From: whit3rd@gmail.com   
      
   On Tuesday, February 27, 2018 at 1:25:16 PM UTC-8, malua mada! wrote:   
   > I need to bleed static out of a moving aluminum structure. I have a springy   
   aluminum tongue (flashing) wiping on an aluminum arm (flat stock 1").   
   > Continuity is good to start with but after a year or so fails.   
      
   Aluminum oxide is hard, and makes a good abrasive.   That's not good for   
   sliding   
   aluminum-on-aluminum.   Copper is troublesome, because it enhances aluminum   
   corrosion.   
   You can clean and abrade, then apply aluminum solder (a zinc alloy) which in   
   turn will solder-join to many alloys.   Rivets also might work (but interfere   
   with the structure).   If it's only for static, you might get away with a   
   galvanized   
   chain (also amenable to the same zinc-alloy solder).   
      
   Or, you could weld a boss onto the structure, with   
   a tapped hole, and (using suitable paste) make a bolt-on electrical joint   
      
   --- SoupGate-Win32 v1.05   
    * Origin: you cannot sedate... all the things you hate (1:229/2)