I was readind this post and Wayne have in fact excelent information. Congratulations, one more time.

The name for this kind of corrosion is Galvanic Corrosin. Also very important is corrosion under stress. Look under "Galvanic Corrosion Tables". There are very nice ones. I had a problem with corrosion of magnesium speakers (maybe is better to get nuts and bolts of similar material or then use nylon spacers).

*nice read: Fastener Design Manual - http://www.tcnj.edu/~rgraham/barrett/manual1-A.html

PICTURE FROM: http://ops.dot.gov/regs/small_ng/images/chapter3_table.png

• Galvanic Corrosion [2. GALVANIC (Two metal).]