Research progress on microbiological inhibition of corrosion: A review

Abstract

Steel structures in marine environments are subjected to severe corrosion over a long period due to the complex and harsh characteristics of their environments. Traditional anti-corrosion methods may lead to environmental pollution and high maintenance costs. Microorganisms exist in large quantities in the environment and can not only accelerate the corrosion of materials but also inhibit corrosion to some extent. Microbially influenced corrosion inhibition (MICI) has become a research hotspot as a new environmentally friendly anti-corrosion measure. In this paper, the effects of microorganisms on the inhibition of metal corrosion are summarized and analyzed, with a review of recent research. We discuss the mechanisms by which microorganisms inhibit corrosion including secretion of corrosion inhibitors, shielding effects of biofilms and corrosion products, changes in the local microenvironment, and alteration of anode and cathode processes; as well as their control mechanisms. Some beneficial microorganisms can inhibit corrosion caused by corrosive microorganisms through mechanisms including biological competition, inhibition of microbial attachment, secretion of antibiotic substances, and phagocytic control. Using microbial anti-corrosion facilitates autonomous regulation, in situ remediation, and intelligent protection, provides lifelong protection and is environmentally friendly. Knowledge of the mechanisms of microbiological inhibition of corrosion can provide references for the protection of metals against corrosion. We have outlined the difficulties and problems in the research and application of microbial antiseptic technology, as well as valuable directions for the future development of microbial antiseptic technology.