| Chronology | Current Month | Current Thread | Current Date |
| [Year List] [Month List (current year)] | [Date Index] [Thread Index] | [Thread Prev] [Thread Next] | [Date Prev] [Date Next] |
Further, it can be shown that oxidation of iron takes place
preferentially at sites where the iron has been stressed. This can be as
simple as a bend in an iron nail.
Isn't that confounded by crazing of the surface? I don't think I would be
at all convinced that stress alone accounts for the difference, but I
don't know what the actual process is. Still, it seems to me that fresh
surface is exposed when one bends a nail, surface that is not protected
by as much oxide as has formed on the rest of the nail. Perhaps you could
demonstrate it on a seasoned bent nail?
Don't charges concentrate on the region of maximum curvature? I think
it's one of Faraday's laws. As the redox takes place, the mobile charge
in the conductor tends to concentrate at the region of greatest bend and
effectively increases the concentration of the reactant at that point.
This increase results in an increase in rate of oxidation leaving the
rest of the nail to be reduced.