Sometimes I put red High Tack gasket sealer on the aluminum fitting before
putting the hose on.
Insulates them electrically, and it comes apart just fine later. 
There might even be  a dedicated product in the marine industry.
And then there's the Sacrificial Anode radiator cap, everybody knows about
those, right  ?
Scott
www.turbovans.com 

-----Original Message-----
From: Vanagon Mailing List [mailto:vanagon@gerry.vanagon.com] On Behalf Of
Zoltan Kuthy
Sent: Wednesday, November 28, 2007 3:39 PM
To: vanagon@GERRY.VANAGON.COM
Subject: Re: What is the scientific explanation?

Chad,
You were the only one who could answer it, so far anyway.
Now, the question is; what is the remedy?  What to do to stop it to happen?

Does it also mean that the rubber has some electrical conductivity?
Zoltan
  ----- Original Message ----- 
  From: Chad Lyles 
  To: Zoltan Kuthy 
  Cc: vanagon@gerry.vanagon.com 
  Sent: Wednesday, November 28, 2007 1:37 PM
  Subject: Re: What is the scientific explanation?

    this is a from of corrosion caused by a current flow generated between
two materials with greatly differing electrical potentials. Contrary to
popular belief, galvanism does not occur just between two different metals;
it can occur between other materials, such as carbon rubber and a metal.
Carbon rubber mated against aluminum, for example, is a disastrous
combination that will destroy aluminum very quickly. This is often found in
carbon rubber hose joined to aluminum or copper pipes and is often referred
to as electro-chemical degradation (ECD) 
   
  hope this helps answer the question. 
  Chad~

  On Nov 28, 2007 12:26 PM, Zoltan Kuthy <zolo@foxinternet.net > wrote:

    I have always wondered, why would there be extensive aluminum corrosion
built up under rubber hoses on aluminum parts or under the head gasket.  I
don't see any electrolysis activity going on under such insulating material.
I am baffled. 
    Anyone has an acceptable scientific explanation?  Or is it something
everyone knows except I.
    Zoltan

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