A SUCCINCT OVERVIEW OF PROTECTIVE COATING MATERIALS AND STRATEGIES FOR CONCRETE SEWER AGAINST BIOGENIC CORROSION
DOI:
https://doi.org/10.55766/sujst11197Keywords:
Concrete Sewer, Environmental Risk, Microbiologically Induced Corrosion, Protective Coatings, Sewage PollutionAbstract
Concrete sewer systems are prone to microbiologically induced corrosion (MIC). This process starts when hydrogen sulfide is converted into sulfuric acid by microbial activity, lowering the surface pH and speeding up the breakdown of Portland cement. Because of this, durable protective coatings have become increasingly important. This review summarizes recent developments in coating materials that can resist MIC, including polymer-based films, cementitious barriers, magnesium hydroxide layers, geopolymers, super hydrophobic treatments, antimicrobial options, and new hybrid or self-healing systems. Studies show that magnesium hydroxide coatings can keep the surface pH above 9.5 for nearly 90 days in 3% H2SO4, indicating strong neutralizing ability. Epoxy coatings generally show low mass reduction during accelerated acid testing, while geopolymer and super hydrophobic coatings help reduce gypsum formation and improve acid resistance. Hybrid Zn-PU coatings also improve durability through self-repairing features and multiple bonding interactions. Although the progress is promising, gaps still remain, particularly the limited availability of long-term field data and the absence of standardized test methods specific to MIC. Future research should focus on improved laboratory models of biocorrosion, practical criteria for selecting suitable coatings, and trenchless rehabilitation design. Better coatings and testing approaches are essential for durable wastewater systems.
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