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Open AccessArticle

Galvanic Corrosion Due to a Heterogeneous Sulfate Reducing Bacteria Biofilm

by 1,2,*, 1,2 and 1,2
1
School of Chemical Engineering and Technology, Sun Yat-sen University, Zhu Hai 519082, China
2
Southern Marine Science and Engineering Guangdong Laboratory (Zhuhai), Sun Yat-sen University, Zhu Hai 519082, China
*
Author to whom correspondence should be addressed.
Coatings 2020, 10(11), 1116; https://doi.org/10.3390/coatings10111116
Received: 30 October 2020 / Revised: 16 November 2020 / Accepted: 17 November 2020 / Published: 20 November 2020
(This article belongs to the Section Corrosion, Wear and Erosion)
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. View Full-Text
Keywords: microbiologically influenced corrosion; galvanic corrosion; sulfate-reducing bacteria; biofilm microbiologically influenced corrosion; galvanic corrosion; sulfate-reducing bacteria; biofilm
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MDPI and ACS Style

Liu, H.; Liu, H.; Zhang, Y. Galvanic Corrosion Due to a Heterogeneous Sulfate Reducing Bacteria Biofilm. Coatings 2020, 10, 1116.

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