Microbial and Electrochemical Studies of Coated Steel Exposed to Mixed Microbial Communities
Joanne M. Jones, Marianne Walch, Florian B. Mansfeld
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70% confidenceCoated steel exposed to mixed microbial communities showed heavy colonization and breaches in epoxy and nylon coatings, with epoxy coatings being degraded by a non-marine microbial community.
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Abstract
Abstract SEM studies have shown that all surfaces of 4140 steel with epoxy and nylon coatings were heavily colonized with a diverse assemblage of bacteria. Breaches in these coatings after exposure to mixed communities of marine microorganisms were detected using SEM and EDAX analyses. These mixed communities consisted of anaerobic and facultatively anaerobic marine species (sulfate reducers and non-sulfate reducers). Epoxy, but not nylon coatings were degraded by a non-marine mixed, microbial community isolated from water trapped in the cargo area of a navy aircraft. Some epoxy coatings showed visible signs of coating deterioration (i.e., pinpoint holes, blistering and peeling) after a one month exposure to the mixed communities. EIS was used to assess the properties of the exposed, coated 4140 steel in laboratory testing.
Keywords
Identifiers
- Journal
- CORROSION 1991
- Year
- 1991