Effect of multi-factor coupling on microbiologically induced corrosion of oil/gas pipeline steel: A review of mitigation strategies and challenges

Le résumé fourni par la source

From subsea to under-ground pipeline steel, microbiologically induced corrosion (MIC) poses significant threats, undermining material integrity and engineering efforts aimed at curbing the menace. Although many sophisticated alloys have been developed to resist MIC, research shows that the finished steel pipes are still prone to degradation on the long run as corrosive species still evade recalcitrant surface films to facilitate corrosion. Furthermore, certain environmental, structural, and operational conditions have been found to couple with microbial activities to worsen MIC steel pipes. This review is uniquely aimed at unraveling the interplay between these factors and microbial activities, highlighting how they undermine MIC mitigation strategies in steel pipes. Among such factors are dynamic environmental chemistries, coating/insulation disbondment and failure, and scale/deposit accumulation in steel pipes, and so on. Whereas degradable carbon sources from agricultural and industrial activities provide alternate nutrients boosting microbial cell metabolism and proliferation, local environments under failed coatings and sediments form galvanic micro-cells, thus exacerbating MIC in steel pipes. Furthermore, the synergistic effects between hydrogen permeation, cathodic overprotection, and stray AC current on MIC of steel pipes are also discussed. Finally, future outlook on research direction and engineering priorities for industry adoption in MIC management is proposed.

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