Microbiologically Influenced Corrosion of 1018 Carbon Steel in Static Seawater/Fuel (Petroleum-Based and Renewable) Mixtures.

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2017-08
Authors
Kealoha, Jan A. N.
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Microbiology
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Microbiologically influenced corrosion of steel was compared to electrochemical corrosion in multiple fuel and seawater combinations. Corrosion rates were higher in Hydro-processed Renewable Diesel (HRD) compared to petroleum-based F-76 (0.035 vs. 0.016 mm/year, respectively) and were higher under aerobic than anaerobic conditions. No significant differences in types of corrosion products, oxygen diffusion, or pH, were observed when comparing natural vs filtered seawater. White carbonates and magnesium hydroxide precipitates were predominantly formed in HRD, whereas red goethite formed in F-76. In the seawater phase, magnetite (black) formed, typically under a layer of orange lepidocrocite. Rust tubercles formed on steel surfaces in the fuel phase of 59% of all samples resulting in corrosion pits on the underlying metal. The HRD and blended fuel contained more rust tubercles, regardless of exposure time. Microbes associated with accelerated corrosion rates were taxonomically assigned on the basis of their partial 16S or ITS1 rRNA gene sequences.
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Microbiologically-Influenced Corrosion (MIC), 1018 carbon steel, Diesel, F-76, HRD, Tubercle
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