Why less originated area act as anode in a metal ?

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ajayguhan
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Why less originated area act as anode in a metal ?
 
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I am still not sure what the question is really about. In what context was it asked?
 
A metal undergoes a electrochemical corrosion when exposed to moisture air. The parts which are less exposed to oxygen will act as anode and the more oxygen concentrated area will act as cathode
 

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