Pitting corrosion most often takes place at points where the passive layer might be weakened, for example by slag inclusions, a damaged surface or imperfections in the passive layer.
Pittings may take the shape of small holes, 1-2 mm in depth and diameter to begin with. At times they are almost hidden below the surface of the steel with an "entrance hole" of only a few tenths of a mm. with a cavity of 1-2 mm below. They are therefore sometimes very difficult to detect, but might cause severe damage if left unattended.
Pitting may develop in a generally corrosive surrounding, especially when the surface is disturbed or when some extra chemical aggressive agent is present such as:
STAINLESS STEEL SURFACE BUFFING - GRINDING - POLISHING - WELDING
CLEANING OPERATIONS - PICKLING AND PASSIVATION
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