Trying to figure out if this is one of those gimmicky gadgets that has no scientific base or whether it's the real deal,
They bolt onto a car (or perhaps a telescope left out in the weather ) and supposedly have some sort of a current that then provides extra electrons preventing rust..... I'm skeptical as if it worked everyone would have one.
I know we have plenty of science minded people who could clarify this.
Just google "anodic" or "cathodic" protection.
It works well in many situations, but i have
severe doubts it would be useful on a tripod
( unless it was supporting an oil rig )
Plus, sticking sacrificial anodes on the legs would
be a rather ugly solution relevant to a bit of WD40
Cathodic protection works well. Iron rusts as it loses electrons through oxidation when exposed to water and oxygen in the atmosphere. If you supply electrons in the form of a small current you will prevent the oxidation process and thus prevent rusting. It will work in many applications though some will be less elegant then others.
) and supposedly have some sort of a current that then provides extra electrons preventing rust..... I'm skeptical as if it worked everyone would have one. 
