What is the Microbiologically Influenced Corrosion (alias MIC)? It is a type of corrosion that affects the metals that is caused by the action of different microorganisms. These intervene, directly or indirectly, in the initiation or in the evolution of this phenomenon (through substances produced by its metabolism).
The case of stainless steel.
The Microbiologically Influenced Corrosion that occurs in stainless steels is considered localized. But what are its characteristics?
- Morphological characteristics:
– chlorine pitting (local depassivation of the protective film)
– crevice corrosion
- The presence of chlorinated deposits easily deformed
- Fast penetration.
How to identify the presence of MIC?
To confirm the presence of MIC you should verify the considerable presence of a microbiological aggressive species. Having carried out to rule out other possible mechanisms of corrosion.
But how does it occur locally the MIC? With:
- Large cavity beneath the surface (near welded areas)
- Large open cavity in cracks (joints)
How to prevent Microbiological Influenced Corrosion?
But how can we prevent such corrosion? Flushing and drying immediately the material of stainless steel after a hydraulic test. Or after a burnishing procedure.
Unfortunately, this kind of procedures are not explained on the manufacturing codes and standards in any way.
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