Re: [MV] Dissimilar metals ??

From: Jim Winne (jwinne@nettally.com)
Date: Sat Apr 20 2002 - 15:40:41 PDT


Hi Jarrett and group;

If you want to minimize the galvanic action between active metals you can
put a stainless washer between the two. This is done
when making a ground connection to something like a radio tower that is
zinc coated. The oxides don't build up nearly as badly
and the ground cable (copper) maintains a good conductive connection. The
worst combination has got to be brass and Aluminum.
They are guaranteed to corrode instantly.

To my knowlege, you can't weld steel and aluminum. However, they do put
aluminum coatings on steel (aluminized mufflers come
to mind). It is probably some chemical process like painting.

best of luck,
Jim (KB4IVH)
MVPA #17216

At 20:50 04/19/2002 -0700, Jarrett Redd wrote:
>Hi guys... What's the word on bolting dissimilar metals together? I know
>copper and steel don't like each other much. What about aluminum and
>steel? I
>have some steel brackets to bolt onto the aluminum body of my M998. Is this
>going to be a problem? They are both painted, but I don't want a
>galvanic/welding/oxidation response where the bolts pass through. Do I
>need to
>insulate the bolts? What about welding aluminum and steel? Other than
>being a
>bit tricky to balance the heat input, any longer term corrosion/etc effects?
>Thanks much...
>
>--
>Jarrett L. Redd
>'86 M998
>
>
>=====
>Jarrett L. Redd (K9HMV)
>
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