Best approach to prevent galvanic corrosion? - Defender Source
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  #1  
Old November 25th, 2008, 09:37 AM
ajh
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Andrew J. Hutton
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Best approach to prevent galvanic corrosion?

Does anyone know which Aluminum Alloy has been used for the Defender body skin? I'm looking at the galvanic chart and Aluminum seems to be between .75 and .90 with the next closest material that seems suitable for plating the mild-steel parts seems to be Chromium at .60 which I figure could also be used to plate stainless steel parts as well to bring their galvanic potential closer to that of the Aluminum.

Does anyone have any specific advice on keeping things from turning to white dust over the years beyond the common sense of keeping things clean and dry, using aluminum fasteners when possible, using cad-plated bolts, and putting nylon washers between steel and aluminum parts when re-assembling things, as well as the obvious of keeping the waxoyl up to date (something the PO neglected to even get done, it's a good thing they don't use much road-salt in Oxfordshire, but we do use substantial amounts here in Canada).
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  #2  
Old November 25th, 2008, 09:47 AM
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evilfij
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I don't know but galvanized steel is not galvanically active with the alum in rovers.
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  #3  
Old November 25th, 2008, 12:06 PM
ajh
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Andrew J. Hutton
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Thanks, that helps a lot. Zinc it is then.

Has anyone tried the Cadwell zinc plating kit? They have a pre-treatment that will even let you plate aluminum, sounds like one possible option. I do fully intend to swap in a galvanized chassis as well, and hot-dip the parts as they come in for replacement /off for restoration.
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  #4  
Old November 25th, 2008, 09:05 PM
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Tom Rowe
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Galvanized. That's why Series rovers used galvanized fasteners where they came in to contact with the Birmabright.
Zinc plated fasteners don't last in my experience.
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  #5  
Old November 25th, 2008, 09:20 PM
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Arthur Maravelis
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I use Corrosion-X. Look it up, buy it, spray it everywhere.
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  #6  
Old March 18th, 2012, 12:20 AM
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Carl Jonsson
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Bringing this thread back. I have a fair amount of galvanic corrosion on my door skins. As I am planning to repaint the truck what measures can be taken in order to prevent galvanic corrosion in the future? What kind of precautionary measures can and should be taken?
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  #7  
Old March 18th, 2012, 08:21 AM
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Tom Rowe
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Strip the skins off and galvanize the steel structural parts of the doors.
Use Armor Coat fasteners.
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  #8  
Old March 18th, 2012, 09:47 AM
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Mike
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It is all about isolation. Dis-similar metals will react with each other. Just go to any Boat forum and you can find a world of information on Galvanic action. On one of the re-builds I found a lot of aluminum rot in the brackets that hold the mid bulkhead. These steel brackets were connected to the steel frame that intern were connected to the aluminum bulkhead. The aluminum was in horrible shape. If you isolate the different metals you will stop or at least slow down the problem.
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  #9  
Old April 7th, 2012, 02:06 PM
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Lilya Vorobey
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Hi Guys,
LANACOTE is a marine grade rust and corrosioin inhibitor - to the point where absolutely no air or moisture gets into what ever you have put it on. The one draw back with this stuff is that it is sticky and dogs love it....

I use it on my sailboat and the rover. Just keep it away from the other rover and wear gloves otherwise you will be trying to wash it off for days.
Any boat place should have it, about $10 for a small jar that will last a very long time.
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