Smithin' folks don't like the looks of plated iron/steel anyhow, so don't even consider anything that looks shiny or that won't rust.
Use muriatic acid !!! I get it at Tractor Supply
You can cut it 50% or more depending on your preference. I even save used acid for a while since I use it a lot. Keep it in glass, preferably, or heavy poly. BUT, DON'T EVER STORE ANY LIQUID IN PLASTIC FOR THE LONG TERM.
George