Stainless steel is greater resistance to corrosion in different aggressive environments. For this they are developed and have proved to be affected, however, by various processes and types of corrosion.

Mainly pitting is activated and developed in the presence of microorganisms. These microorganisms are acting in an isolated or symbiotic way, according to their adaptation to the environment, and they create a favorable situation for the corrosion of these steel.

Bacteria, one kind of these microorganisms, which are two types

• Aerobic, and
• Anaerobic

Bacteria of both the aerobic and anaerobic type, modify the environment where the stainless steel is found. They creat crevices, differential aeration zones or a more aggressive environment with the presence of metabolites. In these circumstances, a local break of the passive and passivating layer is produced, which is proper to these types of steel and impedes the repassivation that is more favorable to corrosion.

Microbiologically influenced corrosion are found electrochemical techniques, since corrosion is fundamentally an electrochemical process. and These techniques for the identification, culture, and evaluation of the microorganisms involved in the process, as well as in the laboratory or field study of microorganism-metal pairs.

It is known that the microstructure of steel can substantially modify their behavior when faced with corrosion. From surface analysis studies, it is known that corrosion is a process that is generated on and progresses from the surface. Biocides must be included in this microbiologically influenced corrosion. They are not always usable or successful, for the design of industrial equipment or components that do not favor the adherence of microorganisms, using microstructures in steel less sensitive to corrosion, or protecting the materials. In these ways, the design of industrial equipment or components that do not favor the adherence of microorganisms, using microstructures in steel less sensitive to corrosion, or protecting the materials.