It is the localized attack (Stings) producing penetration stainless steel. Pitting is associated with the local discontinuity passivation film, may be due to extreme corrosive agents or mechanical imperfections, Foreign particles such as, damage to the surface of the material, failures or chromium oxide film. The phenomenon occurs when the passive film is broken and there is a very localized attack. May prevent or slow this effect using stainless steels containing molybdenum.
Pitting
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