what to use to stop corrosion between alum./steel ?

[rfuerst911sc]

I'm not talking screw threads this is on a truck camper. The camper has an anodized aluminum skin. The new lift system that I'm going to install has a steel top plate aprox. 12 " deep x 48 " wide. This top plate screws to the structure of the camper that has an aluminum skin. The steel plate is primed/painted but I want more protection to be safe. I'm thinking rubber maybe 1/16th or so thick sandwhiched between the two what do you think ? I'm not even sure where to find rubber like that ? Or is there a better solution ? Whatever I go with will be subject ( somewhat ) to weather/UV but the majority of it will not. Suggestions ?

[vash]

how about a bituminous coating? we spec it out on our jobs. same thing. alum sheets on stainless brackets.

[GH85Carrera]

Originally Posted by vash

how about a bituminous coating? we spec it out on our jobs. same thing. alum sheets on stainless brackets.

I want to see someone walk into any FLAPS or Ace hardware and ask for some bituminous coating.

That will get a puzzled look from the clerk. [img]http://forums.pelicanparts.com/support/smileys/draai.gif[/img

[vash]

Originally Posted by GH85Carrera

I want to see someone walk into any FLAPS or Ace hardware and ask for some bituminous coating.

That will get a puzzled look from the clerk. [img]http://forums.pelicanparts.com/support/smileys/draai.gif[/img

true.

okay..go in and ask for roofing tar.

[stomachmonkey]

https://www.google.com/search?q=bituminous+coating&oq=bituminous+coating&aqs=chrome..69i57&sourceid=chrome&ie=UTF-8

[Flieger]

Get that rubber in a spray can stuff they pitch on TV.

[island911]

Originally Posted by rfuerst911sc

...The steel plate is primed/painted but I want more protection to be safe. I'm thinking rubber maybe 1/16th or so thick sandwhiched between the two what do you think ? ...

I think that is MASSIVE overkill. Unless you are worried about the painted surface rubbing thru, just go with the paint and be done with it.


At 4' long, I would be more worried about the difference in thermal expansion rates (wear and/or internal stresses cycling)

[rsNINESOOPER]

Use a thin sheet of Lexan 1/32" or equivalent such as delrin etc. Or a thin sheet of rubber and just make gaskets to go between the two surfaces.
The lift will rub through the paint in less time than you think.

FYI- you can buy sheets of gasket rubber at most auto parts stores. Lexan at most large hardware stores and definitely hobby stores or TAP Plastics.

[porwolf]

The only thing that prevents corrosion between steel screws and aluminum is complete electrical insulation between. A pracrical way to accomplish that are plastic "shoulder washers" :

https://www.google.com/#q=shoulder+washers

[red-beard]

Originally Posted by GH85Carrera

I want to see someone walk into any FLAPS or Ace hardware and ask for some bituminous coating.

That will get a puzzled look from the clerk. [img]http://forums.pelicanparts.com/support/smileys/draai.gif[/img

I want a Plasma Rifle in the 30 Watt range...

[911pcars]

How about Por 15 + a low-friction physical barrier between the two metals?

Sherwood

[red-beard]

Originally Posted by porwolf

The only thing that prevents corrosion between steel screws and aluminum is complete electrical insulation between. A pracrical way to accomplish that are plastic "shoulder washers" :

https://www.google.com/#q=shoulder+washers

^^^This is correct. We use these on the Heliports.

[Evans, Marv]

Spray on bed liner???