By Jeff on Thursday, June 14, 2001 - 02:02 pm: Edit

I am fabricating an aluminum skid plate for my gas tank. I noticed that the mounting hardware on the RockWare skidplate is galvanized steel.

Will galvanize steel not react with the aluminum the way raw steel and aluminum react?

If not, what can be used to prevent contact of the mounting brackets and aluminum?

By Ron on Thursday, June 14, 2001 - 02:28 pm: Edit

Use silicon. If it is something that is supposed to stay together I use Black Death (weatherstrip adhesive) If not I use foam gaskets or rubber gaskets or just regular silicone, which works really well on the bolts.

Ron

By Chris Merritt (Smokinbro) on Thursday, June 14, 2001 - 03:07 pm: Edit

We fabricate equipment for use in aggressive areas (sewage treatment plants) and typically paint the bolts and contact points with an oil base or epoxy base paint. Used for everything from stainless steel / galvanized steel / mild steel and aluminum.

All you really need to do is prevent to the two metals from becoming electrically connected. No connection, no galvanic corrosion.

By T Carr on Thursday, June 14, 2001 - 07:39 pm: Edit

Not much galvanic action between zinc and aluminum.

Galvanizing is a zinc coating. AZINTLC.

Aluminum
Zinc
Iron
Nickel
Tin
Lead
Copper

The farther apart in the list, the greater the electrical activity. Adjacent metals have almost no reaction.

Aluminum touching copper is the worst.

By Chris Merritt (Smokinbro) on Friday, June 15, 2001 - 09:35 am: Edit

Its true that the the 'potentials' for zinc and aluminum are very similar.

In my opinion, however, a daub of paint or non-metalic washer would prevent it entirely