Review in microbiologically induced corrosion inhibition mechanisms and metal protection strategies

Microorganisms exert dual regulatory effects of accelerating and inhibiting corrosion of metallic materials. As an innovative eco-friendly anti-corrosion technology, microbially induced corrosion inhibition (MICI) possesses prominent application potential in material corrosion control owing to the merits of microbial proliferative capacity, genetic editability and environmental responsiveness. Based on literature investigation, this paper systematically reviews the research progress of MICI mechanisms and relevant anti-corrosion strategies. Six core corrosion inhibition mechanisms are summarized, including metal interfacial microenvironment regulation, biological competition and microbial community modulation, protective effect of biofilm extracellular polymeric substances, biomineralized layer protection, synthesis of novel long-acting multifunctional corrosion inhibitors, and regulation of extracellular electron electrochemical balance. Their action pathways and feasibility for mitigating microbial-induced corrosion are analyzed. Furthermore, the application performance of various anti-corrosion technologies derived from the above mechanisms is elaborated. The supporting role of mechanism research in technological innovation and their intrinsic correlation are clarified. Existing deficiencies in mechanism cognition, protective techniques and engineering application are also pointed out. Finally, future research prospects are proposed in accordance with current research status and technological development demands, aiming to provide theoretical reference and practical guidance for long-term prevention and control of microbial corrosion.