captainwireman
Senior Member
- Location
- USA, mostly.
Situation:
A four inch round aluminum traffic rail supported by stout thirty inch high aluminum stancions on a hydro-electric facility. The rail sections are to be bonded, every other stancion.
My concern is the use of bronze nuts and bolts for mounting the bonding wire to the stancion. The stancion was drilled out for the mounting bolts. I see the stancion being a big anode and the cathode being the bronze. Somewhere I recall some kind of elevated decay because of, in this case, there will be small scratches making contact at the bolt/stancion surface where the now occurring aluminum oxide is. For a reason I don't know, the article I read said this was an ideal condition for galvanic action if a conductive environment is present.
My assessment is the bronze bolts, being a higher noble, will eat away at the aluminum stancion.
Is this a legitimate concern?
A four inch round aluminum traffic rail supported by stout thirty inch high aluminum stancions on a hydro-electric facility. The rail sections are to be bonded, every other stancion.
My concern is the use of bronze nuts and bolts for mounting the bonding wire to the stancion. The stancion was drilled out for the mounting bolts. I see the stancion being a big anode and the cathode being the bronze. Somewhere I recall some kind of elevated decay because of, in this case, there will be small scratches making contact at the bolt/stancion surface where the now occurring aluminum oxide is. For a reason I don't know, the article I read said this was an ideal condition for galvanic action if a conductive environment is present.
My assessment is the bronze bolts, being a higher noble, will eat away at the aluminum stancion.
Is this a legitimate concern?