Quote:
Originally Posted by RETed
That's typical.
It's actually aluminum oxide.
It's galvanic corrosion due to having two dissimilar metals (steel side irons + aluminum rotor housings) and an electrolyte (coolant) - that's basically a battery.
-Ted
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Gah, of course! In my search to find
something I've managed to forget even the most basic material science. So what exactly should I be looking for given the circumstances? I have a couple other pictures of the rear iron and rotor housing but nothing looks out of the ordinary (to me).