ESEM/EDS, SEM/EDS and EIS Studies of Coated 4140 Steel Exposed to Marine, MixedMicrobial Communities Including Sulfate-Reducing Bacteria (SRB). (Reannouncement with New Availability Information)

摘要

EDS analyses detected breaching of epoxy, nylon, and polyurethane coatingsapplied to 4140 steel when coupons were exposed to mixed communities of marine microorganisms. SEM and ESEM studies have shown that all coated surfaces of 4140 steel were heavily colonized with a diverse assemblage of bacteria. These mixed communities consisted of anaerobic and facultatively anaerobic marine species (sulfate reducers and non-sulfate reducers). Epoxy, but not 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. ESEM offered a non-destructive method for observing the relationship of biofilms to corrosive attack of the coatings. EIS was used to assess the properties of the exposed, coated 4140 steel in laboratory testing.... Biofouling, Corrosion, Biodeterioration, Electrochemistry.