Thermal Spray Coatings for Protection Against Microbiologically Induced Corrosion: Recent Advances and Future Perspectives

Abstract

Corrosion has been persisting as the most severe concern for steel structures in the marine environment. Due to the widespread occurrence of biofouling, apart from the electrochemical corrosion, microbiologically induced corrosion (MIC) is an important factor that triggers the deterioration of marine steel infrastructures. Traditional anti-corrosion coatings usually lack the antifouling function, attachment and colonization of marine microorganisms therefore in most cases accelerate the existing corrosion damage. Anti-corrosive coating fabricated by thermal spray has been extensively applied for the marine corrosion prevention, yet the anti-MIC coatings deposited by thermal spray technical route still keep elusive. Developing thermal-sprayed coatings with dual anti-corrosion and antifouling performances is the key to combating MIC. In this review, most recent advances in understanding biofouling and developing antifouling and anti-MIC techniques are surveyed. The formation and evolution of MIC and biofouling, and the effect of microbial biofilm on their occurrence are addressed briefly. Strategies involving the use of chemical methods, physical methods and biological methods to prevent MIC and biofouling are discussed. Selection and design of thermal spray coating materials with desired corrosion resistance and antifouling performances are reviewed. Current perspectives and future possibilities of thermal-sprayed marine coatings for long-term anti-MIC applications are also discussed.