I'm going to be building some gabions for a small root cellar. I've got lots of galvanized fence wire, which should be slow to rust and has small gaps to keep the stone in, but it is probably too weak for long term use. I also have lots of concrete reinforcing wire, which is plenty strong enough, but rusts and has large holes. So I was thinking of combining the two materials. However, I then started wondering about anode reactions. Would the zinc galvanization act as an anode, keeping the bare steel from rusting? How fast would this destroy the galvanization? Would I just end up losing both layers?
In my experience, it does not last all that long when the fence is touching soil. I think it is because it is such a light coating...and yes I buy expensive fence. In fact I do everything possible to keep that bottom wire from touching the ground where it will rot out, and that wire is 9 gauge, high tensile wire.
I think you would be better off to go to a maritime store (or order online) sacrificial anodes. they are very cheap. I have festoned many a hull with them. Just wash your hands afterwards, the zinc is a heavy metal and I am forever contaminated with the toxin when I worked with it a lot as a welder and never washed my hands.
When it is used for evil, then watch out! When it is used for good, then things are much nicer. Like this tiny ad: