Inorganic compound metabolism and electrochemical reactions of metal-corroding microorganisms

Abstract

Metal materials are not naturally occurring substances but are artificially manufactured and extensively used across nearly all aspects of human activity in modern society. While the corrosion of metals can generally be predicted based on physicochemical factors, the involvement of microorganisms can significantly accelerate corrosion processes, which is known as microbiologically influenced corrosion (MIC). Such microbiological effects can disrupt conventional lifespan predictions for metal materials. Historically, MIC research has centered on models involving hydrogenotrophic sulfate-reducing bacteria and their role in iron corrosion. However, recent studies have revealed that a wide range of microorganisms may contribute to metal corrosion in various ways. In this presentation, I will provide an overview of the latest knowledge in MIC research and share examples from our own work. These include investigations into microbial community dynamics during metal corrosion in freshwater environments, as well as the role of electrochemically active microbial metabolism in stainless steel corrosion under deep-sea conditions. This research is expected to contribute to a broader understanding of biogeochemical processes in diverse modern environments.