Guess we will have to agree to disagree as I have seen galvanic corrosion between two grades of stainless. I am going to go with the experts (and nature) on this one. No circuit...no galvanic corrosion. The more noble a metal is the less likely it is to be the anode (the metal that dissolves/corrodes rapidly). Stainless can STILL be the anode if the other metal is even more noble. The water does NOT make it a circuit...
I will again point to this link:
http://www.corrosionist.com/Galvanic_Corrosion.htm
Under the three conditions needed for galvanic corrosion number 2 is:
Condition 2. The metals must be in electrical contact
The two different metals must be in electrical contact with each other. This is of course very common. The two metals can be bolted, welded or clamped together, or even just resting against each other.
Under the how to avoid galvanic corrosion section near the bottom of the page it says:
Prevent Electrical Contact.
It is often practical to prevent electrical contact between the dissimilar metals (removal of Condition 2). This may be achieved by the use of nonconducting (eg rubber or plastic) spacers, spool pieces or gaskets, perhaps in conjunction with sleeves around bolts. For the same reason a gap may be left between galvanised roofing and a stainless steel down-pipe.
Again. Not to get this going into a big argument as the only thing I would fight for is your right to disagree, but without a circuit there can be no flow...and the spice MUST flow =)
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