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96198 Case Histories of External Microbiologically Influenced Corrosion Underneath Disbonded Coatings

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Product Number: 51300-96198-SG
ISBN: 96198 1996 CP
Author: Joseph L. Pikas
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External microbiological influenced corrosion (MIC) underneath disbonded pipeline coating systems is a serious dilemma in the industry. In the past and even today, it has not been recognized as such because it has been primarily mistaken for galvanic corrosion. Due to the type of coating materials used in the past, the cleaning process or lack of it, and application methods used, all coating systems have the propensity to develop defects and pinholes where disbandment and this type of microbial corrosion could occur. In addition, the pipeline may or may not have had cathodic protection initially and/or consistently applied. Given these factors and the interaction of bacteria from the soil, moisture availability, and temperature of the pipeline, this paper will discuss the role that microbes play in the disbandment process, thus resulting in corrosion of an underground pipeline. Several case histories, laboratory results, and field findings will be presented. Keywords: microbiological influenced corrosion, galvanic corrosion, disbandment, coating materials
External microbiological influenced corrosion (MIC) underneath disbonded pipeline coating systems is a serious dilemma in the industry. In the past and even today, it has not been recognized as such because it has been primarily mistaken for galvanic corrosion. Due to the type of coating materials used in the past, the cleaning process or lack of it, and application methods used, all coating systems have the propensity to develop defects and pinholes where disbandment and this type of microbial corrosion could occur. In addition, the pipeline may or may not have had cathodic protection initially and/or consistently applied. Given these factors and the interaction of bacteria from the soil, moisture availability, and temperature of the pipeline, this paper will discuss the role that microbes play in the disbandment process, thus resulting in corrosion of an underground pipeline. Several case histories, laboratory results, and field findings will be presented. Keywords: microbiological influenced corrosion, galvanic corrosion, disbandment, coating materials
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The transport of dissolved O2, and that of dissolved carbon dioxide (CO2) if present, into the disbonded region through holiday can be key to determining the disbonded corrosion rate. The evolution of chemistry in the disbonded region and the transient behavior of corrosion potential and rate in the disbonded region are investigated and reported in this work.
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98611 Corrosion Mitigation Under Disbonded Coating

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