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Influence of microbial adherence on corrosion of UNS 1008 carbon steel and hybrid nano-structured coatings

Diaz De Rienzo, MA, Aguirre, M, Martin, P and Galicia, M Influence of microbial adherence on corrosion of UNS 1008 carbon steel and hybrid nano-structured coatings. Anti-Corrosion Methods and Materials. ISSN 0003-5599 (Accepted)

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Abstract

Microbiologically induced corrosion (MIC) causes the degradation of coatings and it can be attributed to either direct or indirect microbial metabolic activity. In this study, we report the ability of sulphate reducing microorganisms (SRM) and marine strain bacteria to attach onto UNS1008 carbon steel, and zinc rich epoxy coatings with a content of carbon nanotubes (CNTs) respectively. In aerobic conditions the outer layer presents a micro-crack appearance and many semisphere products, attributed to spore formation. In anaerobic conditions, evidence of iron sulphide surrounded by a mixture of sulphur-containing extracellular polymer substance was observed by SEM images and EDS analysis. The presence of hybrid coatings (Zn rich epoxy with CNT content) affected the level of microbial adherence and the concentration of corrosion products (Fe2O3, Fe(OH)2, FeS); the cell attachment was lower when the steel surface was coated with Zn/CNTs.

Item Type: Article
Uncontrolled Keywords: 0912 Materials Engineering
Subjects: Q Science > QR Microbiology
T Technology > TA Engineering (General). Civil engineering (General)
Divisions: Pharmacy & Biomolecular Sciences
Publisher: Emerald
Date Deposited: 07 Mar 2018 11:35
Last Modified: 07 Mar 2018 11:35
URI: http://researchonline.ljmu.ac.uk/id/eprint/8215

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