What is a necessary condition for microbiologically influenced corrosion (MIC) to exist?

Microbiologically influenced corrosion (MIC) occurs when microorganisms, such as bacteria, interact with metal surfaces and contribute to the corrosion process. A critical condition for MIC to take place is the presence of a metal surface that can serve as a host for these bacteria. This metal surface allows biofilms to form, providing a conducive environment for the microorganisms to grow and proliferate. Once established, these bacteria can produce corrosive byproducts or create localized areas of different electrochemical potentials on the metal surface, ultimately leading to accelerated corrosion.

While factors like water, nutrients, oxygen levels, and temperature can influence the overall rates and types of corrosion, the requirement for a metal surface is fundamental because, without it, there is no substrate for the bacteria to colonize and initiate their damaging activities.