Fig. 8: Proposed reaction mechanisms for abiotic and biotic conditions.

Overview of key reactions and diversity of microorganisms within a biofilm involved in metal corrosion. It is important to note that the reactions illustrated may occur simultaneously. Numbers 1–6 refer to abiotic reactions associated with corrosion. Biotic reactions involved in the corrosion of ferrous metals are also shown for electroactive corrosive bacteria, electroactive bacteria, and fermentative electroactive bacteria. BioRender.com (2023). Proposed reaction mechanisms for abiotic and biotic conditions.