[NewCandle] Aluminum-iron battery

[Horace Heffner]

Given the accumulating iron on the aluminum surface, an explanation  
of the corrosion might be that an iron-aluminum battery forms.  The  
current increases as the aluminum erodes and the iron accumulates on  
the surface and in solution.  The current is made stronger at all  
points by making the gap between foil surfaces smaller, by thus  
reducing cell resistance.

Best regards,

Horace Heffner
http://www.mtaonline.net/~hheffner/