Pitting corrosion occurs due to formation of……… at the metal surface.
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The main cause of pitting phenomena is the formation of a stable corrosion cell, usually on the surface of a passive metal, as a result of a breakdown or perforation of the protective oxide layer. In this cell, the passive area plays the role of a cathode when the metal bottom in the pit actively dissolves as an anode.
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it occurs because of electrochemical reaction between metal and atmoshere
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