Passivation of stainless steel due to the formation of the film of the oxide Cr2 O3. In the absence of oxygen (or the substitution of other ions), piscivorous film on the surface of stainless steel is formed. In the worst case of small local punctuation will disrupt the oxide layer in a number of critical points. Corrosion at these points forms the corrosion of gaps of several types, dependent on conditions. Corrosion gap may continue to grow even when there is no aggressive factor, since the inside of the cavities there is no oxygen. The sharp ends of long and narrow gaps can form stress concentration and cause fracture of elastic alloys in thin films appear pin holes, the depth of which depressions in the thickness of a finger.
It can lead to a gradual and imperceptible destruction of the entire construction. Such corrosion shall be suspended if the material to provide oxygen, eliminate gaps and a touch of salt. Pitting corrosion is typical for exposure of a solution of concentrated salts, e.g., sea water at an elevated temperature.
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