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Originally Posted by Kirk
Sure, make me go and look it up... what I'm referring to is galvanic corrosion and it is a very real problem when using two dissimilar metals. I know because I've had trouble with it before completely fusing parts together in an automotive application. Stainless steel and aluminum are especially bad when exposed to a corrosive environment - such as from road salt!
Some people have replaced fasteners in their engine compartment with shinny stainless steel bits thinking they were doing good, only to find out that when used in aluminum they were corroding the aluminum and causing the fasteners to bind. Zinc will help to prevent this corrosion. Guess what's in anti-seize... yup, zinc.
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Galvanic corrosion isn't what you were describing before. It is definitely an issue on the outside of a car. You can put different metals in contact with each other, but they have to be compatible by the anodic index. Here's a pretty good link:
http://www.corrosion-doctors.org/Definitions/galvanic-series.htm
The products that I design have to go through some fairly rigorous environmental testing.