51313-02336-Why Are Some Microbes Corrosive and Some Not?

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Product Number: 51313-02336-SG

ISBN: 02336 2013 CP

Author: Tingyue Gu

Publication Date: 2013

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So far at least three different types of Microbiologically Influenced Corrosion (MIC) have been identified. Type I involves microbes such as sulfate reducing bacteria (SRB) nitrate/nitrite reducing bacteria and methanogens which are collectively known as XRB where X stands for sulfate nitrate nitrite CO2 or another non-oxygen oxidant. The corrosive microbes respire on these oxidants to oxidize an organic carbon (or sometimes H2) fuel for energy. Biocatalysis is required and the biofilm benefits directly from the energy released by the corrosion process that oxidizes iron instead of an organic carbon. Type II typically involves fermentative microbes such as acid producing bacteria (APB) and the corrosion process itself caused by the secreted corrosive metabolites such as organic acids does not require biocatalysis. Type III involves microbes that secrete extracellular enzymes to depolymerize polymers such as polyurethanes and utilize the monomers and plasticizer molecules as organic carbon and energy sources. This type of MIC is also known as biodegradation. This work is a first of its kind in-depth investigation into the Type I MIC mechanisms. It explains: (a) Why some biofilms are corrosive and some are not (b) Why some corrosive biofilms can be “docile” at times; while some “docile” biofilms can suddenly become aggressive and (c) whether it is possible and practical to employ a “protective biofilm” to prevent MIC.