How does corrosion occur at the least oxygenated areas?

[Arceus74]

TL;DR Summary

I cannot conceptualize on how corrosion does not occur in more oxygenated areas. Consider a nail partially immersed underground. Why does the rust form where the iron which is exposed to the least oxygen and not the other way around?

Kindly explain. Thanks in advance.

Thanks

 

[trurle]

Summary:: I cannot conceptualize on how corrosion does not occur in more oxygenated areas. Consider a nail partially immersed underground. Why does the rust form where the iron which is exposed to the least oxygen and not the other way around?

Kindly explain. Thanks in advance.

Thanks

The rusting reaction in case of nail and ground do include groundwater in addition to oxygen.
4Fe+2H2O+3O2->4FeO(OH)
For noticeable corrosion of iron by dry oxygen, temperature of about 300C is required.

 

[Arceus74]

The rusting reaction in case of nail and ground do include groundwater in addition to oxygen.
4Fe+2H2O+3O2->4FeO(OH)
For noticeable corrosion of iron by dry oxygen, temperature of about 300C is required.

Hello,

Thanks for your insights.