Materials Performance

OCT 2018

Materials Performance is the world's most widely circulated magazine dedicated to corrosion prevention and control. MP provides information about the latest corrosion control technologies and practical applications for every industry and environment.

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OCTOBER 2018 MATERIALSPERFORMANCE: VOL. 57, NO. 10 39 that the percent GDP cost of corrosion is not dropping…this can only mean that society is not learning, or society is willing to make errors in judgment. Assuming it is not the latter, there is an increasing and even more significant role for NACE International in the future of corrosion control. RICH A RD B. ECK ER T Microbiologically influenced corrosion (MIC) impacts many different assets and indus- tries, and yet it is a corrosion process that is still not com- pletely understood—despite the current advances being made in the field of genomics. MIC is typically found to be associated with diverse func- tional types and genera of microorganisms that develop into biofilms, forming syn- trophic or complementary metabolic relationships that enhance microbial growth and activity. The spatial and meta- bolic relationships between the different members of the biofilm community and the electrochemical process of corrosion are still being investigated. Application of molecular microbiologi- cal methods (MMM) in the oil and gas industry has led to a greater under- standing of the diversity of bacteria and archaea (and fungi) that exist in production and storage wells, piping, process plants, and tanks; however, characterizing a multitude of different microorganisms has not always been helpful to asset operators who simply want to know how to mitigate MIC. Industry wants a straightforward diagnostic test for MIC that provides actionable results. Genomic methods fall into different "omics" scientific disciplines, including: ➽ Metagenomics—the study of genetic material (DNA) from entire microbiological communities in a given environment to understand diversity and function ➽ Proteomics—the study of proteins as a measure of gene expression and cellular activities and functions ➽ Metabolomics—the comprehensive study of chemical metabolites produced by microbiological communities to help characterize their activities Each of these "omics" produces information that needs to be translated and integrated with other information about the chemical environment and physical conditions in which the collective of microorganisms live, to under- stand who is there and what they are doing, particularly in relation to corro- sion. Since to date there has been no singular data element found that is diagnostic for MIC, a successful future test method would likely need to inte- grate numerous chemical and microbiological factors using a model and some form of machine learning, based on a large and reliable data set. From such a future model and data set, relationships between the microbiology, chemistry, materials science, and physical conditions of a given environment could be determined and the propensity for MIC positively identified. Probabilistic modeling tools may be one way to start predicting MIC based on the information available today; in the future, these predictions would then be improved upon as machine learning approaches are devel- oped and incorporated into the model. Thus, future technology for MIC diag- nosis would have most of the necessary data built into the tool (model) so that the parameters that needed to be obtained through sampling and analy- sis would be few, and the technology used to perform any analysis would be contained within one device. With accurate and reliable MIC diagnosis, pre- vention and mitigation measures could be more effectively applied, resulting in improved asset integrity, longevity, and sustainability. F RED G O ODW IN I work with concrete so most of my comments apply to the corrosion of reinforcing steel in concrete. Concrete is claimed to be the sec- ond most common man-made material (after potable water), with about 1 cubic yard produced for every

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