[amsat-bb] ground rod/plate bonding question

[Tyler Harpster]

Hello!

I am going to install a large brass plate at the cable entrance to my shack. 
I have a large ground rod outside the entrance where everything is going to 
be grounded.  I'm planning on using a large piece of copper strap to connect 
the plate to the rod.

Is there any substance I can use to clean/prep the copper and the brass?  Is 
there a material to use between the two metals to keep them from oxidizing 
and keep the bond in good condition?

Thanks

Tyler
KM3G