; whereas the cathodic reaction was considerably promoted after coupling. Hence, localized corrosion of specimen in the abiotic solution was observed due to the galvanic corrosion effect. SRB could still accelerate steel corrosion even after coupling, but the results indicate that the contribution of SRB to steel corrosion decreased. The localized corrosion of steel in the SRB-containing environments not only involved the SRB biofilm, but also a galvanic corrosion effect. The flow of electrons from the anodic dissolution of Fe in the abiotic solution to the SRB cells of cathodic area decreased the acceptance capacity of electrons by SRB from steel beneath biofilm. As a result, the steel corrosion beneath SRB biofilm decreased after coupling.

scholarly journals Thin Benzotriazole Films for Inhibition of Carbon Steel Corrosion in Neutral Electrolytes

Coatings ◽  
2020 ◽  
Vol 10 (4) ◽  
pp. 362 ◽  
Author(s):  
Maxim Petrunin ◽  
Liudmila Maksaeva ◽  
Natalia Gladkikh ◽  
Yuriy Makarychev ◽  
Marina Maleeva ◽  
...  
Keyword(s):  
Carbon Steel ◽  
Photoelectron Spectroscopy ◽  
Steel Surface ◽  
Steel Corrosion ◽  
Chloride Ions ◽  
Localized Corrosion ◽  
Polymeric Coatings ◽  
Carbon Steel Surface ◽  
Corrosion Of Steel ◽  
Anticorrosion Properties

This article investigates the modification of a carbon steel surface by benzotriazole (BTA), and the structure and properties of the formed layers. Adsorption was studied by surface analytical methods such as X-ray photoelectron spectroscopy (XPS) and reflecting infrared microscopy (FTIR). It has been established that a polymer-like film containing iron-azole complexes that are 2 nm thick and strongly bonded to the metal is formed on the surface as a result of the azole interacting with a steel surface. This film is capable to inhibit uniform and localized corrosion of steel in neutral aqueous electrolytes containing chloride ions. It is shown that the iron-azole layer located at the interface acts as a promotor of adhesion, increasing the interaction of polymeric coatings with the steel surface. Taking into account these properties, the steel pretreatments can be used for improving the anticorrosion properties of polymeric coatings applied for the protection of steel constructions.

scholarly journals Investigation of the effect of hydrocinnamic (3-phenylpropanoic) acid on the microbiological corrosion of steel

2020 ◽  
Author(s):  
А.А. Грибанькова ◽  
М.А. Агиевич ◽  
О.А. Евтуховская ◽  
В.В. Гурченко ◽  
С. Чжай ◽  
...  
Keyword(s):  
Electrochemical Impedance ◽  
Ph Value ◽  
Inhibitory Effect ◽  
Bacterial Cells ◽  
Microbiological Corrosion ◽  
Sulfate Reducing ◽  
Corrosion Of Steel ◽  
Reducing Bacteria ◽  
Number Of Bacteria ◽  
Selection Of

В основе работы лежит исследование воздействия органического соединения (ОС) – гидрокоричной (3-фенилпропановой) кислоты на бактериальные клетки СРБ (сульфатредуцирующих бактерий) являющиеся стимуляторами коррозионных процессов. Подбор условий использования и количественная оценка эффективности ингибирующего (биоцидного) действия исследуемого ОС, которое может быть применено для защиты стали от коррозии в средах, содержащих сульфатредуцирующие бактерии. В ходе исследования было изучено влияние ОС на развитие сульфатредуцирующих бактерий и определены такие параметры, как изменение значения pH и окислительно-восстановительного потенциала образцов в среде, численности бактерий и содержания биогенного сероводорода в зависимости от концентрации используемого ОС. Сделаны основные выводы о ингибирующем коррозию и биоцидном действиях испытуемого органического соединения путем оценки скорости коррозии образцов стали и защитном эффекте в зависимости от выбранных концентраций органического соединения методом гравиметрии. Дополнительная оценка ингибирующего действия была проведена методом электрохимической импедансной спектроскопии и методом снятия поляризационных кривых испытуемых образцов. The study is based on the study of the effect of an organic compound (OC) – hydrocinnamic (3-phenylpropanoic) acid on the bacterial cells of SRB (sulfate-reducing bacteria), which are stimulants of corrosion processes. Selection of conditions of use and a quantitative assessment of the effectiveness of the inhibitory (biocidal) action of the studied OC, which can be used to protect steel from corrosion in environments containing SRB. In the course of the study, the effect of OC on the development of SRB was studied and such parameters as the change in the pH value and the redox potential of the samples in the medium, the number of bacteria and the content of biogenic hydrogen sulfide depending on the concentration of the used OC were determined. The main conclusions are drawn about the inhibitory corrosion and biocidal actions of the test OC by assessing the corrosion rate of steel samples and the protective effect depending on the selected concentrations of the OC by gravimetry. An additional assessment of the inhibitory effect was carried out by the method of electrochemical impedance spectroscopy and by the method of taking the polarization curves of the test samples.

scholarly journals Influence of soil microorganisms on metal corrosion of underground pipelines

2018 ◽  
Vol 62 (2) ◽  
pp. 65-70 ◽  
Author(s):  
M. Polutrenko ◽  
P. Maruschak ◽  
A. Tymoshenko ◽  
A. Sorochak
Keyword(s):  
Oil And Gas ◽  
Surface Film ◽  
Corrosion Damage ◽  
Metal Corrosion ◽  
Localized Corrosion ◽  
Sulfate Reducing ◽  
Surface Analysis Techniques ◽  
Steel 17G1s ◽  
Anaerobic Corrosion ◽  
Reducing Bacteria

Abstract There have been revealed and summarized the regularities in biocorrosion of steel 17G1S-U, which is traditionally used for manufacturing oil and gas mains. The basic regularities of biocorrosion processes in the 17G1S-U pipe steel under the influence of SRB Desulfovibrio Sp. strains Kyiv-10 was obtained by weight-loss testing and surface analysis techniques. Effective inhibitors are proposed, which allow protecting steel 17G1S-U against the development of anaerobic corrosion under the influence of sulfate-reducing bacteria (SRB). The effectiveness of inhibitors is estimated by the degree of their protective effect. The porous structure of the surface film contributes to the initiation of localized corrosion. Damage analysis of the specimen surface corroded under different test conditions was performed.

Influence of Sulfate Reducing Bacteria on Corrosion of Steel Q235 during Natural Evaporation in Soils

2012 ◽  
Vol 610-613 ◽  
pp. 243-248
Author(s):  
Xin Wang ◽  
Jin Xu ◽  
Cheng Sun
Keyword(s):  
Electrochemical Impedance Spectroscopy ◽  
Electron Probe ◽  
Electrochemical Impedance ◽  
Sulfate Reducing Bacteria ◽  
Microbiological Analysis ◽  
X Ray ◽  
Sulfate Reducing ◽  
Corrosion Rates ◽  
Corrosion Of Steel ◽  
Reducing Bacteria

Corrosion behavior of steel Q235 was investigated during natural evaporation in soils with and without sulfate reducing bacteria (SRB) by microbiological analysis, electrochemical impedance spectroscopy (EIS), energy dispersive X-ray analysis (EDXA) and electron-probe X-ray microanalysis (EPMA). The results show that during natural evaporation, oxygen content increases, amounts of SRB decrease, and the corrosion rates of steel Q235 increase with decreasing humidity of soils with and without SRB. Increments of the corrosion rates are much bigger in soils with SRB than those without SRB.

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