Why less originated area act as anode in a metal ?

[ajayguhan]

Why less originated area act as anode in a metal ?

 

[Borek]

What do you mean by "originated area"?

 

[ajayguhan]

Sorry it's oxygenated

 

[Borek]

I am still not sure what the question is really about. In what context was it asked?

 

[ajayguhan]

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