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

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Title:Microbiologically Influenced Corrosion of 1018 Carbon Steel in Static Seawater/Fuel (Petroleum-Based and Renewable) Mixtures.
Authors:Kealoha, Jan A. N.
Contributors:Microbiology (department)
Keywords:Microbiologically-Influenced Corrosion (MIC)
1018 carbon steel
Diesel
F-76
HRD
show 1 moreTubercle
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Date Issued:Aug 2017
Publisher:University of Hawaiʻi at Mānoa
Abstract: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.
Description:M.S. Thesis. University of Hawaiʻi at Mānoa 2017.
URI:http://hdl.handle.net/10125/62545
Rights:All UHM dissertations and theses are protected by copyright. They may be viewed from this source for any purpose, but reproduction or distribution in any format is prohibited without written permission from the copyright owner.
Appears in Collections: M.S. - Microbiology


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