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Originally Posted by Butcher
Rad and block are sufficiently connected via the water to corrode - people have seen this many times (usually with a copper rad and Al blocks). It'll be real hard to find out how much the rad is corroding without tearing it apart though.
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The parts must be in electrical contact aside from the water (which is the ionic conductor), or else there is no complete path for current to flow. In many cases it may simply be the connection through the case chassis, which the block and radiator are both bolted to. In the case of the block and lid, the aluminum and copper could easily be in physical contact, and there is obviously water touching both of them, creating a very short (low resistance) path for ionic conduction.