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Originally posted by pHaestus
I personally don't have water flowing through the fan shroud on my radiator, but whatever floats your boat.
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I generally don't push water through my fan shroud ether. However unless you live in a dry climate, galvonic corrosion can still be a problem.
Generally properly functioning aircraft don't go into the water but galvonic corrosion is a problem due to the number of dissimilar metals used in there construction. Typically this is the worst type of corrosion because it can only be detected by disassembly and inspection or finding it after a failure (Ref DOT FAA AC65-9A)
This is all you need for galvonic corrosion to occur:
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First there must be two electrochemically dissimilar metals present. Second, there must be an electrically conductive path between the two metals. And third, there must be a conductive path for the metal ions to move from the more anodic metal to the more cathodic metal.
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http://www.engineersedge.com/galvanic_capatability.htm
