Guidelines For Diagnosing Mic

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Information about Guidelines For Diagnosing Mic

Published on April 27, 2012

Author: rick_eckert

Source: slideshare.net

Description

General guidelines for the investigation and diagnosis of microbiologically influenced corrosion (MIC) are proposed in this white paper. Feedback is welcome.

Guidelines for Diagnosing MICSince microorganisms can be found in nearly every environment on the planet, clearlydetermining their relevance to the corrosion of engineered components and structures isnot always straightforward.Based on the current published understanding of microbiologically influenced corrosion(MIC), demonstration of the following five elements is proposed for consideration in anydiagnosis or investigation of MIC. 1. A spatial relationship between microorganisms and the corrosion damage should be demonstrated. The form of microbial contribution to corrosion depends on which organisms are present, where they are located and when they were present. 2. Corrosion products should be consistent with reactions resulting from microbial activities. The composition, structure and location of corrosion related deposits should support the explanation of microbial involvement in the corrosion mechanism. 3. Microorganisms should be shown to contribute to the electrochemical reactions. a. The extent of microbial involvement in cathodic/anodic reactions must be explainable based on metabolism of the organism and local environmental conditions. b. Microorganisms may directly or indirectly contribute to electrochemical reactions. For example SRB may utilize hydrogen at the cathode (direct) or aerobic bacteria may form sticky polymers that attract inorganic solids and form crevices (indirect). 4. Microorganisms that support the corrosion mechanism in the specific local environment should be identified. a. Taxonomic groups or species should be present at locations in the corrosion cell as described in the proposed corrosion mechanism. b. Generally, the numbers of microorganisms specifically contributing to corrosion should be higher where they support the corrosion mechanism than in unaffected surface environments. c. Biofilms may support a symbiotic consortium of microorganisms, and this biological interdependency may be required to support corrosion. 5. The local environment should be shown to support the microorganisms. a. Environmental conditions such as pH, salinity, temperature, oxygen, velocity, and electron acceptors and donors used for metabolism should be appropriate for growth of the organisms involved. b. The local environment may be a micro-niche, thus highly localized conditions (e.g. under deposits) should be considered.Richard Eckert – Principal Engineer, Internal Corrosion ManagementDet Norske Veritas (U.S.A.), Inc.Rick.Eckert@dnv.com

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