Badger (Jul 21, 2001 04:55 a.m.):
Richard999 (Jul 21, 2001 02:27 a.m.):
Edit... Insensitive comment snipped
The metals do not need to be in direct contact.
Edit... There are small fragments of free floating metal always in solution. Over time these deposits are what contribute to corrosion. If steps aren't taken to neutralize the electrolyte I guarantee you'll see corrosion. Even if the metals aren't in "direct contact."
So what your saying here is the professional corrosion engineering company who's link I posted who are members of NACE (National Association of Corrosion Engineers ) which is the foremost world recognised body of experts on corrosion, don't know what the f*ck they are talking about?
Do a search on galvanic corrosion theory yourself and you will find the same information on many sites or get a book and read up on it.
I am an engineer by profession and I can say with absolute certainty that the metals do need to be in electrical contact for galvanic corrosion to occur.
As for bits of metal in solution, well unless your systems full of metal fillings this will not happen, neither copper or aluminium is soluble in water